Share to: share facebook share twitter share wa share telegram print page

Dichloroacetic acid

Dichloroacetic acid
Names
Preferred IUPAC name
Dichloroacetic acid
Other names
Dichloroethanoic acid, bichloroacetic acid, DCA, BCA, dichloracetic acid, bichloracetic acid
Identifiers
3D model (JSmol)
1098596
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.001.098 Edit this at Wikidata
EC Number
  • 201-207-0
2477
KEGG
MeSH Dichloroacetate
RTECS number
  • AG6125000
UNII
UN number 1764
  • InChI=1S/C2H2Cl2O2/c3-1(4)2(5)6/h1H,(H,5,6) checkY
    Key: JXTHNDFMNIQAHM-UHFFFAOYSA-N checkY
  • InChI=1/C2H2Cl2O2/c3-1(4)2(5)6/h1H,(H,5,6)
    Key: JXTHNDFMNIQAHM-UHFFFAOYAK
  • ClC(Cl)C(O)=O
Properties
C2H2Cl2O2
Molar mass 128.94 g·mol−1
Appearance Colorless liquid
Density 1.5634 g/cm3 (20 °C)
Melting point 9 to 11 °C (48 to 52 °F; 282 to 284 K)
Boiling point 194 °C (381 °F; 467 K)
miscible
Solubility miscible with ethanol, diethyl ether[1]
Acidity (pKa) 1.35[1]
-58.2·10−6 cm3/mol
Thermochemistry
−496.3 kJ·mol−1[1]
Hazards
GHS labelling:
GHS05: CorrosiveGHS09: Environmental hazard
Warning
H314, H400
P260, P264, P273, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P391, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3
1
0
Safety data sheet (SDS) MSDS (jtbaker)
Related compounds
Chloroacetic acid
Trichloroacetic acid
Related compounds
Acetic acid
Difluoroacetic acid
Dibromoacetic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Dichloroacetic acid (DCA), sometimes called bichloroacetic acid (BCA), is the organic compound with formula CHCl2CO2H. It is an analogue of acetic acid, in which 2 of the 3 hydrogen atoms of the methyl group have been replaced by chlorine atoms. Like the other chloroacetic acids, it has various practical applications. The salts and esters of dichloroacetic acid are called dichloroacetates.

Reactions

The chemistry of dichloroacetic acid is typical for halogenated organic acids. It is an alkylating agent. It forms esters.

It is a member of the chloroacetic acids family. As such it is more acidic than acetic acid. It fully dissociates into dichloroacetate when dissolved in water, consistent with it pKa of 1.35,[1] pure dichloroacetic acid is classed as a strong organic acid; it is very corrosive and extremely destructive to tissues of the mucous membranes and upper respiratory tract via inhalation.[2]

Natural occurrence

DCA has been shown to occur in nature in at least one seaweed, Asparagopsis taxiformis [3] and also in the mushroom Russula nigricans.[4] It is a trace product of the chlorination of drinking water and is produced by the metabolism of various chlorine-containing drugs or chemicals.[5] DCA is typically prepared by the reduction of trichloroacetic acid (TCA).[6] DCA is prepared from chloral hydrate also by the reaction with calcium carbonate and sodium cyanide in water followed by acidifying with hydrochloric acid.[7]

As a laboratory reagent, both DCA and TCA[8] are used as precipitants to prompt macromolecules such as proteins to precipitate out of solution.[9]

Therapeutic uses

Salts of DCA have been studied as potential drugs because they inhibit the enzyme pyruvate dehydrogenase kinase.[10] Although preliminary studies found that DCA can slow the growth of certain tumors in animal studies and in vitro studies, as of 2012 insufficient evidence supported the use of DCA for cancer treatment.[11]

Lactic acidosis

A randomized controlled trial in children with congenital lactic acidosis found that while DCA was well tolerated, it was ineffective in improving clinical outcomes.[12] A separate trial of DCA in children with MELAS (a syndrome of inadequate mitochondrial function, leading to lactic acidosis) was halted early, as all 15 of the children receiving DCA experienced significant nerve toxicity without any evidence of benefit from the medication.[13] A randomized controlled trial of DCA in adults with lactic acidosis found that while DCA lowered blood lactate levels, it had no clinical benefit and did not improve hemodynamics or survival.[14]

Thus, while early case reports and pre-clinical data suggested that DCA might be effective for lactic acidosis, subsequent controlled trials have found no clinical benefit of DCA in this setting. In addition, clinical trial subjects were incapable of continuing on DCA as a study medication owing to progressive toxicities.

Cancer

In 2007 reports emerged in the press and via the Internet that Evangelos Michelakis and coworkers at the University of Alberta had reported that sodium dichloroacetate reduced tumors in rats and killed cancer cells in vitro.[15] Because the drug cannot be patented, financing the broad and expensive testing required to obtain FDA approval is problematic.[16] The US Food and Drug Administration enforces the law that prohibits the sale of substances with the suggestion that they are cancer treatments unless they have been approved by the FDA.[17]

The American Cancer Society in 2012 stated that "available evidence does not support the use of DCA for cancer treatment at this time."[11] Physicians warned of potential problems if people attempt to try DCA outside a controlled clinical trial.[18] One problem with attempting this is obtaining the chemical. One fraudster was sentenced to 33 months in prison for selling a white powder containing starch, but no DCA, to people with cancer.[19]

The only monitored in vivo dosage of five human patients with glioblastoma with DCA was not designed to test its efficacy against their cancer. This study was rather to see whether it could be given at a specific dosage safely without causing side effects (e.g. neuropathy). All five patients were receiving other treatments during the study.[20][21] Observations in vitro and of tumours extracted from those five patients suggest that DCA might act against cancer cells by depolarising abnormal mitochondria found in glioblastoma cancer cells – allowing the mitochondria to induce apoptosis (cell death) of the malignant cells.[20] In vitro work with DCA on neuroblastomas (which have fewer recognised mitochondrial abnormalities) showed activity against malignant, undifferentiated cells.[22] A 2016 case report discussed and reviewed the application of DCA in central nervous system malignancies.[23] A 2018 study found that DCA could trigger a metabolic switch from glycolysis (the Warburg effect) to mitochondrial OXPHOS and increase reactive oxygen stress affecting tumor cells. These effects were not observed in non-tumor cells.[24]

Neuropathy

Neuropathy has been a problem in some clinical trials with DCA causing them to be effectively halted,[13] but a 2008 BJC review found that it has not occurred in other DCA trials.[25] The mechanism of DCA induced neuropathy is not well understood.[26] On the one hand in vitro work with nerves has suggested a mechanism for the neuropathic effect of DCA; with DCA showing a dose and exposure dependent demyelination of nerves (stripping of the nerve 'sheath'), which demyelination was partially reversible over time, following washout of DCA.[27] On the other hand, the 2008 review in BJC [25] states "This neurotoxicity resembled the pattern of length-dependent, axonal, sensorimotor polyneuropathy without demyelination." with regard to the 2006 study by Kaufman et al.[13]

Heart failure

DCA has been investigated as a treatment for post-ischemic recovery.[28] There is also evidence that DCA improves metabolism by NADH production stimulation, but may lead to a depletion of NADH in normoxia.[29]

See also

References

  1. ^ a b c d Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, Florida: CRC Press. ISBN 1-4398-5511-0.
  2. ^ "Dichloroacetic Acid". Hazard.com. 1998-04-21. Retrieved 2015-04-17.
  3. ^ [1] Archived April 16, 2015, at the Wayback Machine
  4. ^ Lajin, B.; Braeuer, S.; Borovička, J.; Goessler, W. (2021). "Is the water disinfection by-product dichloroacetic acid biosynthesized in the edible mushroom Russula nigricans?". Chemosphere. 281: 130819. Bibcode:2021Chmsp.28130819L. doi:10.1016/j.chemosphere.2021.130819. PMID 33991903.
  5. ^ Stacpoole, Peter W.; Henderson, George N.; Yan, Zimeng; James, Margaret O. (1998). "Clinical Pharmacology and Toxicology of Dichloroacetate". Environmental Health Perspectives. 106 (Suppl 4): 989–94. doi:10.1093/jnci/djx071. JSTOR 3434142. PMC 1533324. PMID 9703483.
  6. ^ Doughty, Howard Waters.; Derge, Gerhard Julius. (1931). "Preparation of Dichloroacetic Acid". Journal of the American Chemical Society. 53 (4): 1594–1596. doi:10.1021/ja01355a066. ISSN 0002-7863.
  7. ^ "Dichloroacetic Acid". Organic Syntheses. 19: 38. 1939. doi:10.15227/orgsyn.019.0038.
  8. ^ Koontz, Laura (2014). "TCA precipitation". Laboratory Methods in Enzymology: Protein Part C. Vol. 541. pp. 3–10. doi:10.1016/B978-0-12-420119-4.00001-X. ISBN 978-0-12-420119-4. ISSN 1557-7988. PMID 24674058.
  9. ^ Rajalingam, Dakshinamurthy; Loftis, Charles; Xu, Jiashou J; Kumar, Thallapuranam Krishnaswamy S (2009). "Trichloroacetic acid-induced protein precipitation involves the reversible association of a stable partially structured intermediate". Protein Science. 18 (5): 980–993. doi:10.1002/pro.108. ISSN 0961-8368. PMC 2771300. PMID 19388015.
  10. ^ Stacpoole, Peter W. (2017). "Therapeutic Targeting of the Pyruvate Dehydrogenase Complex/Pyruvate Dehydrogenase Kinase (PDC/PDK) Axis in Cancer". JNCI: Journal of the National Cancer Institute. 109 (11). doi:10.1093/jnci/djx071. PMID 29059435.
  11. ^ a b "Dichloracetate (DCA)". American Cancer Society. Archived from the original on 3 May 2015. Retrieved 1 December 2012.
  12. ^ Stacpoole, P. W.; Kerr, D. S.; Barnes, C; Bunch, S. T.; Carney, P. R.; Fennell, E. M.; Felitsyn, N. M.; Gilmore, R. L.; Greer, M; Henderson, G. N.; Hutson, A. D.; Neiberger, R. E.; O'Brien, R. G.; Perkins, L. A.; Quisling, R. G.; Shroads, A. L.; Shuster, J. J.; Silverstein, J. H.; Theriaque, D. W.; Valenstein, E (2006). "Controlled Clinical Trial of Dichloroacetate for Treatment of Congenital Lactic Acidosis in Children". Pediatrics. 117 (5): 1519–31. doi:10.1542/peds.2005-1226. PMID 16651305. S2CID 38328451.
  13. ^ a b c Kaufmann, P.; Engelstad, K.; Wei, Y.; Jhung, S.; Sano, M. C.; Shungu, D. C.; Millar, W. S.; Hong, X.; Gooch, C. L.; Mao, X.; Pascual, J. M.; Hirano, M.; Stacpoole, P. W.; Dimauro, S.; De Vivo, D. C. (2006). "Dichloroacetate causes toxic neuropathy in MELAS: A randomized, controlled clinical trial". Neurology. 66 (3): 324–30. doi:10.1212/01.wnl.0000196641.05913.27. PMID 16476929. S2CID 19623200.
  14. ^ Stacpoole, Peter W.; Wright, Elizabeth C.; Baumgartner, Thomas G.; Bersin, Robert M.; Buchalter, Scott; Curry, Stephen H.; Duncan, Charles A.; Harman, Eloise M.; Henderson, George N.; Jenkinson, Steven; Lachin, John M.; Lorenz, Anthea; Schneider, Stephen H.; Siegel, John H.; Summer, Warren R.; Thompson, Douglas; Wolfe, Christopher L.; Zorovich, Barbara (1992). "A Controlled Clinical Trial of Dichloroacetate for Treatment of Lactic Acidosis in Adults". New England Journal of Medicine. 327 (22): 1564–9. doi:10.1056/NEJM199211263272204. PMID 1435883.
  15. ^ Andy Coghlan (Jan 17, 2007). "Cheap, 'safe' drug kills most cancers". New Scientist. Archived from the original on June 12, 2019. The original article did not have quotation marks around the word "safe".
  16. ^ "No patent? No cancer drug development". New Scientist. Jan 17, 2007.
  17. ^ "'Cancer drug' site shut down". New Scientist. Jul 25, 2007.
  18. ^ Andrea Sands (March 18, 2007). "Patients tout database for drug treatment". Edmonton Journal. p. A13. "If it starts going badly, who is following you before it gets out of control? By the time you realize your liver is failing, you're in big trouble", said Laura Shanner, Associate Professor of Health Ethics at the University of Alberta.
  19. ^ "Canadian Man Sentenced to 33 Months in Prison for Selling Counterfeit Cancer Drugs Using the Internet". US Department of Justice. 25 August 2010. Retrieved January 5, 2018.
  20. ^ a b Michelakis, E. D.; Sutendra, G.; Dromparis, P.; Webster, L.; Haromy, A.; Niven, E.; Maguire, C.; Gammer, T. L.; MacKey, J. R.; Fulton, D.; Abdulkarim, B.; McMurtry, M. S.; Petruk, K. C. (2010). "Metabolic Modulation of Glioblastoma with Dichloroacetate". Science Translational Medicine. 2 (31): 31ra34. doi:10.1126/scitranslmed.3000677. PMID 20463368. S2CID 616711.
  21. ^ "Potential Cancer Drug DCA Tested in Early Trials". Archived from the original on February 18, 2011.
  22. ^ Vella, Serena; Conti, Matteo; Tasso, Roberta; Cancedda, Ranieri; Pagano, Aldo (2012). "Dichloroacetate inhibits neuroblastoma growth by specifically acting against malignant undifferentiated cells". International Journal of Cancer. 130 (7): 1484–93. doi:10.1002/ijc.26173. PMID 21557214. S2CID 19111145.
  23. ^ Lemmo, W; Tan, G (2016). "Prolonged Survival After Dichloroacetate Treatment of Non-Small-Cell Lung Carcinoma-Related Leptomeningeal Carcinomatosis". Journal of Medical Cases. 7 (4): 136–142. doi:10.14740/jmc2456w.
  24. ^ Zhou, Li; Liu, Lianlian; Chai, Wei; Zhao, Ting; Jin, Xin; Guo, Xinxin; Han, Liying; Yuan, Chunli (February 2019). "Dichloroacetic acid upregulates apoptosis of ovarian cancer cells by regulating mitochondrial function". OncoTargets and Therapy. 12: 1729–1739. doi:10.2147/ott.s194329. PMC 6419601. PMID 30881027.
  25. ^ a b Michelakis, E D; Webster, L; MacKey, J R (2008). "Dichloroacetate (DCA) as a potential metabolic-targeting therapy for cancer". British Journal of Cancer. 99 (7): 989–94. doi:10.1038/sj.bjc.6604554. PMC 2567082. PMID 18766181.
  26. ^ "Complementary Approaches: Dichloroacetate (DCA)". CancerQuest. Archived from the original on April 6, 2015.
  27. ^ Felitsyn, Natalia; Stacpoole, Peter W.; Notterpek, Lucia (2007). "Dichloroacetate causes reversible demyelination in vitro: Potential mechanism for its neuropathic effect". Journal of Neurochemistry. 100 (2): 429–36. doi:10.1111/j.1471-4159.2006.04248.x. PMID 17241159.
  28. ^ McVeigh JJ, Lopaschuk GD (Oct 1990). "Dichloroacetate stimulation of glucose oxidation improves recovery of ischemic rat hearts". Am J Physiol. 259 (4 Pt 2): H1079-85. doi:10.1152/ajpheart.1990.259.4.H1079. PMID 2221115.
  29. ^ Jaimes, R 3rd (Jul 2015). "Functional response of the isolated, perfused normoxic heart to pyruvate dehydrogenase activation by dichloroacetate and pyruvate". Pflügers Arch. 468 (1): 131–42. doi:10.1007/s00424-015-1717-1. PMC 4701640. PMID 26142699.{{cite journal}}: CS1 maint: numeric names: authors list (link)

Read other articles:

Grove Karl GilbertGrove Karl GilbertLahir(1843-05-06)6 Mei 1843Rochester, New YorkMeninggal1 Mei 1918(1918-05-01) (umur 74)Jackson, MichiganKebangsaanAmerikaAlmamaterUniversitas RochesterKarier ilmiahBidangGeologi Grove Karl Gilbert (6 Mei 1843 – 1 Mei 1918), dikenal dengan nama singkatan G. K. Gilbert pada sastra akademik, adalah seorang geolog Amerika. Biografi Gilbert lahir di Rochester, New York dan lulusan dari Universitas Rochester. Pada 1871, ia bergabung dalam survei geografi Geor…

العلاقات الليسوتوية النيبالية ليسوتو نيبال   ليسوتو   نيبال تعديل مصدري - تعديل   العلاقات الليسوتوية النيبالية هي العلاقات الثنائية التي تجمع بين ليسوتو ونيبال.[1][2][3][4][5] مقارنة بين البلدين هذه مقارنة عامة ومرجعية للدولتين: وجه المقارنة لي…

Buku programming Java di sub-kelas QA. Klasifikasi Perpustakaan Kongres atau dalam bahasa aslinya disebut Library of Congress Classification (LCC) adalah sistem klasifikasi perpustakaan yang dikembangkan oleh Perpustakaan Kongres Amerika Serikat. Sistem ini digunakan oleh sebagian besar perpustakaan riset dan akademik di AS dan beberapa negara lainnya.[1] Sistem LCC berbeda dengan sistem LCCN Library of Congress Control Number yang diperuntukkan bagi semua buku (dan penulis) dan mendefin…

District in Lower Saxony, Germany District in Lower Saxony, GermanyLüchow-DannenbergDistrict FlagCoat of armsCountryGermanyStateLower SaxonyCapitalLüchowGovernment • District admin.Dagmar SchulzArea • Total1,220 km2 (470 sq mi)Population (31 December 2021)[1] • Total48,472 • Density40/km2 (100/sq mi)Time zoneUTC+01:00 (CET) • Summer (DST)UTC+02:00 (CEST)Vehicle registrationDANWebsitewww.luechow-dannenb…

Demonstration Demonstrators in front of the White House The March on Washington for Lesbian, Gay, and Bi Equal Rights and Liberation was a large political rally that took place in Washington, D.C., on April 25, 1993. Organizers estimated that 1,000,000 attended the March. The D.C. Police Department put the number between 800,000 and more than 1 million,[1] making it one of the largest protests in American history. The National Park Service estimated attendance at 300,000,[2] but …

Синелобый амазон Научная классификация Домен:ЭукариотыЦарство:ЖивотныеПодцарство:ЭуметазоиБез ранга:Двусторонне-симметричныеБез ранга:ВторичноротыеТип:ХордовыеПодтип:ПозвоночныеИнфратип:ЧелюстноротыеНадкласс:ЧетвероногиеКлада:АмниотыКлада:ЗавропсидыКласс:Птиц…

Glenn TiptonInformasi latar belakangNama lahirGlenn Raymond TiptonLahir25 Oktober 1947 (umur 76)Blackheath, West Midlands, Britania RayaGenreHeavy metalPekerjaanMusisi, penulis laguInstrumenGitar, piano, vokal, bassTahun aktif1968 - sekarangLabelColumbia, CBSArtis terkaitJudas Priest, The Flying Hat BandSitus webOfficial website Glenn Raymond Tipton (lahir 25 Oktober 1947) merupakan seorang gitaris dan penyanyi berkebangsaan Inggris. Dia merupakan anggota dari grup musik Judas Priest. Dia d…

Voce principale: Turn- und Sportverein München von 1860. Turn- und Sportverein München von 1860Stagione 2019-2020Sport calcio Squadra Monaco 1860 Allenatore Daniel Bierofka (1ª-14ª) Oliver Beer (15ª) Michael Köllner (16ª-38ª) All. in seconda Oliver Beer Günter Brandl Franz Hübl 3. Liga8º posto Coppa BavieraFinale Maggiori presenzeCampionato: Mölders (37)Totale: Mölders (39) Miglior marcatoreCampionato: Mölders (15)Totale: Mölders (15) StadioGrünwalder Stadion Maggior numero …

Seorang Sturmbannführer dari Waffen-SS Sturmbannführer ([ˈʃtʊʁm.ban.fyːʀɐ], pemimpin unit serangan) adalah sebuah pangkat paramiliter Partai Nazi yang setara dengan mayor[1] yang dipakai dalam beberapa organisasi Nazi, seperti SA, SS, dan NSFK. Diterjemahkan menjadi pemimpin unit serangan (atau badai)[2] (Sturmbann merupakan SA dan SS awal yang setara dengan batalion), pangkat tersebut bermula dari unit pasukan kejut Jerman pada Perang Dunia Pertama. Kutipan ^ Fl…

Reeves Teletape Studios was a group of television studios located in Manhattan in New York City. Owned by Reeves Communications Corporation, it was formed in 1974 by the merger of Reeves Sound Services (a sound and video post-production company and successor to the former Reeves Soundcraft - founded by Hazard E. Reeves), and Tele-tape Productions (a video remote truck and studio facility firm based in NY). Unitel Video bought the studio and its assets in late 1986, and operated them until at lea…

Antonio Candreva Informasi pribadiTanggal lahir 28 Februari 1987 (umur 37)Tempat lahir Roma, ItaliaTinggi 1,80 m (5 ft 11 in)Posisi bermain GelandangInformasi klubKlub saat ini SampdoriaNomor 87Karier junior Lodigiani2003–2004 TernanaKarier senior*Tahun Tim Tampil (Gol)2004–2007 Ternana 48 (0)2007– Udinese 3 (0)2008–2010 → Livorno (pinjaman) 52 (2)2010 → Juventus (pinjaman) 16 (2)2010–2011 → Parma (pinjaman) 31 (3)2011–2012 → Cesena (pinjaman) 18 (2)2012…

This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Garden River Ontario – news · newspapers · books · scholar · JSTOR (December 2009) (Learn how and when to remove this message) Rail bridge over the Garden River. The Garden River is a river in the Algoma District of Ontario, Canada. The rivers source is Saymo lake and Ranger l…

Paleolítico medio • Paleolítico superior • X milenio a. C. El Paleolítico superior es el tercero y último de los periodos en que está dividido el Paleolítico, la etapa inicial de la Edad de Piedra. Está caracterizado por la preponderancia de las industrias líticas englobadas en el modo técnico 4 y clasificadas en distintas cronoculturas: Châtelperroniense, Auriñaciense, Gravetiense, Solutrense y Magdaleniense, según los yacimientos epónimos de Francia donde fueron iden…

O Pagador de PromessasPoster asli dalam bahasa PortugisSutradaraAnselmo DuarteProduserOswaldo MassainiDitulis olehAnselmo DuarteBerdasarkanO Pagador de Promessasoleh Dias GomesPemeranLeonardo VillarGlória MenezesNorma BengellDionísio AzevedoPenata musikGabriel MiglioriSinematograferH.E. FowlePenyuntingCarlos CoimbraPerusahaanproduksiCinedistriDistributorCinedistriEmbrafilmeTanggal rilis 6 Agustus 1962 (1962-08-06)[1] Durasi98 menitNegaraBrasilBahasaPortugis O Pagador de Prom…

ヨハネス12世 第130代 ローマ教皇 教皇就任 955年12月16日教皇離任 964年5月14日先代 アガペトゥス2世次代 レオ8世個人情報出生 937年スポレート公国(中部イタリア)スポレート死去 964年5月14日 教皇領、ローマ原国籍 スポレート公国親 父アルベリーコ2世(スポレート公)、母アルダその他のヨハネステンプレートを表示 ヨハネス12世(Ioannes XII、937年 - 964年5月14日)は、ロー…

هذه قائمة بالأفلام والمسلسلات التلفزيونية من وجهة نظر إسلامية، والمتعلقة بالحضارة الإسلامية، أي الإسلام والتاريخ الإسلامي والثقافة الإسلامية، تميل أغلب الأفلام والمسلسلات إلى تصوير المرأة بالحجاب، وتتوفر معظمها مع ترجمات ودبلجة بلغات متعددة.[1][2][3] مسلسلات ا…

20th century Imperial Chinese Army Beiyang Army北洋軍Symbol of the Beiyang ArmyActive1895–1928Country Qing Empire Republic of China (Beiyang government)TypeArtilleryCavalryInfantrySize20,000 (1901)60,000 (1905)Garrison/HQTianjinEngagements First Sino-Japanese War Xinhai Revolution Occupation of Mongolia Northern Expedition CommandersNotable commandersYuan ShikaiDuan QiruiYinchangFeng GuozhangMilitary unit The Beiyang Army (Chinese: 北洋軍; pinyin: Běi Yáng Jūn; lit. '…

American baseball player (born 1968) Baseball player Curtis LeskanicLeskanic celebrating the twentieth anniversary of the 2004 World SeriesPitcherBorn: (1968-04-02) April 2, 1968 (age 56)Homestead, Pennsylvania, U.S.Batted: RightThrew: RightMLB debutJune 27, 1993, for the Colorado RockiesLast MLB appearanceOctober 2, 2004, for the Boston Red SoxMLB statisticsWin–loss record50–34Earned run average4.36Strikeouts641 Teams Colorado Rockies (1993–1999) Milwauk…

فرازر   الإحداثيات 48°03′31″N 106°02′28″W / 48.058611111111°N 106.04111111111°W / 48.058611111111; -106.04111111111   [1] تقسيم إداري  البلد الولايات المتحدة[2]  التقسيم الأعلى مقاطعة فالي  خصائص جغرافية  المساحة 4.272983 كيلومتر مربع4.272572 كيلومتر مربع (1 أبريل 2010)  ارتفاع 628 متر…

Rear admiral in the NOAA Commissioned Officer Corps This biography of a living person needs additional citations for verification. Please help by adding reliable sources. Contentious material about living persons that is unsourced or poorly sourced must be removed immediately from the article and its talk page, especially if potentially libelous.Find sources: Nancy Hann – news · newspapers · books · scholar · JSTOR (November 2020) (Learn how and when to r…

Kembali kehalaman sebelumnya