Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Variations de la teneur en acide ascorbique dans les oeufs de Cancer pagurus et Palaemon serratus (Crustacea: Decapoda) au cours de l'embryogenèse (1975)
    Springer
    Marine biology 32 (1975), S. 357-363 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Variations of ascorbic acid content were studied during different stages of embryogenesis in the two crustaceans Cancer pagurus and Palaemon serratus. Variations in the egg volume of P. serratus were also measured at each stage of embryogenesis. The eggs appeared able to synthesize ascorbic acid during the earlier embryonic stages. Ascorbic acid changes in the crustaceans' eggs are discussed in relation to the variations of proline, chitin, glycogen and glucose already studied. Ascorbic acid appears to play an important role in the survival of eggs incubating under unfavourable environmental conditions. Before hatching, the ascorbic acid content is as high as after spawning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388993
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Variations saisonnières de la composition en acides gras chez Penaeus japonicus (Crustacea: Decapoda) (1975)
    Springer
    Marine biology 29 (1975), S. 335-341 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The lipid and fatty acid composition of male and female Penaeus japonicus Bate was investigated over a period of 11 months to determine the effects of environmental and nutritional factors such as temperature and starvation. The lipid content of the prawns increases from May to November, whereas water content decreases. We observed a time-lag between the highest lipid rate of males (in November) and that of females (in October); this is probably related to ovarian metabolism. From September to March, the high lipid content of the females coincided with a high percentage of monounsaturated fatty acids (especially 16:1 and 18:1). Winter starvation induces a decrease in palmitic acid content. As temperature decreases, the monounsaturated (16:1, 18:1) and polyunsaturated (20:4, 20:5, 22:6) fatty acids increase at the expense of the saturated fatty acids (16:0, 18:0) in the adult prawn. However, in post-larvae and juveniles, this increased rate of polyunsaturated fatty acids would be related to their particular lipid metabolism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388853
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Comparative study of vanadium biokinetics in three species of echinoderms (1982)
    Springer
    Marine biology 67 (1982), S. 127-134 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Vanadium-48 (as vanadate) was used to study the uptake, tissue distribution, depuration and food-chain transfer of vanadium through 3 species of echinoderms: the seastar Marthasterias glacialis L., the sea urchin Paracentrotus lividus Lmk. and the holothurian Holothuria forskali D.Ch.; all were collected from the littoral zone near Monaco. Uptake by all species was relativelyslow; after 3 wk exposure, isotopic equilibrium had not been reached and whole-body concentration factors ranged from 5 and 7 in the holothurian and sea urchin, respectively, to 18 in the seastar. Sixty-three to 77% of the incorporated radiotracer was associated with the body wall or test, suggesting surface sorption as the principal mechanism governing uptake from water. Stable vanadium measurements confirmed the preponderance of this element in the external hard parts of the echinoderms; however, concentration factors based on stable vanadium levels were significantly higher than those measured experimentally. Subsequent vanadium depuration rates were also species-dependent, with biological half-times for loss ranging from approximately 50 d in the sea urchin and holothurian to 123 d in the seastar. Food-chain transfer experiments indicated that seastars can assimilate and retain a large fraction of the vanadium ingested with food whereas sea urchins appear to lack this capability. The relative importance of the water and food input pathway in achieving vanadium levels in echinoderms is discussed in light of results of 48V distribution in experimental individuals and stable vanadium distribution in samples from the natural environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401278
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Experimental study on vanadium transfer in the benthic fish Gobius minutus (1992)
    Springer
    Marine biology 114 (1992), S. 349-353 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The radiotracer vanadium-48 was used to examine accumulation, assimilation, tissue distribution and elimination of vanadium in the benthic fish Gobius minutus (Pallas). After 3 wk exposure to 48V in sea water, mean whole-body concentration factors were low (∼0.8). The tissue distribution of 48V indicated that 48V accumulated from water penetrates little into internal tissues, muscle or liver, and is preferentially fixed in tissues in direct contact with the sea water. Concentrations of stable vanadium in fishes collected during summer 1988 from the littoral zone near Monaco displayed the same trends. Vanadium accumulated directly from water is rapidly lost, as evidenced by a 19 d biological half-life of 48V. Likewise, assimilation of vanadium through the food-chain is low; only 2 to 3% of 48V ingested with prey is retained in the tissues of the goby. The results suggest that the relatively low vanadium toxicity observed in benthic fish by other investigators is a consequence of the low degree of uptake of this metal from food or water. The relative importance of uptake from food and from water to the vanadium levels in benthic fish is discussed in the light of the 48V distribution recorded in experimental individuals and the distribution of stable vanadium in similar samples from the natural environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350025
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Etude comparée des teneurs en plutonium chez divers mollusques de quelques sites littoraux français (1977)
    Springer
    Marine biology 41 (1977), S. 263-267 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plutonium contents of various species of molluscs sampled from several sites along the French coast were measured in order to reveal any distributional patterns of the plutonium levels. The influence of the La Hague nuclear fuel reprocessing plant was apparent in the immediate proximity of the waste-disposal outfall (Ecalgrain Bay), and to a lesser degree in an oyster farming center situated about 50 km east of the Bay of Ecalgrain (St. Vaast-la-Hougue). Plutonium concentrations in molluscs from the remaining sites were quite comparable to levels that have been measured in similar species subject only to plutonium derived from atmospheric fallout. All molluscs, except those from Ecalgrain Bay, displayed higher levels of plutonium in the shell than in the soft parts, a finding in agreement with similar studies which have been reported recently. However, those individuals sampled from the vicinity of the outfall consistently displayed shell: soft parts plutonium ratios of less than 1. This difference may reflect different physico-chemical forms of this isotope present at the different sampling stations. With the exception of Crepidula fornicata shell, the tissues of filter-feeding molluscs do not appear to concentrate plutonium above the level found in other types of molluscs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394913
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Etude préliminaire, in situ, de la distribution du plutonium dans différents tissus et organes de Cancer pagurus (Crustacea: Decapoda) et de Pleuronectes platessa (Pisces: Pleuronectidae) (1976)
    Springer
    Marine biology 36 (1976), S. 13-17 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plutonium distribution was preliminary investigated in tissues and organs of the crab Cancer pagurus and the plaice Pleuronectes platessa collected inshore near the La Hague fuel reprocessing plant (France). There is an important transfer of plutonium from sea water to the gills and exoskeleton of the crab, these organs representing a large surface adsorption. In the plaice, only the gut strongly accumulates plutonium, indicating contamination by feeding. The edible parts of these two marine species, particularly the flesh, do not constitute, for man, an important source of contamination by environmental plutonium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388423
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Vanadium transfer in the mussel Mytilus galloprovincialis (1980)
    Springer
    Marine biology 56 (1980), S. 281-293 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Radiotracers were used to study processes controlling the accumulation and elimination of vanadium in the Mediterranean mussel Mytilus galloprovincialis. Vanadium uptake rates varied inversely with both salinity and vanadium concentration in water, but were independent of temperature. After a 3 wk exposure to 48V, the highest concentration factors were found in the byssus (≈1900) with much lower values computed for shell (≈ 70) and soft tissues (≈5). More than 90% of the total 48V accumulated was fixed to shell, suggesting that uptake is primarily a result of surface sorption processes. Much of the vanadium in shell was firmly bound to the periostracum and was not easily removed by acid leaching. Food-chain experiments indicated that the assimilation coefficient for ingested vanadium is low (≈7%) and that the assimilated fraction is rapidly excreted from the mussel. These findings coupled with knowledge of in situ and experimentally-derived vanadium concentration-factors have allowed a preliminary assessment of the relative importance of the food and water pathways in the contamination of mussels under conditions of acute and chronic exposure. Contaminated mussels transferred to clean sea water lost 48V at rates that depended upon temperature but were largely unaffected by either salinity or by vanadium levels in mussel tissues. Total vanadium depuration was slow and was governed by loss from a slowly-exchanging compartment with a characteristic half-time of about 100 d. Individual mussel tissues were analyzed for stable vanadium and the possibility of using these tissues, particularly the byssus, as bioindicators of ambient vanadium levels in the marine environment is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386866
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    The effects of a fat-free diet and compounded diets supplemented with various oils on moult, growth and fatty acid composition of prawn, Penaeus japonicus Bate
    Amsterdam : Elsevier
    Aquaculture 7 (1976), S. 245-254 
    Details
    ISSN: 0044-8486
    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/10.1016/0044-8486(76)90143-5
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    High concentrations of some heavy metals in tissues of the mediterranean octopus (1980)
    Springer
    Bulletin of environmental contamination and toxicology 24 (1980), S. 783-788 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01608189
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Culture of an autoflocculent microalga in a vertical tubular photobioreactor for phycoerythrin production (1995)
    Springer
    Biotechnology techniques 9 (1995), S. 185-190 
    Details
    ISSN: 1573-6784
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A red microalgal, Rhodosorus marinus, was used to produce phycoerythrin. This autoflocculent species, grown in a vertical tubular photoreactor equipped with a gaz-lift system, achieved a growth rate of 0.029 h-1 with a maximum biomass yield of 2 g.l-1 dry weight. These values were close to those obtained in batch cultures of other red microalgae cultured as free cell suspensions. Results have shown that these algae could be grown efficiently in natural seawater enriched with nutrients and harvested by decantation followed by filtration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157076
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...