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排序方式: 共有63条查询结果,搜索用时 312 毫秒
41.
Durand CM Betancur C Boeckers TM Bockmann J Chaste P Fauchereau F Nygren G Rastam M Gillberg IC Anckarsäter H Sponheim E Goubran-Botros H Delorme R Chabane N Mouren-Simeoni MC de Mas P Bieth E Rogé B Héron D Burglen L Gillberg C Leboyer M Bourgeron T 《Nature genetics》2007,39(1):25-27
SHANK3 (also known as ProSAP2) regulates the structural organization of dendritic spines and is a binding partner of neuroligins; genes encoding neuroligins are mutated in autism and Asperger syndrome. Here, we report that a mutation of a single copy of SHANK3 on chromosome 22q13 can result in language and/or social communication disorders. These mutations concern only a small number of individuals, but they shed light on one gene dosage-sensitive synaptic pathway that is involved in autism spectrum disorders. 相似文献
42.
Blain S Quéguiner B Armand L Belviso S Bombled B Bopp L Bowie A Brunet C Brussaard C Carlotti F Christaki U Corbière A Durand I Ebersbach F Fuda JL Garcia N Gerringa L Griffiths B Guigue C Guillerm C Jacquet S Jeandel C Laan P Lefèvre D Lo Monaco C Malits A Mosseri J Obernosterer I Park YH Picheral M Pondaven P Remenyi T Sandroni V Sarthou G Savoye N Scouarnec L Souhaut M Thuiller D Timmermans K Trull T Uitz J van Beek P Veldhuis M Vincent D Viollier E Vong L Wagener T 《Nature》2007,446(7139):1070-1074
The availability of iron limits primary productivity and the associated uptake of carbon over large areas of the ocean. Iron thus plays an important role in the carbon cycle, and changes in its supply to the surface ocean may have had a significant effect on atmospheric carbon dioxide concentrations over glacial-interglacial cycles. To date, the role of iron in carbon cycling has largely been assessed using short-term iron-addition experiments. It is difficult, however, to reliably assess the magnitude of carbon export to the ocean interior using such methods, and the short observational periods preclude extrapolation of the results to longer timescales. Here we report observations of a phytoplankton bloom induced by natural iron fertilization--an approach that offers the opportunity to overcome some of the limitations of short-term experiments. We found that a large phytoplankton bloom over the Kerguelen plateau in the Southern Ocean was sustained by the supply of iron and major nutrients to surface waters from iron-rich deep water below. The efficiency of fertilization, defined as the ratio of the carbon export to the amount of iron supplied, was at least ten times higher than previous estimates from short-term blooms induced by iron-addition experiments. This result sheds new light on the effect of long-term fertilization by iron and macronutrients on carbon sequestration, suggesting that changes in iron supply from below--as invoked in some palaeoclimatic and future climate change scenarios--may have a more significant effect on atmospheric carbon dioxide concentrations than previously thought. 相似文献
43.
In this paper we present a way of conducting design of experiments by Multivariate Additive Partial Least-Squares Splines
models, in short MAPLSS. In the framework of optimal experimental design based on small samples, in order to select the most
informative MAPLSS model, we process an adaptive incremental selection of observations by a particular bootstrap procedure.
Why MAPLSS models? Because they inherit the advantages of the PLS regression that permits to capture additively non-linear
main effects and relevant interactions in the difficult framework of small samples. The effectiveness of this approach is
illustrated on the reservoir simulator data used to forecast oil production. 相似文献
44.
Summary From the kinetic study of the effects of one single growth hormone (GH) injection on the phosphate metabolism, it appears that the influence of GH on the serum phosphate level is biphasic: a decrease is followed by an increase. Conversely GH leads to an early decrease of the urinary phosphate excretion. 相似文献
45.
G Durand M Guenounou J Feger J Agneray 《Comptes rendus des séances de l'Académie des sciences. Série D, Sciences naturelles》1977,285(16):1531-1534
Mouse spleen cells free of erythrocytes were suspended in PBS at a concentration of 2 X 10(7) cells/ml and mixed with an equal volume of sodium periodate in PBS for 10 min. at 4 degrees C to give a final concentration of periodate ranging from 10(-4) M to 5 X 10(-3) M. The cells were then washed and suspended (60 X 10(6) ml) in PBS containing 3H-labelled sodium borohydrate and incubated for 30 min, at 23 degrees C. Following this, the cells were washed and the pellets treated with H2SO4 0.1 N for 60 min. at 80 degrees C. Compounds liberated by such treatment, were identified by chromatography as derivates of sialic acid. The data provide direct evidence that the mitogenic effect of sodium periodate is associated to the oxidation of the sialic acid residues on the lymphocyte membrane. 相似文献
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47.
G Strecker B Fournet G Spik J Montreuil P Durand M Tondeur 《Comptes rendus des séances de l'Académie des sciences. Série D, Sciences naturelles》1977,284(1):85-88
Binding of corticosterone and aldosterone to plasma proteins of the edible Frog was studied by equilibrium dialysis technique. A high-affinity, transcortin-like, corticosterone binding system has been demonstrated, but, in vivo, the unbound fraction of this corticosteroid is higher that the bound one. Hypophysectomy and thyroidectomy do not change corticosteroids binding parameters which are modified by a variation of temperature. 相似文献
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