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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 6 (1970), S. 220-226 
    ISSN: 1432-0827
    Keywords: Hypercalcemia ; Hypocalcemia ; Adrenal Cortex ; Hormones ; Secretion ; Calcium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Les augmentations en teneur du calcium plasmatique, provoquées par le gluconate de calcium, donnent des taux de sécrétions plus élevées du cortex surrénalien chez les chiens anesthésiés. L'hypocalcémie consécutive à l'action du EDTA n'a pas d'action sur ces sécrétions et l'hypophysectomie supprime l'augmentation des taux de sécrétion, observés chez l'animal entier hypercalcémique. Les mécanismes par lesquels le calcium peut affecter les sécrétions cortico-surrénaliennes sont envisagés en fonction des effects au niveau des différentes phases du système hypothalamo-hypophyso-cortico-surrénalien.
    Abstract: Zusammenfassung Durch Infusion von Calciumgluconat verursachte Erhöhungen des Plasmacalciumspiegels ergaben beim anaesthesierten Hund eine gesteigerte adrenocorticale Sekretion. Die Hypocalcämie, die auf Grund von EDTA-Infusion entstand, hatte keine sichtbare Wirkung auf das Ausmaß der adrenocorticalen Sekretion. Durch Hypophysektomie wurde die gesteigerte Sekretion, wie man sie beim hypercalcaemischen Tier findet, aufgehoben. Die Mechanismen, durch welche Calcium die adrenocorticale Sekretion beeinflussen kann, werden im Hinblick auf seine Wirkung an verschiedenen Stellen im hypothalamo-hypophysär-adrenocorticalen System besprochen.
    Notes: Abstract Increases in plasma calcium levels caused by the infusion of calcium gluconate resulted in enhanced adrenocortical secretory rates in anesthetized dogs. Hypocalcemia resulting from the infusion of EDTA had no discernible effect on adrenocortical secretory rates, and hypophysectomy abolished the rise in secretory rates noted in the hypercalcemic intact animals. The mechanisms by which calcium may effect adrenocortical secretion are discussed with respect to its effect at various sites in the hypothalamo-hypophyseal-adrenocortical system.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-07-13
    Description: High temperature heat engines designed to make maximum use of the thermodynamic potential of concentrated solar radiation are described. Plasmas between 2000 K and 4000 K can be achieved by volumetric absorption of radiation in alkali metal vapors, leading to thermal efficiencies up to 75% for terrestrial solar power plants and up to 50% for space power plants. Two machines capable of expanding hot plasmas using practical technology are discussed. A binary Rankine cycle uses fluid mechanical energy transfer in a device known as the 'Comprex' or 'energy exchanger.' The second machine utilizes magnetohydrodynamics in a Brayton cycle for space applications. Absorption of solar energy and plasma radiation losses are investigated for a solar superheater using potassium vapor.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 78-1177 , Fluid and Plasma Dynamics Conference; Jul 10, 1978 - Jul 12, 1978; Seattle, WA
    Format: text
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  • 3
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    Unknown
    In:  Other Sources
    Publication Date: 2019-07-13
    Description: Low temperature plasmas wherein an alkali metal vapor is a component are uniquely suited to simultaneously absorb solar radiation by coupling to the resonance lines and produce electrical power by the MHD interaction. This work is an examination of the possibility of developing space power systems which take advantage of concentrated solar power to produce electricity. It is shown that efficient cycles in which expansion work takes place at nearly constant top cycle temperature can be devised. The power density of the solar MHD generator is lower than that of conventional MHD generators because of the relatively high seed concentration required for radiation absorption and the lower flow velocity permitted to avoid total pressure losses due to heating.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Radiation energy conversion in space; Conference; Jan 26, 1978 - Jan 28, 1978; Moffett Field, CA
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