Exogenous And Endogenous Development
Mostrando 25-36 de 142 artigos, teses e dissertações.
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25. Alterations in Water Status, Endogenous Abscisic Acid Content, and Expression of rab18 Gene during the Development of Freezing Tolerance in Arabidopsis thaliana.
Treatments as diverse as exposure to low temperature (LT), exogenous abscisic acid (ABA), or drought resulted in a 4 to 5[deg]C increase in freezing tolerance of the annual herbaceous plant Arabidopsis thaliana. To correlate the increase in freezing tolerance with the physiological changes that occur in response to these treatments, we studied the alteration
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26. Elongation of exogenous fatty acids by the bioluminescent bacterium Vibrio harveyi.
Bioluminescent bacteria require myristic acid (C14:0) to produce the myristaldehyde substrate of the light-emitting luciferase reaction. Since both endogenous and exogenous C14:0 can be used for this purpose, the metabolism of exogenous fatty acids by luminescent bacteria has been investigated. Both Vibrio harveyi and Vibrio fischeri incorporated label from
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27. Androgen regulation of epidermal growth factor receptor binding activity during fetal rabbit lung development.
Fetal lung development progresses in a sex-specific manner with male fetuses exhibiting delayed maturation. Androgens, both exogenous and endogenous, inhibit while epidermal growth factor (EGF) enhances fetal lung development. We hypothesized that one mechanism responsible for the delay in male fetal lung development is an androgen-induced delay in EGF recep
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28. Oxidation of Imported or Endogenous Carbohydrates by Isolated Chloroplasts from Green Pepper Fruits.
Recently, we demonstrated that intact chloroplasts isolated from green pepper (Capsicum annum L.) fruits use exogenous glucose-6-phosphate (Glc-6-P) as the most efficient precursor for starch biosynthesis (O. Batz, R. Scheibe, H.E. Neuhaus [1995] Planta 196: 50-57). Here we demonstrate that these chloroplasts transport this hexose phosphate in counter-exchan
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29. Gibberellins and Seed Development in Maize. II. Gibberellin Synthesis Inhibition Enhances Abscisic Acid Signaling in Cultured Embryos1
Abscisic acid (ABA) is required for seed maturation in maize (Zea mays L.) and other plants. Gibberellins (GAs) are also present in developing maize embryos, and mutual antagonism of GAs and ABA appears to govern the choice between precocious germination or quiescence and maturation. Exogenous ABA can also induce quiescence and maturation in immature maize e
American Society of Plant Physiologists.
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30. Monoclonal antibodies to nerve growth factor affect the postnatal development of the visual system.
Exogenous supply of nerve growth factor (NGF) prevents the effects of monocular deprivation. This suggests that visual afferents may be competing for an endogenous neurotrophic factor, related to NGF, whose production by postsynaptic cells depends on the activity of afferent fibers. To test the hypothesis that endogenous NGF may play a role in the functional
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31. A Mutation Altering Auxin Homeostasis and Plant Morphology in Arabidopsis.
Many aspects of plant development are associated with changing concentrations of the phytohormone auxin. Several stages of root formation exhibit extreme sensitivities to exogenous auxin and are correlated with shifts in endogenous auxin concentration. In an effort to elucidate mechanisms regulating development of adventitious roots, an ethyl methanesulfonat
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32. Neurotrophins are key mediators of the myelination program in the peripheral nervous system
Although knowledge of the functions of neurotrophins has advanced rapidly in recent years, studies concerning the involvement of neurotrophins in glial–neuronal interactions rarely extend further than their roles in supporting the survival and differentiation of neuronal cells. In this study endogenous brain-derived neurotrophic factor (BDNF) and neur
The National Academy of Sciences.
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33. In Vitro Sugar Transport in Zea mays L. Kernels 1: II. Characteristics of Sugar Absorption and Metabolism by Isolated Developing Embryos
In vitro sugar transport into developing isolated maize embryos was studied. Embryo fresh and dry weight increased concomitantly with endogenous sucrose concentration and glucose uptake throughout development. However, endogenous glucose and fructose concentration and sucrose uptake remained constant. The uptake kinetics of radiolabeled sucrose, glucose, and
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34. Mechanisms of Glucose Signaling during Germination of Arabidopsis1
Glucose (Glc) signaling, along with abscisic acid (ABA) signaling, has been implicated in regulating early plant development in Arabidopsis. It is generally believed that high levels of exogenous Glc cause ABA accumulation, which results in a delay of germination and an inhibition of seedling development—a typical stress response. To test this hypothes
The American Society for Plant Biologists.
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35. The Repair of Complex Neuronal Circuitry by Transplanted and Endogenous Precursors
Summary: During the past three decades, research exploring potential neuronal replacement therapies has focused on replacing lost neurons by transplanting cells or grafting tissue into diseased regions of the brain. However, in the last decade, the development of novel approaches has resulted in an explosion of new research showing that neurogenesis, the bir
The American Society for Experimental NeuroTherapeutics.
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36. Na+ channel mis-expression accelerates K+ channel development in embryonic Xenopus laevis skeletal muscle.
1. The normal developmental pattern of voltage-gated ion channel expression in embryonic skeletal muscle cells of the frog Xenopus laevis was disrupted by introduction of cloned rat brain Na+ channels. 2. Following injection of channel mRNA into fertilized eggs, large Na+ currents were observed in muscle cells at the earliest developmental stage at which the