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  • Other Sources  (12)
  • Pergamon Press  (5)
  • NAFO  (4)
  • Springer  (2)
  • Am. Inst. of Physics
  • 1980-1984  (12)
  • 1
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    Localization of Two Brominated Metabolites, Aerothionin and Homoaerothionin, in Spherulous Cells of the Marine Sponge Aplysina fistularis(=Verongia thiona) (1983)
    Pergamon Press
    In:  Acta Zoologica, 64 (4). pp. 199-210.
    Details
    Publication Date: 2020-04-23
    Description: Energy dispersive X-ray microanalysis was used to localize the two brominated natural products (aerothinonin and homoaerothionin) in the tissues of a marine demosponge, Aplysina fistularis. Virtually all of these compounds were localized within the spherules of the spherulous cells in the mesohyl. This is the first localization of any secondary metabolite at the cellular or sub-cellular level in any marine invertebrate. In Aplysina fistularis, as in other species of the same genus studied by Vacelet, the spherulous cells are concentrated just beneath the exopinacoderm and just beneath the endopinacoderm of the excurrent canals. Moreover, there is electron microscopic evidence for degeneration of some spherulous cells throughout the mesohyl. Presumably, this degeneration can release some aerothionin and homoaerothionin, which are known to have antibiotic properties. After release from the spherulous cells, these brominated natural products could function (1) within the mesohyl to exclude some types of bacteria or to aggregate ingested bacteria and/or (2) within the boundary layer of the surrounding seawater for defense or offense, as considered in the discussion section.
    Type: Article , PeerReviewed
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  • 2
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    Microprocessor-controlled time domain reflectometer for dynamic shock position measurements (1980)
    Am. Inst. of Physics
    In:  Rev. Sci. Instrum., Veldhoven, Am. Inst. of Physics, vol. 51, no. 2, pp. 367-384, pp. 2141, (ISSN: 1340-4202)
    Details
    Publication Date: 1980
    Keywords: Seismology ; Instruments ; Nuclear explosion ; Data analysis / ~ processing
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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.
    Type: Article , PeerReviewed
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  • 4
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    Wind-driven inertial waves observed during Phase III of GATE (1980)
    Pergamon Press
    In:  Deep Sea Research Part A: Oceanographic Research Papers, 26A (Suppl. 1). pp. 217-224.
    Details
    Publication Date: 2020-08-04
    Description: Current and wind stress time series obtained from the F1-mooring are analysed with the aim of examining linear correspondences and testing the adequacy of linear coupling models at near-inertial frequencies. Significant linear correlations are found in the data set which are consistent with a linear winddriven model of the current system. The current in the mixed layer can be described by inertial oscillations directly forced by the local wind stress. A wind-driven simulation model of the mixed layer currents yields an energy input of 3.10-3 W/m2. The current in the thermocline can be described by a linear internal wave field of downward propagating wave groups driven via Ekman suction by the wind stress field. Internal waves are generated at a rate of 10-3 W/m2, consistently estimated from both kinematic and dynamic considerations.
    Type: Article , PeerReviewed
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  • 5
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    A note on near-surface VACM measurements made from three different kinds of surface moorings (1980)
    Pergamon Press
    In:  Deep Sea Research Part A: Oceanographic Research Papers, 26A (Suppl. 1). pp. 217-224.
    Details
    Publication Date: 2020-08-04
    Description: During a multi-institutional air-sea interaction experiment (GATE) in the central Atlantic North Equatorial Countercurrent in September 1974, vector-averaging current meter (VACM) measurements were made within the 30-m thick mixed layer from three different types of surface moorings. The moorings consisted of a single-point taut-line flexible mooring (E3), a spar-buoy (El), and a 2-legged mooring (Fl). Although the kinetic energy density spectral estimates of the E3, El, and Fl records in the low frequency range were equivalent with 95% confidence, the mean progressive vector diagrams differed by 6 % in length and 4 in direction. At frequencies above 1 cph the variances of the 7.2 m Fl current vectors were about 1.5 times larger than the 7.6 m E3 data and the spectral levels of the 20 m El and 21.4 m E3 record were equivalent, suggesting that VACM current vectors recorded near the surface beneath a surface-following buoy do not contain detectable amounts of aliased high-frequency mooring motion.
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  • 6
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    Counterillumination and the upper depth limits of midwater animals (1980)
    Pergamon Press
    In:  Deep Sea Research Part A. Oceanographic Research Papers, 27 (9). pp. 671-691.
    Details
    Publication Date: 2016-10-14
    Description: The maximum counterillumination intensities of three species of mesopelagic squids and one species of mesopelagic fish were determined in a shipboard laboratory. The values were compared with the intensity of downwelling irradiance in the ocean measured off Oahu, Hawaii. The upper depth limits of the mesopelagic fauna were determined by mid-day and moonlit-night trawling. The data support the hypothesis that limits on concealment from predation through counterillumination determine the upper depth limits of this fauna during the day. At night near full moon, however, animals may be found at light levels higher than those at which counterillumination seems to be an effective strategy.
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  • 7
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    Introduction to a collection of papers on GATE oceanography and surface layer meteorology (1980)
    Pergamon Press
    In:  Deep Sea Research Part A: Oceanographic Research Papers, 26 (Suppl. 1). pp. 1-8.
    Details
    Publication Date: 2020-08-04
    Type: Article , PeerReviewed
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  • 8
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    Predation by Atlantic Cod (Gadus morhua) on Short-finned Squid (Illex illecebrosus) off eastern Newfoundland and in the northeastern Gulf of St. Lawrence (1984)
    NAFO
    In:  Serial / Northwest Atlantic Fisheries Organization : N, 905 . pp. 1-16.
    Details
    Publication Date: 2020-06-19
    Description: In years of high abundance, the short-finned squid (Illex illecebrosus) was a common prey of Atlantic cod (Gadus morhua) in summer and autumn in both inshore and offshore waters of eastern Newfoundland and in the eastern and northern Gulf of St. Lawrence.The frequency of occurrence of squid in cod stomachs and the number of squid per stomach increased with cod length. The intensity of predation by cod on squid was low compared with peak predation on capelin (Mallotus villosus) and sand lance (Ammodytes sp.). Nevertheless, the annual immigration of squid in years of high abundance provided an increase in total food availability, especially for large cod.
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  • 9
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    Yield Analysis for the Long-finned Squid, Loli•o pealei (LeSueur) (1984)
    NAFO
    In:  Serial / Northwest Atlantic Fisheries Organization : N, 894 . pp. 1-29.
    Details
    Publication Date: 2020-06-19
    Description: A modified version of yield-per-recruit analysis wasused to estimate potential yields in the Loligo pealei fishery off the northe stern USA. The mode1 accepts monthly values of growth and fishing, spawning and natural mortality rates and assumes two cohorts per year class, as associated with pawning peaks. Two patterns of exploitation were examined by simulatting dominance of the international fishery (offshore, winter fishing coupled with the domestic inshore summer fishing) and the domestic fishery alone through varistion of the monthly pattern of fishing mortalita. Parameter estimates were derived from survey catch per tow and commercial catch data.
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  • 10
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    Embryonic development of the squid, Illex illecebrosus, and effect of temperature on development rates (1982)
    NAFO
    In:  Journal of Northwest Atlantic Fishery Science, 3 . pp. 41-45.
    Details
    Publication Date: 2020-06-18
    Description: Development stages for artificially fertilized and naturally spawned eggs of Illex illecebrosus were observed and a staging scheme proposed which relates to earlier studies on naturally spawned eggs of Illex coindetii and artificially fertilized eggs of Todarodes pacificus. Photographs and descriptions of stages provide a reference for embryonic development of small ommastrephid eggs and an aid to the identification of egg masses of the species in nature, an essential step in understanding its life cycle. Embryonic development in Illex illecebrosus fails at temperatures below 12.5°C. and the development rate at 21°C is nearly twice that at 12.5°C. This temperature requirement restricts the spatial and temporal distribution of spawning in this squid, and temperature-related development rates allow prediction of the age of egg masses found in nature in water masses of a particular temperature.
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