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  • Other Sources  (7)
  • Inst. f. Geophys., Ruhr-Univ. Bochum  (3)
  • Taylor & Francis  (3)
  • AMS (American Meteorological Society)
  • Cambridge University Press
  • 2000-2004
  • 1980-1984
  • 1975-1979  (7)
  • 1950-1954
  • 1979  (7)
  • 1
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    Stapelung, Migration und Dekonvolution von Reflexionsseismogrammen an zyklisch geschichteten Störungen (1979)
    Inst. f. Geophys., Ruhr-Univ. Bochum
    In:  Berichte, Reihe A, Clausthal, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 10, no. 8, pp. 341-343, (ISBN 0 08 042822 3)
    Details
    Publication Date: 1979
    Keywords: Filter- ; Layers ; Stacking ; Deconvolution ; seismic Migration ; Reflection seismics
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Gesteinsphysikalische Daten des Falkenberger Granits (1979)
    Inst. f. Geophys., Ruhr-Univ. Bochum
    In:  Jahresbericht 1979, Teilprojekt Ruhr-Univ. Bochum, BMFT-ET-Vorhaben 4159/CEC-Projekt E 8 (D), Az.: 7084404, Ru 79/4, Hannover, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 1034, no. 2-90/91, pp. 154-168, (ISBN 3-933346-037)
    Details
    Publication Date: 1979
    Keywords: Stress
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Bestimmung der Bruchzähigkeit und der spezifischen Oberflächenenergie von Gesteinen im Dreipunkt-Biegeversuch (1979)
    Inst. f. Geophys., Ruhr-Univ. Bochum
    In:  Diplomarbeit, Düsseldorf, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 10, no. 379, pp. II.496-II.505, (ISBN 0 08 042822 3)
    Details
    Publication Date: 1979
    Keywords: Elasticity ; Fracture ; Instruments ; Energy (of earthquakes) ; Laboratory measurements
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    The peripheral fields of octopusstellar nerves (1979)
    Taylor & Francis
    In:  Marine Behaviour and Physiology, 6 (1). pp. 25-31.
    Details
    Publication Date: 2020-07-14
    Description: Afferent activity in the stellar nerves of Octopus vulgaris has been recorded in response to a probe applying a mechanical stimulus of approximately 5 gm/mm2 to the inner surface of the mantle. Mechanical sensitivity is distributed throughout the mantle surface and there is a large degree of overlap between the peripheral fields of nearby stellar nerves but no overlap of either ventral or dorsal midline. The afferent activity probably results from stimulation of sensory receptors located in the mantle and skin, but antidromic discharge in motor fibres is also possible.
    Type: Article , PeerReviewed
    Format: text
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  • 5
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    On the use of ammonium for buoyancy in squids (1979)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 59 (02). p. 259.
    Details
    Publication Date: 2020-07-16
    Description: Squids (teuthoids) fall into two distinct groups according to their density in sea water. Squids of one group are considerably denser than sea water and must swim to stop sinking; squids in the other group are nearly neutrally buoyant. Analyses show that in almost all the neutrally buoyant squids large amounts of ammonium are present. This ammonium is not uniformly distributed throughout the body but is mostly confined to special tissues where its concentration can approach half molar. The locations of such tissues differ according to the species and developmental stage of the squid. It is clear that the ammonium-rich solution are almost isosmotic with sea water but of lower density and they are present in sufficient volume to provide the main buoyancy mechanism of these squids. A variety of evidence is given which suggests that squids in no less than 12 of the 26 families achieve near-neutral buoyancy in this way and that 14 families contain squids appreciably denser than sea water [at least one family contains both types of squid]. Some of the ammonium-rich squids are extremely abundant in the oceans.
    Type: Article , PeerReviewed
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  • 6
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    The Wadi Natrun: Chemical composition and microbial mass developments in alkaline brines of Eutrophic Desert Lakes (1979)
    Taylor & Francis
    In:  Geomicrobiology Journal, 1 (3). pp. 219-234.
    Details
    Publication Date: 2015-03-10
    Description: Six lakes of the Wadi Natrun, Egypt, were studied with respect to the chemical composition of their brines and the occurrence of microbial mass developments. All investigated lakes showed pH values of approximately 11 and a total salt content of generally more than 30%. The main components were sulfate, carbonate, chloride, sodium, and minor amounts of potassium. Only traces of magnesium and calcium were present, but unusually high concentrations of organic carbon compounds, nitrogen compounds, and phosphate were found. Mass developments of phototrophic sulfur bacteria, halobacteria, cyanobacteria, and green algae were observed. The functions of complete nitrogen and sulfur cycles in the alkaline brines are discussed. The properties of the lakes and their ecology are compared with data on the Dead Sea and Great Salt Lake, Utah.
    Type: Article , PeerReviewed
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  • 7
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    Microbiological fractionation of stable sulfur isotopes: A review and critique (1979)
    Taylor & Francis
    In:  Geomicrobiology Journal, 1 (3). pp. 249-293.
    Details
    Publication Date: 2015-12-08
    Description: Microbiological transformations of sulfur compounds discriminate to various degrees between the stable sulfur isotopes 32S and 34S. Comparatively little is known on isotopic effects associated with sulfur‐oxidizing organisms, and the interpretation of results is complicated since the sulfur pathways are poorly defined and compounds containing two or more sulfur atoms at different oxidation states may be involved. Dissimilatory reduction of sulfate, and sulfite reduction by certain assimilatory microorganisms, causes particularly marked isotopic effects, the expression of which depends on the extent of reaction and other incompletely defined environmental conditions. Models have been proposed to account for these effects based on current knowledge of the reduction pathways. Many of the trends observed during dissimilatory sulfate reduction in the laboratory can also be found in the modern environment leaving little doubt that microbiological factors play a significant role in determining sulfur isotope distributions in nature. However, unusually large isotopic effects, rarely approached in the laboratory, are often observed in nature. The reasons for this are not entirely clear, but in sediments it is possible that diffusional isotopic effects are imposed on biological effects.
    Type: Article , PeerReviewed
    Format: text
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