scholarly journals Accumulation of polychlorinated biphenyls by the infaunal brittle stars Amphiura filiformis and A. chiajei:effects of eutrophication and selective feeding

1999 ◽  
Vol 186 ◽  
pp. 173-185 ◽  
Author(s):  
JS Gunnarsson ◽  
M Sköld
Keyword(s):  
Polychlorinated Biphenyls ◽  
Selective Feeding ◽  
Brittle Stars ◽  
Amphiura Filiformis

Skeletal growth bands in brittle stars: microstructure and significance as age markers

1990 ◽  
Vol 70 (1) ◽  
pp. 209-224 ◽  
Author(s):  
J. D. Gage
Keyword(s):  
Growth Ring ◽  
Growth Curves ◽  
Skeletal Growth ◽  
Breaking Wave ◽  
Growth Strategies ◽  
Demographic Structure ◽  
Ne Atlantic ◽  
Active Growth ◽  
Brittle Stars ◽  
Amphiura Filiformis

Skeletal growth banding has been studied in the vertebral arm ossicles of the shallowwater brittle stars Ophiothrix fragilis, Amphiura filiformis, A. chiajei, Ophiura ophiura and O.albida collected from near Oban. Scanning electron microscopy of ossicle microstructure show the bands reflect differences in stereom porosity and surface relief on the surface of the wing-like fossae of the ossicle. The evidence supports the interpretation of the bands as annual growth markers, with coarse-pored stereom laid down during periods of active growth in summer/autumn whilst finer-pored stereom, that often forms ‘breaking wave’- like ridges, is formed during periods of slow or negligible skeletal growth during the rest of the year. Growth curves fitted to growth ring measurements indicate three contrasting growth strategies amongst the species examined. These data generally support recent interpretations of demographic structure reached from studies of size frequencies in samples collected from other areas in the NE Atlantic range of these species.

scholarly journals Brittle stars (Echinodermata: Ophiuroidea) in the German Bight (North Sea)—species diversity during the past 130 years

2006 ◽  
Vol 86 (5) ◽  
pp. 1187-1197 ◽  
Author(s):  
Karin Boos ◽  
Heinz-Dieter Franke
Keyword(s):  
Species Diversity ◽  
North Sea ◽  
German Bight ◽  
Common Species ◽  
Brittle Stars ◽  
The Past ◽  
Amphiura Filiformis ◽  
Amphipholis Squamata ◽  
Abundance And Distribution ◽  
Current Species

In this study, an overview of the current species composition of ophiuroids off Helgoland, German Bight (North Sea) is given. In addition, abundance and distribution of ophiuroids on different types of soft bottom sediments taken by van Veen grab samples around Helgoland were recorded. The literature was reviewed in order to outline the diversity of ophiuroid species over the past 130 years in the inner German Bight. In the historical literature, quantitative references often apply to verbal descriptions and thus make comparisons to modern data and assessment of possible changes in abundance rather subjective.In total, six ophiuroid species were identified off Helgoland: Acrocnida brachiata, Amphiura filiformis, Amphipholis squamata, Ophiothrix fragilis, Ophiura albida and Ophiura ophiura. The species found in this study had also been reported by previous investigators and are regarded as ‘common’ species in the German Bight. Occasional findings in this area refer to Amphiura chiajei, Ophiopholis aculeata, Ophiocten affinis and Ophiura sarsi, which are regarded here as ‘rare’ species. These findings, however, do not indicate sustainable changes in the species diversity over time.Apart from Acrocnida brachiata, a newcomer in the 1970s, findings of the common species mentioned above can be dated back to 1875. Therefore, a fairly stable composition of brittle stars is represented in the inner German Bight during the past 130 years.

Pesticide and non-dioxin-like polychlorinated biphenyls (NDL-PCBs) residues in foodstuffs from Ismailia city, Egypt

2008 ◽  
pp. 1-9 ◽  
Author(s):  
N. Loutfy ◽  
M. Fuerhacker ◽  
C. Lesueur ◽  
M. Gartner ◽  
M. Tawfic Ahmed ◽  
...  
Keyword(s):  
Polychlorinated Biphenyls

Fatty Liver and Impaired Hepatic Metabolism Alters the Congener-Specific Distribution of Polychlorinated Biphenyls (PCBs) in Mice with a Liver-Specific Deletion of Cytochrome P450 Reductase

2020 ◽  
Author(s):  
Xueshu Li ◽  
Chun-Yun Zhang ◽  
Hans-Joachim Lehmler
Keyword(s):  
Cytochrome P450 ◽  
Polychlorinated Biphenyls ◽  
Fatty Liver ◽  
Partition Coefficients ◽  
Hepatic Metabolism ◽  
Gas Chromatography Mass Spectrometry ◽  
Cytochrome P450 Reductase ◽  
P450 Reductase ◽  
Specific Distribution ◽  
Specific Deletion

Polychlorinated biphenyls (PCBs) are persistent organic pollutants that are linked to adverse health outcomes. PCB tissue levels are determinants of PCB toxicity; however, it is unclear how factors, such as an altered metabolism and/or a fatty liver, affect PCB distribution in vivo. We determined the congener-specific disposition of PCBs in mice with a liver specific deletion of cytochrome P450 reductase (KO), a model of fatty liver with impaired hepatic metabolism, and wildtype (WT) mice. Male and female KO and WT mice were exposed orally to Aroclor 1254, a technical PCB mixture. PCBs were quantified in adipose, blood, brain and liver tissues by gas chromatography-mass spectrometry. PCB profiles and levels in tissues were genotype and sex dependent. PCB levels were higher in the liver from KO compared to WT mice. PCB profiles showed clear differences between tissues from the same exposure group. While experimental tissue : blood partition coefficients in KO and WT mice did not follow the trends predicted using a composition-based model, the agreement between experimental and calculated partition coefficients was still reasonable. Thus, a fatty liver and/or an impaired hepatic metabolism alter the distribution of PCBs in mice and the magnitude of the partitioning of PCBs from blood into tissues can be approximated using composition-based models.<br>

Determination of Polychlorinated Biphenyls (PCB) in Insulating Fluids

2017 ◽  
Vol 83 (11) ◽  
pp. 15-20
Author(s):  
E. S. Brodskii ◽  
◽  
A. A. Shelepchikov ◽  
G. A. Kalinkevich ◽  
E. Ya. Mir-Kadyrova ◽  
...  
Keyword(s):  
Polychlorinated Biphenyls
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