Growth Periodicity
Mostrando 13-24 de 49 artigos, teses e dissertações.
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13. Daily birth numbers in Passo Fundo, South Brazil, 1997-1999: trends and periodicities
Between October 6, 1997 and April 30, 1999, 5011 births (mean: 8.76 per day) were registered in the city of Passo Fundo, South Brazil. The sequence of 572 daily birth numbers was not random (iteration test). Neyman distribution (m = ¥) showed the best fit. Clusters of days with higher birth numbers alternated with days with low numbers of births. Periodogra
Braz J Med Biol Res. Publicado em: 2002-08
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14. Magnetic walls in nematic liquid crystals
In recent published papers it has been shown that the theory about the formation of magnetic walls in the neighborhoods of the Fréedericksz threshold is in profound disagreement with experiments. This finding leads to the development of a new theory for the onset of these structures in this region of magnetic fields. In this paper we present a review of the
Brazilian Journal of Physics. Publicado em: 2002-06
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15. Growth periodicity and formation of wood of some tree species of semideciduous seasonal forest in the southeast region of the state of São Paulo. / Periodicidade do crescimento e formação da madeira de algumas espécies arbóreas de florestas estacionais semidecíduas da região sudeste do estado de São Paulo.
The dendrocronology and dendroclimatology studies are now being used in the tropical and subtropical Brazilian forest. These studies are important to correlate the growth rate of forest species with climatic conditions and phenological behaviour to determine the age of the trees. This way, this investigation had as main objectives: (i) study the cambial peri
Publicado em: 2002
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16. Study on the periodicity of growth, phenology and the relation with the changing activity of tropical arboreal species in semidecidual stately forests. / Estudo da periodicidade do crescimento, fenologia e relação com a atividade cambial de espécies arbóreas tropicais de florestas estacionais semideciduais.
O presente trabalho foi desenvolvido em áreas florestais naturais e implantadas de Florestas Estacionais Semideciduais remanescentes do planalto paulista com o objetivo de estudar a periodic idade de crescimento, fenologia e atividade cambial. A pesquisa visa determinar a idade e o crescimento de 23 espécies arbóreas tropicais e subtropicais, contribuindo
Publicado em: 2002
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17. Modelling lucerne (Medicago sativa L.) crop response to light regimes in an agroforestry system
The general goal of this research was to understand the agronomic and physiological changes of a lucerne crop in distinct physical radiation environments and to verify the potential of lucerne to grow under shaded conditions. To achieve this, the research was conducted in four main steps: (i) firstly, experimental data collection in the field using two artif
Publicado em: 2002
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18. Diurnal Variations in Photosynthetic Products and Nitrogen Metabolism in Expanding Leaves
Expanding leaves of Capsicum frutescens L. cv. California Wonder, Cucumis melo L. cv. Hales Best, and Citrus sinensis L. Osbeck cv. Washington Navel showed a marked diurnal periodicity in the incorporation of 14C from photosynthetically fixed 14CO2 into amino acids. Incorporation was virtually nil at the beginning of the photoperiod, reached a maximum in the
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19. Megadontia, striae periodicity and patterns of enamel secretion in Plio-Pleistocene fossil hominins
Early hominins formed large and thick-enamelled cheek-teeth within relatively short growth periods as compared with modern humans. To understand better the developmental basis of this process, we measured daily enamel increments, or cross striations, in 17 molars of Plio-Pleistocene hominins representing seven different species, including specimens attribute
Blackwell Science Inc.
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20. The effect of administration of human growth hormone on the plasma growth hormone, cortisol, glucose, and free fatty acid response to insulin: evidence for growth hormone autoregulation in man
The effect of administration of human growth hormone (HGH) (3 mg every 6 hr for 6 days) on the endogenous GH response to insulin-induced hypoglycemia at 8, 12, 24, and 48 hr posttreatment was studied in 11 healthy male adults. Free fatty acid, cortisol, and glucose responses pre- and posttreatment with HGH were evaluated concurrently. Control subjects receiv
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21. Periodic synthesis of phospholipids during the Caulobacter crescentus cell cycle.
Net phospholipid synthesis is discontinuous during the Caulobacter crescentus cell cycle with synthesis restricted to two discrete periods. The first period of net phospholipid synthesis begins in the swarmer cell shortly after cell division and ends at about the time when DNA replication initiates. The second period of phospholipid synthesis begins at a tim
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22. Relationship between the three-hour-period sleep-wakefulness cycle and growth hormone secretion in the immature rat.
The temporal pattern of growth hormone (GH) secretion throughout a day and its correlation with the sleep-wakefulness cycle in the 29-31-day-old female rat were studied by serial blood sampling through an intracardiac cannula at 10-min intervals. Electroencephalograms (e.e.g.s) recorded continuously during blood sampling periods were scored into wakefulness
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23. Growth Ring Formation in the Starch Granules of Potato Tubers1
Starch granules from higher plants contain alternating zones of semicrystalline and amorphous material known as growth rings. The regulation of growth ring formation is not understood. We provide several independent lines of evidence that growth ring formation in the starch granules of potato (Solanum tuberosum) tubers is not under diurnal control. Ring form
American Society of Plant Biologists.
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24. Starch Synthesis in Arabidopsis. Granule Synthesis, Composition, and Structure1
The aim of this work was to characterize starch synthesis, composition, and granule structure in Arabidopsis leaves. First, the potential role of starch-degrading enzymes during starch accumulation was investigated. To discover whether simultaneous synthesis and degradation of starch occurred during net accumulation, starch was labeled by supplying 14CO2 to
American Society of Plant Physiologists.