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Accumulation of Flavonoids in an ntra ntrb Mutant Leads to Tolerance to UV-C

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Molecular Plant 2009年第2期2卷 249-258页

作者： Talaat Bashandy Ludivine Taconnat Jean-Pierre Renou Yves Meyer Jean-Philippe Reichheld Laboratoire Genome et Developpement des Plantes Universite de Perpignan UMR CNRS 5096 52 avenue Paul Alduy 66860 Perpignan France Unite de Recherche en Genomique Vegetale 91057 Evry cedex France

NADPH-dependent thioredoxin reductases （NTRs） are key regulatory enzymes determining the redox state of thioredoxins. There are two genes encoding NTRs （NTRA and NTRB） in the Arabidopsis genome, each encoding a cytosolic and a mitochondrial isoform. A double ntra ntrb mutant has recently been characterized and shows slower plant growth, slightly wrinkled seeds and a remarkable hypersensitivity to buthionine sulfoximine （BSO）, a specific inhibitor of gluta- thione biosynthesis. In this paper, we demonstrate that this mutant also accumulates higher level of flavonoids. Analysis of transcriptome data showed that several genes of the flavonoid pathway are overexpressed in the ntra ntrb mutant. Accumulation of flavonoids is generally considered a hallmark of plant stress. Nevertheless, no elevation of the expression of genes encoding ROS-detoxification enzymes was observed, suggesting that the ntra ntrb plants do not suffer from oxidative disease. Another hypothesis suggests that flavonoids are specifically synthesized in the ntra ntrb mutant in order to rescue the inactivation of NTR. To test this, the ntra ntrb mutant was crossed with transparent testa 4 （tt4） plants with a mutation in the gene encoding the first enzyme in flavonoid biosynthesis. As ntra ntrb plants are more resistant to UV-C treatment than wild-type plants, this higher resistance was abolished in the ntra ntrb tt4 mutant, suggesting that accumulation of flavonoids in the ntra ntrb mutant protects plants against UV-light.

关键词： abiotic/environmental stress oxidative and photo-oxidative stress secondary metabolism - phenylpropanoidsand phenolics gene expression Arabidopsis.

Relationships between chlorophyll a, bacteria, ATP, POC and respiration rates in the Changjiang Estuary and the plume

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Acta Oceanologica Sinica 1992年第3期11卷 425-434页

作者： C. Courties G. Cauwet CNRS Station Biologiue de Roscoff 29211 Roscoff FranceCNRS Universite de Perpignan Laboratoire de Sedimentologie et Geochimie Marines 66025 Perpignan France

-Bacteria abundance, chlorophyll a, ATP and POC concentrations and respiration rates of microorganisms in the Changjiang Estuary and the plume were determined in July 1986. The high values of bacteria abundance occurred in the river mouth in association with suspended matter. It is assumed that bacteria were the major contributor to ATP and the main consumer of dissolved oxygen, and that the relationship between ATP and POC was present in that area. In the dilution zone (salinity; 25-30), instead of bacteria, phytoplankton was the major contributor to ATP and respiration rates, due to diatom bloom. Close relationships between Chi a and ATP, and ATP and POC were observed. Contribution of microbial carbon to POC was also estimated.

关键词： POC and respiration rates in the Changjiang Estuary and the plume Relationships between chlorophyll a bacteria ATP

Evaporation and Combustion of a Drop of Liquid Fuel—A Review

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Smart Grid and Renewable Energy 2022年第2期13卷 28-54页

作者： Dabilgou Téré Tubreoumya Guy Christian Haro Kayaba Bagre Boubou Sandwidi Sayouba Daho Tizane Koulidiati Jean Sanogo Oumar Zeghmati Belkacem Bere Antoine Laboratoire de Physique et de Chimie de l’Environnement (LPCE) Université Joseph Ki-Zerbo Ouagadougou Burkina Faso Laboratoire de Mathématiques et Physiques (LAMPS) Université de Perpignan via Domitia Perpignan France Centre National de la Recherche Scientifique et Technologique (CNRST) Institut de Recherche en Sciences Appliquées et Technologies (IRSAT) Ouagadougou Burkina Faso

The accelerated depletion of oil reserves and the often exorbitant cost of fossil fuels contribute to the development of fuels from renewable sources. The objective of this work is to analyze the influence of the properties of renewable fuels on their evaporation in natural convection, their combustion and their use in internal combustion engines. A summary of the various numerical and experimental works from the literature has been presented in this work. This work focuses on the numerical modelling of the natural convection evaporation of an isolated drop of a liquid fuel in natural convection. The transfers in the liquid and vapour phases are described by the conservation equations of mass and species, momentum and energy. The main feature of this work is the consideration of advection, azimuthal angle and thickness of the vapour phase of the drop during evaporation of the drop.

关键词： Drop Evaporation Combustion Convection Modelling Temperature

Ultrasound aspects and risk factors associated with urogenital schistosomiasis among primary school children in Mali

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Infectious Diseases of Poverty 2023年第2期12卷 133-133页

作者： Privat Agniwo Bakary Sidibé Assitan Diakité Safiatou Doumbo Niaré Hassim Guindo Ahristode Akplogan Moudachirou Ibikounlé Jérôme Boissier Abdoulaye Dabo Department of Epidemiology of Infectious Diseases Faculty of PharmacyIRl 3189(USTTB/UCAD/UGB/CNRST/CNRS)University of SciencesTechniques and Technologies of BamakoBamakoMali Interactions Hôtes-Pathogènes-Environnements(IHPE) Univ.MontpellierCNRSIfremerUniv.Perpignan Via DomitiaPerpignanFrance Centre de Recherche pour la lutte contre les Maladies Infectieuses Tropicales(CReMIT/TIDRC) University of Abomey-CalaviAbomey CalaviBenin

Background Urogenital schistosomiasis is endemic in Mali and is a major cause of serious morbidity in large parts of the *** disease is responsible for many socio-economic and public health *** aim of this study was to investigate the impact of the disease on morbidity and to describe demographic and socioeconomic factors in relation to the status of children with urogenital schistosomiasis in *** We conducted a cross-sectional study in November 2021 of 971 children aged 6 to 14 years selected at random from six schools in three districts in the Kayes Region of *** and socioeconomic data were collected on survey *** data were collected following a medical *** was systematically searched for through the use of *** search for Schistosoma haematobium eggs in urine was done via the filtration *** urinary tract was examined by *** between each of these variables and disease infection were tested using multivariate logistic *** The overall prevalence of urinary schistosomiasis detected was 50.2%.The average intensity of infection was 36 eggs/10 ml of *** associated risk factors for urogenital schistosomiasis showed that children who bathed,used the river/pond as a domestic water source,and who habitually urinated in the river/pond were more affected(P<0.05).Children with farming parents were most affected(P=0.032).The collection of clinical signs revealed that boys had more pollakiuria(58.6%)and dysuria(46.4%)than *** data showed that focal lesion rates were recorded in all villages with the lowest rate in Diakalel(56.1%).Ultrasound and parasitological findings showed that irregularity and thickening were strongly associated with urinary schistosomiasis(P<0.0001).Conclusions Schistosoma haematobium infection was still endemic in the study site despite more than a decade of mass treatment with ***,the high percentage of symp

关键词： Schistosoma haematobium Morbidity Prevalence Risk factor Mali

用于大肠杆菌消毒的负载型和悬浮型TiO_2催化剂的动力学和催化效率（英文）

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催化学报 2014年第9期35卷 1571-1577页

作者： Majdi Kacem Gael Plantard Nathalie Wery Vincent Goetz National Center for Scientific Research UPR 8521 Laboratory of PROcess Materials and Solar Energy Tecnosud Rambla de la thermodynamique 66100 Perpignan France University of perpignan via domitia 52 Paul Alduy 66100 Perpignan France National Institute for Agricultural Research UR0050 Laboratory of Environmental Biotechnology Avenue des Etangs 11100 Narbonne France

TiO2‐mediated photocatalysis is widely used in a variety of applications and products in the envi‐ronmental and energy fields, including photoelectrochemical conversion, self‐cleaning surfaces, and especially water purification systems. The dimensionality of the structure of a TiO2 material can affect its properties, functions, and more specifically, its photocatalytic performance. In this work, the photocatalytic inactivation of Gram‐negative Escherichia coli using three photocatalysts, differ‐ing in their structure and other characteristics, was studied in a batch reactor under UVA light. The aim was to establish the disinfection efficiency of solid TiO2 compared with that of suspended cata‐lysts, widely considered as reference cases for photocatalytic water disinfection. The bacterial inac‐tivation profiles obtained showed that: (1) the photoinactivation was exclusively related to the quantity of photons retained per unit of treated volume, irrespective of the characteristics of the photocatalyst and the emitted light flux densities;(2) across the whole UV light range studied, each of the photocatalytic solids was able to achieve more than 2 log bacterial inactivation with less than 2 h UV irradiation;(3) none of the used catalysts achieved a total bacterial disinfection during the treatment time. For each of the catalysts the quantum yield has been assessed in terms of disinfec‐tion efficiency, the 2D material showed almost the same performance as those of suspended cata‐lysts. This catalyst is promising for supported photocatalysis applications.

关键词：二氧化钛催化剂大肠杆菌杀菌效率悬浮动力学光催化性能显示间歇式反应器

冲绳海槽中部距今近70ka以来的孢粉记录及物源探讨

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海洋学报 2011年第3期33卷 103-113页

作者：杨士雄郑卓魏金辉邓韫 JEAN-PIERRE Suc SERGE Berne 李杰中山大学地球科学系广东广州510275 Institut des Sciences de la Terre Paris Universite P.et M Curic-Paris675005ParisFrance universite de perpignan via domitia 66860 PerpignanFrance

研究钻孔DGKS-9602位于冲绳海槽中部,岩芯长度为931 cm,钻孔年代覆盖了氧同位素1～4阶段,年代可追溯至距今73 ka。孢粉分析结果证明,孢粉带与氧同位素阶段有较好的对应关系,其中松属花粉与蒿属花粉比值(P/A)与海平面变化曲线相互吻合。... 详细信息

研究钻孔DGKS-9602位于冲绳海槽中部,岩芯长度为931 cm,钻孔年代覆盖了氧同位素1～4阶段,年代可追溯至距今73 ka。孢粉分析结果证明,孢粉带与氧同位素阶段有较好的对应关系,其中松属花粉与蒿属花粉比值(P/A)与海平面变化曲线相互吻合。应用非相似性类比法将钻孔孢粉样品与陆地表土孢粉样品进行欧氏距离计算,从而获得陆源物质来源的可能区域,进而分析了海平面波动下导致陆源区发生的可能变化。结果证明在MIS 4～3阶段和全新世均以松属花粉为主,其类比分析结果表明,它们与现代陆地样点孢粉组合的相似度都较差,反映了分散的陆地来源和风力搬运为主导。而在末次盛冰期阶段,孢粉中的松属与蒿属的比值急剧下降至小于1,类比结果显示该段陆源物质很可能来自于盛冰期出露的大陆架平原,且以草地-湿地植被为主,该阶段海槽的离岸距离大为缩短,河流输入导致陆源物质通量增加。研究表明在冰期-间冰期时间尺度上,中国东部海岸带与冲绳海槽之间的离岸距离变化是制约陆源孢粉物质通量变化和搬运介质改变的主要因素。为更好地理解海洋沉积物孢粉的物质的来源以及解释复杂的古植被和古气候信息奠定了基础。

关键词：冲绳海槽孢粉分析古植被海平面变化孢粉物源

Modeling and Numerical Simulation of Heat Transfers in a Metallic Pressure Cooker Isolated with Kapok Wool

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Modeling and Numerical Simulation of Material Science 2020年第2期10卷 15-30页

作者： Drissa Ouedraogo Serge Wendsida Igo Gael Lassina Sawadogo Abdoulaye Compaore Belkacem Zeghmati Xavier Chesneau Laboratoire d’Energies Thermiques Renouvelables(LETRE) Universite Joseph KI-ZERBOOuagadougouBurkina Faso Departement Energie Institut de Recherche en Sciences Appliquees et Technologies(IRSAT/CNRST)OuagadougouBurkina Faso Laboratoire de Mathematiques et Physique(LAMPS) Universite de Perpignan Via DomitiaPerpignanFrance

In this work, a numerical study of heat transfers in a metallic pressure cooker isolated with kapok wool was carried out. This equipment works like a thermos, allowing finishing cooking meals only thanks to the heat stored at the beginning of cooking, which generates energy savings. Cooked meals are also kept hot for long hours. In our previous work, we have highlighted the performances of the pressure cooker when making common dishes in Burkina Faso. Also, the parameters (thickness and density) of the insulating matrix allowing having such performances as well as the influence of the climatic conditions on the pressure cooker operation were analyzed in detail in this present work. The numerical methodology is based on the nodal method and the transfer equations obtained by making an energy balance on each node have been discretized using an implicit scheme with finite differences and resolved by the Gauss algorithm. Numerical results validated experimentally show that the thickness of the kapok wool as well as its density play an important role in the pressure cooker operation. In addition, equipment performances are very little influenced by the weather conditions of the city of Ouagadougou (Burkina Faso).

关键词： Pressure Cooker Kapok Wool Heat Transfers Modeling Nodal Method

Experimental Study of a Metallic Pressure Cooker Insulated with Kapok Wool

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Energy and Power Engineering 2020年第2期12卷 73-87页

作者： Drissa Ouedraogo Serge Wendsida Igo Abdoulaye Compaore Gael Lassina Sawadogo Belkacem Zeghmati Xavier Chesneau Laboratoire d’Energies Thermiques Renouvelables(LETRE) Universite Joseph KI-ZERBOOuagadougouBurkina Faso Departement Energie Institut de Recherche en Sciences Appliquées et Technologies(IRSAT/CNRST)OuagadougouBurkina Faso Laboratoire de Mathématiques et Physique(LAMPS) Universite de Perpignan Via DomitiaPerpignanFrance

This work is devoted to an experimental study of metallic pressure cooker insulated with kapok wool, a vegetal biodegradable fiber. Experiments conducted on the cooling of hot water in the equipment revealed very low heat losses and a time constant of 60 hours on average. As a result, the equipment makes it possible to finish cooking meals only thanks to the heat stored at the beginning of cooking and keeps cooked dishes warm for long hours. The thermal phase shift of the pressure cooker is around 7?h. Cooking tests conducted on some local dishes revealed about 70% butane gas savings for cooking cowpea and white rice, 38% for cooking fatty rice, 75% for pasta and couscous, and 30% for cooking potato stew. These results show that this technology can contribute to minimizing?energy consumption in the restaurant sector.

关键词： Pressure Cooker Kapok Wool Time Constant Energy Saving Restaurant Sector

Experimental and Numerical Study of Energy Losses in a Barbecue Oven in Burkina Faso

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Open Journal of Energy Efficiency 2020年第1期9卷 31-52页

作者： Gael Lassina Sawadogo Laboratoire d’Energies Thermiques Renouvelables(LETRE) Universite Pr Joseph KI-ZERBOOuagadougouBurkina Faso Departement Energie Institut de Recherche en Sciences Appliquees et Technologies(IRSAT)OuagadougouBurkina Faso Laboratoire de Mathematiques et Physique(LAMPS) Universite de Perpignan Via Domitia(France)PerpignanFrance

This work concerns an experimental and numerical study of energy losses in a typical oven usually used in the agro-food craft sector in Burkina Faso. The experimental results were obtained by infrared thermography of the oven and by monitoring the evolution of the wall temperatures using thermocouples connected to a data acquisition system. These results indicate that the energy losses are mainly through the walls of the oven. The numerical study based on the energy balance and corroborated by the experimental study made it possible to quantify these losses of energy which represents almost half of the fuel used. These results will allow us to work on a new, more efficient oven model for the grilling sector in Burkina Faso.

关键词： Grill Oven Optimization Energy Losses Nodal Method