987 resultados para TS Manufacturas


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Yaʿaḳov Dinezon

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Digitalisat der Ausg. Ṿilne, 1927

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ts1 is a neurovirulent spontaneous temperature-sensitive mutant of Moloney murine leukemia virus TB (MoMuLV-TB). MoMuLV-TB causes T-cell lymphoma or lymphoid leukemia in mice after a long latency period whereas ts1 causes a progressive hindlimb paralytic disease after a much shorter latency period. In previous studies, it had been shown that the temperature-sensitive defect resided in the $env$ gene. At the restrictive temperature, the envelope precursor polyprotein, gPr80$\sp{env}$, is inefficiently processed intracellularly into a heterodimer consisting of two cleavage products, gp70 and Prp15E. This inefficient processing is correlated with neurovirulence. In this study, the nucleotide sequences of the env genes for both ts1 and MoMuLV-TB were determined, and the encoded amino acid sequences were deduced from the DNA sequences. There were four unique amino acid substitutions in the gPr80$\sp{env}$ of ts1. In order to determine which unique amino acid was responsible for the phenotypic characteristics of ts1, a set of hybrid genomes was constructed by exchanging restriction fragments between ts1 and MoMuLV-TB. NIH 3T3 cells were transfected with the hybrid genomes to obtain infectious hybrid viruses. Assays of the hybrid viruses showed that a Val-25$\to$Ile substitution in gPr80$\sp{env}$ was responsible for the temperature sensitivity, inefficient processing, and neurovirulence of ts1. In further studies, the Ile-25 in gPr80$\sp{env}$ was substituted with Thr, Ala, Leu, Gly, and Glu by site-directed mutagenesis to generate a new set of mutant viruses, i.e., ts1-T, -A, -L, -G, and -E, respectively. The rank order of the mutants for temperature sensitivity was: ts1-E $>$ ts1-G $>$ ts1-L $>$ ts1-A $>$ ts1 $>$ ts1-T. The degree of temperature sensitivity of each of the mutants also correlated with the degree of inefficient processing of gPr80$\sp{env}$. The mutant viruses were assayed for neurovirulence. ts1-T caused whole body tremor, ts1-A caused hindlimb paralysis, ts1-L caused paraparesis, but ts1-G and -E were not neurovirulent. These results show that inefficient processing of gPr80$\sp{env}$ is correlated with neurovirulence, but if processing of gPr80$\sp{env}$ is too inefficient there is no neurovirulence. Furthermore, the disease profile of each of the neurovirulent viruses depends on the degree of inefficient processing of gPr80$\sp{env}$. ^

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Geological storage of CO2 that has been captured at large, point source emitters represents a key potential method for reduction of anthropogenic greenhouse gas emissions. However, this technology will only be viable if it can be guaranteed that injected CO2 will remain trapped in the subsurface for thousands of years or more. A signi?cant issue for storage security is the geomechanical response of the reservoir. Concerns have been raised that geomechanical deformation induced by CO2 injection will create or reactivate fracture networks in the sealing caprocks, providing a pathway for CO2 leakage. In this paper, we examine three large-scale sites where CO2 is injected at rates of ab. 1 megatonne/y or more: Sleipner, Weyburn, and In Salah. We compare and contrast the observed geomechanical behavior of each site, with particular focus on the risks to storage security posed by geomechanical deformation. At Sleipner, the large, high-permeability storage aquifer has experienced little pore pressure increase over 15 y of injection, implying little possibility of geomechanical deformation. At Weyburn, 45 y of oil production has depleted pore pressures before increases associated with CO2 injection. The long history of the ?eld has led to complicated, sometimes nonintuitive geomechanical deformation. At In Salah, injection into the water leg of a gas reservoir has increased pore pressures, leading to uplift and substantial microseismic activity. The differences in the geomechanical responses of these sites emphasize the need for systematic geomechanical appraisal before injection in any potential storage site.

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Hay un ejemplar encuadernado con: La Real Compañia formada por S.M. para llevar a efecto el canal de navegación y riego del reyno de Murcia, las... experiencias de que informa D. Domingo Aguirre... le han confirmado en los abusos y fraudes que hacen muchos... (XVIII/4279).

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El contexto actual exige a las organizaciones un proyecto empresarial orientado a la Prevención de Riesgos Laborales (PRL); en el cual cobren cada vez mayor importancia el factor humano, la cultura organizacional y preventiva, las actitudes y comportamientos de los trabajadores; contribuyendo así a una eficaz Gestión de la Prevención. Por tanto, si las empresas desean lograr una verdadera integración de la PRL, deben considerar la conducta de los trabajadores y comprender que la mejor medida preventiva para evitar los riesgos laborales es ir más allá de las causas básicas y establecer una cultura preventiva que sea compartida por todos y contemple que el conocer las actitudes de los trabajadores hacia la PRL es la mejor vía para predecir y modificar la conducta. En este sentido, desde el diseño del proyecto empresarial las organizaciones deben considerar la planificación de la prevención, la evaluación inicial de los riesgos y su actualización, las medidas preventivas de los mismos, la información y formación de los trabajadores sobre los riesgos y forma de prevenirlos, entre otros aspectos de seguridad y salud laboral, como parte de sus objetivos estratégicos que deben desarrollar. Así pues, el objetivo de esta investigación es analizar la influencia de una Cultura Organizacional Integral sobre las Actitudes hacia la Prevención de Riesgos Laborales y los Comportamientos Seguros de los Trabajadores en Empresas de Manufactura en España. En este sentido, el alcance del estudio comprendió dos empresas (Empresa A y Empresa B), seleccionadas intencionalmente, del Sector de Manufactura en España, específicamente en la ciudad de Salamanca. En ambas empresas se aplicaron dos instrumentos; uno orientado a los trabajadores o empleados y otro a los supervisores, mandos intermedios y líderes en SSL; los cuales son explicados en el marco metodológico. La Unidad de Análisis estuvo definida por 110 trabajadores y 25 directivos, quienes a su vez conformaron la población objeto de estudio. En cuanto al manejo de las variables el diseño de la investigación fue No Experimental, de tipo transeccional o transversal; con un tipo de estudio Descriptivo y Explicativo...

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A series of modified TS-1 samples have been produced by desilication of the original TS-1 (4 wt.% Ti) using a chemical treatment with NaOH. Desilicated TS-1 zeolites exhibit a large BET surface area together with a well-developed mesoporosity. The hierarchical catalysts from desilication of TS-1 zeolite show a good catalytic activity for the oxidation of small molecules and a significantly higher activity for the oxidation of bulky molecules.