Eficiência a campo do sêmen suíno congelado.

bitstream/item/59160/1/CUsersPiazzonDocuments46.pd

Is the positive relationship of infant weight gain with adolescent adiposity attenuated by moderate-to-vigorous physical activity in childhood? Evidence from the Millennium Cohort Study

OBJECTIVE: Rapid infant weight gain is a key risk factor for paediatric obesity, yet there is very little evidence on how healthy behaviours in childhood might modify this association. We aimed to examine how the association of infant weight gain with adolescent adiposity might be attenuated by moderate-to-vigorous physical activity (MVPA) in childhood. METHODS: The sample comprised 4666 children in the UK Millennium Cohort Study. The two outcomes were BMI Z-score and % fat at 14 years. Sex-stratified regression models were developed testing for interactions between infant weight Z-score gain between 0 and 3 years (continuous or categorical) and MVPA at 7 years (continuous or binary). Models were sequentially adjusted for basic covariates, socioeconomic variables, and parental BMI levels. RESULTS: Effect modification was observed in boys but not girls and, among boys, was stronger for % fat than BMI. In a fully adjusted model for boys, the association between infant weight Z-score gain and adolescent % fat was 1.883 (1.444, 2.322) if MVPA < 60 min/day and 1.305 (0.920, 1.689) if MVPA ≥ 60 min/day; the difference between these two estimates being −0.578 (−1.070, −0.087). Similarly, % fat was 2.981 (1.596, 4.367) units higher among boys who demonstrated rapid infant weight gain (+0.67 to +1.34 Z-score) compared to normal weight gain (−0.67 to +0.67 Z-scores), but having MVPA ≥ 60 min/day reduced this effect size by −2.259 (−3.989, −0.535) units. CONCLUSIONS: In boys, ~75% of the excess % fat at 14 years associated with rapid infant weight gain was attenuated by meeting the MVPA guideline. In boys known to have demonstrated rapid infant weight gain, increasing childhood MVPA levels, with the target of ≥60 min/day, might therefore go a long way to towards offsetting their increased risk for adolescent obesity. The lack of effect modification in girls is likely due to lower MVPA levels

Caracterização química do fruto em diferentes genótipos de camucamuzeiro.

Na Amazônia existem frutas nativas com grande potencial para fins agroindustriais que tem despertado o interesse comercial de indústrias nacionais e estrangeiras visando explorar potenciais aplicações farmacológicas, cosméticas e conservantes dessas espécies. Considerando a importância do camu-camu como alimento funcional realizou-se o presente trabalho para avaliar o potencial agroindustrial de frutos em oito genótipos de camucamuzeiro colhidos de plantas matrizes do Banco Ativo de Germosplasma da Embrapa Amazonia Oriental, visando eleger dentre eles, o mais qualificado para utilização industrial, considerando suas características químicas. Os frutos foram caracterizados avaliando suas partes tissulares e quimicamente quanto ao teor de umidade, cinzas, sólidos solúveis totais (SST) em °Brix, pH e acidez total titulável (ATT), de acordo com as normas analíticas do Instituto Adolfo Lutz e do Ministério da Agricultura e do abastecimento. Os resultados permitem afirmar que todos os genótipos estudados apresentaram elevada variabilidade, dentre as melhores características químicas. Entretanto, a matriz M25 foi a que apresentou as melhores características com baixos teores de sólidos solúveis (7,58), cinzas (0,29%), pH (2,00) e alta umidade (92,75%) e acidez (5,35%), indicando que a caracterização dos frutos de camu-camu pode contribuir significativamente com programa de melhoramento genético

Colheita e armazenamento de sementes de coentro.

Made available in DSpace on 2011-04-09T16:13:50Z (GMT). No. of bitstreams: 1 nascimentocolheita.pdf: 1775148 bytes, checksum: 55e9ecfa2f8f7b5b443ff8e6687a2648 (MD5) Previous issue date: 2007-03-2

Realization of Rectangular Artificial Spin Ice and Direct Observation of High Energy Topology

In this letter, we have constructed and experimentally investigated frustrated arrays of dipoles forming two-dimensional artificial spin ices with different lattice parameters (rectangular arrays with horizontal and vertical lattice spacings denoted by $a$ and $b$ respectively). Arrays with three different ratios $\gamma =a/b = \sqrt{2}$, $\sqrt{3}$ and $\sqrt{4}$ are studied. Theoretical calculations of low-energy demagnetized configurations for these same parameters are also presented. Experimental data for demagnetized samples confirm most of the theoretical results. However, the highest energy topology (doubly-charged monopoles) does not emerge in our theoretical model, while they are seen in experiments for large enough $\gamma$. Our results also insinuate that magnetic monopoles may be almost free in rectangular lattices with a critical ratio $\gamma = \gamma_{c} = \sqrt{3}$, supporting previous theoretical predictions

Chiral fermions and torsion in the early Universe

Torsion arising from fermionic matter in the Einstein-Cartan formulation of general relativity is considered in the context of Robertson-Walker geometries and the early Universe. An ambiguity in the way torsion arising from hot fermionic matter in chiral models should be implemented is highlighted and discussed. In one interpretation, chemical potentials in chiral models can contribute to the Friedmann equation and give a negative contribution to the energy density.Comment: 5 pages revtex4; error in v1 corrected

Consolidação das pesquisas em integração lavoura-pecuária-floresta no Brasil.

O número de pesquisas com sistemas de integração Lavoura-Pecuária-Floresta é crescente no Brasil. Existem variações do sistema de acordo com a região e finalidade do experimento. Esta pesquisa objetivou sistematizar as principais características dos sistemas de integração implantados no Brasil. foram coletados trabalhos científicos com abordagem no tema pela internet. Uma base de dados foi montada e analisada classificando a região com base na produção científica e no foco da pesquisa