Academic literature on the topic 'Ultratrail'

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Dissertations / Theses on the topic "Ultratrail"

1

Mashal, Mohammad Shafiq. "Développement et validation d'une méthode HPLC-MS/HRMS pour le criblage d'AINS dans la salive et le sang capillaire : application à l'étude de la prévalence des AINS dans l'ultratrail." Electronic Thesis or Diss., Lyon 1, 2022. https://n2t.net/ark:/47881/m63n2397.

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Les anti-inflammatoires non stéroidiens (AINS) sont l’un des médicaments les plus utilisés dans le monde, accessibles sur ordonnances ou en vente libre. Plusieurs articles ont fait état d’une forte consommation d’AINS par des coureurs pendant les ultratrails. Plusieurs études montrent qu’environ 50% des coureurs utillisent des AINS sans ordonnance médicale, sans forcément connaître leurs effets indésirables et leur toxicité. A ce jour, seulement des données basées sur des questionnaires ont été rapportées sur la prévalence des AINS chez les ultratrailers. Or, en raison de la méconnaissance des coureurs concernant les AINS, l’utilisation du questionnaire peut entraîner des résultats faux positifs ou faux négatifs. Dans cette étude, nous avons étudié la prévalence des AINS chez les utratrailers via des prélèvements de salive et sang capillaire. Des protocoles de préparation d’échantillon et une méthode LC-MS/HRMS ont été développés puis validés pour 19 AINS dans la salive et pour 18 AINS dans le sang capillaire. La méthode a été appliquée avec succès sur des échantillons collectés auprès de participants de l’Ultratrail du Mont Blanc® (UTMB®) 2021. Les résultats ont montré une prévalence des AINS supérieure dans les prélèvements de sang capillaire (46,6%) que dans les prélèvements salivaires (18,5%) ainsi qu’à partir des données du questionnaire (13,8%). En conclusion, ce travail est le premier rapportant l’identification et la quantification d’autant d’AINS dans la salive et le sang capillaire. De plus, l’étude menée lors de l’UTMB® 2021 a montré que la recherche d’AINS dans le sang capillaire est le moyen le plus pertinent pour étudier la prévalence dans l’ultratrail<br>Non-steroidal anti-inflammatory drugs (NSAIDs) are one of the most used drugs worldwide accessible through medical prescription or over-the-counter (OTC). Several published articles have reported a high consumption of NSAIDs by runners during ultratrail. Pain relief and prevention are the main reasons for these drugs consumption by runners. Several studies reported that around 50% runners used NSAIDs without medical prescription, these data show that half of runner may have low information or even lack of information about NSAIDs adverse effects. Up to date, only questionnaire-based data reported about NSAIDs prevalence by the runners. Therefore, using questionnaire may not provide the right information and leads to false positive or false negative results. In this study, we used oral fluid (OF) and dried blood spots (DBS), as biological samples for the study of NSAIDs consumption prevalence by the runners. Sample preparation workflows and a LC-MS/HRMS analytical method were developed and validated according to European Medicines Agency guideline for 19 and 18 different NSAIDs in OF and DBS, respectively. The method was successfully applied on OF and DBS samples collected from Ultramarathon du Mont Blanc® 2021. Results showed a higher prevalence of NSAIDs using DBS (46.6%) than OF (18.5%) and questionnaire (13.8%). To conclude, this work is the first one that reported a LC-MS/HRMS method for identification and quantification of as many NSAIDs in oral fluid and dried blood spots. Moreover, the prospective study conducted on UTMB® 2021 showed that the analysis of drugs directly in DBS is the most relevant tool to determine the prevalence in ultratrail events
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2

Ding, Wenwu Carleton University Dissertation Chemistry. "Electrochemical hydride generation for ultratrace analysis." Ottawa, 1995.

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3

Hernández, Belén. "Ultratrace analysis by resonance ionisation mass spectrometry (RIMS)." Thesis, Manchester Metropolitan University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396526.

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4

Xu, Fei 1971. "Investigation of Ultratrace Metallic and Organic Contaminants in Semiconductor Processing Environments." Thesis, University of North Texas, 1997. https://digital.library.unt.edu/ark:/67531/metadc277845/.

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Detection of ultratrace levels of metallic ion impurities in hydrofluoric acid solutions and alkaline hydrogen peroxide solution was demonstrated using a silicon-based sensing electrode. The sensor's operation principle is based on direct measurements of the silicon open-circuit potential shift generated by the interaction between metallic ions and the silicon-based sensing surface. The new sensor can have practical applications in the on-line monitoring of microelectronic chemical processing. The detection of Ag+ content in KODAK waste water was carried out successfully by this novel sensor. Trace levels of organic impurities in the hydrofluoric acid solutions and in the cleanroom air were characterized by multiple internal reflection infrared spectroscopy (MIRIS) using an organics probe prepared directly from a regular silicon wafer.
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5

Taylor, Ian. "Novel chelating silicas for the preconcentration of ultratrace metals in natural waters." Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316134.

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6

Worrasettapong, Watcharapong. "Ultratrace analysis and speciation studies on trace elements in environmental and biological samples." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269381.

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7

Huber, Jessica [Verfasser]. "Development of enhanced analytical methods for ultratrace determination of mercury in natural water / Jessica Huber." Ulm : Universität Ulm, 2017. http://d-nb.info/1138277746/34.

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8

HASEGAWA, Takuya, Hirotaka MATSUURA, Kazumi INAGAKI, and Hiroki HARAGUCHI. "Major-to-Ultratrace Elements in Bone-Marrow Fluid as Determined by ICP-AES and ICP-MS." 日本分析化学会, 2003. http://hdl.handle.net/2237/8747.

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9

Wallace, Nicole. "Forensic Science Applications Utilizing Nanomanipulation-Coupled to Nanospray Ionization-Mass Spectrometry for the Analysis of Ultra-Trace Illicit Drugs." Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc33209/.

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Presented in this thesis are two methods that are coupled to the instrumentation for the recovery and analysis of ultra-trace illicit drug residues. The electrostatic dust lifting process is coupled with nanomanipulation-nanospray ionization to retrieve drug particles off of hard surfaces for analysis. For the second method, drug residues from fingerprint impressions are extracted followed by analysis. The methodology of these hyphenated techniques toward forensic science applications is applied as to explore limits of detection, sensitivity, and selectivity of analytes as well as immediacy and efficiency of analysis. The application of nanomanipulation-coupled to nanospray ionization-mass spectrometry toward forensic science based applications is considered as future improvements to trace and ultra-trace analysis.
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10

Darrouzes, Jérôme. "Amélioration des étapes analytiques pour la spéciation du sélénium au niveau ultratrace : Apport d'un spectromètre de masse à couplage inductif équipé d'une cellule de collision/réaction (ICP-CC/R-MS)." Pau, 2005. http://www.theses.fr/2005PAUU3029.

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Au vu de l'importance des propriétés du sélénium, de nombreux travaux ont été menés afin de développer des méthodes d'analyse de spéciation de cet élément. Le couplage entre la chromatographie liquide haute performance et le spectromètre de masse à couplage inductif est le plus utilisé. L'objectif des travaux réalisés dans le cadre de cette thèse a été d'atteindre l'analyse de spéciation du sélénium au niveau ultratrace, incluant à la fois des composés organiques et inorganiques. Pour cela, nous avons utilisé les dernières générations d'ICPMS quadripolaires équipés d'un dispositif de collision/réaction qui permet de supprimer les interférences polyatomiques sur les isotopes majoritaires du sélénium. L'optimisation des conditions d'utilisation de ce dispositif ainsi que l'amélioration des techniques en amont de la détection ont été successivement réalisées. Les techniques développées ont été validées puis appliquées à des échantillons d'eaux ainsi qu'à des échantillons biologiques. Ces méthodes permettent l'analyse de spéciation du sélénium au niveau du ng(Se). L-1 dans des échantillons réels<br>Due to the important properties of selenium, numerous works have been undertaken to realize the speciation analysis of this element. The coupling of an HPLC with a mass spectrometer is commonly used. This report presents the improvements realized on the existing methods to simultaneously analyse inorganic and organic species at the ultratrace level. We have used the last generation of quadrupole ICPMS equipped with collision/reaction cell to remove argon based polyatomic intereferences on major selenium isotopes. The optimization of this device as well as improvement of analytical steps before detection have been carefully realised. The developed techniques have been validated and applied to different water and biological samples at the ng(Se). L-1 level
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