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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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    Chaotic Dynamics: An Introduction (1990)
    Cambridge University Press
    In:  Cambridge, Cambridge University Press, vol. 3, pp. 6322, (ISBN 0-521-79203-7)
    Details
    Publication Date: 1990
    Keywords: Textbook of physics ; Chaotic behaviour ; FractureT
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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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    Sandeels in the diets of seals: application of novel and conventional methods of analysis to faeces from seals in the Moray Firth area of Scotland (1990)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 70 (04). pp. 829-840.
    Details
    Publication Date: 2020-07-16
    Description: Serological methods for prey identification have been applied to detection of residues ofsandeel (Ammodytidae) protein in faeces of common seals (Phoca vitulina) and grey seals(Halichoerus grypus) from the Moray Firth, north-east Scotland. Antisera raised to muscleprotein from Ammodytes marinus were evaluated by testing their reactions with proteinextracts made from a range of North Sea fish species and protein residues in in vitro digestates,seal digestive tracts and seal faeces. It was concluded that, using fused rocketimmuno-electrophoresis, linkage of precipitin peaks from unknown samples with peaksfrom standard sandeel extract was a reliable indicator of the presence of sandeel in theunknown sample. Seasonal variation in the incidence of sandeels in common seal diet in theMoray Firth was examined by identifying otoliths, bones, and proteins, and all threemethods indicated that sandeels occurred in the majority of samples tested in the summer,but were less important during the winter. Proteins were detected in fewer samples thanotoliths, particularly in February and March. Possible reasons for this difference arediscussed. Serological identification of sandeel proteins is potentially applicable to dietarystudies on all marine predators.
    Type: Article , PeerReviewed
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  • 5
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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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  • 6
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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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  • 7
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    Some observations on the behaviour of adult squids, Loligo forbesi, in captivity (1990)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 70 (02). p. 459.
    Details
    Publication Date: 2020-07-16
    Description: Thirty-four adult individuals of Loligo forbesi (males and females with dorsal mantle lengths from 27–77 cm) were observed in captivity in a 3 m diameter closed sea-water system on Faial Island, Azores. Squids were caught by jigging and were fed with horse mackerel (Trachurus picturatus) and chub mackerel (Scomber japonicus), either alive or dead. The maximum survival was 73 days. Feeding behaviour was dependent upon both the size of prey and its state of preservation;e.g. the squid would eat the head of small fish (〈 about 15 cm), reject the head of medium-sized fish (about 15–35 cm) and would eat only the dorsal part of a big fish (〉 about 35 cm) or a fish poorly preserved. Seventeen chromatic, 9 postural and 6 movement components of body patterns were observed and described. Conspecific interactions considered to be aggression and dominance were observed among males; no such interactions occurred when one male and two females were kept together. Body patterns in relation to relaxation, stress, shock, feeding, locomotion and aggression are also described.
    Type: Article , PeerReviewed
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  • 8
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    The assessment of stocks of annual squid species (1990)
    Elsevier
    In:  Fisheries Research, 8 (4). pp. 335-350.
    Details
    Publication Date: 2017-01-18
    Description: Methodology for assessing squid fisheries is presented focusing on the estimation of exploitation rate, stock size and the fishing power of the vessels. The assessment is designed to provide input into management decisions for effort limited fisheries. The fishery for Illex argentinus around the Falkland Islands is used as an example for the methods. The development of a management policy for this fishery is described more fully in a related paper. The methods are based on modifications to standard Leslie-Delury analysis. Various regression methods are utilized depending on the number of fleets for which detailed data are available. The statistical procedures also yield estimates of the standard errors of the estimates for evaluating the assessment advice.
    Type: Article , PeerReviewed
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  • 9
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    Cephalopod biology in the fisheries context (1990)
    Elsevier
    In:  Fisheries Research, 8 (4). pp. 303-321.
    Details
    Publication Date: 2017-01-31
    Description: The biology of exploited cephalopod stocks is reviewed. Individual growth rates are high, slowing drastically or becoming erratic at sexual maturity. Growth estimates depend on aquarium studies and population modal analysis. In some cases, ring markings in the statolith appear to be age-related, but at present there is no generally applicable method of age determination. Sexes are separate and fertilization is normally by direct mating. Rapid maturation is followed by a single spawning season and, with few exceptions, an early death. Methods for estimation of fecundity are poorly developed. Annual recruitment to the population is essential and depends critically on each year's breeding success and the survival of eggs and hatchlings. Many cephalopod species have a planktonic stage of variable duration but no specialized larval stages. Cephalopods are carnivorous animals with very high gross growth efficiency. They are also consumed in large quantities by higher trophic levels leading to suggestions that cephalopods are potentially capable of supporting significantly increased levels of exploitation. The difficulties of modelling these populations are recognized
    Type: Article , PeerReviewed
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  • 10
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    A periodic structure in the ‘pen’ chitin of the squid Loligo vulgaris (1990)
    Elsevier
    In:  Tissue and Cell, 22 (2). pp. 191-197.
    Details
    Publication Date: 2020-05-05
    Description: The organization of the chitin-proteoglycan in Loligo vulgaris pen was examined ultrastructurally and related to the molecular order indicated by X-ray diffraction. There is a centrosymmetric striated repeat of 22 nm in the system which is based upon dark and light bands of unequal width. The banding is orientated perpendicular to the direction of the major molecular axis of the chitin fibres. The chitin molecules are laid down in sheets with a mutual, though irregular, twist to produce a laminated ‘plywood’ material.
    Type: Article , PeerReviewed
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