Serum hematological and biochemical parameters of cattle naturally infected by Trypanosoma vivax

Trabalho de Conclusão de Curso (Especialização)O objetivo do trabalho foi avaliar os parâmetros bioquímicos séricos e hematológicos de bovinos naturalmente infectados por Trypanosoma vivax. Para isso, foram utilizadas amostras de sangue com anticoagulante EDTA K3 e sem anticoagulante de 58 bovinos com suspeita de tripanossomose. Foram realizados os hemogramas e as dosagens bioquímicas séricas de proteínas totais, albumina, globulinas, relação albumina:globulinas , creatinina, ureia, aspartato aminotransferase, fosfatase alcalina e gama glutamiltransferase. A pesquisa parasitológica foi realizada pela técnica do microhematócrito, além de extensões sanguíneas da papa de leucócitos coradas pelo May-Grünwald-Giemsa. Para a análise estatística foram utilizados o Teste de Tukey e Teste de Mann-Whitney. Das 58 amostras, 42 foram positivas e 16 foram negativas para formas tripomastigotas de Trypanosoma vivax. Uma anemia normocítica normocrômica foi observada nos animais positivos. A análise do leucograma revelou uma leucocitose por neutrofilia com desvio à esquerda e linfocitose nos animais negativos, com diferenças significativas (p<0,05) nas contagens de leucócitos totais, monócitos e eosinófilos. Alterações significativas (p<0,05) foram observadas nas concentrações de albumina, relação albumina:globulinas, aspartato aminotransferase e gama glutamiltransferase. As alterações no eritrograma e nas concentrações bioquímicas séricas são condizentes com uma infecção crônica por T. vivax. Anemia e alterações no proteinograma foram os achados mais significante

Rank-1 approximation to the van der Waals interaction

A new variational single-product approximation to the van der Waals dispersion interaction is presented and discussed. Test computations on atom-atom and diatom-diatom are also presente

A Davidson technique for the computation of dispersion constants: Full CI results for Be and Li

International audienc

A numerical method for computing dispersion constants

We reformulate and discuss a previously proposed variational numerical technique for the computation of dispersion coefficients. The method extends the Full CI idea to the perturbation equation for the intermolecular interaction, by expanding the perturbative solution in a small number of tensor products of suitably chosen Full CI vectors. Some new expansion vectors are proposed and their convergence properties are tested by performing computations on HF and H_2O. Last, a natural state analysis of the solution is performed via an orthogonal transformation of the original expansion vectors and it is found that a single couple of natural states strongly dominates the expansion

Theoretical study of Be linear chains: optimized geometries and harmonic frequencies

The electronic structure of linear Beryllium chains has been theoretically studied at an ab initio level. By using a CAS-SCF approach, geometries have been optimized and harmonic frequencies computed. The optimized geometries present almost equal bond lengths, while all the harmonic frequencies are real. This fact indicates the presence of a local minimum, at this level of theory, having a linear geometry. The energy splitting between the singlet ground state, 1Sigma_g , and the quasi-degenerated excited triplet, 3 Sigma_u, has been computed at CAS-SCF and MR-CI level. It is found that the splitting goes exponentially to zero as the number of atoms in the chain is increased

Kohn's localization in the insulating state: One-dimensional lattices, crystalline versus disordered

The qualitative difference between insulators and metals stems from the nature of the low-lying excitations, but also---according to Kohn's theory [Phys. Rev. vol. 133, A171 (1964)]---from a different organization of the electrons in their ground state: electrons are localized in insulators and delocalized in metals. We perform simulations over a one-dimensional binary alloy model, in a tight-binding scheme. In the ordered case the model is either a band insulator or a band metal, whereas in the disordered case it is an Anderson insulator. The results show indeed a localized/delocalized ground state in the insulating/metallic cases, as expected. More interestingly, we find a significant difference between the two insulating cases: band vs. Anderson. The insulating behavior is due to two very different scattering mechanisms. We show that even the organization of the electrons in the many body ground state is very different (for the same binary composition of the model system) in the two cases. We also analyze the relevant differences form the viewpoint of Boys' theory of localization

Full Configuration interaction study of the metal-insulator transition in model systems

The precursor of the Metal-Insulator transition is studied at ab-initio level in equally-spaced Lin and Ben linear chains. In particular, large-size Full Configuration-Interaction (FCI) calculations (up to one billion determinants for Li8 and half a billion for Be5) have been performed. At FCI level, it is possible to take into account the different nature of the electronic wavefunction at the different internuclear distances. Several indicators of the Metal-Insulator transition (minimum of the Koopmans energy gap, maximum of the localization and polarizability tensors) are considered and discussed. In is shown that the three considered properties indicate a Metal-Insulator transition at distances that are in remarkable agreement

CI calculations of long-range C6 dispersion coefficients for BH-BH

Large scale CI calculations of frequency-dependent dipole polarizabilities (FDPs) of ground state BH at the experimental distance of R = 2.329a0 have been performed using two sets of contracted GTO functions involving up to 316 7 106 symmetry-adapted Slater determinants, comparing recently developed interpolation and variational techniques. Final calculation of BH\u2013BH dispersion coefficients was done using the larger basis set of 268 AOs in the frozen-core FCI approximation and the lower bounds resulting from the variational approac

CI calculations of long-range C6 dispersion coefficients for BH-BH

Large scale Cl calculations of frequency-dependent dipole polarizabilities (FDPs) of ground state BH at the experimental distance of R = 2.329a(0) have been performed using two sets of contracted GTO functions involving up to 316 x 10(6) symmetry-adapted Slater determinants, comparing recently developed interpolation and variational techniques. Final calculation of BH-BH dispersion coefficients was done using the larger basis set of 268 AOs in the frozen-core FCI approximation and the lower bounds resulting from the variational approach. (c) 2007 Elsevier B.V. All rights reserved

On the calculation of High-Spin states in the Full Configuration Interaction formalism

A modified electronic Hamiltonian that allows the calculations of high-spin eigenfunctions in the S_z=0 manifold, is presented. In this formalism the low-spin states are shifted in energy while all the states having a multiplicity larger than a given value are kept untouched. This formalism has been applied to a test calculations of the lowest quintet state of the helium dimer and of the quintet state of the Tetrahedral Li_4 Cluster