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  • 1
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    The Vibroseis Source (1990)
    Elsevier
    In:  Amsterdam, Elsevier, vol. 3, pp. 6322, (ISBN 0-521-79203-7)
    Details
    Publication Date: 1990
    Keywords: Textbook of geophysics ; Seismics (controlled source seismology) ; Applied geophysics ; Vibroseis
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Fractal Models in the Earth Sciences (1992)
    Elsevier
    In:  Amsterdam, Elsevier, vol. 54, no. XVI:, pp. 9-66, (ISBN: 3486274473, 2. Auflage 2004, xxiv, 244 Seiten)
    Details
    Publication Date: 1992
    Keywords: FractureT ; Geol. aspects ; Seismicity ; Statistical investigations
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Anatomy of Seismograms (1990)
    Elsevier
    In:  Amsterdam, Elsevier, vol. 1, no. 22, pp. 65-70, (ISBN 3-7643-0253-4)
    Details
    Publication Date: 1990
    Keywords: Seismology ; Textbook of geophysics
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Multi-genetic origin of reflectivity: A review of seismic reflection profiling of the continental lower crust and Moho (1992)
    Elsevier
    In:  Bull., Polar Proj. OP-O3A4, Continental Lower Crust, Amsterdam, Elsevier, vol. 4, no. Subvol. b, pp. 45, (ISBN 0080419208)
    Details
    Publication Date: 1992
    Keywords: Reflectivity ; Review article ; Reflection seismics ; CRUST ; Meissner
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Distribution and abundance of the octopus Eledone cirrhosa in the Tyrrhenian Sea, Central Mediterranean (1992)
    Elsevier
    In:  Fisheries Research, 13 (1). pp. 53-66.
    Details
    Publication Date: 2020-07-31
    Description: Distribution and abundance of the horned octopus Eledone cirrhosa in the Tyrrhenian Sea are described on the basis of stratified-random bottom trawl surveys in spring and summer of the years 1985–1987. Specimens were caught between 25 and 630 m depth (higher densities between 50 and 200 m depth); mature males were found to prefer deeper bottoms than mature females. Young specimens occurred in spring samples from the Western Ligurian Sea and in summer samples from the Lower Tyrrhenian Sea, but were scarcely represented in the Higher Tyrrhenian Sea. Thus recruitment seems to be progressively delayed later in the season from north to south. The greatest abundance was recorded in the Higher Tyrrhenian Sea; wide seasonal variations of minimum stock biomass estimates have been observed and total biomass decreased from 1985 to 1987 in the surveyed areas.
    Type: Article , PeerReviewed
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  • 6
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    Age and growth of the squid Sthenoteuthis pteropus (Oegopsida: Ommastrephidae) from the Central-East Atlantic (1992)
    Elsevier
    In:  Journal of Experimental Marine Biology and Ecology, 163 (2). pp. 261-276.
    Details
    Publication Date: 2017-03-29
    Description: An investigation was carried out on the morphology, growth and microstructure of statoliths of 833 specimens of Sthenoteuthis pteropus (Steenstrup) mantle length (ML): 2–548 mm collected in the open waters of the Gulf of Guinea in 1984–1988. Statolith morphology is similar to that of other species of the subfamily Ommastrephinae and is similar to the sibling species S. oulaniensis. Statolith development includes five stages resembling those of Illex illecebrosus and other ommastrephids. Statolith growth is characterized by negative allometry. Increments visible in ground sections of statoliths can be grouped into four main growth zones, differing mainly in colour and increment width. Age and growth rates of S. pteropus were calculated using increment counts. The life span of females of all size groups does not exceed 1 yr, that of males is 1–2 months shorter, probably due to preliminary mating. Instantaneous relative growth rage (G) of paralarvae is high (up to 16% of body weight (BW)). G values for juveniles decline, but remain relatively high (7–8% BW). Juveniles attain 100–110 mm ML by age 100–110 days. G values for adults are the lowest (1.8–2% BW), but daily growth rates reach maximum values (40–70 g per day in large females of 450–500 mm ML). Each ontogenetic phase of S. pteropus corresponds to features of morphology, growth and microstructure of the statolith.
    Type: Article , PeerReviewed
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  • 7
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    Determination of intracellular pH and PCO2 after metabolic inhibition by fluoride and nitrilotriacetic acid (1990)
    Elsevier
    In:  Respiration physiology, 81 . pp. 255-274.
    Details
    Publication Date: 2020-06-03
    Description: Mean intracellular pH (pHi) and PCO2 (PiCO2) have been analysed based on pH and total CO2 measurements in tissue homogenates. Tissues were sampled from undisturbed worms (Sipunculus nudus), squid (Illex illecebrosus), trout (Salmo gairdneri), toads (Bufo marinus), and rats. Homogenate metabolism was inhibited by the addition of potassium fluoride and nitrilotriacetic acid (NTA). Model calculations revealed that the influence of dilution, medium buffers, and contamination by extracellular fluids was negligible. In white muscle tissue the resulting pHi values were virtually the same as found in studies using DMO (dimethyloxazolidinedione). If large fractions of mitochondria were present (e.g. in heart muscle), DMO derived pHi values were considerably higher, probably representing overestimates. Homogenate derived pHi values are concluded to represent the effective mean pHi by taking into account pH gradients, and the volumes and buffering of cellular compartments. High time resolution and small variability make this method especially useful to assess rapid changes in pHi, e.g. in exercising animals.
    Type: Article , PeerReviewed
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  • 8
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    Metabolic responses of Halicryptus spinulosus (Priapulida) to reduced oxygen levels and anoxia (1992)
    Elsevier
    In:  Journal of Experimental Marine Biology and Ecology, 162 (2). pp. 229-241.
    Details
    Publication Date: 2018-03-16
    Description: The presented data on indirect and direct calorimetry in Halicryptus spinulosus, a species with prominent ecological significance in parts of the Baltic Sea, provide a basis for a better understanding of the metabolic adaptation of these animals to low oxygen availability in their environment. Metabolic rates in H. spinulosus were measured respirometrically as oxygen consumption and calorimetrically as heat dissipation. Oxygen uptake rates are in the range of M O2 = 3.81 ± 1.37 μmol O2·g−1 dry mass·h−1. Upon reimmersion into normoxic seawater after an anoxic incubation of 7 days, the animals exhibit an overshoot of oxygen consumption by a factor of 2.4. It takes at least 2 days for the animals to balance their oxygen consumption to previously measured rates. Direct calorimetry exhibits different strategies of H. spinulosus to cope with declining oxygen and anoxia. During the first 2 transitional days to anoxia in the calorimeter, the animals decreased heat dissipation moderately down to 53.4 and 26%, respectively, of aerobic values. The animals are not necessarily quiescent at the beginning of anoxia, but at the end of the experiments after 14 days metabolic rates have dropped substantially down to ≈2% of normoxic values. These findings are discussed with regard to an effective adaption to frequently changing oxygen regimes in deeper parts of the Baltic Sea.
    Type: Article , PeerReviewed
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  • 9
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    CO2 partial pressure in Northeast Atlantic and adjacent shelf waters: Processes and seasonal variability (1992)
    Elsevier
    In:  Journal of Marine Systems, 3 (6). pp. 453-463.
    Details
    Publication Date: 2018-03-15
    Description: CO2 partial pressure in surface water was measured in the Northeast Atlantic and in the Hebride Shelf/North Sea area during a cruise with R.V. Poseidon in June 1991. A mean pCO2 of 303 μatm was found in the Atlantic between 50°N and 60°N. For an atmospheric CO2 content of 357.5 ppm(v) this corresponds to a partial pressure difference of −55 μatm. This supports the view that the subarctic Atlantic is a significant sink within the CO2 cycle between the ocean and the atmosphere. A comparison of our measurements with other data reveals that the pCO2 distribution changes significantly during May/June. This explained by seasonal warming, CO2 exchange with the atmosphere and biomass production. The contribution by each of these processes to the seasonal variations is calculated. It was found that during a plankton bloom the production of biomass is the dominating factor and may lower seawater pCO2 by almost 100 μatm. The shelf areas are charactrized by strong pCO2 gradients which are explained by water exchange with the Atlantic, temperature effects and biomass production.
    Type: Article , PeerReviewed
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  • 10
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    Minor extension of the von Bertalanffy growth theory (1990)
    Elsevier
    In:  Fisheries Research, 9 (4). pp. 367-371.
    Details
    Publication Date: 2016-12-09
    Description: The growth of “Growing Sealife”™ plastic squid was tested against the principles of the von Bertalanffy growth theory. The von Bertalanffy growth curve fits the data well on visual inspection, although the Schnute curve actually provides a statistically superior fit. If the von Bertalanffy growth curve provides a reasonable fit to data, this is frequently interpreted as evidence for anabolic and catabolic changes. The results of this paper for plastic squid are intended to provide a warning that such an interpretation does not necessarily follow.
    Type: Article , PeerReviewed
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