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Look up anoxia, anoxic, or anoxically in Wiktionary, the free dictionary. Anoxia means a total depletion in the level of oxygen, an extreme form of hypoxia...

Anoxic waters are bodies or areas of sea water, fresh water or groundwater that are depleted of dissolved oxygen. Anoxic waters can be contrasted with...

An anoxic event describes a period wherein large expanses of Earth's oceans were depleted of dissolved oxygen (O2), creating toxic, euxinic (anoxic and...

Hypoxia is a condition in which the body or a region of the body is deprived of an adequate oxygen supply at the tissue level. Hypoxia may be classified...

(PTo-E). The second, larger pulse, the Toarcian Oceanic Anoxic Event (TOAE), was a global oceanic anoxic event, representing possibly the most extreme case...

Cenomanian–Turonian Oceanic Anoxic Event (OAE 2), and referred to also as the Bonarelli Event or Level, was an anoxic extinction event in the Cretaceous...

brine pools are toxic to marine animals due to their high salinity and anoxic properties, which can ultimately lead to toxic shock and possibly death...

syncope encountered mainly, but not exclusively, in young children. Reflex anoxic seizures are not epileptic seizures or epilepsy. This is usually a consequence...

result of oxygen deprivation either due to hypoxic or anoxic mechanisms is generally termed hypoxic/anoxic injury (HAI). Hypoxic ischemic encephalopathy (HIE)...

Anoxic depolarization is a progressive and uncontrollable depolarization of neurons during stroke or brain ischemia in which there is an inadequate supply...

waters, and the evolution of life. Newly evolved burrowing organisms exposed anoxic sediments to the overlying oxygenated seawater. This bioturbation decreased...

layer of deep water that does not drain or mix and is therefore anoxic. This anoxic layer is responsible for the preservation of ancient shipwrecks which...

Euxinia or euxinic conditions occur when water is both anoxic and sulfidic. This means that there is no oxygen (O2) and a raised level of free hydrogen...

have linked both extinctions to anoxic events, where seawater is deprived of oxygen on a global scale. These anoxic events may have been caused by a...

time in the anoxic conditions of what would become the Persian Gulf and the Gulf of Mexico. In many places around the world, dark anoxic shales were formed...

bloom – Spread of planktonic algae in water Anoxic event – Historic oxygen depletion events in Earth's oceans Anoxic waters – Areas of seawater, freshwater...

Urgonian Stage. The Selli Event, also known as OAE1a, was one of two oceanic anoxic events in the Cretaceous Period, which occurred around 120 Ma and lasted...

longest-lasting anoxic events in geologic time. The cause of the Hirnantian–Rhuddanian anoxic event is uncertain. Like most global anoxic events, an increased...

during oceanic anoxic events, including the Toarcian Oceanic Anoxic Event, the Mid-Cenomanian Event, and the Cenomanian-Turonian Oceanic Anoxic Event. It is...

stratified into two layers, an oxygenated upper layer (mixolimnion) and a lower anoxic layer (monimolimnion). The oxygen concentration in the lake declines from...

completely anoxic and, due to the activity of sulfate reducers, contains sulphide at a concentration of 2.9 mM. Despite such harsh conditions, this anoxic and...

below 3–4 cm. As depth increases in the lake, the water becomes completely anoxic. Movile Cave is chemically characterized by high concentrations of sulfide...

Sea date to antiquity. In 1976, Willard Bascom suggested that the deep, anoxic waters of the Black Sea might have preserved ships from antiquity since...

is an abundance of black shale, which forms in stable anoxic (oxygen-deprived) seawater. Anoxic conditions correlate better with biotic crises than phases...

global ocean, the Paratethys realm became stratified and turned into a giant anoxic sea. The western and central Paratethys basins experienced intense tectonic...

suggesting anoxic bottom mud under an oxygenated ocean. Studies of the Black Sea, which is considered a modern model for ancient anoxic ocean basins...

of methane (AOM) is a methane-consuming microbial process occurring in anoxic marine and freshwater sediments. AOM is known to occur among mesophiles...

time after the PETM's termination. The PETM generated the only oceanic anoxic event (OAE) of the Cenozoic. Oxygen depletion was achieved through a combination...

August 11, the representative said that Heche was not expected to survive an anoxic brain injury she had sustained, but that she was being kept on life support...

from Cambridge to Durham, led to the concept of the so-called ‘oceanic anoxic event’, an environmental phenomenon characterized by the global spread of...

single species Quasibodo laughtonii. The species was described in 2000 from anoxic marine and freshwater sediments. The genus has not yet been placed in any...

L'Atalante and its neighbors the Urania and Discovery deep hyper saline anoxic basins (DHABs) are at most 35,000 years old. They were formed by Messinian...

can also be produced by methanogens, archaea that produce methane under anoxic conditions, in a process known as methanogenesis. Methanogens generate Methanosarcina...

concentrations are approximately 0 milligrams per liter, conditions are anoxic. Both hypoxic and anoxic waters reduce available habitat for organisms that respire...

shallows around them. Their water circulation is poor, and they are commonly anoxic below a certain depth; this environment is unfavorable for most sea life...

The Selli Event, also known as OAE1a, was an oceanic anoxic event (OAE) of global scale that occurred during the start of the Aptian stage of the Early...

Bihospites, as well as other members of the symbiontids, are found in semi-anoxic to anoxic sediments in benthic marine environments. Each cell surface is covered...

decomposing organisms. The anoxic bottom of the Arctic basin, a result of the stratified water column, permitted just this; the anoxic environment inhibits...

(~500 gCm−2yr−1), causes the basin to be permanently anoxic, below ~250 m. This naturally occurring anoxic basin allows for sediments to be deposited without...

elegans is a species of marine ciliates. It has been isolated from the anoxic Mariager Fjord. Morphology, ultrastructure, molecular phylogeny, and autecology...

than one percent by mass in an average shale. Black shales, which form in anoxic conditions, contain reduced free carbon along with ferrous iron (Fe2+) and...

historical record extending back thousands of years, and because of the euxinic (anoxic, sulfidic) conditions which can form in the deep water. Green Lake has a...

Shale was deposited in anoxic conditions, but mounting research shows that oxygen was continually present in the sediment. The anoxic setting had been thought...

bacteria to a cumbersome situation where, due to their requirement for anoxic illuminated regions (near the surface), they could be faced with competition...

fixed nitrogen removal in the anoxic zones of the open ocean. Anammox requires a source of ammonium, which under anoxic conditions could be supplied by...

the Aalenian. The Toarcian Age began with the Toarcian Oceanic Anoxic Event, a major anoxic event associated with marine extinctions and increased global...

water contains lime, soda, magnesia and iron, and because the Blue Hole is anoxic, it cannot naturally sustain fish. The surrounding terrain is developed...

methane is an important and widespread form of microbial metabolism. In anoxic environments, it is the final step in the decomposition of biomass. Methanogenesis...

but based on drillholes in Svalbard the defining early Aptian Oceanic Anoxic Event 1a (OAE1a) was dated to 123.1±0.3 Ma, limiting the possible range...

paper published in 1998 in Nature, Canfield argued that the deep ocean was anoxic and sulfidic (also known as euxinic) during the time of the Boring Billion...

prefer stagnant water. Some species of turtles, such as the mata mata. Anoxic waters Eutrophication (excessive enrichment by nutrients and minerals) Slough...

in Greece. Evidence linking foraminiferal extinctions during the Oceanic Anoxic Event 1b to ocean acidification is presented by Chen et al. (2026). Lowery...

Burrishoole Estuary. The lagoonal estuary is notable for the perennially anoxic deep water in the main inner basin. Tidal currents transport salty, dense...

sand and mud beneath shallow coastal waters and can survive in relatively anoxic environments. They were first recognised and described in 1956. Most gnathostomulids...

being anoxic. The anoxic environment results from poorly drained areas, resulting in high microbial activity due to low oxygen availability. The anoxic settings...

dating back to the Jurassic period. It was deposited in a "oxic to anoxic (or anoxic-hypersaline), shallow marine environment" The lithology predominantly...

widely present biomarker that is often found in anoxic settings. It has been identified in anoxically deposited lacustrine sediments (such as the Messel...

being induced by flood basalt volcanism. It is associated with an oceanic anoxic event (OAE). The FTX is associated with a pulse of large igneous province...

upper and lower layers do not mix, resulting in an anoxic environment below the chemocline. This anoxic environment with light and sufficient sulfide availability...

2002). "Oceanic anoxic events and plankton evolution: Biotic response to tectonic forcing during the mid-Cretaceous: OCEANIC ANOXIC EVENTS AND PLANKTON...

The Breistroffer Event (OAE1d) was an oceanic anoxic event (OAE) that occurred during the Middle Cretaceous period, specifically in the latest Albian,...

reversible as well, allowing cellular ATP levels to be maintained during anoxic conditions. This process in animals is seen to be coupled with metabolic...

waters of the lakes within the rift system are likely to have been cold and anoxic (oxygen depleted), which helped to preserve animal remains by slowing decay...

anoxic conditions to see if there was a difference in activity level and tolerance to anoxia. These studies found that nitrate reductase, in anoxic conditions...

from carbon dioxide reduction with H2. Any oxygen that would reach the anoxic zone would likely abiotically oxidize Fe(II), rather than methane. It is...

faced with a different set of problems. Since ATP was used up during the anoxic period, it leads to a lack of ADP within the system. This is due to ADP's...

Toarcian Age started around 183 Ma and is marked by the Toarcian Oceanic Anoxic Event, a global episode of oceanic anoxia, ocean acidification, and elevated...

% in weight. The term sapropel events may also refer to cyclic oceanic anoxic events (OAE), in particular those affecting the Mediterranean Sea with a...

and the Rocky Mountains to the east and north. The Lagerstätten formed in anoxic conditions in the fine carbonate muds that formed in the lakebeds. Lack...

of the East Coast of the United States. At the end of the Cenomanian, an anoxic event took place, called the Cenomanian-Turonian boundary event or the "Bonarelli...

puzzling observation is the coexistence of ferrous and sulfate ions under anoxic conditions. No sulfide anions are found in the system. This suggests an...

and is common in wetlands, where it tolerates submersion, low pH, and anoxic soils. The plant spreads quickly, by both rhizome and water-dispersed seed...

"Anoxic Brain Injury". BrainAndSpinalCord.org. Retrieved 23 November 2016. Anoxic brain injury which is also called cerebral hypoxia or hypoxic-anoxic...

turbatio, described in 2007, and another species, native to completely anoxic environment, Spinoloricus cinziae, was described in 2014. Heiner, Iben (2007)...

of the Late Ediacaran ocean was comparable to that of Mesozoic oceanic anoxic events. The very low values of δ238U, commonly used as an isotopic measurement...

epithelial crypts as well as in the cecum. It specifically resides at the oxic-anoxic interface. A. muciniphila is found in about 90% of healthy humans, makes...

underlies the Coniacian Stage. At the beginning of the Turonian an oceanic anoxic event (OAE 2) took place, also referred to as the Cenomanian-Turonian boundary...

approximately 300 feet (91 m). The water at that depth and below becomes dark, anoxic and devoid of life. The submarine expedition also discovered the bodies...

However the abundance of iron-rich and organic sediments has led to an anoxic sub-seafloor well-suited for anaerobic, pyrite-producing bacteria. It was...

his death. His cause of death was later attributed to heart attack and anoxic-ischemic encephalopathy due to multiple drug intoxication involving fentanyl...

methanogens can be found in a wide range of environments, both oxic and anoxic and both terrestrial and aquatic, especially environments containing low...

gemmules, are capable of surviving in a seemingly inactive state during anoxic conditions for months to decades. Studies of the metabolic activity of these...

amount of acid mine drainage (minerals like pyrite which are stable in anoxic conditions oxidize if exposed to air, giving rise to sulfuric acid - this...

abiotic and biotic processes and may support aerobic metabolism in dark, anoxic environments. The theory for dark oxygen production by manganese nodules...

The Paquier Event (OAE1b) was an oceanic anoxic event (OAE) that occurred around 111 million years ago (Ma), in the Albian geologic stage, during a climatic...

known as hydrogen corrosion) is a form of metal corrosion occurring in anoxic water. Typically following aerobic corrosion, anaerobic corrosion involves...

It appears in people with dementia and schizophrenia, as well as after anoxic brain injury. In schizophrenia, it is called schizophasia. Clang associations...

Chemoclines most commonly occur where local conditions favor the formation of anoxic bottom water — deep water deficient in oxygen, where only anaerobic forms...

many single-cell organisms to use glycolysis as their only energy source. Anoxic regeneration of NAD+ is only an effective means of energy production during...

waters and anoxic bottom waters, with the anoxic waters forming in a layer 0.5 to 4 metres (2–13 ft) in thickness. The occurrence of the anoxic layer is...

"only fjord on the East Coast", it lacks the extreme vertical relief and anoxic sediments associated with Norwegian fjords, and is now called a fjard by...

Ironstones are relatively rare and are thought to have been deposited in marine anoxic events, in which the depositional basin became depleted in free oxygen....

radiosensitivity of free living cells and organisms in the presence of oxygen than in anoxic or hypoxic conditions, where the oxygen tension is less than 1% of atmospheric...

Grinker's myelinopathy, also known as anoxic leukoencephalopathy, is a rare disease of the central nervous system. The disease is characterized by a delayed...

"Cryogenian interglacial period" marked by relatively warm climate and anoxic oceans, along with marine transgression. Before the start of the Cryogenian...

the mini-basins in this area, in that it contains a large brine pool of anoxic salt brine. The pool is approximately 123 km2 (47 sq mi) in area and up...

Three Western Interior Seaway anoxic events occurred during the Cretaceous in the shallow inland seaway that divided North America in two island continents...

Donald Eugene (1988). Sulfate reduction and the diagenesis of iron in anoxic marine sediments (PhD thesis). Yale University. OCLC 40356769. Canfield...

factors may reduce observed percolation rates when the drain field receives anoxic septic tank effluent: Microbial colonies catabolizing soluble organic compounds...

subsequently reducing the likelihood or extent of harmful algal blooms or anoxic conditions. Filter feeding activity is considered beneficial to water quality...

nov. sp. (all of order Nanaloricida), were found in the sediment of the anoxic L'Atalante basin of the Mediterranean Sea. Electron microscope images show...

found to be directly linked to their ability to survive submerged in almost anoxic water. It has also been found to play a crucial role in the development...

Galperin, M. Y.; Koonin, E. V. (2012). "Origin of first cells at terrestrial, anoxic geothermal fields". Proc. Natl. Acad. Sci. USA. 109 (14): E821–30. Bibcode:2012PNAS...

and soils, ruminants (for example, cattle), the guts of termites, and the anoxic sediments below the seafloor and the bottom of lakes. This multistep process...

progressively becomes anoxic (there is no more oxygen available). In time, all oxygen-dependent life dies, and the lake becomes a smelly anoxic place where no...

photosynthetic eukaryotes, radically changed the composition of the early Earth's anoxic atmosphere, which as a result is now 21% oxygen. Animals and most other...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

layer of ocean water near the surface slowly deepened at the expense of the anoxic depths, but there did not seem to be any dramatic change in climate, biology...

eventual decay removing the dissolved oxygen from the water; thus hypoxic or anoxic zones can develop. Nitrogen is often the lead cause of eutrophication in...

recently discovered anaerobic species, which spend their entire lives in an anoxic environment. Microscopic images of microfauna Arachnid (Lorryia formosa)...

wastewater treatment technologies: Activated sludge model A2O (Anaerobic-Anoxic-Oxic) model Activated sludge systems Adsorption/Bio-oxidation process Advanced...

them up and forming the ridge. Along the ridge, five deep basins full of anoxic brine have been found (including the L'Atalante basin), where Messinian...

Massospondylus suffer through a drought brought on by the Toarcian Oceanic Anoxic Event, 183 million years ago. By 160 million years ago, dinosaur diversity...

(during unprotected unconscious state following head trauma) resulting in anoxic brain damage. She also showed injuries as a result of assault and rape....

lacking dissolved oxygen (0% saturation) is termed anaerobic, reducing, or anoxic. In water, oxygen levels are approximately 7 ppm or 0.0007% in good quality...

extinction rates that are thought to have been maintained by anoxic conditions. A decrease in the anoxic conditions of the Cambrian, and an increase in euxinic...

prosper. This also forced the surviving anaerobes to either live only in anoxic waters and deep sea oxygen minimum zones, or adapt a symbiotic life among...

liquefaciens strain ATCC 27592 exhibited growth at 7 mbar, 0 °C, and CO2-enriched anoxic atmospheres. On 10 September 2025 NASA announced that the Perseverance Rover...

are usually dependably anoxic. However, the conditions all across the salt marsh (above the sediment) are not completely anoxic, which means the organisms...

and possibly carcinogenic. Its high solubility and 50-year half-life in anoxic aquifers make it a perennial pollutant and health risk that is very expensive...

components and freshwater ecosystems General Acoustic ecology Algal bloom Anoxic waters Aquatic adaptation Aquatic animal Insect Mammal Water bird Aquatic...

(actually ferric hydroxide or hydrated iron oxide, also known as rust) forms by anoxic anodic pits and large cathodic surface, these pits concentrate anions such...

The Amadeus Event (OAE1c) was an oceanic anoxic event (OAE). It occurred 106 million years ago (Ma), during the Albian age of the Cretaceous period, in...

Mulder's observations were just consistent with Richard's suggestion. In their anoxic denitrifying pilot reactor, ammonium disappeared at the expense of nitrite...

ischemic stroke, with no significant reduction in case fatality at six months. Anoxic depolarization in the brain CADASIL Cerebrovascular disease Cerebral palsy...

(1985-08-01). "Sulfate-Reducing Bacteria: Principal Methylators of Mercury in Anoxic Estuarine Sediment". Applied and Environmental Microbiology. 50 (2): 498–502...

conditions become less optimal due to pH fluctuation, temperature variations, or anoxic water zones, the colony is capable of evacuating the zone. Horizontal displacement...

Ma). Around the Early–Middle Jurassic, after the global Toarcian Oceanic Anoxic Event there was a diversification of dinoflagellates and coccolithophores...

aquatic invertebrates, especially freshwater plankton. As a result, if anoxic conditions lead to the production of botulinum toxin and it gets passed...

School of Oceanography. In 1976, Willard Bascom suggested that the deep, anoxic waters of the Black Sea might have preserved ships from antiquity because...

Atribacterota is a phylum of bacteria, which are common in anoxic sediments rich in methane. They are distributed worldwide and in some cases abundant...

The Mid-Cenomanian Event (MCE) was an oceanic anoxic event that took place during the middle Cenomanian, as its name suggests, around 96.5 Ma. Approximately...

to a reduced rate of breathing which, if untreated and severe, can cause anoxic brain injury or death. Fentanyl stimulates MORs (mu-opioid receptors) in...

Sandblom, Eric; Richards, Jeffrey G.; Farrell, Anthony P. (2011-04-01). "Anoxic survival of the Pacific hagfish (Eptatretus stoutii)". Journal of Comparative...

As a result, over 90% of the deeper Black Sea volume is anoxic water. The Caspian Sea is anoxic below 100 m (330 ft). The Baltic Sea is persistently stratified...

billfishes. Fish with tolerance to anoxic conditions, such as jumbo squid and lanternfish, can remain active in anoxic environments at a reduced level,...

Facultative bacteria then reduce the nitrate to nitrogen gas in anoxic conditions (anoxic compartment). Moreover, the organisms used for the phosphorus...

important organic carbon turnover and nitrogen and sulfur cycling processes. Anoxic hydrothermal fluids contain several reduced compounds such as H2, CH4, and...

or underground stem is important in anchoring. The roots can live in an anoxic environment and depend on oxygen transport from the leaves and rhizomes...

career Fields Oceanography Institutions Florida State University Thesis Sulfur mass balance and isotopic fractionation in an anoxic marine sediment (1985)...

could be found buried beneath soft-sediment areas (fine sand, mud, often anoxic). This species is the origin of sea silk, which was made from the byssus...

our atmosphere. This process is also used with regular denitrification in anoxic layer of ponds. However, not all ponds have the ability to become sinks...

Algoma-type iron deposits can precipitate due to bacterial activity in an anoxic environment, as would be found in the very early Earth. These iron formations...

• Mountaintop removal mining • Slurry impoundments Water (depletion) — Anoxic waters • Aral Sea • California Water Wars • Dead Sea • Lake Chad • Water...

Tropical plants and dinosaurs on Antarctica and above Arctic Circle. Oceanic anoxic events (OAEs) result in widespread deposition of organic-rich black shales...

may enable the "storage of oxygen to provide a homeostatic mechanism in anoxic conditions, which is especially important for A9 DA neurons that have an...

a bacterium from the genus of Imhoffiella which has been isolated from anoxic sediments from Bheemli in India. "Imhoffiella". LPSN. "Imhoffiella bheemlica"...

"Electroencephalography (EEG) for Neurological Prognostication in Post-Anoxic Coma Following Cardiac Arrest and Its Relationship to Outcome". Brain Sciences...

physiological adaptations to their environment. For example, in entirely anoxic conditions during winter Carassius carassius can survive for considerable...

fossils. Petroleum is formed when algae and zooplankton die and sink in anoxic conditions to be buried on the ocean floor without being decomposed by aerobic...

wood tar produced by the high temperature carbonization of pine wood in anoxic conditions (dry distillation or destructive distillation). The wood is rapidly...

100 kyr period. Coal forms when organic matter builds up in waterlogged, anoxic swamps, known as peat mires, and is then buried, compressing the peat into...

this mass extinction has also been theorised to have been the result of an anoxic event. The relative proximity of the Moon at this time meant that tides...

spread in nature, but especially in aquatic environments, where there are anoxic conditions that favor the synthesis of their pigments. All purple bacteria...

shell allow it to tolerate high levels of lactic acid accumulation. In the anoxic conditions where fermentation is dominant, calcium levels in the blood plasma...

material dropped to the sea floor, and this is related to the global Oceanic Anoxic Event 2 (OAE2), or Cenomanian-Turonian boundary event, although the Texas...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

capacity to couple anaerobic methane oxidation with nitrite reduction in anoxic environments. To acquire oxygen for methane oxidation, M. oxyfera utilizes...

eruptions of OJP were thought to coincide with the global Early Aptian oceanic anoxic event (known as OAE1a or the Selli Event, 125.0–124.6 Ma) that led to the...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

nitrate at the sediment's surface to the oxidation of sulfide in the deeper, anoxic, sediment layers. Long-distance electrical conductance in sediment was first...

and dehydration of phytol (via dihydrophytol or phytene) under relatively anoxic conditions. However, various biotic and abiotic processes may control the...

finally disintegrates. Alternately, especially in very fine, dry, salty, anoxic, or mildly alkaline soils, bones may undergo fossilization, converting into...

event was accompanied by oceanic anoxia. However, unlike other oceanic anoxic events, the WTX is not associated with widespread black shale deposits....

other regions as an ornamental plant. It can tolerate the roots being in anoxic mud in nutritionally poor conditions, and can become a dominant plant in...

had low oxygen levels (with minor fluctuations), leading to widespread anoxic waters. More recent work has highlighted that the evidence for a large drop...

also the conversion of [2Fe–2S] FNR to [4Fe–4S] FNR is not known. Under anoxic conditions, the [4Fe-4S] FNR, bound to 4 cysteine residues binds to DNA...

terrestrial and marine ecosystems. Typically, denitrification occurs in anoxic environments, where the concentration of dissolved and freely available...

taken to Cedars-Sinai Medical Center where he fell into a coma. Due to an anoxic brain injury, his speech became slurred and his gait was altered. In May...

Fusicatenibacter saccharivorans is a species of anoxic, Gram-positive, non-motile bacteria that was first isolated from human faeces. It has a spindle...

Gaet'Ale Pond and Black Lakes. The hydrothermal springs of Dallol discharge anoxic, hyper-acidic (pH < 0), hyper-saline (almost 10 times more saline than seawater)...

continuous upwelling of water that mixed newly brought marine water with anoxic water from the basin floor. The makeup of the reef is described as being...

Gambi C; et al. (April 2010). "The first metazoa living in permanently anoxic conditions". BMC Biology. 8 (1): 30. doi:10.1186/1741-7007-8-30. PMC 2907586...

Southeast Asia. They exhibit a greenish-blue-grey soil color because of anoxic wetland conditions. On exposure, as the iron in the soil oxidizes colors...

not mix. The permanent stratification of Lake Malawi's water and the oxic-anoxic boundary are maintained by moderately small chemical and thermal gradients...

rhizosphere and rhizoplane. Root respiration and exudation can generate Anoxic microsites in soil adjacent to roots, shaping microbial community structure...

physical damage, disease (such as Huntington's disease) or a hypoxic or anoxic insult. Impulsivity Risk taking, lack of planning, and making up one's mind...

hatch as soon as they hit the water. The larvae can survive for months in anoxic conditions, an adaptation which is necessary to survive the winter in ponds...

within a sequence of limestone. In marine environments, this appears as an anoxic event, often forming potential hydrocarbon source rocks such as the Marcellus...

components and freshwater ecosystems General Acoustic ecology Algal bloom Anoxic waters Aquatic adaptation Aquatic animal Insect Mammal Water bird Aquatic...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

[citation needed] Goldfish are able to survive short periods of entirely anoxic conditions. Survival is shorter under higher temperatures, suggesting that...

sediments in continental margins, (3) anoxic or sulfidic sediments in basins or fjords with permanently anoxic or sulfidic (euxinic) bottom waters, and...

of Tasmania, Australia. The lake has a layer of fresh water overlying an anoxic salt water layer. The meromictic lakes and ponds of the Gordon River were...

which colonised the lake in the late 1990s". This invasive weed creates anoxic (total depletion of oxygen levels) conditions in the lake, inhibiting decomposing...

a drastic shift in anoxic conditions seen in both the Gulf of Mexico and the Baltic Sea. Some research suggests that when anoxic conditions arise from...

roots of H. vulgaris extend into the anoxic zone of wetland soils and create a conduit for methane produced in the anoxic zone to travel to the atmosphere...

between the evolution of land plants, weathering processes, and marine anoxic events". Philosophical Transactions of the Royal Society B: Biological Sciences...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

from other Polynucleobacter type strains due to its origin from a deep anoxic water layer. The genome sequence of the strain was fully determined., The...

maritime climate conditions there, notably because of their intolerance of anoxic conditions resulting from ponding on poorly drained soils in winter. Dutch...

Oremland, Ronald S. (June 1994). "Degradation of trifluoroacetate in oxic and anoxic sediments". Nature. 369 (6483): 729–731. Bibcode:1994Natur.369..729V. doi:10...

underground sources, which mineralize deep waters and make them denser. The anoxic waters of the lake bottom, between 60 and 92 meters, are confined and loaded...

pliosaurs, on the other hand, became extinct during the Cenomanian-Turonian anoxic event.[citation needed] Near the end of the Cretaceous Period, flowering...

and iron(III) oxide. Iron(II) oxide (FeO) only forms under low oxygen (anoxic) circumstances and gives the rock a grey or greenish colour. Iron(III) oxide...

deposited under strongly reducing conditions during the Toarcian oceanic anoxic event, trapped and exceptionally preserved complete fossils of marine fish...

municipal effluents: waste water bacteria transform DMSO under hypoxic (anoxic) conditions into dimethyl sulfide (DMS) that has a strong disagreeable odor...

time period, there is a shift from a terrestrial to a marine, potentially anoxic, sedimentary depositional environment, suggesting a sea level rise. After...

Spinoloricus cinziae, for example, a species discovered in the hypersaline anoxic L'Atalante basin at the bottom of the Mediterranean Sea in 2010, appears...

mechanical means, but no air is added yet. This stage is also called the anoxic stage. During the second stage, aeration of the mixed liquor is performed...

compounds, or whether the ferric compounds are reduced when exposed to anoxic conditions upon burial beneath the sediment surface and reoxidized upon...

oxygen, with some of the deeper water levels in the cave being completely anoxic. Despite these daunting conditions, the cave boasts very high levels of...

aeration is often required in water bodies that suffer from hypoxic or anoxic conditions, often caused by upstream human activities such as sewage discharges...

Bamberton, servicing a cement works. For most of the year the deep waters are anoxic, and hydrogen sulphide (H2S) is often detected near the bottom. In the late...

poisoning: Hydrogen sulfide is associated with sour natural gas, crude oil, anoxic water conditions and sewers (more information needed). hydrogen sulfide...

below 5% atmospheric saturation. It can also survive extended periods in anoxic water, where oxygen is absent. Under such conditions, Loxodes is able to...

(N). Phosphatic shale (< 15% P2O5) and phosphorite (> 15% P2O5) form in anoxic deep water basins that preserve organic material. Greenstone (metabasalt)...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

are known. Under anoxic conditions, methanotrophs use different electron acceptors for methane oxidation. This can happen in anoxic habitats such as marine...

components and freshwater ecosystems General Acoustic ecology Algal bloom Anoxic waters Aquatic adaptation Aquatic animal Insect Mammal Water bird Aquatic...

lake turnover allows mixing of oxic surface waters and anoxic bottom waters. Notably, anoxic conditions in temperate lakes have the potential to create...

Examples of applications where submersible mixers are commonly applied: Anoxic/anaerobic tanks and oxidation basins (activated sludge) at sewage treatment...

water. Such materials may give the water a cloudy or turbid appearance. The anoxic decomposition of some organic materials may give rise to obnoxious or unpleasant...

between the evolution of land plants, weathering processes, and marine anoxic events". Philosophical Transactions of the Royal Society B: Biological Sciences...

sediments implies a past euxinic environment, where water columns were anoxic and sulfidic. This is significant for reconstructing past oceanic conditions...

following either a spike in primary productivity, a drop in decomposition under anoxic ocean conditions or both. For example, the evolution of large land plants...

and live without oxygen, which is toxic to them, and they only inhabit anoxic environments. A shared trait by all methanogens is their ability to recycle...

The Mulde event was an anoxic event, and marked the second of three1 relatively minor mass extinctions (the Ireviken, Mulde, and Lau events) during the...

and environmental monitoring studies have documented nutrient loading and anoxic conditions in the lake. From the late 20th century into the 21st century...

of oxygen (anaerobic growth), it is capable of nitrate reduction under anoxic conditions. Therefore, nitrate tests are positive since nitrate is generally...

Ruminococcus bromii is an anoxic, Gram-positive, non-spore-forming bacterium found in the human gut. It has a coccus shape and is non-motile. It is considered...

carbonate platforms is coupled with the deposition of sediments typical of anoxic environments (black shales). Thanks to low deep-water oxygen levels, animal...

suffering any harm (but none survived a test of 30 minutes). During the anoxic period it loses consciousness, its heart rate drops from about 200 to 50...

Sea may account for their absence. The Black Sea's lower layers are also anoxic and contain high concentrations of sulphur compounds such as hydrogen sulphide...

algae, from which it receives oxygen, helping the host organism survive in anoxic environments. They are common in freshwater lakes, ponds, and streams. Tetrahymena...

OAE could refer to: Oceanic Anoxic event, in which the Earth's oceans become completely depleted of oxygen below the surface levels. Orchestra of the Age...

(restaurant), in Mexico City GABA tea, commonly used name for tea passed through anoxic fermentation Harold Gaba (1946–2009), American businessman Lester Gaba (1907–1987)...

acristate mitochondria (both features that may indicate a preference to a semi-anoxic habitat), putative primary endosymbionts, many orange pigmented extrusomes...

S.P. (2018). "The wider context of the Lower Jurassic Toarcian oceanic anoxic event in Yorkshire coastal outcrops, UK" (PDF). Proceedings of the Geologists'...

Rambergite is a manganese sulfide mineral with formula MnS. It has been found in anoxic marine sediments, rich in organic matter of the Gotland Deep, Baltic Sea...

C.; Kerrisk, C.B. & Nilsson, G.E. (2002). "The role of adenosine in the anoxic survival of the epaulette shark, Hemiscyllium ocellatum". Comparative Biochemistry...

by-products of decomposition and rapidly use up any available oxygen, creating an anoxic environment. In actively decomposing waste, the temperature rises and the...

Tournaisian. It is named after the Hangenberg Black Shale, a distinctive layer of anoxic sediment originally found along the northern edge of the Rhenish Massif...

dry soil, the waters become oxygen-depleted, rendering the water environs anoxic. Many natural fish kills can occur if there are no oxygenated water refuges...

Haloplasma Contractile, an Unusual Contractile Bacterium from a Deep-Sea Anoxic Brine Lake.” Journal of Bacteriology, vol. 193, no. 17, 2011, pp. 4551–4552...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

It is thought to have lived in anoxic waters at great depths, and therefore may have been better adapted for the anoxic event that may have occurred during...

zones including reefs, sandbars, seagrass meadows or within soft-bottom and anoxic mudflats, where salinity is slightly reduced. They are benthic detritivores...

between the evolution of land plants, weathering processes, and marine anoxic events". Philosophical Transactions of the Royal Society B: Biological Sciences...

places"). These formations may have resulted from carcass burial in an anoxic environment with minimal bacteria, thus slowing decomposition. Lagerstätten...

hydrothermal vents at the bottom of the ocean, in digestive tracts, as well as in anoxic soils or sediment in wetland ecosystems. In July 2019, a scientific study...

so that its intensity cannot threaten the body's homeostasis by causing anoxic damage to the heart muscle. The central governor limits exercise by reducing...

pace with the demand we’re already seeing on the shelf." Lenney has reflex anoxic seizures and has seizures at the sight or discussion of gore. He does not...

verrucomicrobiales lineage of bacterial descent isolated by dilution culture from anoxic rice paddy soil". Applied and Environmental Microbiology. 63 (4): 1382–1388...

most of the lake, there is a small sub-basin at the southern end that is anoxic, and its sediments may have a higher methane concentration than those of...

molecular oxygen infiltrating from the overlying water column, and rapid anoxic organic matter decomposition and organic acid generation by fermentation...

containing hydrazine synthase can be found in a variety of ecosystems with anoxic zones. Like many membrane bound metabolisms, the electrons produced in oxidizing...

typically black shale, sometimes with pyrite, indicating deposition in an anoxic environment. Bedded chert is most often found in association with turbidites...

2015-03-20. Smith N. "Anoxic Brain Damage". Third Age. Archived from the original on 2009-01-29. Retrieved 2018-12-07. Tuhrim S. "Anoxic Brain Injury". Mount...

follow. Less than 1 tablespoon can cause adverse effects such as seizures, anoxic brain trauma, vomiting, lactic acidosis, cardiac arrest, seizures, or coma...

organisms such as alvinocarid shrimp, they must track oxic (oxygen-rich) / anoxic (oxygen-poor) environments as they fluctuate in the environment.[citation...

Hospital, Philadelphia, Pennsylvania Parady La 46 Cambodia 2026-01-10 Suffered anoxic brain injury, post cardiac arrest, shock and multiple organ failures, attributed...

major disruption in global climate as well as global anoxia during Oceanic Anoxic Event 2 (OAE-2). The CTM was one of the most extreme disruptions of the...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

can also integrate biological nitrogen removal through the addition of an anoxic zone where nitrate is present due to the denitrification capabilities of...

Oceans portal Underwater diving portal Anoxic event – Historic oxygen depletion events in Earth's oceans Anoxic waters – Areas of seawater, freshwater...

in fetal development during the fetal stage, but they may still lead to anoxic encephalopathy. Industrial pollution can also lead to congenital defects...

residues from these extinction boundaries indicate that the oceans were anoxic (oxygen-depleted) and had species of shallow plankton that metabolized H2S...

extremely high methylmercury concentrations have been only in the lake's anoxic deep brine layer (monimolimnion) below a depth of 20 feet (6.1 m), but concentrations...

Collapse (~300 Mya) Permian–Triassic extinction event (251.9 Mya) Oceanic anoxic events (~120 Mya, 93 Mya, and others) Cretaceous–Paleogene extinction event...

lacked any persistent redoxcline, a water layer between oxygenated and anoxic layers with a strong redox gradient, which would become a feature in later...

humic substances, reversing the natural process of coal formation under anoxic and reducing conditions. This form of "mineral-derived fulvic acid" is widely...

known from a complete body fossil. The squid appears to have suffocated in anoxic bottom water while attempting to eat an extinct cutlassfish (Anenchelum)...

I, Kristensen RM (April 2010). "The first metazoa living in permanently anoxic conditions". BMC Biology. 8 30. doi:10.1186/1741-7007-8-30. PMC 2907586...

from penetrating the deeper layers and create the hypoxic (low oxygen) or anoxic (no oxygen) zones. This separation eventually influenced the lake's chemistry...

Artinskian the Phosphoria Formation represented a deep inland sea with an anoxic, muddy bottom. Based on the large number of Helicoprion specimens discovered...

Krijgsman, Wout (2023-03-31). "The dire straits of Paratethys: gateways to the anoxic giant of Eurasia". Geological Society, London, Special Publications. 523...

incorporated into the Helvetic nappes. At the same time sedimentation of anoxic clay took place in the deep-marine realms of the Piemont-Liguria and Valais...

concentration in anoxic water, similar to these encountered for other divalent species such as Ca2+ and Mg2+ . However, once anoxic ground water is pumped...

porphyria, phenylketonuria, muscular dystrophy, Guillain–Barré syndrome, reflex anoxic seizures and Savant syndrome. Fabry disease, Kleine–Levin syndrome and congenital...

water washing, manual cleaning, antifouling coatings, allowing waters to go anoxic, and desiccation used to dry fouling out so that it may slough off or become...

levels. This combined with sediment oxidation, cause for near or complete anoxic conditions in the deeper levels of the lake. This stratification is more...

sulfur-oxidizing activity links carbon and nitrogen cycling in suboxic or anoxic environments. Through their metabolic versatility and ecological distribution...

estate corporation, Verdance, have transformed the planet, Sask-E, from an anoxic wasteland into an oxygen-rich planet habitable by H. sapiens. Destry, a...

of years, cyanobacteria are thought to have converted the early Earth's anoxic, weakly reducing prebiotic atmosphere, into an oxidizing one with free gaseous...

an accessory mineral in shale, where it is formed by precipitation from anoxic seawater, and coal beds often contain significant pyrite. Notable deposits...

nature it is a source rock for Hydrocarbons, mostly Natural gas. Due to the anoxic environment necessary for the development of black shales, fossils are rare...

differing physiochemical conditions. There are also a few archaea living in the anoxic zone, that contribute to the methane pockets under 12 m below the surface...

expansion of marine anoxia during the Toarcian Oceanic Anoxic Event, interpreted as indicating that anoxic waters covered ~6 to 8% of the global seafloor during...

Lavik, G.; Stief, P. (2011). "Diatoms respire nitrate to survive dark and anoxic conditions". Proceedings of the National Academy of Sciences of the United...

that it relates to stress. Females have nonrespiratory air sacs containing anoxic air, and the waving pushes this air into her lungs. The resulting stress...

during a significant environmental upheaval known as the Toarcian Oceanic Anoxic Event, which altered ocean chemistry and made survival challenging. Yet...

community. "...trilobite occupied the exaerobic zone, at the boundary of anoxic and dysoxic bottom waters. E. kingii consistently occur in settings below...

(Anaerophaga thermohalophila). Anaerophaga thermohalophila has been isolated from anoxic sludge from Hannover in Germany. Parte, A.C. "Anaerophaga". LPSN. "Anaerophaga"...

environments also indicate that microbial iron cycling was active in early anoxic ecosystems. These ancient microbial communities may have contributed to...

≤ 1 mm, circular, opaque, and cream-coloured after 48 h at 37 °C under anoxic conditions. Growth occurs from 25–45 °C (optimum 37 °C) and tolerates up...

Societal collapse State collapse World War III Ecological Climate change Anoxic event Biodiversity loss Mass mortality event Cascade effect Cataclysmic...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

Coniacian, an anoxic event (OAE-3) occurred in the Atlantic Ocean, causing large scale deposition of black shales in the Atlantic domain. The anoxic event lasted...

"Redox-driven geochemical partitioning of metal(loid)s in the iron-rich anoxic sediments of a recently flooded lignite mine pit: Lake Medard, NW Czechia"...

fragments underlying fossilbearing strata. Oil shale, formed by the slow anoxic deposition of mud and dead vegetation on the lake bed, is the primary rock...

survived intact, although prolonged exposure to moisture, acidity and the anoxic burial environment caused its original pigment to fade, leaving predominantly...

impact, methane hydrate gasification, sea level fluctuations, and a major anoxic event. Either the proposed Wilkes Land crater in Antarctica or Bedout structure...

viability, and vertical distribution of zooplankton resting eggs from an anoxic basin: Evidence of an egg bank". Limnology and Oceanography. 39 (1): 154–158...

degradation by bacteria removes oxygen, potentially, generating anoxic conditions. This anoxic environment kills off aerobic organisms (e.g. fish and invertebrates)...

hypolimnion (lowest layer of water) which in some conditions can become anoxic (of low oxygen content) which may affect the lake ecology. Limnological...

discovered the well-preserved wreck at a 320 m depth, in the Black Sea's deep anoxic waters. The vessel's entire hull and cargo are intact, buried in sediments...

Switzerland, was in Middle Triassic times a lagoon behind reefs with an anoxic bottom layer, so there were no scavengers and little turbulence to disturb...

Anoxia, also known as the anoxic beetles, is a genus of dung beetles in the family Scarabaeidae. Species within this genus include: Anoxia Anoxia affinis...

components and freshwater ecosystems General Acoustic ecology Algal bloom Anoxic waters Aquatic adaptation Aquatic animal Insect Mammal Water bird Aquatic...

marine anoxia (oxygen depletion). Emeishan volcanic activity led to two anoxic events, the middle Capitanian OAE-C1 and the end-Capitanian OAE-C2. Volcanic...

components and freshwater ecosystems General Acoustic ecology Algal bloom Anoxic waters Aquatic adaptation Aquatic animal Insect Mammal Water bird Aquatic...

8 in), and is 70 meters (230 ft) beneath the surface of the Gulf. It is anoxic and contain quantities of hydrogen sulfide and methane. The brine pool known...

the atmospheric chemistry. The transition of Earth's atmosphere from an anoxic prebiotic reducing atmosphere high in methane and hydrogen sulfide to an...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

explain black shale deposition during Aptian and Cenomanian–Turonian Ocean Anoxic Events (OAEs) and the associated 15N isotopic signatures indicative of N2-fixation...

Nitrospira spp. Denitrification requires anoxic conditions to encourage the appropriate biological communities to form. Anoxic conditions refers to a situation...

accompanying perturbation in the δ13C record. It is suspected that several global anoxic events were responsible for the extinction. Mass extinctions are often followed...

less oxygenated (4.06). The sea itself lacks hypoxic (O₂ < 1.7 ml/L) or anoxic (O₂ < 0.02 ml/L) oxygen minimum zones. Sediments amass on the upper slope...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

Root rot is a condition in which anoxic conditions in the soil or potting media around the roots of a plant cause them to rot. This occurs due to excessive...

can be associated with raised intracranial pressure that occurs due to anoxic or ischemic changes in the brain. It can be found in: Birth asphyxia Status...

new characteristics of "Thorarchaeia" that live under sediment and with anoxic properties. The graduate students further proved that the archaea aided...

tablets, documents inscribed on wooden tablets and preserved by unusual anoxic conditions, are a rare corpus of army documents from the north-western part...

PVS was set in 1993 in the case of Tony Bland, who sustained catastrophic anoxic brain injury in the 1989 Hillsborough disaster. An application to the Court...

storm wave base,[clarification needed] yet were deposited in predominantly anoxic conditions. The fossils are located on the bedding planes, and are randomly...

Societal collapse State collapse World War III Ecological Climate change Anoxic event Biodiversity loss Mass mortality event Cascade effect Cataclysmic...

enhancing sediment deposition in areas where it is already occurring. The fine, anoxic sediments under mangroves act as sinks for a variety of heavy (trace) metals...

resulting in a preserved specimen known as a bog body. The generally cool and anoxic conditions in these environments limits the rate of microbial activity,...

teeth and gums, causing infection only when they can multiply freely in anoxic environments. An affected human often has recently had dental work, poor...

v t e Marine pollution Algal bloom Anoxic event Anoxic waters Aquatic toxicology Cultural eutrophication Cyanotoxin Dead zone Environmental impact of...

the Llandovery, the Stockdale Supergroup is marked by a number of oxic-anoxic transitions, with black shales corresponding to transgressions - these may...

mid-summer, algal blooms have contributed to making slow-flowing areas anoxic. The Regional Council has cited the algal blooms as the cause of death of...

organisms) shortly after deposition. Lamination therefore survives better under anoxic circumstances, or when the sedimentation rate was high and the sediment...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

electroconvulsive therapy, prefrontal lobotomy, and partial cerebral hypoxia (hypoxic-anoxic brain injury) be used to treat rage syndrome. A 1974 study on prefrontal...

Karine (2026-03-02). "Sulfur disproportionation occurs globally across anoxic habitats and has multiple mechanisms of independent evolutionary origin"...

supergroup Discoba. They are unicellular organisms that commonly inhabit anoxic, sulfide-rich and ammonium-rich marine habitats worldwide. Members of Stygiellidae...

plankton productivity from the Devonian-Carboniferous boundary resulted in anoxic events that left black shales in the basins of Laurentia. The subduction...

reptiles during the Jurassic, focusing on the impact of the Toarcian Oceanic Anoxic Event, and report evidence of diversification of thalattosuchian crocodylomorphs...

mat Animals burrowing just under mat     =Microbial mat Firm, layered, anoxic, sulphidic substrate Animals moving on / in surface of sea-floor Loose,...

due to the opening of glutamate-regulated ion channels. Ischemia causes anoxic cell depolarizations and it is this increase in membrane potential at the...

prevention. The waste water pre-conditioning is based on establishing an anoxic biology in the waste water system. In the presence of nitrate, the metabolism...

along an oxic/anoxic (oxygen/sulfide) interface, where they produce white patches. However, during dark acclimation, the mat became anoxic, so the Beggiatoa...

benthic sulfur bacteria in genera such as Beggiatoa and Thioploca inhabit anoxic sediments on continental shelves and obtain energy by oxidizing sulfide...

produce hydrogen sulfide gas. If enough hydrogen sulfide accumulates in an anoxic zone, the gas can rise into the atmosphere. Oxidizing gases in the atmosphere...

large area for an extended period of time, it can become hypoxic or even anoxic; these areas are commonly called dead zones. These dead zones can be the...

generated: Type I source rocks are formed from algal remains deposited under anoxic conditions in deep lakes: they tend to generate waxy crude oils when submitted...

atomic ratio < 0.15 Derived principally from lacustrine algae, deposited in anoxic lake sediments and rarely in marine environments Composed of alginite, amorphous...

dissolved O2 in the cathodic zones, pitting corrosion may also occur under anoxic, or reducing, conditions. Indeed, the very harmful reduced species of sulfur...

subsequently further subdivided into several more periods of oxygenation and anoxic events associated with geological and climate catastrophes, mass extinctions...

cream-colored to gray with concentric lines or patches. Individuals living in anoxic conditions may be black. The inside surface of the shell is often white...

"Brittlestar diversity at the dawn of the Jenkyns Event (early Toarcian Oceanic Anoxic Event): new microfossils from the Dudelange drill core, Luxembourg". Geological...

Because of oxygen's low solubility in water, the water quickly becomes anoxic towards the interface of the mud and water. Anaerobic phototrophs are still...

Nile filled depressions like the Fayum Depression to form a deep lake with anoxic bottom waters and reaching 20 metres (66 ft) above sea level, probably once...

remains to crack and crumble. When in the ground, the bones were isolated by anoxic moist clay that prevented this from happening, but when removed into the...

the morphology. It dwelled in a cold southern ocean basin with periods of anoxic water, alongside a low-diversity community mostly consisting of arthropods...

elongating and eyes increasing in size while moving dorsally over time. Due to anoxic conditions in aquatic ecosystems during the Famennian (see Paleoenvironment...

sliders, wood frogs, and bar-headed geese. The ability to survive hypoxic or anoxic conditions is not closely related to endotherm hibernation. Some animals...

adhesion structures such as pili. A unique group of Archaea that inhabit anoxic groundwater have similar structures called hami. Each hamus is a long tube...

by an explosion of firedamp. In some industries, the hazard may be from anoxic asphyxia, or a lack of oxygen, rather than poisoning by something toxic...

mat Animals burrowing just under mat     =Microbial mat Firm, layered, anoxic, sulphidic substrate Animals moving on / in surface of sea-floor Loose,...

L. (August 2000). "Synchrony between Early Jurassic extinction, oceanic anoxic event, and the Karoo-Ferrar flood basalt volcanism" (PDF). Geology. 28 (8):...

events like those described as the first two of the ten plagues of Egypt (anoxic die-off in the Nile, followed by many dead frogs) would have created ideal...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

ISBN 978-3-642-66719-0. S2CID 28067123.[page needed] Nixon, Scott; Roques, Patrick. "Anoxic Nutrient Regeneration and the Eutrophication of Estuarine Waters". Rhode...

oxygen near the seafloor leaving the deeper portions of the sediment column anoxic. However, in the South Pacific Gyre, the low levels of organic material...

during the anoxic events, but also argue that the existence of such shallow marine habitable zones was not restricted solely to the anoxic events, and...

maybe even recovering terrestrial deposits coeval with the Toarcian Oceanic Anoxic Event. This last age assignation also correlated the Toarcian Vulcanism...

lagoon with an oxic and brackish upper water layer and a deep sulphuric anoxic saline layer. At a depth of approximately 15 m (49 ft) the water shifts...

isorenieratene, that signify that these rocks were deposited in a marine basin with anoxic, sulphidic, and highly-stratified deep waters with colonies of green and...

black shales from many parts of the world have indicated that two oceanic anoxic events were particularly significant in terms of their impact on the chemistry...

that affects regions of the Eastern Pacific inhabited by P. capitata. The anoxic conditions created by this increased upwelling particularly threaten P....

is also loosely applied to any glauconitic sediment. Greensand forms in anoxic marine environments that are rich in organic detritus and low in sedimentary...

Extracting materials from saltwater Brinicle – Sea ice formation Brine pools – Anoxic pockets of high salinity on the ocean bottom Westphal, Gisbert; Kristen...

"Analyzing the mechanism of nitrous oxide production in aerobic phase of anoxic/aerobic sequential batch reactor from the perspective of key enzymes". Environmental...

usually toxic to life. Bacteria like Chrysiogenes arsenatis are found in anoxic arsenic-contaminated environments. Chrysiogenes arsenatis in LPSN; Freese...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

"Ultra-sensitive optical oxygen sensors for characterization of nearly anoxic systems". Nature Communications. 5 4460. Bibcode:2014NatCo...5.4460L. doi:10...

were deposited in a marine setting during the Hangenberg event, an oceanic anoxic event associated with the Late Devonian extinction. The black shales of...

(so the brainstem respiratory centre is not challenged by the ultimate, anoxic, drive stimulus). This test – the apnoea test – is dangerous, and may prove...

azide can be added to molten metallic sodium (E°red = −2.71 V) under strict anoxic conditions (e.g. in a special anaerobic glovebox with very low residual...

structures are found, many of them temples. Some Roman carpentry preserved in anoxic layers of clay at Romano-British villa sites demonstrate that sophisticated...

(pulmonary edema). Reduced perfusion to the brain can cause drowsiness, with anoxic brain injury causing coma and death. Low blood pressure due to decrease...

within a freshwater rift lake that formed in this basin early on, with anoxic bottom waters allowing for the fossilization of the fish skeletons. The...

Certain benthic foraminifera have been found to be capable of surviving anoxic conditions for over 24 hours, indicating that they are capable of selective...

event took place during the Cenomanian-Turonian boundary event, a marine anoxic event, after which just a single lineage survived, Platypterygius hercynicus...

stratification of the reservoir water, caused by upstream pollution and anoxic decomposition, which produced hydrogen sulfide gas. Concerns were expressed...

"Geochemistry of the Frasnian-Famennian boundary in Belgium: Mass extinction, anoxic oceans and microtektite layer, but not much iridium". The Cretaceous-Tertiary...

v t e Marine pollution Algal bloom Anoxic event Anoxic waters Aquatic toxicology Cultural eutrophication Cyanotoxin Dead zone Environmental impact of...

network that supplies the skin with oxygen when the animal is buried in anoxic mud, as well as a high tolerance for both hypoxia and anoxia, with a well-developed...

sections contain "fossil water". This also means it has no oxygen (it is anoxic) in the deeper parts, essentially limiting fish and other aerobic organisms...

levels were too low to sustain wildfires. During this time, fish inhabiting anoxic waters (very low in oxygen) would have been under evolutionary pressure...

non-neurological conditions, such as: Syncope (fainting), including Reflex anoxic seizures. Breath-holding spells. Sleep-related disorders, such as parasomnias...

amount of dissolved oxygen. Below the thermocline, the water is normally anoxic and from November to April the fish are found no deeper than 20 metres (66 ft)...

in which organic compounds could have formed. Under the solar energy the anoxic atmosphere containing carbon dioxide, ammonia, and water vapour gave rise...

destruction? Vrselja "focuses on understanding how brain cells react to anoxic injury following circulatory arrest, and how such cells can be structurally...

measurements identify the first cultivated euryarchaeon from a deep-sea anoxic brine lake as potential polysaccharide degrader". Environmental Microbiology...

chitinitropha is a bacterium from the genus Orenia which has been isolated from anoxic sediments from a hypersaline lake from the Kulunda Steppe. "Species: Orenia...

ciliates as a model group for studying the biodiversityand symbioses in anoxic environments (PDF) (Thesis). 2020. Wrede C, Dreier A, Kokoschka S, Hoppert...

in that its monimolimnion contains dissolved oxygen, in contrast to the anoxic basin waters typical of meromictic lakes. The pollen analysis revealed corn...

their inundated conditions, leading to low chroma horizons, mottling, and anoxic decay.[citation needed] They can develop hydric soils which are typical...

as Cupriavidus necator (formerly Ralstonia eutropha), often inhabit oxic-anoxic interfaces in nature to take advantage of the hydrogen produced by anaerobic...

strongly stratified, with a well-oxygenated upper layer (epilimnion) and an anoxic lower layer (hypolimnion), without oxygen and often high concentrations...

become ice-locked and spend their time in either hypoxic (low oxygen) or anoxic (no oxygen) regions of the pond or lake. Painted turtles essentially hold...

Higher-quality preservation would have been facilitated by a high level of anoxic groundwater or dense vegetation to protect the bones from the elements....

δ13C rises from +1.4‰ to +4.5‰, while δ18O increases from −5.6‰ to −5.0‰. Anoxic event Jeppsson, Lennart; Calner, Mikael (June 2002). "The Silurian Mulde...

developed on Earth. The rocks document lava flows, meteorite bombardment, anoxic oceans, and the early atmosphere of the planet. Human Rights, Liberation...

Support (PBLS) is a rescue procedure which has purpose of preventing the anoxic brain damage by promoting the return of spontaneous circulation and breathing...

immediately after the end of the mass extinction despite numerous relapses into anoxic conditions during the earliest Jurassic. In the Neuquén Basin, recovery...

heritable. Maladaptive levels of certain traits may be acquired as a result of anoxic or traumatic brain injury, neurodegenerative diseases such as Parkinson's...

and the introduction of freshwater runoff into brackish waters created anoxic conditions that killed many fish in Guadeloupe's mangrove habitats; fish...

and Danube, it is one of very few elms tolerant of prolonged waterlogged, anoxic ground conditions. The species is threatened by habitat destruction and...

Bacterial Shuttling of Microbial Sulfur and Sulfur Cycling Across Aquatic Oxic-Anoxic Interfaces". Journal of Geophysical Research: Biogeosciences. 125 (12)....

discharge a sulfide “sewage” effluent, particularly during the first few years. Anoxic limestone drains consist of a buried limestone gravel system that requires...

designed microclimate case. An argon atmosphere fills the case to give an anoxic environment. Prior to display, the entire map was the subject of a scientific...

Basin sediments show sediments of the area are correlated to the ocean anoxic event named the Paquier Event, spanning the late Aptian to early Albian...

photooxidation (via solar UV radiation) of some mineral species such as siderite in anoxic aqueous environments. This may have been an important process in the upper...

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treating landfill leachate. C. nitrativorans has the ability to perform anoxic-reduction of nitrate, nitrite, and nitrous oxide to nitrogen. "Genus: Comamonas"...

as iron oxide. The bands were produced at the tipping point between an anoxic and an oxygenated ocean. Since today's atmosphere is oxygen-rich (nearly...

are usually present in anoxic-ischemic brains, which occurs when there is a complete lack of blood flow to the brain. Anoxic-ischemic brains usually...

waste disposal in Switzerland and Canada. Anaerobic corrosion of steel Anoxic waters Iron hydroxides, and their rare mineral analogue in nature: amakinite...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

magnitude less than rivers. Methane production is also typically high in the anoxic sediments of floodplains, lakes, and reservoirs. Primary production is typically...

Blautia massiliensis is an anoxic, Gram-negative rod shaped bacterium first isolated from human feces in 2017. Cells are non-motile and non-spore forming...

Patterson, David J. (May 2000). "Some free-living flagellates (Protista) from anoxic habitats". Ophelia. 52 (2): 113–142. doi:10.1080/00785236.1999.10409422...

carbon sinks (thanks to the accumulation of recalcitrant sphagnum litter and anoxic conditions) to carbon sources under the influence of nitrogen deposition...

17–18 parts per thousand compared to 30 to 40 for the oceans. The deep, anoxic water of the Black Sea originates from warm, salty water of the Mediterranean...

hydrogen as one of the products. This type of metabolism mainly occurs in anoxic sites, such as lake sediments, deep-sea hydrothermal vents and the animal...

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Elizabeth, New Jersey was a 73-year-old retired machinist who suffered from anoxic encephalopathy, a form of brain damage, following successful thoracic surgery...

factors in karst formation. As oxygen-rich surface waters seep into deep anoxic karst systems, they bring oxygen, which reacts with sulfide present in the...

of dolomite formed in modern times. Sulfate-reducing bacteria living in anoxic conditions can precipitate dolomite suggesting that some past dolomite deposits...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

of the Southern Kerguelen Plateau 118–119 Ma contributed to the oceanic anoxic event 1. Around 83.5 Ma sea floor spreading between India and Antarctica...

abnormalities, suspected hemorrhage, ventriculomegaly or hydrocephalus and anoxic insults (periventricular leukomalacia). It can be performed through the...

footprints (Periods I–V). They are buried as much as 13 feet (4 m) deep in the anoxic waterlogged soil and are covered by the remains of later periods, which...

Chambers, G; Cottrell, JE; Kass, IS (1995). "The Importance of Sodium for Anoxic Damage in Rat Hippocompal Slices: Mechanisms of Protection by Lidocaine"...

Pulmonary edema may result from direct pulmonary toxicity, neurogenic/anoxic effects, or cardiovascular depression. Balance disorder is possible, with...

components and freshwater ecosystems General Acoustic ecology Algal bloom Anoxic waters Aquatic adaptation Aquatic animal Insect Mammal Water bird Aquatic...

Mangrullo Formation, are suggested to have lived in saline lagoons with anoxic bottom waters that had a relatively depauperate fauna dominated by mesosaurs...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

from the ocean to the atmosphere in the so-called oxygen minimum zones or anoxic marine zones, driven by microbial processes. Other products, that are typically...

bacterium from the genus Ilyobacter which has been isolated from marine anoxic sediments from Venice in Italy. Parte, A.C. "Ilyobacter". LPSN. "Ilyobacter...

selenides of general formula FeSe2 precipitated under reducing conditions in anoxic environments. They are a source of selenium in the Rocky Mountains where...

early in the Triassic, before the Late Smithian crisis (a widespread ocean anoxic event that may have allowed ichthyopterygians to dominate deeper waters...

Liu, J.; Michalski, J. R.; Tan, W.; He, H.; Ye, B.; Xiao, L. (2021). "Anoxic chemical weathering under a reducing greenhouse on early Mars". Nature Astronomy...

years or decades, or only seasonally. Flooding results in oxygen-poor (anoxic) processes taking place, especially in the soils. Wetlands form a transitional...

reclassification into several different phyla. Methanogens are common in various anoxic environments, such as marine and freshwater sediments, wetlands, the digestive...

species (Malonomonas rubra). Strains of Malonomonas have been isolated from anoxic sediments. the bacteria Malonomonas rubra bacteria metabolizes malonate...

between the evolution of land plants, weathering processes, and marine anoxic events". Philosophical Transactions of the Royal Society B: Biological Sciences...

However, the immediate causes of death listed on his death certificate are anoxic encephalopathy, ventricular fibrillation and Long QT Syndrome, and additionally...

Lake is highly unusual among meromictic lakes in that, in contrast to the anoxic basin waters typical of meromictic lakes, the bottom layer (or monimolimnion)...

sheep Latin ovis ovile, ovine oxy- sharp, pointed Greek ὀξύς (oxús) anoxia, anoxic, dioxide, hypoxia, monoxide, oxide, oxyanion, oxygen, oxyhalide, oxymoron...

ammonia-driven plankton already dissolved in the water. Some hobbyists also use "anoxic filtration", which relies on bacteria that live in low-oxygen environments...

decrease of peripheral vision and seeing "stars" or "flashing lights." Post-anoxic encephalopathy, psychosis, seizures, amnesia, cerebrovascular accident and...

accumulation of organic material presumably made the bottom of the basin anoxic or dysoxic, with low oxygen levels in the seawater. The only fossils of...

Slava S. (2012). "Class Cariacotrichea, a novel ciliate taxon from the anoxic Cariaco Basin, Venezuela". International Journal of Systematic and Evolutionary...

snail have both gills and lungs, making it possible for them to thrive in anoxic waters where they recycle the nutrients. To get oxygen they extend a long...

along with other enchodontoids, was associated with ocean currents and anoxic events. This would be in contrast to a later paper that would question this...

include the fact that the project would likely lead to the creation of anoxic waters due to lake stratification, the destruction of the lake's unique...

cyanobacteria's oxygenic photosynthesis – various forms of Archaea and anoxic bacteria become extinct in first great extinction event on Earth. Algoman...

can either give or receive electrons depending on its environment. On the anoxic early Earth, most sulfur was present in minerals such as pyrite (FeS2)....

"Tolumonas auensis gen. nov., sp. nov., a toluene-producing bacterium from anoxic sediments of a freshwater lake". Int. J. Syst. Bacteriol. 46 (1): 183–8...

significant depletion of oxygen in the ocean, and caused the Cenomanian-Turonian anoxic event. Although this event led to the extinction of as much as 27% of marine...

an Eocene lagerstätte in Messel, Germany. Preserved in oil shale in an anoxic lake bed, the skeleton is laterally crushed but articulated, preserving...

mudstones, shales and nodules of sandstones and limestones, deposited in an anoxic environment, in the warm and shallow sea that covered large parts of the...

deserts", which are mostly at the centers of gyres, but also hypoxic or anoxic waters such as dead zones. Deserts usually have a large diurnal and seasonal...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

supports the traditional view that the seabed of the basin was completely anoxic – stagnant, oxygen-deprived, and lifeless. However, abundant fossils of...

treatment of strokes. Later, it was revealed that Paul's cause of death was "anoxic encephalopathy due to combined drug (opiate/benzodiazepine) toxicity"; a...

the Permian–Triassic extinction event (250 million years ago) a severe anoxic event seems to have occurred where these forms of bacteria became the dominant...

rock weathering and nutrient run-offs which may have triggered algal bloom anoxic events. Bilateria, animals having a left and a right side that are mirror...

peritidal environment. The benthic area of the region was most likely anoxic, and in combination with oceanic currents, helped to preserve the organisms...

from 1 mmol C m−2 d−1 to 2.5 mmol C m−2 d−1. Large aggregates can become anoxic which gives rise to anaerobic metabolisms. Typically anaerobic metabolisms...

The lack of oxygen to his brain during this time of hypotension caused anoxic encephalopathy. The fact that a brain complication had occurred was announced...

However, its presence has since been proposed and observed in natural anoxic environments – including marine sediments and anaerobic ocean waters Though...

Cabrol et al: Anaerobic oxidation of methane and associated microbiome in anoxic water of Northwestern Siberian lakes. In: Science of the Total Environment...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

periodically exposed mudflats at a low water stand of a lagoon. The sediment was anoxic just under the surface. The most abundant crustacean at the Granton Shrimp...

(Trachemys scripta) acclimated to either 22 or 5 degrees C. – I. Effects of anoxic exposure on in vivo cardiac performance". The Journal of Experimental Biology...

sulfide concretions were created by the precipitation of iron sulfides within anoxic marine calcareous ooze after it had accumulated and before it had lithified...

siltstone. Black alum shales deposited in the mid-Cambrian in a nearly anoxic epeiric basin with limestone layers, rich in trilobite fossils. Condensed...

or high salinity (halophiles). Some archaeans are methanogens, living in anoxic environments and releasing methane. Many archaea grow as plankton in the...

Karine (2026-03-02). "Sulfur disproportionation occurs globally across anoxic habitats and has multiple mechanisms of independent evolutionary origin"...

which have a high pe, while arsenites are the main arsenic species in anoxic waters with a low pe. A Pourbaix diagram shows the combined influence of...

formed around objects from the shallow reef areas which sank into the deep anoxic basins. The concretions sometimes contain the remains of fish, whose bodies...

Dusty Rose Lake is an anoxic lake located in north region of Tweedsmuir Park in British Columbia, Canada. It gets its name from its pink coloring. The...

motile bacterium from the genus Steroidobacter which has been isolated from anoxic sewage sludge from Soers in Germany. Steroidobacter denitrificans has the...

Andreas; Frenzel, Peter; Cypionka, Heribert (2000). "Life at the oxic–anoxic interface: Microbial activities and adaptations". FEMS Microbiology Reviews...

branching tubular cristae. However, among the Archamoebae, which are adapted to anoxic or microaerophilic habitats, mitochondria have been lost. It appears (based...

the cell, the organism uses it as storage of elemental sulfur in usually anoxic conditions to reduce the toxicity of various sulfur compounds (can also...

Tanner, RS (November 2011). "Tolumonas osonensis sp. nov., isolated from anoxic freshwater sediment, and emended description of the genus Tolumonas". Int...

lacustrine or brackish in order to be preserved. Without protection in anoxic sediments, amber would gradually disintegrate; it is never found buried...

input of nutrients into the ocean. The altering of soil composition created anoxic sedimentation (or black shales), oceanic acidification, and global climate...

clear why the Heslington brain survived, although the presence of a wet, anoxic environment underground seems to have been an essential factor, and research...

Santonian Villeta/Güagüaquí 86 Coniacian 89 Turonian Cenomanian-Turonian anoxic event La Luna Chipaque Gachetá hiatus Restricted marine (all) 500 m (1,600 ft)...

limited environments, methanogenic environments and anaerobic systems. In anoxic or methanogenic environments such as wetlands, swamps, paddy fields, landfills...

2022 2023 2024 2025 2026 Effects and issues Physical Abrupt climate change Anoxic event Arctic methane emissions Arctic sea ice decline Atlantic meridional...

mixture of carbon dioxide and nitrogen in a mine can cause suffocation. The anoxic condition results of depletion of oxygen in enclosed spaces, e.g. by corrosion...

ecosystems. In the Middle to Late Ordovician, after GOBE, an expansion of anoxic waters occurred in sync with a ~50% decline in benthic invertebrates in...

tissues. Konservat-Lagerstätten may have resulted from carcass burial in an anoxic environment with minimal bacteria, thus delaying the decomposition of both...

blood cells and buffy coat lysates stored at ambient temperature under anoxic and anhydrous atmosphere". PLOS ONE. 12 (11) e0188547. Bibcode:2017PLoSO...

siliceous shales of the Bazhenov Formation were deposited during this time in anoxic conditions on the sea bottom. Rocks of this formation have generated more...

was obvious. The first person to succumb failed to accurately discern an anoxic environment at the bottom of a sump within a sampling shed, accessed by...

from upper lake layers supersaturated in oxygen to bottom layers that are anoxic and sulfur-rich. Despite their typically oligotrophic conditions, subglacial...

Estimulación Cardíaca y Electrofisiología), STARS (Syncope Trust and Reflex Anoxic Seizures), StopAfib, and the World Society of Arrhythmias (WSA). The workshop's...