9,832 research outputs found
Produtividade e precocidade de genótipos da coleção nuclear de feijão (Phaseolus vulgaris L.) da Embrapa em condições de deficiência hÃdrica moderada.
O trabalho teve como objetivo conduzir uma avaliação preliminar de genótipos de feijão, para subsidiar o programa de melhoramento da Embrapa Arroz e Feijão direcionado para regiões com probabilidade de ocorrência de deficiência hÃdrica durante a época normal do desenvolvimento da cultura.CONAF
Avaliação de famÃlias F5:8 de uma população de mapeamento, do cruzamento BAT 477 x BRS Pérola, sob condições de deficiência hÃdrica.
Este trabalho objetivou avaliar famÃlias F5:8 de uma população de mapeamento, do cruzamento BAT 477 x BRS Pérola, em condições de deficiência hÃdrica na Estação Experimental da Emater, em Porangatu, GO.CONAF
Fetal growth and glycemic control in type 1 diabetes pregnancy
INTRODUCTION: Conflicting results have been reported with respect to the relationship between direct or indirect measures of glycemic control in mothers with type 1 diabetes and macrosomia. OBJECTIVE: To evaluate the frequency of LGA babies in type 1 diabetic pregnancies and analyse the influence of some maternal characteristics and glucose control in oversized babies. MATERIAL AND METHODS: A retrospective study of 18 pregnant women with type 1 diabetes mellitus was performed. It was divided in two groups: group 1 (G1- n=9)--pregnant women with LGA babies and group 2 (G2- n=9)--pregnant women with AGA (Appropriate weight for gestational age) babies. We evaluate the follow parameters: HbA1c in the third trimester of pregnancy, fasting and 1 h postprandial capillary glucose levels, pregestational BMI, maternal age, duration of Diabetes mellitus, weight gain during pregnancy, microvascular diabetes complications (retinopathy and nefropathy), and type of delivery. We defined LGA birth weight over the 90 centile. RESULTS: LGA babies occurred in 50% of gestations. We did not find any statistical differences in maternal age, diabetes mellitus duration, pregestational BMI, weight gain during pregnancy, microvascular diabetes complications, HbA1c levels (medium value in the two groups 6,5%). The glucose fasting values were higher in G1: 95,7 +/- 31.7 mg/ dl, vs G2: 83.3 +/- 17.1 mg/dl without, however, reaching statistically significant differences. There was statically differences in postprandial glucose values G1: 160.3 +/- 60.2 mg/dl vs G2: 111.9 +/- 27.1 mg/dl -- p= 0.043. CONCLUSIONS: The frequency of LGA babies was elevated 50% in type 1 diabetic pregnancies, although normal HbA1c values. Thus we conclude that the 1 h postprandial glucose levels should be considered a strong predictor of fetal growth
Biomass burning and urban air pollution over the Central Mexican Plateau
Observations during the 2006 dry season of highly elevated concentrations of cyanides in the atmosphere above Mexico City (MC) and the surrounding plains demonstrate that biomass burning (BB) significantly impacted air quality in the region. We find that during the period of our measurements, fires contribute more than half of the organic aerosol mass and submicron aerosol scattering, and one third of the enhancement in benzene, reactive nitrogen, and carbon monoxide in the outflow from the plateau. The combination of biomass burning and anthropogenic emissions will affect ozone chemistry in the MC outflow
PRIVATE SAVINGS IN TRANSITION ECONOMIES: ARE THERE TERMS OF TRADE SHOCKS?
The paper examines the impact of terms of trade shocks on private savings in the transition economies after accounting for the effect of other determinants. Economic agents in the transition economies are subject to tight credit constraints which are more pronounced during bad state of nature. Thus, adverse shocks to commodity prices in the world market can force them to reduce savings by a larger amount than they would otherwise have. Empirical analysis using a dynamic panel model and data from twenty one transition economies confirm that most of the determinants of savings identified in the literature also apply to the transition economies. Favorable movements in both the permanent and transitory components of the terms of trade have a significant positive impact on private savings with transitory movements having a larger impact than the permanent component. This reflects the lack of access to foreign borrowing that many of the transition economies have faced during the last decade. Although the impact of terms of trade shocks are found to be asymmetric, the magnitude of the impact appears to be small. The results are robust for alternative estimators, determinants, and country groupings.http://deepblue.lib.umich.edu/bitstream/2027.42/39958/3/wp572.pd
A comparative analysis of the observed white dwarf cooling sequence from globular clusters
We report our study of features at the observed red end of the white dwarf
cooling sequences for three Galactic globular clusters: NGC\,6397, 47\,Tucanae
and M\,4. We use deep colour-magnitude diagrams constructed from archival
Hubble Space Telescope (ACS) to systematically investigate the blue turn at
faint magnitudes and the age determinations for each cluster. We find that the
age difference between NGC\,6397 and 47\,Tuc is 1.98\,Gyr,
consistent with the picture that metal-rich halo clusters were formed later
than metal-poor halo clusters. We self-consistently include the effect of
metallicity on the progenitor age and the initial-to-final mass relation. In
contrast with previous investigations that invoked a single white dwarf mass
for each cluster, the data shows a spread of white dwarf masses that better
reproduce the shape and location of the blue turn. This effect alone, however,
does not completely reproduce the observational data - the blue turn retains
some mystery. In this context, we discuss several other potential problems in
the models. These include possible partial mixing of H and He in the atmosphere
of white dwarf stars, the lack of a good physical description of the
collision-induced absorption process and uncertainties in the opacities at low
temperatures. The latter are already known to be significant in the description
of the cool main sequence. Additionally, we find that the present day local
mass function of NGC\,6397 is consistent with a top-heavy type, while 47\,Tuc
presents a bottom-heavy profile.Comment: Accepted for publication in MNRAS (16 pages, 19 figures
Performance of the \u3ci\u3eLeucaena leucocephala\u3c/i\u3e–\u3ci\u3eMegathyrsus maximus\u3c/i\u3e cv Mombasa System and Local Range Grazed by Pelibuey Ewe-Lambs
Mombasa grass and leucaena have shown an excellent agronomic performance grown in tropical semi-arid ranges, the objective of this study was to compare the agronomic performance of Leucaena-Mombasa grown as a silvopastoral system at two leucaena plant densities (10000 and 15000 plants ha-1) and of Pelibuey ewe-lambs grazing it against native unimproved tropical semi-arid range of the state of Morelos, México. Experimental design was a completely random with two replications. Unimproved native range was mainly deciduous shrubs and mixed herbaceous plants (Poaceae and Asteraceae). Stocking rate was the same across treatments and grazing lasted all rainy season. Of the agronomic variables determined, both Leucaena-Mombasa systems showed the same (p\u3e 0.05) forage on-offer total and expressed as herbage-allowance but 29 and 15% higher (p≤ 0.05) respectively than the unimproved native range. Leucaena-Mombasa at the highest leucaena density showed the highest harvest rate, 22 and 50% higher (p≤ 0.05) than the registered at the lower density and unimproved native range, respectively. Unimproved native range herbaceous layer showed 40% higher (p≤ 0.05) crude protein content than the layer at both Leucaena-Mombasa systems; tree fodder was only different (p\u3c 0.05) in in vitro dry matter digestibility, tree fodder from both Leucaena-Mombasa systems was 32% higher (p≤ 0.05) than that of unimproved native range. Ewe-lambs grazing any of the Leucaena-Mombasa systems showed a daily weight gain 1.5 times higher (p\u3c 0.05) than those grazing the unimproved native range. It was concluded that Leucaena-Mombasa system is an option to improve agronomic and animal performances compare to unimproved tropical native range
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