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Search Results: 1 - 10 of 201051 matches for " N; Fernandez "
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Campylobacter jejuni y Campylobacter coli en tres grupos de gallinas de diferente origen geográfico del sur de Chile
Archivos de medicina veterinaria , 2000, DOI: 10.4067/S0301-732X2000000200012
Abstract: in order to establish the prevalence of campylobacter jejuni and c. coli, 300 fecal samples obtained from hens in three different geographical places (loncoche, valdivia and puerto montt cities) from southern chile were studied. the prevalence of the thermotolerant species of campylobacter was 25.7%, being campylobacter jejuni isolated with a frequency of 76.6% and c. coli with 23.4%. only two of the four biotypes of c. jejuni were found, being biotype ii the most frequent one (68.8%). the two biotypes described for c. coli were isolated, and biotype ii was also the most frequent (68.8%).
Campylobacter jejuni y Campylobacter coli en tres grupos de gallinas de diferente origen geográfico del sur de Chile Occurrence of Campylobacter jejuni and Campylobacter coli in three groups of hens of different geographic origin in Southern Chile
Archivos de medicina veterinaria , 2000,
Abstract: Se estudiaron 300 muestras fecales de gallinas obtenidas en tres sitios geográficos del sur de Chile (comunas de Loncoche, Valdivia y Puerto Montt), para conocer la prevalencia de Campylobacter jejuni y de C. coli en estas aves consideradas como reservorio. La prevalencia de especies termotolerantes del género Campylobacter fue del 25,7%, siendo C. jejuni aislado con una frecuencia del 76,6% y la de C. coli del 23,4%. Fueron encontrados sólo 2 de los 4 biotipos de C. jejuni, siendo aislado el biotipo II con mayor frecuencia (68.8%). En C. coli fueron encontrados los 2 biotipos descritos para esta especie, siendo, también, el biotipo II el más frecuente In order to establish the prevalence of Campylobacter jejuni and C. coli, 300 fecal samples obtained from hens in three different geographical places (Loncoche, Valdivia and Puerto Montt cities) from Southern Chile were studied. The prevalence of the thermotolerant species of Campylobacter was 25.7%, being Campylobacter jejuni isolated with a frequency of 76.6% and C. coli with 23.4%. Only two of the four biotypes of C. jejuni were found, being biotype II the most frequent one (68.8%). The two biotypes described for C. coli were isolated, and biotype II was also the most frequent (68.8%).
Gas dynamics in the Milky Way: the nuclear bar and the 3-kpc arms
N. J. Rodriguez-Fernandez
Physics , 2009,
Abstract: We discuss the results of the first model of the gas dynamics in the Milky Way in the presence of two bars: the large scale primary bar or boxy bulge and a secondary bar in the Galactic center region. We have obtained an accurate potential by modeling 2MASS star counts and we have used this potential to simulate the gas dynamics. As a first approximation we have used one single pattern speed \Omega_p. The models with Omega_p=30-40 \kmskpc and a primary bar orientation of 20-35 deg reproduce successfully many characteristics of the observed longitude-velocity diagrams as the terminal velocity curve or the spiral arm tangent points. The Galactic Molecular Ring is not an actual ring but the inner part of the spiral arms, within corotation. The model reproduces quantitatively the "3-kpc arm" and the recently found far-side counterpart, which are the lateral arms that contour the bar. In the Galactic center region, the model reproduces the 1-kpc HI ring and the Central Molecular Zone (CMZ), which is the gas response to the secondary bar. In order to reproduce the observed parallelogram shape of the CO longitude velocity diagram of the CMZ, the secondary bar should be oriented by and angle of 60-70 deg with respect to the Sun-GC line. The mass of the secondary bar amounts to (2-5.5)10^9 Msun, which is 10-25 % of the mass of the primary bar.
Estimates for the Sobolev trace constant with critical exponent and applications
J. Fernandez Bonder,N. Saintier
Mathematics , 2006, DOI: 10.1007/s10231-007-0062-1
Abstract: In this paper we find estimates for the optimal constant in the critical Sobolev trace inequality $S\|u\|^p_{L^{p_*}(\partial\Omega) \hookrightarrow \|u\|^p_{W^{1,p}(\Omega)}$ that are independent of $\Omega$. This estimates generalized those of [3] for general $p$. Here $p_* := p(N-1)/(N-p)$ is the critical exponent for the immersion and $N$ is the space dimension. Then we apply our results first to prove existence of positive solutions to a nonlinear elliptic problem with a nonlinear boundary condition with critical growth on the boundary, generalizing the results of [16]. Finally, we study an optimal design problem with critical exponent.
Karl Polanyi, Athens and us: the contemporary significance of Polanyi's thought
Wjuniski, Bernardo Stuhlberger;Fernandez, Ramón G.;
Revista de Economia Política , 2010, DOI: 10.1590/S0101-31572010000300004
Abstract: karl polanyi is considered one of the most prominent social scientists of the 20th century. in his writings, an important concern was the relationship between the markets and the society (therefore, the state) as a whole; to discuss it, he introduced the concept of "embeddedness", fundamental for his study of the origins and consequences of the industrial revolution. an important part of his heritage is the study of the economic history of what he called "ancient societies," especially of classical greece. polanyi used these studies to compare the ancient societies with his own times, in an effort to understand them all. this paper aims to relate polanyi's work on the athenian society with his studies about the modern times, showing that it is possible to draw lessons from polanyi's thought on the relationship between the society, the state and the market that can help to design a political agenda for our days. in the first part, we present the most important aspects o the life and work of polanyi, and in the second we discuss the most important aspects of his worldview. then, in the third part, we study his view of the early athenian economy; mainly, we focus on the coexistence of a kind of state planning and a market, showing how this understanding is crucial for the whole polanyian legacy, with its emphasis in the comparison of different societies and times. we conclude by underlining the relevance of this interpretation advanced by polanyi to understand the societies of our days, focusing on some proposals to extend his approach to deal with our contemporary problems.
Probing student understanding of scientific thinking in the context of introductory astrophysics
Richard N. Steinberg,Sebastien Cormier,Adiel Fernandez
Physical Review Special Topics. Physics Education Research , 2009,
Abstract: Common forms of testing of student understanding of science content can be misleading about their understanding of the nature of scientific thinking. Observational astronomy integrated with related ideas of force and motion is a rich context to explore the correlation between student content knowledge and student understanding of the scientific thinking about that content. In this paper, we describe this correlation in detail with a focus on a question about the relative motion of the Sun and the Earth. We find that high achieving high school students throughout New York City struggle with what constitutes scientific justification and thought processes, but can improve these skills tremendously in an inquiry-oriented summer astronomy-physics program.
Airy Functions for Compact Lie Groups
Rahul N. Fernandez,V. S. Varadarajan
Physics , 2007,
Abstract: The classical Airy function has been generalised by Kontsevich to a function of a matrix argument, which is an integral over the space of (skew) hermitian matrices of a unitary-invariant exponential kernel. In this paper, the Kontsevich integral is generalised to integrals over the Lie algebra of an arbitrary connected compact Lie group, using exponential kernels invariant under the group. The (real) polynomial defining this kernel is said to have the Airy property if the integral defines a function of moderate growth. A general sufficient criterion for a polynomial to have the Airy property is given. It is shown that an invariant polynomial on the Lie algebra has the Airy property if its restriction to a Cartan subalgebra has the Airy property. This result is used to evaluate these invariant integrals completely and explicitly on the hermitian matrices, obtaining formulae that contain those of Kontsevich as special cases.
Polyconvex Model for Materials with Cubic Anisotropy
N. Kambouchev,J. Fernandez,R. Radovitzky
Physics , 2005,
Abstract: Polyconvexity is one of the known conditions which guarantee existence of solutions of boundary value problems in finite elasticity. In this work we propose a framework for development of polyconvex strain energy functions for hyperelastic materials with cubic anisotropy. The anisotropy is captured by a single fourth order structural tensor for which the minimal polynomial basis is identified and used for the formulation of the strain energy functions. After proving the polyconvexity of some polynomial terms, we proceed to propose a model based on a simple strain energy function. We investigate the behavior of the model analytically in one dimension and numerically in two and three dimensions. These investigations allow us conclude that the model possesses the physically relevant directional properties, in particular, strains in different directions are different and the lack of any loading symmetries leads to development of ``shear'' stresses and displacements.
Green Areas and Microscale Thermal Comfort in Arid Environments: A Case Study in Mendoza, Argentina  [PDF]
Salvador Enrique Puliafito, Fabián Rolando Bochaca, David Gabriel Allende, Rafael Fernandez
Atmospheric and Climate Sciences (ACS) , 2013, DOI: 10.4236/acs.2013.33039

A series of mobile and stationary meteorological measurements were performed in the city of Mendoza, Argentina to study the local influence of green areas on the urban canopy layer heat island effect at the micro scale, during the Austral summer of 2003-2005. These results were associated in representative local climate zones (LCZ), which helped to identify different thermal conditions within the city. The physiologically equivalent temperature index was used to determine the thermal comfort in each LCZ, showing that during daylight, trees and parks improve thermal comfort through shading and evapotranspiration; but at the same time, urban tree corridors delay night cooling by retaining warm air beneath their canopies. Also irrigation showed to positively influence on the extension and intensity of the cooling effect of rural areas and parks. The cooling influence of an urban park spreads out through the neighborhoods for 800 - 1000 m, with an average temperature decrease of 1.3°C during daytime and >4.0°C at nighttime.

Contextual Fear Extinction and Re-Extinction in Carioca High- and Low-Conditioned Freezing Rats  [PDF]
Vitor de Castro Gomes, Laura Andrea León, Daniel Mograbi, Fernando Cardenas, Jesus Landeira-Fernandez
World Journal of Neuroscience (WJNS) , 2014, DOI: 10.4236/wjns.2014.43028

We recently reported two novel breeding lines of rats known as Carioca High- and Low-conditioned Freezing (CHF and CLF), based on defensive freezing responses to contextual cues previously associated with electric footshock. The present study used animals of the 8th generation of our selective breeding program to investigate both contextual fear extinction and re-extinction. The results consistently showed that CHF animals froze more than CLF animals. Long extinction training was able to extinguish phenotypic differences between lines, but the divergence was restored after just one fear reacquisition training session. These differences disappeared again during re-extinction training. The possible neural mechanisms involved in these two types of learning are discussed.

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