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  • Other Sources  (6)
  • Springer  (4)
  • Cambridge University Press
  • 1980-1984  (2)
  • 1975-1979  (3)
  • 1965-1969  (1)
  • 1945-1949
  • 1
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    Molar Growth Yields, Respiration and Cytochrome Patterns of Beneckea natriegens when Grown at Different Medium Dissolved-oxygen Tensions (1975)
    Cambridge University Press
    In:  Journal of General Microbiology, 90 (2). pp. 237-246.
    Details
    Publication Date: 2020-07-24
    Description: The effect of medium dissolved-oxygen tension on the molar growth yield, respiration and cytochrome content of Beneckea natriegens in chemostat culture (D 0·37 hr-1) was examined. The molar growth yield (Y), the specific rate of oxygen (qo2) and glucose consumption, and the specific rate of carbon dioxide evolution were independent of the dissolved-oxygen tension above a critical value (〈 2 mmHg). However, the potential respiration rate increased with reduction in the dissolved-oxygen tension at values of the dissolved-oxygen tension well above the critical value. Changes in the cytochrome content occurred at dissolved-oxygen tensions well above the critical value. An increase in cytochrome c relative to cytochrome b was observed as the dissolved-oxygen tension was decreased. Reduction of the dissolved-oxygen tension to less than 1 mmHg caused a switch to fermentative metabolism shown by the apparent rise in Y o2 and decrease in the molar growth yield from glucose. At this point the potential respiration rate (q o2) increased to its highest value, while the cytochrome pattern reverted to that observed at dissolved-oxygen tensions above 96 mmHg. There appeared to be no correlation between cytochrome content, potential q o2, in situ q o2, and cyanide sensitivity of the organism at various dissolved-oxygen tensions.
    Type: Article , PeerReviewed
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  • 2
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    Stress and Strain - Basic Concepts of Continuum Mechanics for Geologists (1976)
    Springer
    In:  New York, Springer, vol. 1, no. 1, pp. 65-66, (ISBN 0 340 76405 8)
    Details
    Publication Date: 1976
    Keywords: Stress ; Textbook of geophysics ; Textbook of geology ; Elasticity
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Geophysical prospecting on the Santorini Islands (1984)
    Springer
    In:  Bulletin of Volcanology, 47 (3). pp. 447-466.
    Details
    Publication Date: 2017-05-05
    Description: A program of geophysical research was carried out as a preliminary stage of study of the Santorini volcanic group. This area is of remarkable geothermal and volcanological interest, and the definition of a volcanological structural model is the starting point for an understanding of the local geodynamic processes. Gravity, magnetic and geoelectrical data proved that: (i) the core of the volcanic edifice consists of a sedimentary-metamorphic basement; (ii) the basement is tectonically disturbed and a linear tectonic system produces a graben-type structure in the middle part of the area.
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  • 4
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    The motion of a spherical liquid drop at high Reynolds number (1968)
    Cambridge University Press
    In:  Journal of Fluid Mechanics, 32 (2). pp. 367-391.
    Details
    Publication Date: 2020-03-11
    Description: The steady motion of a liquid drop in another liquid of comparable density and viscosity is studied theoretically. Both inside and outside the drop, the Reynolds number is taken to be large enough for boundary-layer theory to hold, but small enough for surface tension to keep the drop nearly spherical. Surface-active impurities are assumed absent. We investigate the boundary layers associated with the inviscid first approximation to the flow, which is shown to be Hill's spherical vortex inside, and potential flow outside. The boundary layers are shown to perturb the velocity field only slightly at high Reynolds numbers, and to obey linear equations which are used to find first and second approximations to the drag coefficient and the rate of internal circulation.
    Type: Article , PeerReviewed
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  • 5
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    Infrared and Mössbauer Studies of Reduced Nontronites (1979)
    Springer
    In:  Clays and Clay Minerals, 27 . pp. 63-71.
    Details
    Publication Date: 2020-05-18
    Description: Infrared and Mössbauer spectroscopy show that the extent of the reduction of nontronite is dependent on the chemical composition of the nontronite and on the nature of the reducing agent. Hydrazine reversibly reduces about 10% of the iron in all of the nontronites studied irrespective of composition and it is suggested that the resulting ferrous iron occurs only in distorted octahedral sites. Similar conclusions are reached for the dithionite reduction of the nontronites containing little tetrahedral iron, but for those with more than one in eight silicons replaced by iron, changes brought about by dithionite treatment are irreversible due to dissolution of appreciable quantities of iron. Results from both spectroscopic techniques suggest that iron in tetrahedral sites is preferentially dissolved and that up to 80% of the structural iron can be reduced. Evidence is presented for the formation in these extensively reduced nontronites of a small amount of a mica-like phase resembling celadonite or glauconite, and, as dithionite is used for the pretreatment of soils, the implication of this observation is briefly discussed. The use of deuterated hydrazine as a reducing agent has enabled the nontronite absorption band near 850 cm-1 to be assigned to a Si-O (apical) stretching vibration, which is inactive in the infrared for perfect hexagonal symmetry, but which is activated by distortions in the tetrahedral layer
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  • 6
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    On the architecture and function of cuttlefish bone (1983)
    Springer
    In:  Journal of Materials Science, 18 (7). pp. 2081-2086.
    Details
    Publication Date: 2021-08-02
    Description: The internal shell of the cuttlefish, which acts as a rigid buoyancy tank, is structured to combine high compressive strength — since it must withstand the external hydrostatic pressure — with minimum weighT. The micro-architecture of cuttlebone has been examined by electron microscopy and the relevance of the structure to the mechanical duties required of the shellin vivo are briefly discussed. The inorganic calcareous structure is associated with an organic component which may act as a template for mineralization.
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