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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 7 (1971), S. 257-258 
    ISSN: 1432-0827
    Keywords: Dentinogenesis ; Amelogenesis ; Teeth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2013
    Keywords: Spinal Transection ; Temperature Regulation ; Regional Sympathetic Activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Thermally induced adjustments of skin blood flow in chronically spinalized dogs may occur without alterations of arterial pressure and heart rate. In lightly anesthetized rabbits with chronic spinal transection at the level of C6/C7, the question was investigated, whether the isolated spinal cord can produce differentiated changes of regional sympathetic activity as a response to central cold stimulation. Selective cooling of the thoraco-lumbar spinal cord in chronically spinalized rabbits induced an increase in vasoconstrictor tone of the ear skin vessels as indicated by a drop of ear skin temperature at constant core and ambient air temperatures. Simultaneously, a decrease of activity in a splanchnic nerve branch was observed. Arterial pressure and heart rate remained unaffected on the average. 24 h after spinal transection, this response seemed to be less pronounced than 3 or more days after the operation. The presented results show that the pattern of regional vasomotor responses induced by central cold stimulation is, on principle, identical in intact and chronically spinalized rabbits. Therefore, the vasomotor pattern described in spinalized animals seems to represent a thermoregulatory response mediated by a vicarious spinal control system.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2013
    Keywords: Temperature Regulation ; Extracerebral Deep Body Thermosensitivity ; Intra-Abdominal Temperature Sensors ; Spinal Temperature Sensors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In rabbits, intra-abdominal temperature sensors of the dorsal wall of the abdominal cavity were selectively stimulated by means of thermodes perfused with water of temperatures ranging from 12–50°C. Respiratory acceleration and vasodilatation of the skin could be elicited as thermoregulatory responses by intraabdominal warming. By intra-abdominal cooling a depression of an elevated respiratory frequency could be induced. This depressing effect was already fully developed at a perfusion temperature of 36°C and could not be further augmented by stronger cooling. Neural afferent activity recorded from filaments of the N. splanchnicus was found to increase with rising perfusion temperatures beginning with 36–37°C. It is concluded from these results that abdominal thermosensitivity is predominantly a warmth-sensitivity in contrast to spinal cord thermosensitivity which comprises both cold and warmth sensitivity. Heating intensities and heat inputs, respectively, of equally effective periods of spinal cord and intra-abdominal warming were compared with each other. It was found that heat input into the abdominal thermode had to be four times greater than that supplied to the vertebral canal thermode in order to evoke identical responses. Simultaneous application of equally effective thermal stimuli to the abdomen and the spinal cord reinforced the thermoregulatory responses.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2013
    Keywords: Temperature Regulation ; Regional Sympathetic Activity ; Vasomotor System
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In anesthetized rabbits immobilized with succinyl choline, the discharges of sympathetic efferents supplying cutaneous and visceral regions were simultaneously recorded. The effects of thermal stimulation of the hypothalamic region were tested on the basis of the integrated discharges. During hypothalamic heating cutaneous sympathetic activity decreased, corresponding to increased ear blood flow, while visceral sympathetic activity increased. During hypothalamic cooling there was, on the average, no significant change of regional sympathetic activity. However, in single experimental periods an increase of cutaneous and a decrease of visceral sympathetic activity was found. The observed responses of regional sympathetic activity were compared with findings about regional cutaneous and intestinal blood flow under the same thermal stimulus and further with corresponding former investigations on regional blood flow and regional sympathetic activity during spinal thermal stimulation. It is suggested by this comparison that regional differentiation of sympathetic activity represents a specific thermoregulatory response of the vasomotor system mediated by the hypothalamic thermoregulatory center.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2013
    Keywords: Two-Kidney-Goldblatt Hypertension ; Renin Containing Granules ; Epitheloid Cells of Afferent Arterioles ; Morphology of Formation of Secretory Granules ; Hyporeninemia ; Renal Cortical Renin ; Plasma Renin Activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Renal cortical and plasma renin activities and the electron microscopic appearance of juxtaglomerular epitheloid cells were investigated in the unclamped renin-depleted kidney of rats with two-kidney-Goldblatt hypertension after removal of the clamped kidney. Within 24 h the renal renin content fell to still lower values, on the 2d day, it rose to one half its normal value, on the 7th day it reached its control value. Renin activity of plasma did not significantly differ from zero until the 3d day after removing the clamped kidney, reached 20% of normal on the 7th day and normal values between the 7th and the 21 st day. Sparse secretory granules appeared in the remaining renal cortex 12 h after removal of the clamped kidney. After 24 h secretory granules were formed by confluence of Golgi vesicles. After 2 days cisternae appeared in the rough-surfaced endoplasmic reticulum. After 4 days the electron-microscopic picture became normal. Renin appears to be elaborated in the rough-surfaced endoplasmic reticulum and concentrated into granules by the Golgi-apparatus. A fraction of the renal renin does not appear to be available for secretion.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-2013
    Keywords: Temperature Regulation ; Peripheral Thermal Stimulation ; Regional Sympathetic Activity ; Vasomotor System
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Thermal stimuli applied to roughly one half of the body skin in anesthetized and paralyzed rabbits evoked antagonistic changes of regional sympathetic activity. Peripheral cooling resulted in an increase of cutaneous sympathetic activity, while visceral sympathetic activity decreased. Peripheral heating induced a decrease of cutaneous sympathetic activity and simultaneously an increase of visceral sympathetic activity. The same antagonism has been found during central nervous thermal stimulation at different levels. This identity of vasomotor patterns reveals that qualitative differentiation of regional outflow represents a typical thermoregulatory response of the sympathetic system.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0570-0833
    Keywords: Electroplating ; Plastics ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electroplated plastics combine many advantages of plastics and of metals; they have the low weight and ease of shaping of plastics, together with the luster, hardness, and electrical conductivity of metals. An important part of any process for the electroplating of plastics is a pretreatment to ensure good adhesion of the metal film. Etch activation in the straight-through method requires only six steps for pretreatment.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Single crystals of the system CdCr2(S1-xSex)4 have been prepared by chemical transport with I2/AlCl3 mixtures and by flux growth from solutions in molten CdCl2.
    Notes: Im System CdCr2(S1-xSex)4 wurden Einkristalle durch Transportreaktion mit J2/AlCl3-Gemischen als Transportmittel und durch Kristallisation aus CdCl2-Schmelzlösungen hergestellt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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