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  • 1
    Online Resource
    Online Resource
    Polychlorinated Biphenyls (PCBs) : Mammalian and Environmental Toxicology. (1987)
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Details
    Keywords: Polychlorinated biphenyls-Statistics. ; Polychlorinated biphenyls-Environmental aspects. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (158 pages)
    Edition: 1st ed.
    ISBN: 9783642705502
    Series Statement: Environmental Toxin Series ; v.1
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=6574276
    DDC: 363.7384
    Language: English
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    GEOMAR EBL
  • 2
    Electronic Resource
    Electronic Resource
    Dual reaction pathways in an open-chain Cope rearrangement (1971)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 93 (1971), S. 3985-3990 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00745a028
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    HYDRIDE REDUCTIONS OF THE CIS AND TRANS-DIBENZOYLSTILBENES1 (1955)
    s.l. : American Chemical Society
    The @journal of organic chemistry 20 (1955), S. 218-224 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01120a011
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The stereochemistry of chloride exchange in desyl chloride (1968)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 90 (1968), S. 3788-3790 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01016a033
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular systematics of vestimentiferan tubeworms from hydrothermal vents and cold-water seeps (1997)
    Springer
    Marine biology 130 (1997), S. 141-149 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Vestimentiferan tubeworms inhabit sulfide-rich environments associated with deep-sea hydrothermal vents and cold-water seeps at continental margins. Twelve species have been described, and several more await formal descriptions. As a group, these worms are best known for their lack of a digestive system in adults and their dependence on endosymbiotic bacteria that supply nutrients derived from chemoautotrophism. The taxonomic status of Vestimentifera has been debated since their discovery. Furthermore, relationships within the Vestimentifera have been difficult to determine by morphological criteria. Several species display considerable phenotypic plasticity, further confounding efforts to establish evolutionary relationships. We used a fragment of the mitochondrial cytochrome c oxidase subunit I gene to examine evolutionary relationships among vent-endemic species (Riftia pachyptila, Oasisia alvinae, Ridgeia piscesae, Tevnia jerichonana) and seep-associated species(Escarpia laminata, E. spicata, Lamellibrachia barhami, L. columna, and an undescribed species) of these worms. The molecular data placed these vestimentiferan taxa within the phylum Pogonophora. The pogonophoran clade (including vestimentiferans) was then linked to the Annelida. Examination of sequence divergence suggests that extant vestimentiferans constitute a recent evolutionary radiation that diversified as a paraphyletic assemblage of seep-associated taxa (including the genera Lamellibrachia and Escarpia) and then gave rise to a clade of vent-endemic taxa (genera Riftia, Oasisia, Ridgeia and Tevnia).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050233
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  • 6
    Electronic Resource
    Electronic Resource
    Evolutionary relationships of deep-sea hydrothermal vent and cold-water seep clams (Bivalvia: Vesicomyidae): results from the mitochondrial cytochrome oxidase subunit I (1997)
    Springer
    Marine biology 130 (1997), S. 151-161 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phylogenetic relationships among vesicomyid clams (Bivalvia: Vesicomyidae) and their placement within the order Heterodonta were examined using mitochondrial encoded cytochrome oxidase subunit I (COI) DNA sequences. The presently analyzed vesicomyids represent a recent monophyletic radiation that probably occurred within the Cenozoic. Nucleotide phylogenetic analyses resolved discrete clades that were consistent with currently recognized species: Calyptogena magnifica, C. ponderosa, Ectenagena extenta, C. phaseoliformis, Vesicomya cordata, Calyptogena n. sp. (Gulf of Mexico), C. kaikoi, C. nautilei, C. solidissima and C. soyoae (Type-A). However, specimens variously identified as: V. gigas, C. kilmeri, C. pacifica, and V. lepta comprised two “species complexes”, each composed of multiple evolutionary lineages. Most taxa are limited to hydrothermal-vent or cold-seep habitats, but the “vent” versus “seep” clams do not constitute separate monophyletic groups. Current applications of the generic names Calyptogena, Ectenagena, and Vesicomya are not consistent with phylogenetic inferences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050234
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of low oxygen concentrations on the hatching and viability of eggs of marine calanoid copepods (1992)
    Springer
    Marine biology 114 (1992), S. 241-247 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hatching of the eggs of four species of copepods, Acartia tonsa, Labidocera aestiva, Tortanus discaudatus, and Centropages hamatus was suppressed at oxygen concentrations less than 0.02 ml O2/l. When such eggs were subsequently exposed to normal oxygen concentrations, hatching varied among the species, indicating variability in the capacity of eggs to survive exposure to low oxygen. Incubation of eggs at low oxygen concentrations resulted in an increase in the duration of embryonic development. Experiments were conducted in closed systems and oxygen concentration was determined by thermal conductivity using gas chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349525
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of anoxia on the viability of subitaneous eggs of planktonic copepods (1994)
    Springer
    Marine biology 121 (1994), S. 83-87 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of anoxia on the viability (as evidenced by hatching) of newly spawned and fully developed subitaneous eggs of three species of copepods, Acartia tonsa (Dana), Centropages hamatus (Lilljeborg), and Labidocera aestiva (Wheeler) was determined for eggs produced in the laboratory by adults collected from inshore waters of the northeastern Gulf of Mexico between January and August 1992. Hatching success decreased to 50% or less when eggs were exposed to oxygen concentrations 〈0.06 mll-1 for more than 12 d, except for newly spawned eggs of L. aestiva, which still showed 50% survival after 32 d of exposure to anoxia. For all three species, newly spawned eggs survived exposure to anoxia longer than fully developed eggs. The results indicate that the increasing occurrence of anoxia in estuarine and coastal waters could have a major impact on the population growth of these important food web organisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349476
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Relationships between effects of environmental temperature and seston on growth and mortality of Mytilus edulis in a temperate northern estuary (1980)
    Springer
    Marine biology 57 (1980), S. 147-156 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The growth and mortality of experimentally-rafted Mytilus edulis L. of known age at 7 locations in a northern estuary (Damariscotta River, Maine, USA) were related to environmental temperatures and to the presence or absence of various potential food sources. All particles were regarded as potential food substrates. Growth decreased appreciably at sites where water temperatures exceeded 20°C, but mussels survived a wide range of elevated temperature exposures, ranging from 0 to 149 degree-days in excess of 20°C. The maximum temperature was 25°C. Mortalities of mussels at all sites but did affect the extent of mortality, which increased abruptly in late summer, when water temperatures were declining. Differences in degree-days of exposure to elevated temperatures did not influence the timing of mortality, which occurred synchronously at all times, but did affect the extent of mortality, which ranged from 35 to 90%. The period of high mortality was preceded by a rapid decline in phytoplankton standing crop. Total particle concentrations decreased during this period, but the shift toward larger particles suggests that there was little, if any, decrease in total volume of material in the seston, at least through August. It is suggested that living phytoplankton provided the critical energy source for these mussels, and that the mortalities were caused by rapidly reduced ration at a time of metabolic stress. The role of temperature and the possible role of the gametogenic cycle are discussed. In addition, the feeding efficiency of M. edulis may have decreased during this period due to an increase in mean particle diameter. Chlorophyll was divided into a nannoplankton fraction (〈-20 μm) and a larger fraction (〉20 μm). A smaller size criterion for this distinction is proposed for future studies. The importance of nannoplankton to the primary production of this estuary and the role of nannoplankton and nannoplankton-sized particles in the diet of mussels in nature are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390733
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  • 10
    Electronic Resource
    Electronic Resource
    Heterozygosity, growth, and survival of the hard clam,Mercenaria mercenaria, in seagrass vs sandflat habitats (1991)
    Springer
    Marine biology 111 (1991), S. 335-342 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Populations of the hard clam,Mercenaria mercenaria L., sampled from dissimilar, adjacent habitats (October and November 1987), were used to assess environmental effects on associations among multi-locus heterozygosity, growth, and survival. Individuals were collected from three widely separated localities along the east coast of North America with each consisting of a seagrass bed and an adjacent, unvegetated sandflat. Demographic differences between adjacent populations were attributed to habitat type. Samples from intertidal sandflats at two of the localities were dominated by younger individuals than those from seagrass beds. Differential growth between adjacent populations was detected at only one locality wherein seagrass individuals grew faster than those from the sandflat. Allelic frequencies revealed adjacent populations that were genetically homogeneous. Nearly all of the genetic variance (98%) was within populations, yet a small (1.7%), but significant, portion occurred between localities. Observed and expected heterozygosities revealed a deficiency of heterozygotes in all six samples. Inbreeding and small-scale population subdivision were discounted as causative factors because deficiencies were heterogeneous across loci. Multi-locus heterozygosity was not correlated with growth rate in samples from any locality. Using a consensus test, multilocus heterozygosity was positively associated with ageclass in sandflat, but not seagrass, samples. We suggest that heterozygosity-fitness trait associations in marine bivalves are more likely to occur in populations inhabiting more stressful, fluctuating environments
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01319404
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    Paper (German National Licenses)
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