959 resultados para Sei Whale
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Capitulares grab. xil.
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Variations in regulatory regions of developmental control genes have been implicated in the divergence of axial morphologies. To find potentially significant changes in cis-regulatory regions, we compared nucleotide sequences and activities of mammalian Hoxc8 early enhancers. The nucleotide sequence of the early enhancer region is extremely conserved among mammalian clades, with five previously described cis-acting elements, A–E, being invariant. However, a 4-bp deletion within element C of the Hoxc8 early enhancer sequence is observed in baleen whales. When assayed in transgenic mouse embryos, a baleen whale enhancer (unlike other mammalian enhancers) directs expression of the reporter gene to more posterior regions of the neural tube but fails to direct expression to posterior mesoderm. We suggest that regulation of Hoxc8 in baleen whales differs from other mammalian species and may be associated with variation in axial morphology.
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v.58:no.1(1970)
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REACH is a very demanding system for any business either large or small, yet right from the start one of the more serious concerns was whether and how SMEs could cope with the Regulation. After all, some 27,600 companies in EU chemistry are SMEs (95% of all firms). Seven years down the line, many of these fears are materialising. Assuming no significant changes are introduced to REACH, this paper suggests the following recommendations: Above all, we strongly encourage SMEs to start early and develop a strategy for REACH compliance well before 2018. Address the potential competition law implications of current SIEF arrangements, e.g. through a Guidance document from DG Competition by 2014 (in time for 2018) Facilitate the exchange of information along the value chain by adopting pragmatic approach to the content and format of Safety Data Sheets. More can be done on the IT front as well, for instance by developing tools that generate compliant Safety Data Sheets. Improve the communication of REACH and its intended goals, that is, the health and environmental benefits, to the wider public. SMEs regret the unawareness of the public in the light of the enormous efforts they have to undertake. In the event of a later review of REACH, the logic should be risk-based rather than hazard-based.
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Studies on the fate of organohalogen contaminants (OHCs) in wild top predator mammals in the Arctic have often been a challenge due to important knowledge deficiencies in the life history of the sampled animals. The present study investigated the influence of age, dietary and trans-generational factors on the fate of major lipophilic chlorinated and brominated OHCs in adipose tissue of a potential surrogate captive species for the polar bear (Ursus maritimus), the sledge dog (Canis familiaris) in West Greenland. Adult female sledge dogs (P) and their sexually-mature (F1) and/or pre-weaning pups (F1-MLK) were divided into an exposed group (EXP) fed blubber from a Greenland minke whale (Balaenoptera acutorostrata) and a control group (CON) given commercially available pork fat. Large dietary treatment-related differences in summed and individual congener/compound adipose tissue concentrations of polybrominated diphenyl ethers (PBDEs), hexachlorobenzene (HCB), chlordanes (CHLs) and polychlorinated biphenyls (PCBs) were found between the EXP and CON groups for all the sledge dog cohorts. However, among the F1-MLK, F1 and P dogs in both of the EXP and CON groups, little or no difference existed in PBDE, HCB, CHL and PCB concentrations, suggesting higher state of equilibrium in adipose tissue concentrations from a very early stage of life. In contrast, the distribution pattern (proportions to the summed concentrations) of OHC classes, and the major congeners/ compounds constituting those classes, varied on a dietary group- and/or cohort-dependent manner. The present captive sledge dog study demonstrated the importance of the confounding effects of diet composition, mother-pup association (maternal transfer), reproductive status (nursing), and to a lesser extent age in the fate of OHCs in adipose tissue of a large top carnivore mammal.
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Alto part-book: p. 21 missing.