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  • 1
    Electronic Resource
    Electronic Resource
    Accumulation of PSP toxins in Atlantic mackerel: seasonal and ontogenetic variations (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 50 (1997), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Atlantic mackerel Scomber scombrus are known to be lethal vectors of paralytic shellfish poisoning (PSP) toxins to predators. To elucidate dynamics of PSP toxin accumulation in this species, mackerel were sampled in the Gulf of St Lawrence from May to October 1993. Mackerel appear to retain toxins (saxitoxin, gonyautoxins 2 and 3) year-round. The toxin content of the liver, as determined by high performance liquid chromatography, increased significantly with fish age (r2=0.40) and length (r2=0.52), suggesting that mackerel progressively accumulate PSP toxins throughout their life. The toxin content of the liver also increased significantly during the summer feeding sojourn in the Gulf of St Lawrence. Comparison of profiles of saxitoxin derivatives indicated that zooplankton were the likely source of PSP toxins found in mackerel. The mean ± S.D toxin content was 17.4 ± 10.6 nmol liver−1 and the mean ± S.D. PSP toxicity was 112.4 ± 67.0 μg saxitoxin equivalents 100 g−1 liver wet weight (n=247).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb01648.x
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  • 2
    Electronic Resource
    Electronic Resource
    Expression of intermediate filament proteins in TPA-induced MPC-11 and HL-60 cells
    Amsterdam : Elsevier
    Experimental Cell Research 199 (1992), S. 363-372 
    Details
    ISSN: 0014-4827
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0014-4827(92)90446-F
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  • 3
    Electronic Resource
    Electronic Resource
    Interactions between 17β-estradiol and the hypothalamo-pituitary β-endorphin system in the regulation of the cyclic LH secretion
    Amsterdam : Elsevier
    Journal of Steroid Biochemistry 30 (1988), S. 161-168 
    Details
    ISSN: 0022-4731
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-4731(88)90089-1
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  • 4
    Electronic Resource
    Electronic Resource
    The involvement of estradiol at the time of implantation in placental mammals
    Amsterdam : Elsevier
    Animal Reproduction Science 7 (1984), S. 467-488 
    Details
    ISSN: 0378-4320
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0378-4320(84)90052-6
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  • 5
    Electronic Resource
    Electronic Resource
    Organizational fate of vimentin during redistribution of surface immunoglobulin in mouse splenic lymphocytes
    Amsterdam : Elsevier
    Cell Biology International Reports 11 (1987), S. 583-590 
    Details
    ISSN: 0309-1651
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0309-1651(87)90138-X
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  • 6
    Electronic Resource
    Electronic Resource
    Pubalgies et statique du bassin (1982)
    Springer
    Surgical and radiologic anatomy 4 (1982), S. 18-19 
    Details
    ISSN: 1279-8517
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Conclusion Il est certes difficile de transposer directement les résultats du cadavre au vivant. En outre, les insertions musculaires, très puissantes à ce niveau, modifient certainement les valeurs des contraintes symphysaires. Cependant, notre expérimentation nous paraît démontrer le rôle important de la bascule du bassin dans la détermination des contraintes symphysaires. De faibles variations angulaires entraînent des variations appréciables des contraintes. Une bascule antérieure du bassin entraîne une augmentation notable de celle-ci, dans les limites angulaires de notre étude. S'il est vraisemblable que des facteurs musculaires et tendineux entrent dans la genèse des pubalgies, et s'il est très probable que les troubles statiques aggravent ceux-ci, il nous semble que la statique du bassin par elle-même puisse jouer un rôle dans l'apparition des pubalgies, en faisant varier considérablement les contraintes symphysaires.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01811203
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  • 7
    Electronic Resource
    Electronic Resource
    Pubic pain and position of the pelvis (1982)
    Springer
    Surgical and radiologic anatomy 4 (1982), S. 69-72 
    Details
    ISSN: 1279-8517
    Keywords: Pelvis ; Pubic symphysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les auteurs ont constaté que la plupart des sportifs souffrant de pubalgies présentaient une hyperlordose lombaire avec bascule du bassin et horizontalisation du sacrum. Ils ont mesuré, sur quatre bassins de cadavres frais, la variation des contraintes au niveau de la symphyse en fonction de l'inclinaison du bassin dans le plan sagittal. Une telle bascule, entraîne une augmentation importante de la valeur des contraintes en compression, au niveau de la symphyse, quand le sacrum s'horizontalise. Ils émettent l'hypothèse que cette augmentation des pressions entre, du moins en partie, dans le déterminisme des pubalgies.
    Notes: Summary We have noticed that in the majority of those sportsmen who complain of pubic pain there is lumbar hyperlordosis with tilting of the pelvis and an abnormally horizontal sacrum. We measured in four pelves of fresh cadavers the relationship between inclination of the pelvis in the sagittal plane and strain within the symphysis pubis. Tilting of the pelvis produces a major increase in pressure at the level of the symphysis as the sacrum becomes more horizontal. We propose that this increase in pressure may, at least in part, account for the pubic pain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01811191
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  • 8
    Electronic Resource
    Electronic Resource
    Production of DMSP and DMS during a mesocosm study of an Emiliania huxleyi bloom: influence of bacteria and Calanus finmarchicus grazing (1996)
    Springer
    Marine biology 126 (1996), S. 609-618 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We investigated the influence of bacteria and metazooplankton on the production of dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS) during blooms of Emiliania huxleyi (Lohmann) Hay and Mohler in seawater mesocosms. The phytoplankton succession was marked by the rapid collapse of an initial Skeletonema costatum (Greville) Cleve bloom followed by a small E. huxleyi bloom. The collapse of the diatom bloom was accompanied by an increase in concentrations of dissolved DMSP (DMSPd) and bacterial abundance and activity (as determined by the thymidine incorporation technique). The increase in bacterial activity was followed by a rapid decrease in DMSPd concentrations which remained low for the rest of the experiment, even during the subsequent collapse of the E. huxleyi blooms. The absence of DMSPd and DMS peaks during the declining phase of the E. huxleyi blooms was attributed to the high bacterial activity prevailing at that time. The influence of metazooplankton grazing on DMSP and DMS production was investigated by adding moderate (24 mg dry weight m-3) and high (520 mg dry weight m-3) concentrations of Copepodite Stage V and adults of Calanus finmarchicus to two of four filtered (200 μm mesh net) enclosures during the E. huxleyi blooms. The addition of C. finmarchicus, even in high concentrations, had no apparent effect on the dynamics of E. huxleyi, suggesting that the copepods were not grazing significantly on nanophytoplankton. The addition of copepods in high concentrations favored an accumulation of chlorophyll a and particulate DMSP. These results suggest that copepods were preying on the herbivorous microzooplankton which, in turn, was controlling the biomass of nanophytoplankton. DMS production was also enhanced in the enclosure with maximum metazooplankton biomass, suggesting that the grazing of C. finmarchicus on microzooplankton containing DMSP may contribute to DMS production. These results provide strong support to the emerging idea that bacteria and metazooplankton grazing play a dominant role in determining the timing and magnitude of DMS pulses following phytoplankton blooms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351328
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  • 9
    Electronic Resource
    Electronic Resource
    Simultaneous nitrogen and silicate deficiency of a phytoplankton community in a coastal jet-front (1990)
    Springer
    Marine biology 104 (1990), S. 329-338 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The nutritional status of a phytoplankton community was investigated in a coastal jet-front located in the Gulf of St. Lawrence, Canada, in 1987. During the sampling period, the frontal community was mainly composed of the diatomsChaetoceros debilis, Skeletonema costatum, Thalassiosira gravida andC. pelagicus. As previously reported for the St. Lawrence, some frontal stations were depleted both in nitrate and silicate. At stations impoverished in nitrate, internal nitrate pool concentrations were low or undetectable, suggesting that cells had not, recently, been exposed to a nitrate flux which exceeded the nitrate assimilation rate. At these impoverished stations, however, ambient and intracellular concentrations of ammonium and urea were high, suggesting that the community was not nitrogen-deficient. The comparison between the ambient silicate concentrations and the silicate requirement (K s ) of the dominant diatoms suggests thatC. debilis andS. costatum were Si-deficient. This is further supported by the low silicate uptake rates and intracellular concentrations measured at the silicate impoverished stations. The silicate deficiency also resulted in a decrease in the seston and phytoplankton N:C ratios.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313275
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  • 10
    Electronic Resource
    Electronic Resource
    A new source of dimethylsulfide (DMS) for the arctic atmosphere: ice diatoms (1994)
    Springer
    Marine biology 121 (1994), S. 381-387 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We report the first evidence that pennate diatoms growing within the bottom layer of first-year ice in the Arctic produce significant amounts of particulate dimethylsulfoniopropionate (DMSPp) and dissolved DMSP+DMS. In 1992 in Resolute Passage, a tributary of Barrow Strait, DMSPp concentrations within the bottom layer of ice reached 1055 mg S m-3 at the end of the vernal bloom, a value one order of magnitude higher than the maximum value reported in antarctic ice. Bottom-ice concentrations in DMSPp and DMSPd+DMS were significantly correlated with the abundance of the dominant pennate diatom Nitzschia frigida. Intracellular concentration in DMSP of ice algae was very low (0.001 pg cell-1) at the end of April when algae were light-limited and reached 1.17 pg cell-1 in mid-May following an increase in light and algal growth. We calculate that the rapid release of the dissolved DMSP+DMS from the ice into surface waters following the ice break-up will generate a sea-to-air DMS flux of 0.7 mg S m-2 d-1, a pulse ten times higher than the mean arctic summer flux. We estimate that this 1-d pulse represents up to 5% of the annual DMS emission in the Arctic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346748
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