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  • Springer  (87)
  • Oxford University Press  (16)
  • 1970-1974  (103)
  • 1
    Electronic Resource
    Electronic Resource
    Acceleration of the rate limiting step in norepinephrine biosynthesis by potassium (1970)
    Springer
    Cellular and molecular life sciences 26 (1970), S. 494-495 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Kalium erhöht die Bildung von markiertem Noradrenalin aus markiertem Tyrosin im isolierten Vas deferens. Es wird angenommen, dass dieser Effekt auf eine Steigerung der Tyrosin-Hydroxylase zurückzuführen ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01898465
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  • 2
    Electronic Resource
    Electronic Resource
    A comparative approach to fish respiration (1970)
    Springer
    Cellular and molecular life sciences 26 (1970), S. 113-122 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Es wird ein Überblick über neuere Forschungen gegeben, die das weite Arbeitsgebiet des Mechanismus der Fischatmung betreffen. Nachdruck wird auf den vergleichenden Standpunkt einer solchen Forschungsarbeit gelegt, wobei gezeigt wird, dass die Wahl besonderer Spezies ein förderndes Licht auf allgemein wichtige Probleme werfen kann, die bei Kiemenuntersuchungen sowohl auf der Makrostrukturstufe wie auf der Ultrastrukturstufe auftreten. Vom physiologischen Standpunkt aus gesehen, erweisen sich einige Arten auf Grund ihrer Lebensweise für experimentelle Untersuchungen ihres Sauerstoffverbrauchs besonders geeignet. Die strukturelle Anordnung des Pumpenmechanismus anderer Arten erleichert wiederum äusserst günstig die Direktmessung des Ventilationsvolumens und anderer mit dem Gasaustausch zusammenhängender Parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01895527
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  • 3
    Electronic Resource
    Electronic Resource
    Ecological energetics of Nerita (Archaeogastropoda, Neritacea) populations on Barbados, West Indies (1971)
    Springer
    Marine biology 11 (1971), S. 12-22 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348016
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  • 4
    Electronic Resource
    Electronic Resource
    Some observations of sea turtle nesting activity in Costa Rica (1972)
    Springer
    Marine biology 16 (1972), S. 297-309 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Low level aerial observations were used to obtain synoptic records of the distribution of sea turtle nesting activity along both coasts of Costa Rica. Pertinent environmental information was simultaneously recorded including beach characteristics, river effluents, and evidence of coastal currents. Other correlative information was obtained from detailed maps, current charts, and climatological data. On the Caribbean coast, as expected, green turtle (Chelonia mydas) nesting was concentrated on the beaches between the Tortuguero and Parismina Rivers. On the Pacific coast, two major nesting beaches for the Pacific ridley Lepidochelys olivacea were found, each having over 100 thousand turtles aggregated offshore during the peak period between September and November. Aggregations were present at least from July through December. Massed nesting occurs each year on these same beaches and the event is known as the “salida de flota” by the natives of Guanacaste Province. Numerous less important nesting beaches were also found. Nesting density did not correlate well with beach quality but, instead, appeared to be related to the proximity of the beach to offshore currents. Oceanic current systems apparently facilitate the transport of sea turtles to the general vicinity of the important nesting beaches on both coasts of Coata Rica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00347753
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  • 5
    Electronic Resource
    Electronic Resource
    Classification and ordination of benthic samples from Bedeque Bay, an estuary in Prince Edward Island, Canada (1971)
    Springer
    Marine biology 10 (1971), S. 227-235 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352811
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  • 6
    Electronic Resource
    Electronic Resource
    The nesting of the Pacific ridley turtle Lepidochelys olivacea on Playa Nancite, Costa Rica (1974)
    Springer
    Marine biology 24 (1974), S. 97-107 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study of the nesting of the Pacific ridley turtle Lepidochelys olivacea was undertaken in Costa Rica on Playa Nancite — one of two beaches on which the authors had, the previous year, discovered large nesting aggregations of this species. During the 3 1/2-month period of this study, approximately 288,000 turtles nested on the 1300 m-long beach. About 99% of these nested during 3 periods of mass-nesting (arribadas). The predictability of the arribadas was investigated by observing and recording environmental parameters with which they may be correlated. The mass-nesting phenomenon, aspects of nesting behavior, and the adaptive advantages of mass-nesting are discussed. During the period of study, nearly 2,000 turtles were tagged, 102 of which were subsequently recovered. Carapace lengths and widths of 251 tagged turtles were measured. The emergence of hatchlings was recorded daily and, from these data, the incubation period and an indication of egg and hatchling survival was obtained. The activities of the various predators on eggs, hatchlings, and adults are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389343
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  • 7
    Electronic Resource
    Electronic Resource
    Cardiac and respiratory responses in the climbing perchAnabas testudineus (1973)
    Springer
    Journal of comparative physiology 84 (1973), S. 205-226 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The heart rate ofAnabas is about 40 beats/min when breathing water and air. Tachycardia occurs as the fish takes an air breath and the rate declines as the breath holding continues but water breathing stops. Bradycardia is observed during this later phase. By the time the next air breath is taken, the heart rate has dropped to 15–30 beats/min. The heart rate of a fish breathing normoxic water but prevented from surfacing is about 42/min. Bradycardia occurs in hypoxic water under similar conditions. Tachycardia is observed in active fish when breathing hypercarbic water and air. On exposure to air bradycardia is found in resting fish but tachycardia occurs during activity. In air,Anabas usually repeats a breath when the heart rate drops to 15–25 beats/min. Tachycardia occurs immediately following an air breath. Heart rate then returns over a period of 3–6 mins to the normal resting level of 30 beats/min. The gas composition of the suprabranchial chambers has been measured and its relationship with the occurrence of an air breath, tachycardia and bradycardia is described. The experimental results are discussed in relation to the anatomy of the blood supply to the respiratory organs. The possible role of respiratory gases and pH in the control of breathing and perfusion is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697607
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  • 8
    Electronic Resource
    Electronic Resource
    A modified extraction method for determination of mineral oil in sea water (1973)
    Springer
    Bulletin of environmental contamination and toxicology 10 (1973), S. 170-171 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01720699
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  • 9
    Electronic Resource
    Electronic Resource
    The evaluation of histamine antagonists in man (1971)
    Springer
    European journal of clinical pharmacology 3 (1971), S. 215-220 
    Details
    ISSN: 1432-1041
    Keywords: Antihistaminics ; triprolidine ; histamine ; experimental design ; cyclizine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00565009
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  • 10
    Electronic Resource
    Electronic Resource
    A note on Marshallian and von Neumann-Morgenstern utility (1973)
    Springer
    Theory and decision 3 (1973), S. 371-376 
    Details
    ISSN: 1573-7187
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract The curvature of a decision maker's utility function is often used to measure his risk preference. In order to comprehensively describe an individual's decision making behaviour, however, it would also seem desirable to measure the gain in utility from an increase in wealth or income before accounting for risk. If a small increase in wealth leads to a large utility gain, then it could be said that the individual's aspiration to achieve the wealth increase would be high. This aspiration, however, may be more than offset by the risk involved in obtaining this extra wealth and the individual's attitude towards risk. In the following paper it is shown how the marginal utility of Marshall can be used in a measure of aspiration with this measure then combined with the usual measure of risk preference to explain the shape of any individuals utility curve. Using these measures, a general utility curve for all income or wealth classes is postulated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00138194
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