415 research outputs found
Multi-domain industrial benchmarks for eddy-current modelling: the COFREND working group
9 pagesInternational audienceDescription of the COFREND working group dedicated to the multi-domain industrial benchmarks for eddy-current modelling and some of their configurations
Antioxidant and Antifungal Activities of Cocoa Butter (Theobroma cacao), Essential Oil of Syzygium aromaticum and a Combination of Both Extracts against Three Dermatophytes
To contribute in the research of better drugs against dermatophytosis, we evaluated the antioxidant and antidermatophytic activities of cocoa butter, cloves essential oil, and a mixture of both extracts. The cocoa butter was obtained by boiling the cocoa paste. The essential oil extracted by hydrodistillation was chemically analysed by gas chromatography and gas chromatography coupled with mass spectrometry. The antioxidant activity was determined using the DPPH scavenging method, and the antidermatophytic activity was evaluated using the agar dilution method. The essential oil, majoritary constituated by eugenol (87.62%), ÎČ-caryophyllene (5.88%), and ÎČ-bisabolene (4.41%), had an antiradical power (4.22 x 10-2) higher than that of BHT (4.00 x 10-3), like the cocoa butter and essential oil mixture (6.06 x 10-3). The essential oil was more active than the griseofulvin: it was fungicidal at 400 ppm against Trichophyton rubrum, and at 900 ppm against Microsporum gypseumand Trichophyton tonsurans. The cocoa butter activity was low, but the mixture with the essential oil had an important activity with inhibitory percentages of 78.69 %, 88.27 %, 91.20% against T. rubrum (at 400 ppm), T. tonsurans(at 900 ppm)and M. gypseum (at 900 ppm)respectively. Cloves essential oil and the mixture with cocoa butter can be used to formulate new drugs against dermatophytes.
Tendon lesion and VEGF-111 injection
Introduction: Tendon lesion is one of the most frequent pathology in sports and by physical workers. This pathology often becomes chronic. For this reason, it is of interest to develop new treatments. Injection of platelet-rich plasma (PRP) seems to be a promising one by releasing growth factors (GF) locally. Among all the GF released by activated platelets, the vascular endothelial growth factor-A (VEGF-A) is known to induce positive effects on vascular function and angiogenesis, and could be implicated in the healing process of tendons. Recently, a novel VEGF-A isoform was identified, the VEGF-111, a biologically active and proteolysis-resistant VEGF-A isoform, also known to present beneficial effects on ischemic diseases. This prompted us to evaluate whether VEGF-111 would have a therapeutic interest within the framework of the tendon pathology.
Methods: 60 Rats were divided into 2 groups: A: control (no injection), B: VEGF-111 treatment. A 5mm defect was surgically induced in rat Achilles tendon after resection of plantaris tendon. Rats received a local injection of VEGF-111 (100ng) in situ after the surgery and were placed in their cages without immobilization. After 5, 15 and 30 days, the traumatized Achilles tendons of 10 rats of both groups were removed and dissected during their healing process. Immediately after sampling, tendons were submitted to a biomechanical tensile test up to rupture, using a âCryo-jawâ. Rats were then euthanized.
Statistical analyses were made with an ANOVA. Values are significant when p-value is below 0.05.
Results: Our results showed that the developed force necessary to induce tendon rupture during biomechanical tensile test was greater for tendons which had received an injection of 100ng of VEGF-111. These results were already noticed from day 5 onwards. The ratio between force and weight increased with time in both groups, but this ratio was greater for tendons which had been submitted to an injection of VEGF111. The surface area of the section of the tendons increased between 5 and 15 days followed by a stabilization. After 30 days, sections in both groups were similar. Thus, the constraint was similar after 5 and 15 days but was better for VEGF111 group after one month.
Discussion - Conclusion: This experimentation has shown that a 100ng injection of VEGF-111 stimulated tendon healing process as suggested by the increased force needed to break tendons during its healing process and the increased of constraint in comparison with the control group. Other experimentations with different concentration of VEGF111 are now in process.
Acknowledgement : This experimentation was partially financed by âStandard de LiĂšge 2007â and âLejeune-Lechien 2008â grants
Injection de concentrés plaquettaires et régénération tendineuse : modÚle animal
peer reviewedIntroduction :
La rĂ©gĂ©nĂ©ration tendineuse en traumatologie du sport demeure un processus actuellement difficile Ă gĂ©rer et de nouvelles voies thĂ©rapeutiques sont en cours dâexploration. La littĂ©rature rĂ©cente fait Ă©tat dâeffets bĂ©nĂ©fiques sur la rĂ©gĂ©nĂ©ration tendineuse de concentrĂ©s plaquettaires (platelet-rich plasma ou PRP), administrĂ©s in situ, dus au relargage de facteurs de croissance par activation des plaquettes et Ă leur activitĂ© stimulante au cours de la cicatrisation. DĂšs lors, nous avons souhaitĂ© tester lâeffet bĂ©nĂ©fique de ce traitement sur des rats prĂ©alablement lĂ©sĂ©s au niveau de leur tendon dâAchille.
Matériel et Méthode :
Une section unilatĂ©rale du tendon dâAchille a Ă©tĂ© rĂ©alisĂ©e chez 60 rats Sprague Dawley adultes. De ces 60 rats, 30 ont subi une cicatrisation naturelle (rats contrĂŽles) et 30 rats ont bĂ©nĂ©ficiĂ© dâune injection in situ de PRP le jour de la lĂ©sion. Diverses Ă©tudes biomĂ©caniques, biochimiques et histologiques ont Ă©tĂ© rĂ©alisĂ©es sur ces tendons dâAchille en cours de cicatrisation Ă respectivement J5, J15 et J30 aprĂšs lĂ©sion. Dix rats supplĂ©mentaires ont servi de tĂ©moins sains (sans lĂ©sion tendineuse). LâĂ©tude biomĂ©canique apprĂ©ciait la rĂ©sistance maximale des tendons Ă la traction Ă lâaide de mors type « cryo-jaws ». LâĂ©tude histologique Ă©valuait lâĂ©volution cellulaire pendant la phase de cicatrisation. Lâanalyse transcriptomique Ă©tudiait lâexpression de gĂšnes codant pour le collagĂšne de type III, les mĂ©talloprotĂ©ases matricielles (MMP-9) et la tĂ©nomoduline (TNMD), ainsi quâun dosage dâhydroxyproline permettant dâĂ©valuer la quantitĂ© de collagĂšne prĂ©sente dans le tendon au cours de la cicatrisation.
RĂ©sultats :
LâĂ©tude biomĂ©canique dĂ©montre la meilleure rĂ©sistance des tendons traitĂ©s avec du PRP par rapport aux tendons contrĂŽles Ă J5 (+19%), J15 (+30%) et significativement Ă J30 (+43%). LâĂ©tude histologique suggĂšre quâune injection de PRP stimule la prolifĂ©ration cellulaire, favorise lâorganisation tissulaire, stimule lâangiogenĂšse et la rĂ©organisation architectural du collagĂšne. LâĂ©tude biochimique ne permet pas dâexpliquer les effets bĂ©nĂ©fiques puisquâil nây a pas de diffĂ©rence dans lâexpression des gĂšnes des diffĂ©rentes molĂ©cules matricielles (collagĂšne de type III, MMP-9 et TNMD) ni dans la quantitĂ© dâhydroxyproline qui sâaccroit au cours du temps de la cicatrisation de façon similaire dans les deux groupes.
Conclusion :
Lâinjection de PRP amĂ©liore et accĂ©lĂšre la cicatrisation tendineuse et augmente la rĂ©sistance aux contraintes mĂ©caniques du tendon en cours de cicatrisation
New genetic loci link adipose and insulin biology to body fat distribution.
Body fat distribution is a heritable trait and a well-established predictor of adverse metabolic outcomes, independent of overall adiposity. To increase our understanding of the genetic basis of body fat distribution and its molecular links to cardiometabolic traits, here we conduct genome-wide association meta-analyses of traits related to waist and hip circumferences in up to 224,459 individuals. We identify 49 loci (33 new) associated with waist-to-hip ratio adjusted for body mass index (BMI), and an additional 19 loci newly associated with related waist and hip circumference measures (PÂ <Â 5Â ĂÂ 10(-8)). In total, 20 of the 49 waist-to-hip ratio adjusted for BMI loci show significant sexual dimorphism, 19 of which display a stronger effect in women. The identified loci were enriched for genes expressed in adipose tissue and for putative regulatory elements in adipocytes. Pathway analyses implicated adipogenesis, angiogenesis, transcriptional regulation and insulin resistance as processes affecting fat distribution, providing insight into potential pathophysiological mechanisms
Les droits disciplinaires des fonctions publiques : « unification », « harmonisation » ou « distanciation ». A propos de la loi du 26 avril 2016 relative à la déontologie et aux droits et obligations des fonctionnaires
The production of tt⟠, W+bb⟠and W+cc⟠is studied in the forward region of protonâproton collisions collected at a centre-of-mass energy of 8 TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98±0.02 fbâ1 . The W bosons are reconstructed in the decays WââÎœ , where â denotes muon or electron, while the b and c quarks are reconstructed as jets. All measured cross-sections are in agreement with next-to-leading-order Standard Model predictions.The production of , and is studied in the forward region of proton-proton collisions collected at a centre-of-mass energy of 8 TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98 0.02 \mbox{fb}^{-1}. The bosons are reconstructed in the decays , where denotes muon or electron, while the and quarks are reconstructed as jets. All measured cross-sections are in agreement with next-to-leading-order Standard Model predictions
Increased nutrient supply to the Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO<sub>2</sub> rise
A rise in the atmospheric CO2 concentration of ~20 parts per million over the course of the Holocene has long been recognized as exceptional among interglacials and is in need of explanation. Previous hypotheses involved natural or anthropogenic changes in terrestrial biomass, carbonate compensation in response to deglacial outgassing of oceanic CO2, and enhanced shallow water carbonate deposition. Here, we compile new and previously published fossil-bound nitrogen isotope records from the Southern Ocean that indicate a rise in surface nitrate concentration through the Holocene. When coupled with increasing or constant export production, these data suggest an acceleration of nitrate supply to the Southern Ocean surface from underlying deep water. This change would have weakened the oceanâs biological pump that stores CO2 in the ocean interior, possibly explaining the Holocene atmospheric CO2 rise. Over the Holocene, the circum-North Atlantic region cooled, and the formation of North Atlantic Deep Water appears to have slowed. Thus, the âseesawâ in deep ocean ventilation between the North Atlantic and the Southern Ocean that has been invoked for millennial-scale events, deglaciations and the last interglacial period may have also operated, albeit in a more gradual form, over the Holocene
Observation of the B0 â Ï0Ï0 decay from an amplitude analysis of B0 â (Ï+Ïâ)(Ï+Ïâ) decays
Protonâproton collision data recorded in 2011 and 2012 by the LHCb experiment, corresponding to an integrated luminosity of 3.0 fbâ1 , are analysed to search for the charmless B0âÏ0Ï0 decay. More than 600 B0â(Ï+Ïâ)(Ï+Ïâ) signal decays are selected and used to perform an amplitude analysis, under the assumption of no CP violation in the decay, from which the B0âÏ0Ï0 decay is observed for the first time with 7.1 standard deviations significance. The fraction of B0âÏ0Ï0 decays yielding a longitudinally polarised final state is measured to be fL=0.745â0.058+0.048(stat)±0.034(syst) . The B0âÏ0Ï0 branching fraction, using the B0âÏKâ(892)0 decay as reference, is also reported as B(B0âÏ0Ï0)=(0.94±0.17(stat)±0.09(syst)±0.06(BF))Ă10â6
Measurement of the (eta c)(1S) production cross-section in proton-proton collisions via the decay (eta c)(1S) -> p(p)over-bar
The production of the state in proton-proton collisions is probed via its decay to the final state with the LHCb detector, in the rapidity range GeV/c. The cross-section for prompt production of mesons relative to the prompt cross-section is measured, for the first time, to be at a centre-of-mass energy TeV using data corresponding to an integrated luminosity of 0.7 fb, and at TeV using 2.0 fb. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the and decays to the final state. In addition, the inclusive branching fraction of -hadron decays into mesons is measured, for the first time, to be , where the third uncertainty includes also the uncertainty on the inclusive branching fraction from -hadron decays. The difference between the and meson masses is determined to be MeV/c.The production of the state in proton-proton collisions is probed via its decay to the final state with the LHCb detector, in the rapidity range . The cross-section for prompt production of mesons relative to the prompt cross-section is measured, for the first time, to be at a centre-of-mass energy using data corresponding to an integrated luminosity of 0.7Â fb , and at using 2.0Â fb . The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the and decays to the final state. In addition, the inclusive branching fraction of -hadron decays into mesons is measured, for the first time, to be , where the third uncertainty includes also the uncertainty on the inclusive branching fraction from -hadron decays. The difference between the and meson masses is determined to be .The production of the state in proton-proton collisions is probed via its decay to the final state with the LHCb detector, in the rapidity range GeV/c. The cross-section for prompt production of mesons relative to the prompt cross-section is measured, for the first time, to be at a centre-of-mass energy TeV using data corresponding to an integrated luminosity of 0.7 fb, and at TeV using 2.0 fb. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the and decays to the final state. In addition, the inclusive branching fraction of -hadron decays into mesons is measured, for the first time, to be , where the third uncertainty includes also the uncertainty on the inclusive branching fraction from -hadron decays. The difference between the and meson masses is determined to be MeV/c
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