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  • Wiley-Blackwell  (79,141)
  • International Union of Crystallography (IUCr)  (12,689)
  • 1980-1984  (49,046)
  • 1975-1979  (42,784)
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  • 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 Life Cycle Characteristics of Five Species of the Amphipod Genus Gammarus in the Baltic (1981)
    Wiley-Blackwell
    In:  Oikos, 37 (2). p. 173.
    Details
    Publication Date: 2015-10-06
    Type: Article , PeerReviewed
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  • 5
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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
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  • 6
    Electronic Resource
    Electronic Resource
    Misorientation contrast of crystal subgrain boundaries in Berg–Barrett X-ray micrographs (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 29-36 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A stereographic projection method of analysis has been developed for analyzing the misorientation contrast of crystal subgrain boundaries which are observed in Berg–Barrett X-ray micrographs. The boundary appearance is described in terms of the geometry of the boundary with respect to the crystal surface, the angular misorientation of the adjacent subgrains, and the X-ray diffraction conditions. The rotation axis for the misorientation of adjacent subgrains, including the sense of the rotation, and the amount of misorientation is determined from the width and relative contrast of the boundary in various images. Experimental results are described for subgrain boundaries in zinc crystals solidified along different crystallographic growth directions. The Burgers vectors of the dislocations composing the subgrain boundary are indirectly determined by this method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875009478
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  • 7
    Electronic Resource
    Electronic Resource
    Measurement of strain and lattice parameter in epitaxic layers (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 42-44 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A means of measuring strain and lattice parameter directly in epitaxic layers by `double-crystal' X-ray diffraction is presented. The method described has three major advantages; that it is achieved by a simple addition to a commercial goniometer; that the area of sample illuminated is defined solely by the collimator; and that single or double-crystal diffraction can be selected, simultaneously if needed, on exactly the same specimen area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875009491
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  • 8
    Electronic Resource
    Electronic Resource
    A silicon powder diffraction standard reference material (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 45-48 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A silicon powder Standard Reference Material, SRM-640, has been prepared for use as a standard in powder diffractometry. Powder diffraction measurements were performed with a tungsten internal standard and a high-angle goniometer. The measured a/λ is 3.525176. With λ(Cu Kα1 peak) taken as 1.5405981 Å, a = 5.430880 (35) Å, uncorrected for refraction. Comparison of a with values obtained with a single-crystal from one of the boules reveals a difference of 3 parts in 105. This difference suggests a subtle systematic error in powder diffractometry or a change in lattice spacing near crystal boundaries. Use of the SRM should permit individual measurements of lattice parameters to be made reproducible to near 1 part in 105 and an absolute accuracy of at least 3 parts in 105.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875009508
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  • 9
    Electronic Resource
    Electronic Resource
    The separation of displacement and substitutional disorder scattering: a correction for structure-factor ratio variation (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 111-114 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The assumptions in the Borie & Sparks [Acta Cryst. (1971). A27, 198–201] procedure for the separation of order- and displacement-dependent components of diffuse X-ray scattering from a binary system AB are examined with the use of the concentration deviation (spin-like) notation. The more limiting assumption, that the structure-factor ratio η = (mAfA + mBfB)/(fA−fB) is constant in reciprocal space, is shown to produce an incomplete separation for normal variations in η. A matrix-inversion method for completing the separation is suggested for those cases in which the approximate equality of the Debye–Waller factors (DWF) of the individual atomic species indicates that some terms of the scattering equation may be neglected. The extension suggested by Ramesh & Ramaseshan [Acta Cryst. (1971). A27, 569–572] that anomalous dispersion induced changes in η could be used to separate the atomic static displacement properties of the various atomic pairs is shown to require a change in η greater than the variation of η across the reciprocal-space volume. Some difficulties of obtaining such a change are pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875009740
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  • 10
    Electronic Resource
    Electronic Resource
    Positional information in solid-solution models (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 121-126 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The role of positional information in determining the thermodynamics of crystalline solid solutions is considered. It is noted that, with certain exceptions (e.g.b.c.c. Fe–B), such solutions can be classified as being exclusively either substitutional or interstitial with respect to each solute. Calculation of thermodynamic properties of intersitital solutions requires knowledge of the types of sites preferentially occupied by the solute. The problem of determining that occupancy is considered for several binary systems. A cumulant expansion technique, which meets with good success in describing dilute, high-temperature, interstitial solutions, is applied to the case of high-temperature binary substitutional systems of similar metals. The technique is shown to be of limited utility in this application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875009776
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