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Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Teores de nutrientes de dois cultivares de oliveira durante o crescimento vegetativo e o florescimento
Para o planejamento de adubações, visando a manter os níveis de nutrientes adequados para as plantas, é importante monitorar seu estado nutricional durante as diferentes fases de desenvolvimento, sendo a análise foliar o melhor método para avaliar os níveis de nutrientes na planta. Esta pesquisa foi realizada com o objetivo de avaliar os teores de nut
Rev. Ceres. Publicado em: 2013-08
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2. Seasonal recruitment of hippocampal neurons in adult free-ranging black-capped chickadees.
Neurogenesis and neuronal replacement in a population of wild free-ranging animals are described. Our subjects were adult black-capped chickadees (Parus atricapillus). Neuronal birth dates were determined by a single systemic injection of [3H]thymidine, followed by release of the bird and its recapture 6 or more weeks later. Newly formed neurons appeared in
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3. A ligand-specific action of chelated copper on hypothalamic neurons: stimulation of the release of luteinizing hormone-releasing hormone from median eminence explants.
We have previously shown that chelated copper stimulates the release of luteinizing hormone-releasing hormone (LHRH) from isolated hypothalamic granules. In this study, we wished to ascertain if chelated copper acts on hypothalamic neurons to stimulate LHRH release and, if so, what is the ligand specificity of this interaction. An in vitro system of explants
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4. Recruitment and replacement of hippocampal neurons in young and adult chickadees: an addition to the theory of hippocampal learning.
We used [3H]thymidine to document the birth of neurons and their recruitment into the hippocampal complex (HC) of juvenile (4.5 months old) and adult blackcapped chickadees (Parus atricapillus) living in their natural surroundings. Birds received a single dose of [3H]thymidine in August and were recaptured and killed 6 weeks later, in early October. All brai
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5. Differential sub-cellular compartmentalization of thyrotropin releasing hormone (TRH) and gonadotropin releasing hormone (LRH) in hypothalamic tissue.
Homogenates of male rat hypothalami were fractionated by differential centrifugation. Of the total quantity of TRH and LRH in the homogenate, about 50% was in particles sedimenting at 11,500 X g. and 15-20% was in particles sedimenting between 20,000 and 105,000 X g. No LRH or TRH was recovered in the 105,000 X g supernatant fluid. When the 900 X g supernata
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6. Identification of a carbonic anhydrase-like domain in the extracellular region of RPTP gamma defines a new subfamily of receptor tyrosine phosphatases.
The tyrosine phosphatase RPTP gamma is a candidate tumor suppressor gene since it is located on human chromosome 3p14.2-p21 in a region frequently deleted in certain types of renal and lung carcinomas. In order to evaluate its oncogenic potential and to explore its normal in vivo functions, we have isolated cDNAs and deduced the complete sequences of both hu
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7. Copper amplification of prostaglandin E2 stimulation of the release of luteinizing hormone-releasing hormone is a postreceptor event.
We have shown that copper amplifies prostaglandin E2 (PGE2) stimulation of luteinizing hormone-releasing hormone (LH-RH) from explants of the median eminence area (MEA) and that this process is calcium-dependent. Since a Ca-cAMP pathway has been implicated in PGE2 action on the LH-RH neuron, in this study we wished to ascertain if copper exerts its effect on