Identificação de polimorfismos no gene da leptina bovina.

O objetivo desse trabalho foi identificar a existência de polimorfismos de conformação de cadeia simples (SSCP) e de tamanho de fragmentos de restrição (RFLP) em regiões do gene da leptina amplificadas por reação em cadeia da polimerase (PCR) de bovinos de corte pertencentes a três grupos genéticos terminados em confinamento.bitstream/CPAF-RO-2010/13292/1/cot336-leptina-bovina.pd

Correlation of Atrial Fibrillation with Left Atrial Volume in Patients with Mitral Stenosis. a Single Centre Study From Pakistan

Background: Rheumatic heart disease has a strong association with mitral valve stenosis. Atrial fibrillation is one of the most common complications of this condition and is a poor prognostic factor. Early detection and prompt management of atrial fibrillation can help to improve the quality of life and increase the life expectancy of the patients. We carried out this study to investigate the significance of left atrial volumetric changes in mitral stenosis and its correlation with atrial fibrillation. Methodology: We audited the data of 60 patients of rheumatic heart disease who had mitral valve stenosis. The patients were randomized into atrial fibrillation (Group A) and normal sinus rhythm (Group B). We conducted this cross-sectional analytical study at Cardiology Department, Mayo Hospital, Lahore, from 1st February 2017 to 31st January 2018. We only included those patients who consented to be a part of this study and fulfilled our predefined inclusion criteria. Left atrial volume was measured by prolate ellipse method and biplane methods on echocardiography. The Data was analyzed on SPSS v20. Results: Sixty patients were included in the study. Among the subjects, thirty-six (60%) were males, and twenty-four (40%) were females. Atrial fibrillation was noted in 43.33% of the patients of mitral valve stenosis. There was a marked difference in the mean volume of the left atrium among the two groups. We observed that the mean area of the mitral valve for Group A patients was larger than that of patients in Group B. Our study showed an inverse correlation between left atrial volume and mitral valve area among Group A patients. Conclusion: Patients of mitral stenosis are at an increased risk of developing atrial fibrillation if the left atrial volume is increasing. All patients with mitral stenosis should have routine echocardiography & measurement of left atrial volumes, so that proper treatment can be started if the left atrial volume is increasing, to prevent atrial fibrillation

NMR and μ+\mu^{+}SR detection of unconventional spin dynamics in Er(trensal) and Dy(trensal) molecular magnets

Measurements of proton Nuclear Magnetic Resonance (1H NMR) spectra and relaxation and of Muon Spin Relaxation ($\mu^{+}$SR) have been performed as a function of temperature and external magnetic field on two isostructural lanthanide complexes, Er(trensal) and Dy(trensal) featuring crystallographically imposed trigonal symmetry. Both the nuclear 1/T1 and muon $\lambda$ longitudinal relaxation rates, LRR, exhibit a peak for temperatures T lower than 30K, associated to the slowing down of the spin dynamics, and the width of the NMR absorption spectra starts to increase significantly at T ca. 50K, a temperature sizably higher than the one of the LRR peaks. The LRR peaks have a field and temperature dependence different from those previously reported for all Molecular Nanomagnets. They do not follow the Bloembergen-Purcell-Pound scaling of the amplitude and position in temperature and field and thus cannot be explained in terms of a single dominating correlation time $\tau$c determined by the spin slowing down at low temperature. Further, for T lower than 50K the spectral width does not follow the temperature behavior of the magnetic susceptibility chi. We suggest, using simple qualitative considerations, that the observed behavior is due to a combination of two different relaxation processes characterized by the correlation times $\tau$LT and $\tau$HT, dominating for T lower than 30K and T higher than 50K, respectively. Finally, the observed flattening of LRR for T lower than 5K is suggested to have a quantum origin

Estimativa do custo de produção de leite em Machadinho d?Oeste, RO, outubro de 2006.

Este estudo objetiva avaliar a renda proporcionada pela atividade leiteira para uma propriedade rural típica, representativa do sistema de produção mais evidente em Machadinho d?Oeste, Estado de Rondônia.bitstream/item/24721/1/cot320-leite-machadinhodoeste.pd

Marcadores moleculares na bovinocultura de corte.

A pecuária de corte no Brasil ainda está em busca de melhores índices em termos de produtividade e precocidade do rebanho. A grande esperança para o melhoramento genético mais eficaz e mais rápido das raças zebuínas, em especial a Nelore, está aliada aos resultados obtidos com a genética molecular, a qual vem se estabelecendo cada vez mais nos centros de pesquisas. O desenvolvimento de técnicas moleculares surge Marcadores moleculares na bovinocultura de corte como uma ferramenta a mais a ser utilizada na análise genética visando o aprimoramento de características de interesse econômico. Apesar da grande notoriedade, os conceitos sobre marcadores moleculares ainda são pouco conhecidos pela grande maioria dos atores envolvidos com a pecuária de corte nacional. Esta é uma revisão organizada em forma de perguntas e respostas, as quais visam definir marcadores moleculares, esclarecer como os mesmos são detectados em laboratório e explicar como os resultados de pesquisa podem ser aplicados para aprimorar o desempenho de bovinos, com ênfase naqueles destinados à produção de carne

The Inflationary Perturbation Spectrum

Motivated by the prospect of testing inflation from precision cosmic microwave background observations, we present analytic results for scalar and tensor perturbations in single-field inflation models based on the application of uniform approximations. This technique is systematically improvable, possesses controlled error bounds, and does not rely on assuming the slow-roll parameters to be constant. We provide closed-form expressions for the power spectra and the corresponding scalar and tensor spectral indices.Comment: 4 pages, 1 figur

Nanoscale layering of antiferromagnetic and superconducting phases in Rb2Fe4Se5

We studied phase separation in a single-crystalline antiferromagnetic superconductor Rb2Fe4Se5 (RFS) using a combination of scattering-type scanning near-field optical microscopy (s-SNOM) and low-energy muon spin rotation (LE-\mu SR). We demonstrate that the antiferromagnetic and superconducting phases segregate into nanometer-thick layers perpendicular to the iron-selenide planes, while the characteristic in-plane size of the metallic domains reaches 10 \mu m. By means of LE-\mu SR we further show that in a 40-nm thick surface layer the ordered antiferromagnetic moment is drastically reduced, while the volume fraction of the paramagnetic phase is significantly enhanced over its bulk value. Self-organization into a quasiregular heterostructure indicates an intimate connection between the modulated superconducting and antiferromagnetic phases.Comment: 5 pages, 2 figures. Updated version published in Phys. Rev. Lett. on 5 July 201