990 resultados para clausula rebus sic stantibus


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This thesis poses two fundamental issues regarding Hegel's philosophy of intersubjectivity. Firstly, it examines Kojeve's problematic interpretation of Hegelian intersubjectivity as being solely rooted in the dialectic of lordship and bondage. It is my contention that Kojeve conflates the concepts of recognition {Anerkennung) with that of desire (Begierde), thereby reducing Hegel's philosophy of intersubjectivity to a violent reduction of the other to the same. This is so despite the plenary of examples Hegel uses to define intersubjectivity as the mutual (reciprocal) recognition between the self and the other. Secondly, it examines Hegel's use of Sophocles' Antigone to demonstrate the notion of the individual par excellence. I contend that Hegel's use of Antigone opens a new methodological framework through which to view his philosophy of intersubjectivity. It is Antigone that demonstrates the upheaval of an economy of exchange between the self and the other, whereby the alterity of the other transcends the self Ultimately, Hegel's philosophy of intersubjectivity must be reexamined, not only to dismiss Kojeve's problematic interpretation, but also to pose the possibility that Hegel's philosophy of intersubjectivity can viably account for a philosophy of the other that has a voice in contemporary philosophical debate.

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By using glucosamine resistant mutants of Saccharomyces ceriv~sa~ an attempt was made to discover the mechanisms which cause glucose repression and/or the Crabtree effect. The strains used are 4B2, GR6, lOP3r, GR8l and GRI08. 4B2 is a wild type yeast while the others are its mutants. To characterize the biochemical reactions which made these mutants resistant to glucosamine poisoning the following experiments were done~ 1. growth and respiration; 2. transport of sugars; 3. effect of inorganic phosphate (Pi): 4. Hexokinase; 5. In yivo phosphorylation. From the above experiments the following conclusions may be drawn: (i) GR6 and lOP3r have normal respiratory and fermentative pathways. These mutants are resistant to glucosamine poisoning due to a slow rate of sugar transport which is due to change in the cell membrane. (ii) GR8l has a normal respiratory pathway. The slow growth on fermentable carbon sourCEE indicates that in GR8l the lesion is in or associated with the glycolytic pathway. The lower rate of sugar transport may be due to a change in energy metabolism. The invivo phosphorylation rate indicates that in GR81 facilitated diffusion is the dominant transport mechanism. (iii) GR108 msa normal glycolytic pathway but the respiratory pathway is abnormal. The slow rate of sugar transport is due to a change in energy metabolism. The lower percentage of in vivo phosphorylation is probably due to a lowered availability of ATP because of the mitochondrial lesion. In all mutants resistance to glucosamine poisoning is due to a lower rate of utilization of ATP. which is caused by various mechanisms (see above), making less ADP available for phosphorylation via ATP synthase which utilizes inorganic phosphate. Because of the lower utilization of Pi, the concentration of intra-mitochondrial Pi does not go down thus protecting mutants from glucosamine poisoning.

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Silicon carbide, which has many polytypic modifications of a very simple and very symmetric structure, is an excellent model system for exploring, the relationship between chemical shift, long-range dipolar shielding, and crystal structure in network solids. A simple McConnell equation treatment of bond anisotropy effects in a poly type predicts chemical shifts for silicon and carbon sites which agree well with the experiment, provided that contributions from bonds up to 100 A are included in the calculation. The calculated chemical shifts depend on three factors: the layer stacking sequence, electrical centre of gravity, and the spacings between silicon and carbon layers. The assignment of peaks to lattice sites is proved possible for three polytypes (6H, 15R, and 3C). The fact that the calculated chemical shifts are very sensitive to layer spacings provides us a potential way to detennine and refine a crystal structure. In this work, the layer spacings of 6H SiC have been calculated and are within X-ray standard deviations. Under this premise, the layer spacings of 15R have been detennined. 29Si and 13C single crystal nmr studies of 6H SiC polytype indicate that all silicons and carbons are magnetically anisotropic. The relationship between a magnetic shielding tensor component and layer spacings has been derived. The comparisons between experimental and semi-empirical chemical shielding tensor components indicate that the paramagnetic shielding of silicon should be included in the single crystal chemical shift calculation.

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Tesis (Maestría en Enfermería con Especialidad en Salud Comunitaria) UANL

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Tesis (Maestría en Formación y Capacitación de Recursos Humanos) U.A.N.L.