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81.
P. Nielsen R. Fischer H. C. Heinrich A. A. Pfau 《Cellular and molecular life sciences : CMLS》1988,44(6):502-504
Summary The efficacy of different hexacyanoferrates(II) in preventing the enteral absorption of134Cs was studied in piglets. As compared to the controls, oral application of134Cs together with KFe[Fe(CN)6], NH4Fe[Fe(CN)6], or Fe4[Fe(CN)6]3 resulted in a strong reduction of the134Cs-uptake by more than 97%. The decrease in enteral absorption depends on the dose of administered hexacyanoferrate(II), whereas differences between the compounds under study were small. The biological half-life of134Cs in non-hexacyanoferrate(II) treated piglets was 21.6±3.3 days (mean±SD). 相似文献
82.
Abbot P Abe J Alcock J Alizon S Alpedrinha JA Andersson M Andre JB van Baalen M Balloux F Balshine S Barton N Beukeboom LW Biernaskie JM Bilde T Borgia G Breed M Brown S Bshary R Buckling A Burley NT Burton-Chellew MN Cant MA Chapuisat M Charnov EL Clutton-Brock T Cockburn A Cole BJ Colegrave N Cosmides L Couzin ID Coyne JA Creel S Crespi B Curry RL Dall SR Day T Dickinson JL Dugatkin LA El Mouden C Emlen ST Evans J Ferriere R Field J Foitzik S Foster K Foster WA Fox CW Gadau J Gandon S 《Nature》2011,471(7339):E1-4; author reply E9-10
Arising from M. A. Nowak, C. E. Tarnita & E. O. Wilson 466, 1057-1062 (2010); Nowak et al. reply. Nowak et al. argue that inclusive fitness theory has been of little value in explaining the natural world, and that it has led to negligible progress in explaining the evolution of eusociality. However, we believe that their arguments are based upon a misunderstanding of evolutionary theory and a misrepresentation of the empirical literature. We will focus our comments on three general issues. 相似文献
83.
Upwelling-driven nearshore hypoxia signals ecosystem and oceanographic changes in the northeast Pacific 总被引:2,自引:0,他引:2
Grantham BA Chan F Nielsen KJ Fox DS Barth JA Huyer A Lubchenco J Menge BA 《Nature》2004,429(6993):749-754
Seasonal development of dissolved-oxygen deficits (hypoxia) represents an acute system-level perturbation to ecological dynamics and fishery sustainability in coastal ecosystems around the globe. Whereas anthropogenic nutrient loading has increased the frequency and severity of hypoxia in estuaries and semi-enclosed seas, the occurrence of hypoxia in open-coast upwelling systems reflects ocean conditions that control the delivery of oxygen-poor and nutrient-rich deep water onto continental shelves. Upwelling systems support a large proportion of the world's fisheries, therefore understanding the links between changes in ocean climate, upwelling-driven hypoxia and ecological perturbations is critical. Here we report on the unprecedented development of severe inner-shelf (<70 m) hypoxia and resultant mass die-offs of fish and invertebrates within the California Current System. In 2002, cross-shelf transects revealed the development of abnormally low dissolved-oxygen levels as a response to anomalously strong flow of subarctic water into the California Current System. Our findings highlight the sensitivity of inner-shelf ecosystems to variation in ocean conditions, and the potential impacts of climate change on marine communities. 相似文献
84.
85.
Allgén L. -G. Jönsson B. Nauckhoff B. Andersen M. -L. Huus I. Møller Nielsen I. 《Cellular and molecular life sciences : CMLS》1960,16(7):325-325
Zusammenfassung Die Ausscheidung des neuen Neuroleptikums, Chlorprothixen, bei Menschen und Ratten wurde in Urin, Galle und Faeces untersucht und als einziges Abbauprodukt Chlorprothixen-Sulfoxyd gefunden. Ausscheidungsprodukte in % der verabreichten Dosis: Beim Menschen (orale Verabreichung) im Urin: 5–29% Sulfoxyd, Faeces: 0–41% unveränderter Stoff + Sulfoxyd. Bei der Ratte (orale oder parenterale Verabreichung) im Urin: bis zu 5% Sulfoxyd, Faeces: 1–7% Sulfoxyd, keine unveränderte Substanz, Galle: bis zu 24% Sulfoxyd. 相似文献
86.
Lesion of the bone matrix in vitamin D-resistant rickets 总被引:2,自引:0,他引:2
87.
Summary The insecticide 4-methylthio-1,2-dithiolane, named charatoxin, blocks the frog muscular twitches elicited through the neuromuscular junction. The activity level and the course of inhibition is comparable to that of 4-dimethyl-amino-1,2-dithiolane, nereistoxin.The authors are grateful to Dr N. Jacobsen, Cheminova A/S for synthesizing the toxins and the 2 analogues. 相似文献
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89.