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Accuracy of citrulline, I-FABP and d-lactate in the diagnosis of acute mesenteric ischemia
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Research data are not shared.Supplementary Information oi available online at: https://www.nature.com/articles/s41598-021-98012-w#Sec14 .Early diagnosis of acute mesenteric ischemia (AMI) remains a clinical challenge, and no biomarker has been consistently validated. We aimed to assess the accuracy of three promising circulating biomarkers for diagnosing AMIâcitrulline, intestinal fatty acid-binding protein (I-FABP), and D-lactate. A cross-sectional diagnostic study enrolled AMI patients admitted to the intestinal stroke center and controls with acute abdominal pain of another origin. We included 129 patientsâ50 AMI and 79 controls. Plasma citrulline concentrations were significantly lower in AMI patients compared to the controls [15.3 ÎŒmol/L (12.0â26.0) vs. 23.3 ÎŒmol/L (18.3â29.8), pâ=â0.001]. However, the area under the receiver operating curves (AUROC) for the diagnosis of AMI by Citrulline was low: 0.68 (95% confidence intervalâ=â0.58â0.78). No statistical difference was found in plasma I-FABP and plasma D-lactate concentrations between the AMI and control groups, with an AUROC of 0.44, and 0.40, respectively. In this large cross-sectional study, citrulline, I-FABP, and D-lactate failed to differentiate patients with AMI from patients with acute abdominal pain of another origin. Further research should focus on the discovery of new biomarkers.Grants from MSD-Avenir and APHP funded the SURVIBIO study; Alexandre Nuzzo received Ph.D. Grants from âFondation de l'Avenirâ and the French Gastroenterology Society (SNFGE)
Structure de bandes du magnésium dans le métal et l'oxyde MgO par spectroscopie X
The K emission and absorption X-ray spectra of metallic magnesium and magnesium oxide have been observed with different experimental conditions. The results are discussed. Informations are deduced on the band structure of magnesium ; they are compared to those given by L spectrum and also to the results of theoretical calculations.Les spectres X d'émission et d'absorption K du magnésium à l'état métallique et à l'état d'oxyde ont été observés pour différentes conditions expérimentales. Les résultats sont discutés. Des informations concernant la structure de bandes du magnésium sont déduites et comparées à celles données par le spectre d'émission L ainsi qu'aux résultats de calculs théoriques
Mesure de l'affaiblissement du rayonnement X par le bĂ©ryllium, le carbone et diffĂ©rents plastiques entre 4 et 17,5 Ă
The X-ray absorption coefficients for beryllium and carbon were measured as a function of the wavelength continuously from 8 to 14 Ă
. The experimental values obtained are compared with various semi-empirical estimations and with the theoretical values obtained from Stobbe's formulas taking account of the screen effects. The transmission of various plastics films was measured at discrete wavelength values between 4 and 17 Ă
, from which semi-empirical formulas are deduced for the variation of their absorption coefficient in this range.Les coefficients d'affaiblissement du rayonnement X par le bĂ©ryllium et le carbone ont Ă©tĂ© mesurĂ©s de maniĂšre continue en longueur d'onde entre 8 et 14 Ă
. Les valeurs expĂ©rimentales ont Ă©tĂ© comparĂ©es aux diffĂ©rentes estimations semi-empiriques utilisables et aux prĂ©visions thĂ©oriques calculĂ©es Ă partir des formules de Stobbe, en tenant compte ou non des effets d'Ă©cran. La transmission de diffĂ©rentes feuilles de matiĂšres plastiques a Ă©tĂ© mesurĂ©e pour des longueurs d'onde discrĂštes entre 4 et 17 Ă
et des formules semi-empiriques de variation de leurs coefficients d'affaiblissement dans ce domaine spectral en ont été déduites
Les champignons filamenteux producteurs d'aromes fruites : etudes de faisabilite sur substrats agro-industriels
CNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc
ĂTUDE PAR SPECTROSCOPIE X DE LA DISTRIBUTION DES NIVEAUX ĂLECTRONIQUES DE L'ALUMINIUM DANS LE MĂTAL ET DANS L'OXYDE Al2O3
Les spectres X d'Ă©mission et d'absorption K de l'aluminium Ă l'Ă©tat mĂ©tallique et Ă l'Ă©tat d'oxyde Al2O3 ont Ă©tĂ© analysĂ©s comparativement. L'influence du mode d'excitation sur la forme et la largeur de la bande KÎČ a Ă©tĂ© mise en Ă©vidence ; des renseignements concernant la structure Ă©lectronique de l'aluminium ont Ă©tĂ© dĂ©duits.The K emission and absorption X-ray spectra of metallic aluminium and aluminium oxide have been compared. Modifications to the form and width of the KÎČ band due to the type of excitation have been observed. Information was obtained on the electron structure of metallic aluminium
STRUCTURE DE BANDES DE QUELQUES MĂTAUX ET COMPOSĂS PAR SPECTROSCOPIE X DE FLUORESCENCE
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DISORDER EFFECTS ON GaP CORE LEVELS STUDIED BY ELECTRON SPECTROSCOPIES
A study by X-ray induced photoelectron and Auger electron spectroscopies of P and Ga core levels from flash-evaporated crystalline and amorphous Gap films is presented. Beside the effects of contamination the results indicate the existence of partial chemical disorder in the amorphous material