Matches in SemOpenAlex for { <https://semopenalex.org/work/W2073778607> ?p ?o ?g. }
Showing items 1 to 93 of
93
with 100 items per page.
- W2073778607 endingPage "n/a" @default.
- W2073778607 startingPage "n/a" @default.
- W2073778607 abstract "In order to detect the misuse of endogenous anabolic steroids such as testosterone by athletes a total of n = 1734 suspicious urine samples were investigated by gas chromatography/combustion/isotope ratio mass spectrometry throughout the years 2005, 2006 and 2007. The 13C/12C ratio of a target substance (androsterone, a testosterone metabolite) was compared to the 13C/12C ratio of an endogenous reference compound (11β-hydroxyandrosterone). N = 1340 samples were investigated due to elevated testosterone/epitestosterone ratios, with n = 87 (6.5%) exceptional findings regarding their isotopic ratios. An additional n = 164 samples were investigated because of elevated dehydroepiandrosterone concentrations, with n = 2 (1.2%) exceptional findings. The remainder were subjected to isotope ratio analysis because of elevated androsterone levels or because this was requested by sports federations. Significant differences between female and male samples were found for the 13C/12C ratios of androsterone and 11β-hydroxyandrosterone but not for samples taken in or out of competition. A further n = 645 samples originating from other World Anti-Doping Agency accredited laboratories, mainly throughout Europe as well as South America, South Africa and Southeast Asia, were investigated. The 13C/12C ratios of the urinary steroids differ significantly for each geographical region, reflecting the dietary status of the individuals. The system stability over time has been tested by repeated injections of a standard solution and repeated processing of frozen stored blank urine. Despite a drift over time in absolute 13C/12C ratios, no significant change in the difference of 13C/12C (11β-hydroxyandrosterone) minus 13C/12C (androsterone) could be observed. Copyright © 2009 John Wiley & Sons, Ltd. Copyright © 2009 John Wiley & Sons, Ltd." @default.
- W2073778607 created "2016-06-24" @default.
- W2073778607 creator A5022487525 @default.
- W2073778607 creator A5036531177 @default.
- W2073778607 creator A5037454586 @default.
- W2073778607 creator A5078812809 @default.
- W2073778607 date "2009-01-01" @default.
- W2073778607 modified "2023-10-17" @default.
- W2073778607 title "<sup>13</sup>C/<sup>12</sup>C Ratios of endogenous urinary steroids investigated for doping control purposes" @default.
- W2073778607 cites W1970109735 @default.
- W2073778607 cites W1974005559 @default.
- W2073778607 cites W2004695282 @default.
- W2073778607 cites W2017691886 @default.
- W2073778607 cites W2022321034 @default.
- W2073778607 cites W2022441024 @default.
- W2073778607 cites W2059849751 @default.
- W2073778607 cites W2065816346 @default.
- W2073778607 cites W2085199314 @default.
- W2073778607 cites W2101201479 @default.
- W2073778607 cites W2104799987 @default.
- W2073778607 cites W2112628426 @default.
- W2073778607 cites W2112696664 @default.
- W2073778607 cites W4231862986 @default.
- W2073778607 cites W86529529 @default.
- W2073778607 doi "https://doi.org/10.1002/dta.15" @default.
- W2073778607 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20355178" @default.
- W2073778607 hasPublicationYear "2009" @default.
- W2073778607 type Work @default.
- W2073778607 sameAs 2073778607 @default.
- W2073778607 citedByCount "14" @default.
- W2073778607 countsByYear W20737786072018 @default.
- W2073778607 countsByYear W20737786072019 @default.
- W2073778607 countsByYear W20737786072020 @default.
- W2073778607 countsByYear W20737786072021 @default.
- W2073778607 countsByYear W20737786072023 @default.
- W2073778607 crossrefType "journal-article" @default.
- W2073778607 hasAuthorship W2073778607A5022487525 @default.
- W2073778607 hasAuthorship W2073778607A5036531177 @default.
- W2073778607 hasAuthorship W2073778607A5037454586 @default.
- W2073778607 hasAuthorship W2073778607A5078812809 @default.
- W2073778607 hasBestOaLocation W20737786071 @default.
- W2073778607 hasConcept C126322002 @default.
- W2073778607 hasConcept C134018914 @default.
- W2073778607 hasConcept C162356407 @default.
- W2073778607 hasConcept C170671577 @default.
- W2073778607 hasConcept C185592680 @default.
- W2073778607 hasConcept C2777477808 @default.
- W2073778607 hasConcept C2777911890 @default.
- W2073778607 hasConcept C2779279991 @default.
- W2073778607 hasConcept C2779341496 @default.
- W2073778607 hasConcept C2779746161 @default.
- W2073778607 hasConcept C2780026642 @default.
- W2073778607 hasConcept C2780902042 @default.
- W2073778607 hasConcept C43617362 @default.
- W2073778607 hasConcept C55493867 @default.
- W2073778607 hasConcept C71315377 @default.
- W2073778607 hasConcept C71924100 @default.
- W2073778607 hasConceptScore W2073778607C126322002 @default.
- W2073778607 hasConceptScore W2073778607C134018914 @default.
- W2073778607 hasConceptScore W2073778607C162356407 @default.
- W2073778607 hasConceptScore W2073778607C170671577 @default.
- W2073778607 hasConceptScore W2073778607C185592680 @default.
- W2073778607 hasConceptScore W2073778607C2777477808 @default.
- W2073778607 hasConceptScore W2073778607C2777911890 @default.
- W2073778607 hasConceptScore W2073778607C2779279991 @default.
- W2073778607 hasConceptScore W2073778607C2779341496 @default.
- W2073778607 hasConceptScore W2073778607C2779746161 @default.
- W2073778607 hasConceptScore W2073778607C2780026642 @default.
- W2073778607 hasConceptScore W2073778607C2780902042 @default.
- W2073778607 hasConceptScore W2073778607C43617362 @default.
- W2073778607 hasConceptScore W2073778607C55493867 @default.
- W2073778607 hasConceptScore W2073778607C71315377 @default.
- W2073778607 hasConceptScore W2073778607C71924100 @default.
- W2073778607 hasLocation W20737786071 @default.
- W2073778607 hasLocation W20737786072 @default.
- W2073778607 hasOpenAccess W2073778607 @default.
- W2073778607 hasPrimaryLocation W20737786071 @default.
- W2073778607 hasRelatedWork W1555951283 @default.
- W2073778607 hasRelatedWork W2012862886 @default.
- W2073778607 hasRelatedWork W2065770628 @default.
- W2073778607 hasRelatedWork W2073052457 @default.
- W2073778607 hasRelatedWork W2075355805 @default.
- W2073778607 hasRelatedWork W2104799987 @default.
- W2073778607 hasRelatedWork W2181958518 @default.
- W2073778607 hasRelatedWork W2393737303 @default.
- W2073778607 hasRelatedWork W2805580013 @default.
- W2073778607 hasRelatedWork W2466762159 @default.
- W2073778607 isParatext "false" @default.
- W2073778607 isRetracted "false" @default.
- W2073778607 magId "2073778607" @default.
- W2073778607 workType "article" @default.