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  • Wiley-Blackwell  (36,058)
  • International Union of Crystallography (IUCr)  (6,726)
  • 1975-1979  (42,784)
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Year
  • 1
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    Respiration and the effects of pressure on the mesopelagic vertically migrating squid Histioteuthis heteropsis (1978)
    Wiley-Blackwell
    In:  Limnology and Oceanography, 23 (4). pp. 735-739.
    Details
    Publication Date: 2020-11-05
    Description: The effects of hydrostatic pressure and dissolved oxygen concentration on oxygen consumption rates were examined in the mesopelagic, vertically migrating squid Histioteuthis heteropsis from southern California offshore waters. Elevated hydrostatic pressure (to 136 atm) had no significant effects on oxygen consumption rates at 5°C. Lox oxygen concentrations (〈0.5 ml O2 liter -1) depressed rates of oxygen consumption. These findings suggest that biosis may be necessary to supply the total nergy needs of this species at daytime depths in the oxygen minumum layer off southern California.
    Type: Article , PeerReviewed
    Format: text
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  • 2
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    The effects of salinity and temperature on the development and survival of fish parasites (1978)
    Wiley-Blackwell
    In:  Journal of Fish Biology, 12 (4). pp. 311-323.
    Details
    Publication Date: 2017-07-11
    Description: In brackish water the variety of marine and freshwater parasite species is considerably reduced. The distribution in brackish water of most marine endoparasites is restricted by the salinity tolerance of their hosts, most of the parasite species are more tolerant than their hosts. The influence of salinity and temperature on nine species has been examined; first stage larvae of Contracaecum aduncum develop in 0-32‰ salinity; Cryptocotyle lingua proved to be infective at salinities down to 4‰. The greatest resistance was found in Anisakis larvae from herring Clupea harengus, which survived for more than half a year. Parasites in the fish intestines appear to be unaffected by changing water salinities, as the osmolarity in the intestines stays nearly constant. Marine ectoparasites (Acanthochondria depressa, Lepeophtheirus pectoralis) survive about three times longer than freshwater species (Piscicola geometra, Argulus foliaceus) when salinity is 16‰. High temperature increases the effects of adverse salinities on parasites. There is evidence that none of these ecto-parasitic species can develop within the range of 7-20‰ salinity.
    Type: Article , PeerReviewed
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  • 3
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    Evidence for exploitative interspecific competition in mud snails (Hydrobiidae) (1976)
    Wiley-Blackwell
    In:  Oikos, 27 (3). pp. 367-376.
    Details
    Publication Date: 2017-03-31
    Description: Some of the basic assumptions implied in the theory of limiting similarity of coexisting competitors were investigated experimentally in the case of three congeneric, deposit feeding snails. The species show character displacement with respect to size when coexisting. In experimental containers with a natural substrate, interspecific, exploitative competition between snails of the same size range is as intense as intraspecific competition. Diatoms of a given size range, which constitute the most important food, show a "logistic" growth response to grazing, and individual growth of the snails is linearly related to diatom density. The previous observation that the snails show size dependent selection for ingested particle sizes is extended to show that this mechanism leads to a real resource partitioning between snails of different sizes. Size frequency distribution of diatoms in the sediment is a function of the sizes of grazing snails. Size selection of ingested sand grains may also be significant for resource partitioning since the migration rate of the attached microflora between sand grains seems to be slow relative to its growth on the individual sand grains.
    Type: Article , PeerReviewed
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  • 4
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    Habitat Selection and Distribution Patterns of Five Species of the Amphipod Genus Gammarus (1979)
    Wiley-Blackwell
    In:  Oikos, 33 (2). pp. 316-322.
    Details
    Publication Date: 2015-10-06
    Type: Article , PeerReviewed
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  • 5
    Electronic Resource
    Electronic Resource
    The analysis of X-ray diffraction profiles from imperfect solids by an application of convolution relations (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 6-9 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: In this investigation an attempt has been made to correlate the experimentally observed X-ray diffraction profile from imperfect solids with the one obtained theoretically from an approach of simultaneous convolution of the true diffraction profile resulting from the imperfection content of the materials and the instrumental profile, considering realistic distribution functions. The expressions for the intensity distributions are derived from the simultaneous convolution of Schoening's true profile (originating from the Gaussian strain profile and the Cauchy crystallite-size profile) and the instrumental profile having either Gaussian or Cauchy functional forms, and the theoretical forms are compared to those observed from some silver- and copper-base cold-worked alloys and vapour-deposited thin silver films. The agreement is fairly good for both first- and second-order reflections with small deviations in the tail region, which may arise from uncertainty in the background-level estimation, consideration of functions purely symmetrical in form and neglect of absorption and TDS effects. A further agreement of Schoening's true profile with Stokes's corrected deconvoluted true profile implies the validity of Schoening's approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889878012595
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  • 6
    Electronic Resource
    Electronic Resource
    Model drawing programs:production of diperiodic patterns (1976)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 9 (1976), S. 57-57 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889876010534
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  • 7
    Electronic Resource
    Electronic Resource
    Crystallographers (1976)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 9 (1976), S. 58-58 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889876010558
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  • 8
    Electronic Resource
    Electronic Resource
    On the dielectric behaviour of cadmium iodide polytypes (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 645-648 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The dielectric constants (εr) of cadmium iodide polytypes have been measured and found to be higher than that of the parent 4H structure. For example, whereas the εr for polytypic structures 32H and 34H is between 120 and 150, for the 4H structure it is between 20 and 25. A possible explanation for this decrease is suggested in terms of the occurrence of the stacking faults and their effect on the orientation polarizability of the cadmium iodide crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875011533
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  • 9
    Electronic Resource
    Electronic Resource
    Analyse des bandes de diffraction affectées par une fonction défaut instrumentale (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 653-656 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A turbostratic layer lattice is characterized by asymmetric X-ray diffraction bands the shape of which is a function of the average diameter L of the two-dimensional scattering domains. The mathematical relationship between the band shape and L is known. The larger the domains, the narrower and more asymmetric is the band. The band width is also influenced by the instrumental broadening. Consequently the apparent diameter L, is smaller than L. The proposed graphical method allows L to be obtained from L, and from the characteristic parameters of the apparatus. The experimental results can be fitted from the convolution of the theoretical function corresponding to L with the experimentally measured instrumental broadening function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875011557
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  • 10
    Electronic Resource
    Electronic Resource
    Ein neues Verfahren zur gleichzeitigen Photographie zweier Netzebenen des reziproken Gitters (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 670-673 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A new experimental technique in which direct photographs of two reciprocal planes are taken simultaneously is described. The method combines the advantages of the precession method (a series of reciprocal planes is accessible with the adjustment of a single reciprocal direction) and the de Jong Bouman method (high diffraction angles are possible). Consequently many crystals (e.g. organic ones) may be measured with copper radiation without loss of information. The advantages of the new method and the final construction for practical X-ray diffractometry are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875011570
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