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Search Results: 1 - 10 of 366530 matches for " Ana?s Charles Nelson "
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Treatment for Stable Coronary Artery Disease: A Network Meta-Analysis of Cost-Effectiveness Studies
Thibaut Caruba, Sandrine Katsahian, Catherine Schramm, Anas Charles Nelson, Pierre Durieux, Dominique Bégué, Yves Juillière, Olivier Dubourg, Nicolas Danchin, Brigitte Sabatier
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0098371
Abstract: Introduction and Objectives Numerous studies have assessed cost-effectiveness of different treatment modalities for stable angina. Direct comparisons, however, are uncommon. We therefore set out to compare the efficacy and mean cost per patient after 1 and 3 years of follow-up, of the following treatments as assessed in randomized controlled trials (RCT): medical therapy (MT), percutaneous coronary intervention (PCI) without stent (PTCA), with bare-metal stent (BMS), with drug-eluting stent (DES), and elective coronary artery bypass graft (CABG). Methods RCT comparing at least two of the five treatments and reporting clinical and cost data were identified by a systematic search. Clinical end-points were mortality and myocardial infarction (MI). The costs described in the different trials were standardized and expressed in US $ 2008, based on purchasing power parity. A network meta-analysis was used to compare costs. Results Fifteen RCT were selected. Mortality and MI rates were similar in the five treatment groups both for 1-year and 3-year follow-up. Weighted cost per patient however differed markedly for the five treatment modalities, at both one year and three years (P<0.0001). MT was the least expensive treatment modality: US $3069 and 13 864 after one and three years of follow-up, while CABG was the most costly: US $27 003 and 28 670 after one and three years. PCI, whether with plain balloon, BMS or DES came in between, but was closer to the costs of CABG. Conclusions Appreciable savings in health expenditures can be achieved by using MT in the management of patients with stable angina.
Parameters protéicosdel seminal plasma and his relation with the quality of the semen in bulls of the race nelore (bos taurus indicus) Parámetros protéicosdel plasma seminal y su relación con la calidad del semen en toros de la raza nelore (bos taurus indicus)
Ana Sánchez,Marcelo Mungai,Nelson Machado
Cultura Científica , 2006,
Abstract: The purpose of this study was to investigate the presence and incidence of specific protein bands onthe Nelore bulls' seminal plasma, fit for reproductive activity complete or partially. There were used 68 samples; 20 of the Census and 48 of the Blunt variety, with an average age of 4 years. In the scrotum perimeter (35,05 ± 0,49 cm and 33,30 ± 0,39 cm),corporal mass index (302,62 ± 5,87 and 284,19 ±5,15 Kg|m2) there was difference (p < 0,05) between the Census and Blunt varieties respectively. With regard to corporal weight (627,70 ± 11,37 and 611,58 ± 8,66 kg); height (1,44 ± 0,01e 1,47 ±0,01m); ejaculation volume (5,82 ± 0,48 and 5,17± 0,29 mL), progressive spermatic motility (73,50 ±2,81% and 75,62 ± 0,97%), spermatic vigor (4,30 ±0,19 and 4,27 ± 0,11) and mass motility (4,27 ±0,11 and 3,33 ± 0,23) there was no difference (p>0,05). In spermatic morphology, neither was there inequality between Census and Blunt varieties, with 5,06 ± 8,20% and 5,32 ± 6,40% of mayor defects respectively; 9,91 ± 6,74% and 8,36 ±6,06% for the minor defects; and 14,76 ± 13,20% and 13,82 ± 12,61% for total defects. The electro phoresis of the seminal plasma revealed protein bands with weights between 5 and 105 KDa. In 100% of bulls fit for reproduction, there was found protein with a weight of 13 Kda, as well as bands of 20 KDa.The other protein bands showed their presence with different incidence percentages in bulls totally orpartially fit for reproductive activity. Both of the studied varieties made evident the effective reproductive adaptation under similar climate conditions. El propósito de este estudio fue investigar la presenciae incidencia de bandas proteicas específicas delplasma seminal en toros Nelore, completa y parcialmente aptos para la actividad reproductiva. Se utilizaron 68 ejemplares; 20 de variedad Padrón y 48 Mochos, con edad media de 4 a os. En el perímetro escrotal (35,05±0,49 cm e 33,30±0,39cm), índice de masa corpórea (302,62±5,87 e 284,19±5,15Kg|m2 ) hubo diferencia (p<0,05) entre las variedades Padrón y Mocho, respectivamente. Con respecto al peso corpóreo (627,70±11,37 e 611,58±8,66Kg); la altura (1,44±0,01e 1,47±0,01m); el volumen del eyaculado (5,82±0,48 e 5,17±0,29 mL), la motilidad espermática progresiva (73,50±2,81% e75,62±0,97%), el vigor espermático (4,30±0,19 e4,27±0,11) y motilidad en masa (4,27±0,11 e3,33±0,23) no se presentó diferencia (p>0,05). En morfología espermática, tampoco hubo desigualdad entre las variedades Padrón y Mocho, respectivamente con 5,06 ± 8,20% e 5,32 ± 6,40% de defectos mayores; 9,91±6,74% e 8,36±6,06% para los d
Introduction to Subatomic-Particle Spectrometers
Daniel M. Kaplan,Charles. E. Lane,Kenneth S. Nelson
Physics , 1998,
Abstract: An introductory review, suitable for the beginning student of high-energy physics or professionals from other fields who may desire familiarity with subatomic-particle detection techniques. Subatomic-particle fundamentals and the basics of particle interactions with matter are summarized, after which we review particle detectors. We conclude with three examples that illustrate the variety of subatomic-particle spectrometers and exemplify the combined use of several detection techniques to characterize interaction events more-or-less completely.
THE COMPLEXITY OF LANGUAGE LEARNING
Charles Nelson
International Journal of Instruction , 2011,
Abstract: This paper takes a complexity theory approach to looking at language learning, an approach that investigates how language learners adapt to and interact with people and their environment. Based on interviews with four graduate students, it shows how complexity theory can help us understand both the situatedness of language learning and also commonalities across contexts by examining language learning through the lenses of emergence, distribution, and embodiment. These lenses underscore the perspective that language learning emerges from unique interactions, is distributed across social networks, and is embodied in individuals. Consequently, this paper concludes that it is not sufficient to study cognitive processes, activities, and situated learning alone; in addition, research must consider how learners’ interactions and adaptations are embodied, distributed, and emergent in ecologies of complex systems.
High Level of Pyrethroid Resistance in an Anopheles funestus Population of the Chokwe District in Mozambique
Nelson Cuamba,John C. Morgan,Helen Irving,Andrew Steven,Charles S. Wondji
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0011010
Abstract: Although Anopheles funestus is difficult to rear, it is crucial to analyse field populations of this malaria vector in order to successfully characterise mechanisms of insecticide resistance observed in this species in Africa. In this study we carried out a large-scale field collection and rearing of An. funestus from Mozambique in order to analyse its susceptibility status to insecticides and to broadly characterise the main resistance mechanisms involved in natural populations.
A survey of knowledge, attitudes and practice of emergency contraception among university students in Cameroon
Eugene J Kongnyuy, Pius Ngassa, Nelson Fomulu, Charles Wiysonge, Luc Kouam, Anderson S Doh
BMC Emergency Medicine , 2007, DOI: 10.1186/1471-227x-7-7
Abstract: A convenient sample of 700 students of the University of Buea (Cameroon) was selected for the study. Data was collected by a self-administered, anonymous and pre-tested questionnaire.The response rate was 94.9% (664/700). General level of awareness of emergency contraceptive pills was 63.0% (418/664). However, knowledge of the general features of emergency contraceptive pills was low and misinformation was high among these students. Knowledge differed according to the source of information: informal source was associated with misinformation, while medical and informational sources were associated with better knowledge. Although the students generally had positive attitudes regarding emergency contraceptive pills, up to 65.0% (465/664) believed that emergency contraceptive pills were unsafe. Those with adequate knowledge generally showed favourable attitudes with regards to emergency contraceptive pills (Mann-Whitney U = 2592.5, p = 0.000). Forty-nine students (7.4%) had used emergency contraceptive pills themselves or had a partner who had used them.Awareness of emergency contraception pills by Cameroonian students is low and the method is still underused. Strategies to promote use of emergency contraception should be focused on spreading accurate information through medical and informational sources, which have been found to be reliable and associated with good knowledge on emergency contraceptive pills.Emergency contraception (EC) is contraception administered after unprotected intercourse to prevent pregnancy. It is also known as "post-coital contraception", and is less effective than regular contraception. EC is intended for occasional or emergency use only and not as a regular contraception. It is associated with a failure rate of 0.2% to 3% [1]. There are various methods of emergency contraception. They include hormonal contraceptive pills (also called morning-after pills), intrauterine contraceptive devices and mifepristone. Formerly, emergency contraceptive
A Proper Motion Survey for White Dwarfs with the Wide Field Planetary Camera 2
Cailin A. Nelson,Kem H. Cook,Tim S. Axelrod,Jeremy R. Mould,Charles Alcock
Physics , 2001, DOI: 10.1086/340759
Abstract: We have performed a search for halo white dwarfs as high proper motion objects in a second epoch WFPC2 image of the Groth-Westphal strip. We identify 24 high proper motion objects with mu > 0.014 ''/yr. Five of these high proper motion objects are identified as strong white dwarf candidates on the basis of their position in a reduced proper motion diagram. We create a model of the Milky Way thin disk, thick disk and stellar halo and find that this sample of white dwarfs is clearly an excess above the < 2 detections expected from these known stellar populations. The origin of the excess signal is less clear. Possibly, the excess cannot be explained without invoking a fourth galactic component: a white dwarf dark halo. We present a statistical separation of our sample into the four components and estimate the corresponding local white dwarf densities using only the directly observable variables, V, V-I, and mu. For all Galactic models explored, our sample separates into about 3 disk white dwarfs and 2 halo white dwarfs. However, the further subdivision into the thin and thick disk and the stellar and dark halo, and the subsequent calculation of the local densities are sensitive to the input parameters of our model for each Galactic component. Using the lowest mean mass model for the dark halo we find a 7% white dwarf halo and six times the canonical value for the thin disk white dwarf density (at marginal statistical significance), but possible systematic errors due to uncertainty in the model parameters likely dominate these statistical error bars. The white dwarf halo can be reduced to around 1.5% of the halo dark matter by changing the initial mass function slightly. The local thin disk white dwarf density in our solution can be made consistent with the canonical value by assuming a larger thin disk scaleheight of 500 pc.
Diagrams and Parastatistical Factors for Cascade Emission of a Pair of Paraparticles
Charles A. Nelson,Margarita Kraynova,Calvin S. Mera,Alanna M. Shapiro
Physics , 2015,
Abstract: The empirical absence to date of particles obeying parastatistics in high energy collider experiments might be due to their large masses, weak scale couplings, and lack of gauge couplings. Paraparticles of order p=2 must be pair produced, so the lightest such particles are absolutely stable and so are excellent candidates to be associated with dark matter and/or dark energy. If there is a portal to such particles, from a new scalar A1 boson they might be cascade emitted as a pair of para-Majorana neutrinos as in A1 ---> A2 para-nu para-nu or as a pair of neutral spin-zero paraparticles such as in A1 ---> A2 para-A para-B, where para-B is the anti-paraparticle to para-A. In this paper, for an assumed supersymmetric-like "statistics portal" Lagrangian, the associated connected tree diagrams and their parastatistical factors are obtained for the case of order p=2 parastatistics. These factors are compared with the corresponding statistical factors for the analogous emission of a non-degenerate or a 2-fold degenerate pair which obey normal statistics. This shows that diagrams, and diagrammatic thinking, can be use in perturbatively analyzing paraparticle processes. The parastatistical factor associated with each diagram does require explicit calculation.
A New Kind of Weak-Coupling in Top-Quark Physics ?
Nelson, Charles A.
High Energy Physics - Phenomenology , 2008,
Abstract: In the standard model, for the t --> W b decay mode, the relative phase is 0-degrees between the dominant A(0,-1/2) and A(-1, -1/2) helicity amplitudes. However, in the case of an additional large t_R --> b_L chiral weak-transition moment, there is instead a 180-degree relative phase and three theoretical numerical puzzles. This phase can be measured at the Tevatron or LHC in top-antitop pair production by use of W-boson longitudinal-transverse interference in beam-referenced stage-two spin-correlation functions. Indeed, this is a new type of weak-coupling for it is directly associated with E_W, the W-boson energy in the top quark rest frame, instead of with a canonical effective mass scale. For most 2 --> 2 reactions, the simple off-shell continuation of this additional coupling is found to have good high energy properties, i.e. it does not destroy 1-loop unitarity of the SM. In a subset of processes, additional third-generation couplings are required.
Tests for Tau's Charged-Current Structure
Charles A. Nelson
Physics , 1995, DOI: 10.1016/0370-2693(95)00779-K
Abstract: The Lorentz structure of the tau lepton's charged-current can almost be completely determined by use of stage-two spin-correlation functions for the $\{\rho ^{-},\rho ^{+}\}$and $\{a_1^{-},a_1^{+}\}$ decay modes. It is possible to test for a ``$(V-A)$ $ + $ something'' structure in the ${J^{Charged}}_{Lepton}$ current, so as to bound the scales $\Lambda$ for ``new physics" such as arising from tau weak magnetism, weak electricity, and/or 2nd-class currents. In practice, only limited information can be obtained from the $\tau \rightarrow \pi \nu$ modes.
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