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  • Springer  (18)
  • Institute of Physics  (13)
  • Elsevier  (11)
  • 1975-1979
  • 1970-1974  (42)
  • 1940-1944
  • 1971  (42)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Celestial mechanics and dynamical astronomy 4 (1971), S. 295-308 
    ISSN: 1572-9478
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The equations of motion are derived for the case of a spinning satellite which has a central rigid body, and long flexible appendages which are nominally in the spin plane. The ‘major-axis theorem’ is found to be necessary, but not sufficient for this case, and appropriate sufficiency criteria are derived from a Liapunov function. The results are presented in a form amenable to satellite design.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Oecologia 7 (1971), S. 127-135 
    ISSN: 1432-1939
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Biocontent of the above-ground parts of ground vegetation in an alder-birch woodland was between 75 and 581.3 Kcal/m2 (16.05 and 137.70 g/m2). Species peaks did not necessarily coincide with the highest values for total ground vegetation. Ground vegetation litter biocontent was 1848.4 Kcal/m2 at the beginning of the study (April 1966) but rapidly fell to near 700 Kcal/m2 and remained near this level until April 1968. Net production by the above ground parts of the ground vegetation was 1016 Kcal/m2/yr (277.86 g/m2/yr) and 1142 Kcal/m2/year (280.20 g/m2/yr) in 1966–1967 and 1967–1968 respectively, measured as mortality plus net biocontent changes. These estimates were compared with those based on biocontent changes. Ground vegetation net primary production was not much smaller than tree litter fall (circa 1450 Kcal/m2/yr).
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 3 (1971), S. 215-220 
    ISSN: 1432-1041
    Schlagwort(e): Antihistaminics ; triprolidine ; histamine ; experimental design ; cyclizine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary A new method for evaluating histamine antagonists in man is described based on diminution of the effects of intradermal histamine. The inter and intra subject variability of such effects is examined experimentally and previous descriptions reviewed. Measures are adopted to minimise the effects and so achieve maximum economy of drug administrations and subjects. The method is exemplified by comparisons of activity of different preparations of triprolidine and of cyclizine and chlorcycline.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Marine biology 10 (1971), S. 227-235 
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract An attempt was made to identify the causes of the distribution of benthos within Bedeque Bay using multivariate techniques programmed for the computer. Both classification by a hierarchical cluster analysis, and ordination by principal components analysis suggested that a large proportion of the variance in the data was directly or indirectly correlated with a salinity gradient. Classification divided the species into two main groups, a in the upper half of the estuary where lower salinities and larger salinity fluctuations occurred, and group b in the lower half of the estuary with a more stable salinity regime. The group b species were further subdivided into those preferring soft mud and those preferring sandier sediments. The group a species were divided into a well-developed oyster association and various sub-groups less strongly associated with oysters. Five principal components were required to account for 50% of the variance in the data. The first axis accounted for 20% of the variance and was shown by a non-parametric test to be correlated with the salinity gradient. Axes II to V could not be interpreted, but possibly represented complex species interactions. By providing hard substrates and altering the natura of the sediment, oysters and mussels produced conditions suitable for many other species.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Marine biology 11 (1971), S. 12-22 
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Population energy budgets estimated on the assumption of steady state conditions for Nerita tessellata Gmelin, N. versicolor Gmelin, and N. peloronta L. on Barbados, W. Indies, are presented. Large differences in population structure, and hence energetics, occurred at different localities along the beach. Relatively high proportions (81 to 88%) of the assimilated energy were lost via metabolism. Assimilation efficiencies ranged from 39 to 43%, net growth efficiencies from 5 to 13%, and ecological efficiencies from 3 to 7%. For each species, production (P), energy flow (A) and total energy consumption (C) were expressed as functions of animal size, in order to facilitate gross estimations of the energy components for other populations for which data on size-frequency and density are available. Respiration studies of all three species in the laboratory failed to detect differences between respiration rates in air or under seawater.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Marine biology 9 (1971), S. 290-299 
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Nerita undata, N. plicata, N. polita, N. albicilla and N. textilis are common intertidal gastropods on Aldabra Atoll. Each species prefers a different level on the shore and/or different degrees of exposure to wave action. Patterns of zonation, population size-frequency structure and biomass are given. N. undata exhibits 2 distinct ecophenotypes. Normal types occur on expsed to moderately sheltered shores but are replaced by ‘type B’ in extremely sheltered conditions. Differences in shell morphology and population structure are also noted. Foraging by all species was confined to hours of darkness, generally at low tide. Activity of N. polita was induced slightly on overcast days. N. undata and N. textilis are cryptically coloured and often visible during the day. N. plicata is conspicuous, but is protected by a strong shell. N. polita and N. albicilla are often brightly and variably coloured, but both are concealed during daylight. No Nerita were found infected with trematodes, suggesting that the degree of infection was extremely low. Habitats of the Aldabran Nerita are compared with 3 species on Barbados, West Indies.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Primates 12 (1971), S. 91-93 
    ISSN: 0032-8332
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Canine teeth were extracted from seven adult male Japanese monkeys. Observations over the next four years led to the conclusion that canines are not essential for either the attainment or maintenance of high rank, but that they may play an important part in the self-defense of low-ranking males.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Medical & biological engineering & computing 9 (1971), S. 603-610 
    ISSN: 1741-0444
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Beschreibung / Inhaltsverzeichnis: Sommaire La résistance périphérique vasculaire, le volume de course, la sortie cardiaque et l'accélération maximum ont été calculés en ‘temps véritable’ en utilisant la pression aortique et les signaux d'écoulement préparés par des circuits analogiques simples incorporés dans un système d'enregistrement multi-canal. L'emploi du système a été exemplifié par les détails des effets haémodynamiques de la méthoxamine et de l'adrénaline chez des chiens anesthétisés et de la noradrénaline de l'isoprénaline et de l'éphédrine chez des chiens non anesthétisés. Ces techniques analogiques sont applicables aux études de la circulation chez l'homme.
    Kurzfassung: Zusammenfassung Es wurden peripherischer Gefässwiderstand, Schlagvolumen, Herzminuten-volumen und maximum Beschleunigung in ‘Real-Zeit’ unter Verwendung von Aortadruck und Flussignalen berechnet, welche durch einfache Analogschaltungen verarbeitet werden, die in ein Vielfach-Kanalschreibsystem eingebaut sind. Es wurden Beispiele für die Anwendung des Systems durch Registrierung der hämodynamischen Wirkungen von Methoxyamin und Adrenalin in betäubten Hunden und von Noradrenalin, Isoprenalin und Ephedrin in nicht betäubten Hunden gegeben. Diese Analogverfahren sind für Kreislaufuntersuchungen im Menschen anwendbar.
    Notizen: Abstract Peripheral vascular resistance, stroke volume, cardiac output and maximum acceleration were computed in ‘real-time’ using aortic pressure and flow signals processed by simple analogue circuits incorporated into a multichannel recording system. The use of the system was exemplified by records of the haemodynamic effects of methoxamine and adrenaline in anaesthetized dogs and noradrenaline, isoprenaline and ephedrine in unanaesthetized dogs. These analogue techniques are applicable to circulatory studies in man.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Publikationsdatum: 1971-06-01
    Print ISSN: 0584-8539
    Digitale ISSN: 1873-3824
    Thema: Chemie und Pharmazie , Physik
    Publiziert von Elsevier
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Publikationsdatum: 1971-09-01
    Print ISSN: 0038-1098
    Digitale ISSN: 1879-2766
    Thema: Physik
    Publiziert von Elsevier
    Standort Signatur Erwartet Verfügbarkeit
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