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Search Results: 1 - 10 of 586779 matches for " A N’guetta "
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Evolution des populations de Bemisia tabaci Genn. selon les variétés de tomate (Solanum lycopersicum L.) au Centre de la C te d’Ivoire
J Nzi, C Kouamé, A Nguetta, L Fondio, A Djidji, A Sangare
Sciences & Nature , 2010,
Abstract: La mouche blanche, (Bemisia tabaci Genn.), est le vecteur de la sévère maladie de l’enroulement jaunissant des feuilles de la tomate (TYLC) qui limite considérablement sa production. Le r le que joue cette culture, en tant que réservoir de B. tabaci a été déterminé par le dénombrement des populations de l’insecte, à la Station de Recherche sur les Cultures Vivrières du Centre National de Recherche Agronomique à Bouaké, de décembre 2000 à février 2002. Cinq variétés de tomate, dont un témoin local (ABBA), deux variétés tolérantes au TYLC (CLN2116B et CLN2123A) et deux variétés sensibles (IDSA108 et IDSA109), ont été évaluées à travers six essais sans traitements phytosanitaires. Ces variétés ont toutes hébergé des adultes et des larves de B. tabaci. Le semis de juin 2001 a enregistré le plus faible effectif avec une larve et deux adultes, tandis que celui de décembre 2000 a connu plus de prolifération de B. tabaci avec six larves et six adultes. Le témoin local a enregistré le plus faible effectif de B. tabaci et le plus faible pourcentage de plants contaminés comparativement aux autres variétés et peut par conséquent être utilisé dans des travaux ultérieurs de sélection. Mots clés: Tomate, Solanum lycopersicum, enroulement jaunissant, Bemisia tabaci, mouche blanche, C te d’Ivoire.
Etude par les isozymes de la pollinisation libre de génotypes d'hévéas sauvages (Hevea brasiliensis Muell. Arg.) en verger à graines
Lidah YJ.,N'Guetta ASP.,Fanjavola M.,Clément-Demange A.
Biotechnologie, Agronomie, Société et Environnement , 2006,
Abstract: Survey of the open pollination by isozymes in a wild rubber trees (Hevea brasiliensis Muell. Arg.) seeds orchard. The C te d Ivoire has a wild rubber tree population for which an improvement in a seeds orchard is suggested by open pollination. The isozymes markers (5 loci) were applied to study the open pollination in a rubber tree seed orchard in 1998 and 1999. The results confirmed the allogamic character of the rubber tree. On the period of the survey (1998 and 1999), the outcrossing rate estimated to 0.97 and 0.96 varies weakly between the two years. The high level of the outcrossing rate show that pollinations are realized between trees of different genotypes. The fixation index (FIS) decrease from the parental population to the descendant s one where it is not significantly different from zero. So crossings are panmictics, and the fertilizations between the related trees are practically inexistent. The rate of self-fertilization is mostly due to the real self-fertilizations between the ovuls and the pollen coming from the same origin. Thus, considering the results, the pollination in the seeds orchard would be favorable to the realization of substantial genetic progress in the wild rubber trees population.
A new scoring system to stratify risk in unstable angina
Alfredo C Piombo, Juan A Gagliardi, Javier Guetta, Juan Fuselli, Simón Salzberg, Enrique Fairman, Carlos Bertolasi
BMC Cardiovascular Disorders , 2003, DOI: 10.1186/1471-2261-3-8
Abstract: In a first phase, 473 patients were prospectively analyzed to determine which factors were significantly associated with the in-hospital occurrence of refractory ischemia, acute myocardial infarction (AMI) or death. A risk score ranging from 0 to 10 points was developed using a multivariate analysis. In a second phase, such score was validated in a new sample of 242 patients and it was finally applied to the entire population (n = 715).ST-segment deviation on the electrocardiogram, age ≥ 70 years, previous bypass surgery and troponin T ≥ 0.1 ng/mL were found as independent prognostic variables. A clear distinction was shown among categories of low, intermediate and high risk, defined according to the risk score. The incidence of the triple end-point was 6 %, 19.2 % and 44.7 % respectively, and the figures for AMI or death were 2 %, 11.4 % and 27.6 % respectively (p < 0.001).This new scoring system is simple and easy to achieve. It allows a very good stratification of risk in patients having a clinical diagnosis of UA. They may be divided in three categories, which could be of help in the decision-making process.Unstable angina (UA) is a complex syndrome with many different clinical presentations which share a common pathophysiologic background [1,2]. Plaque rupture or erosion, platelet activation, coronary spasm, thrombosis and oxygen supply/demand imbalance are well known mechanisms responsible for the diverse manifestations of the disease [3]. Prognosis of patients admitted to coronary care units with the clinical diagnosis of UA has strikingly improved in the last decades, but the spectrum of outcomes among different patients continues to be broad. There is general agreement that risk stratification is mandatory in this population and many markers of increased risk of serious events have been described over time [4-10].Refractory angina seems to be the strongest predictor of acute myocardial infarction or death, but this marker is not available at admission, prev
Registro multicéntrico de disección aórtica aguda: Estudio RADAR. Resultados preliminares
Higa,Claudio; Guetta,Javier; Borracci,Raúl A.; Meribilhaa,Raúl; Marturano,Maríaa; Marenchino,Ricardo; Benzadón,Mariano; Comignani,Pablo; Bastianelli,Gustavo; Fuselli,Juan José;
Revista argentina de cardiolog?-a , 2009,
Abstract: background acute aortic syndrome (aas) still represents one of the most severe cardiovascular conditions due to its high mortality and morbidity; for this reason, it is extremely important to perform an early diagnosis of the disease. objectives the registro de la sociedad argentina de cardiología de disecciones aórticas agudas (radar registry) was designed to analyze the modalities of clinical presentation, diagnosis, treatment and mortality of aas through a continuous registry of this not very prevalent disease. material and methods from february 2007 to april 2009, 95 patients consecutively admitted to 12 centers with a diagnosis of aas were enrolled; basal clinical characteristics, complementary studies, type of treatment and clinical outcomes were obtained. results most patients were men (68%), mean age was 58.8±13.9 years, 78% were type a aortic dissections and 22% were type b. eighty four percent of patients had hypertension, 28% were current smokers and 24% had dyslipemia. chest pain or dorsal pain was present in 85.1% of cases. global median time interval from onset of symptoms to intervention was 18 hours (12-72). surgery was performed in 89% of type a and in 15% of type b dissections. beta blockers were used in 64.7% of cases, sodium nitroprusside in 47.4%, aspirin in 15.8%, oral anticoagulant agents in 3.2% and thrombolytic drugs in 3.2%. global mortality was 32.6%. mortality rate of type a dissection was 37.8% (31% in patients undergoing surgery versus 87.5% in absence of surgical treatment; p=0.01). dissection type b had mortality rates of 14% versus 12%, respectively (p=ns). a pattern of circadian variation regarding onset of symptoms was observed, with a peak in the morning hours. logistic regression analysis showed that the independent variables associated with in-hospital mortality were age >70 years and the presence of hypotension or shock at admission. conclusions mortality from aas is still high despite technical progress. physicians should be a
Molecular Characterization and Prevalence of Trypanosoma Species in Cattle from a Northern Livestock Area in Côte d’Ivoire  [PDF]
Isidore Kpandji Kouadio, Didier Sokouri, Mathurin Koffi, Ibrahim Konaté, Bernadin Ahouty, Alain Koffi, Simon Pierre NGuetta
Open Journal of Veterinary Medicine (OJVM) , 2014, DOI: 10.4236/ojvm.2014.412038
Abstract: Background: African animal trypanosomiasis (AAT) is caused mainly by Trypanosoma congolense, T. vivax, and T. brucei brucei and is the major constraint for livestock productivity in Sub-Saharan African countries. Information about animal trypanosomiasis status in Ivory Coast is missing, especially regarding molecular epidemiology. Therefore, this study intended to apply molecular tools to identify and characterize trypanosomes in Ivory Coast for sustainable control. Methods: 363 cattle blood samples were collected from Ferkessedougou Region in northern Ivory Coast in 2012. Buffy coat technique (BCT) and species-specific PCR assays were used to detect trypanosome species. Results: Out of 363 cattle examined with BCT, 33 were found positive with all trypanosomes species accounting for an average of 9.09% prevalence whereas polymerase chain reaction (PCR) using species-specific primers showed that 81 out of 363 cattle were infected with trypanosomes with an overall prevalence of 22.31%. Trypanosoma congolense savanah type, T. Vivax and T. brucei sl. accounted for 28.39%, 49.38% and 23.45% of the infection rate respectively. No infection with T. congo forest type was detected. T. vivax infection was the most prevalence in the area investigated compared to the two other trypanosome species. Mixed infections with different trypanosomes species were detected accounting for 7.32% of prevalence. Regarding sexrelated prevalence, male cattles were slightly more infected than female but the difference was not significant. Conclusion: Our results showed that there was a high prevalence of AAT in livestock in Ferkessedougou Area. There is therefore a need to strengthen control policies and institute measures that help prevent the spread of the parasites for sustainable control of animal trypanosome in this area.
TeV Neutrinos from Galactic Microquasar Jets
D. Guetta,C. Distefano,A. Levinson,E. Waxman
Physics , 2002,
Abstract: We discuss the possibility that microquasar jets may be powerful emitters of TeV neutrinos. We estimate the neutrino fluxes produced by photopion production in the jets of a sample of identified microquasars and microquasar candidates, for which available data enables rough determination of the jet parameters. We demonstrate that in several of the sources considered, the neutrino flux at Earth, produced in events similar to those observed, can exceed the detection threshold of a km^2 neutrino detector. Sources with bulk Lorentz factors larger than those characteristic of the sample considered here, directed along our line of sight may be very difficult to resolve at radio wavelengths and hence may be difficult to identify as microqusar candidates. However these sources can be identified through their neutrino and gamma-ray emission.
Internal Shocks and the Blazar Sequence
D. Guetta,G. Ghisellini,D. Lazzati,A. Celotti
Physics , 2002,
Abstract: We consider the internal shock model as the dissipation mechanism responsible for the emission in blazars. It has been shown that this model is successful in reproducing the observed spectral energy distribution and the variability properties of a powerful blazar like 3C 279. However, the blazar family covers a wide range of spectral characteristics which appear to be correlated and the whole class can be seen as a sequence: the frequency and the intensity of the low energy versus high energy peak intensity increase with decreasing luminosity. We show that the internal shock model can satisfactorily account also for the properties of the low power blazars like BL Lac and Mkn 421 and it is successful in reproducing the blazar sequence.
Neutrino flux predictions for known Galactic microquasars
C. Distefano,D. Guetta,E. Waxman,A. Levinson
Physics , 2002, DOI: 10.1086/341144
Abstract: It has been proposed recently that Galactic microquasars may be prodigious emitters of TeV neutrinos that can be detected by upcoming km^2 neutrino telescopes. In this paper we consider a sample of identified microquasars and microquasar candiates, for which available data enables rough determination of the jet parameters. By employing the parameters inferred from radio observations of various jet ejection events, we determine the neutrino fluxes that should have been produced during these events by photopion production in the jet. Despite the large uncertainties in our analysis, we demonstrate that in several of the sources considered, the neutrino flux at Earth, produced in events similar to those observed, would exceed the detection threshold of a km^2 neutrino detector. The class of microquasars may contain also sources with bulk Lorentz factors larger than those characteristic of the sample considered here, directed along our line of sight. Such sources, which may be very difficult to resolve at radio wavelengths and hence may be difficult to identify as microqusar candidates, may emit neutrinos with fluxes significantly larger than typically obtained in the present analysis. These sources may eventually be identified through their neutrino and gamma-ray emission.
QBC ParaLens TM LED fluorescent microscope attachment with QBC F.A.S.T.TM AFB staining system  [PDF]
Kouassi N’Guessan, Brian Joseph Hnatkovich, NGuetta Aka, Armand Achy-Brou, Bakary Coulibaly, Jean Marc Assande, Philomène Mohoudi, Mireille Dosso
Journal of Tuberculosis Research (JTR) , 2013, DOI: 10.4236/jtr.2013.13008
Abstract: This study was designed to evaluate the QBC ParaLensTM LED fluorescent microscope attachment and the QBC F.A.S.T.TM AFB staining system for the detection of Acid Fast Bacilli in pathological samples in Abidjan, Cote d’Ivoire. A total of 50 patients were tested using direct smear specimens with both Ziehl-Neelsen (ZN) light microscopy and LED fluorescence microscopy with QBC F.A.S.T. AFB stain. The samples were also cultured and tested using an immunochromatograpic test for detection of antigen MPT 64 and the results were compared to direct examination. ZN light microscopy detected 20 positive cases and LED fluorescent microscopy with QBC F.A.S.T. AFB stain detected 21. The sensitivity and specificity of ZN light microscopy was determined to be 84.2% and 87.1% respectively. The sensitivity and specificity of LED fluorescent microscopy with QBC F.A.S.T. AFB stain was determined to be 94.7% and 90.3% respectively. Compared to ZN light microscopy, LED fluorescent microscopy with QBC F.A.S.T. AFB stain increased the sensitivity of direct examination without concentration by 10.5%.
Temps et narration dans la littérature israélienne Time and Narration in Israeli Literature
Alessandro Guetta
Yod : Revue des études Hébra?ques et Juives , 2011, DOI: 10.4000/yod.336
Abstract: Cet article est une interprétation de la crise contemporaine du roman classique comme une difficulté à faire face à l'accélération constante de l'expérience subjective du temps. J’analyse la réaction de deux groupes d'écrivains israéliens à cette crise esthétique : un premier groupe (AB Yehoshua, Yitzhaq Laor et d'autres) ralentit le rythme narratif afin de saisir des détails du monde qui l'entoure, ces détails qui autrement échappent à la capacité de description des auteurs. Un deuxième groupe de jeunes auteurs (Orly Castel Bloom, Etgar Keret) qui a abandonné l'ambition de ma triser le monde typique du roman classique, et se contente d'une littérature de fragments, apparemment glissant à la surface des choses, sans trame précise et avec une description des personnages qui semble superficielle. This article is an interpretation of the contemporary crisis of the classical novel as a difficulty to face the steady acceleration of the subjective experience of time. I analyze the reactions of two groups of Israeli writers to this aesthetic crisis: a first group (A. B. Yehoshua, Yitzhaq Laor and others) slow down the narrative rhythm in order to grasp details of the surrounding world, otherwise escaping to the writer's capacity of description. A second group of younger authors (Orly Castel Bloom, Etgar Keret) give up the ambition of mastering the world typical of the classical novel, and content themselves with a literature of fragments, apparently gliding at the surface of things, without a precise and organic plot and apparently superficial description of characters. . : , . . , ', . , , , .
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