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排序方式: 共有63条查询结果,搜索用时 15 毫秒
31.
Ultrastructure of ALS transformed lymphocytes 总被引:1,自引:0,他引:1
D Fries P A Bryon N Brunat-Blanc J Brochier M Carraz J Traeger 《Experimental cell research》1969,54(1):23-28
32.
J L McGregor L McGregor A S Bauer B Catimel J Brochier M Dechavanne K J Clemetson 《European journal of biochemistry》1986,159(3):443-449
The effect of two monoclonal antibodies P2 (LyP 2) or P4 (LyP 4), specific for the platelet membrane glycoprotein IIb/IIIa complex, on binding of 125I-labelled fibrinogen or 125I-labelled fibronectin to thrombin-stimulated platelets was studied. These monoclonal antibodies are directed against different determinants on the IIb-IIIa complex and react only with the complex and not with the individual glycoproteins. Fibrinogen binding to thrombin-stimulated platelets was significantly inhibited by P2 but not by P4. Fibronectin binding to thrombin-stimulated platelets was significantly inhibited by P4 but only poorly by P2. These results indicate the presence of specific regions on the glycoprotein IIb-IIIa complex which act as binding sites for fibrinogen or fibronectin. Other authors [Haverstick et al. (1985) Blood 66, 946-952; Ginsberg et al. (1985) J. Biol. Chem. 260, 4133-4138] have shown that a tetrapeptide, Arg-Gly-Asp-Ser, inhibited the binding of fibrinogen, fibronectin, and von Willebrand factor (vWf) to stimulated platelets and that fibrinogen competes with vWf and fibronectin for binding. These findings, together with previous studies, therefore indicate the presence of specific regions as well as a common region in the binding sites for fibrinogen and fibronectin on the IIb-IIIa complex. 相似文献
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Guy Brochier Tadeusz Gulik-Krzywicki Bernard Lesbats Jean-Claude Dedieu Maurice Israel 《Biology of the cell / under the auspices of the European Cell Biology Organization》1992,74(2):225-230
Proteoliposomes obtained from the mediatophore, a purified Torpedo electric organ nerve terminals protein, and endogenous lipids were used for a study of calcium-induced release of acetylcholine and freeze-fracture electron microscopy. Large intramembrane particles were induced by the influx of calcium into proteoliposomes, as previously observed for synaptosomes or stimulated electric organ nerve terminals. The involvement of mediatophore in a calcium dependent acetylcholine translocation seems therefore to be related to the occurrence of a category of intramembrane particles in the course of the release process. 相似文献
35.
Nguyen Trong Hieu Timothée Brochier Nguyen-Huu Tri Pierre Auger Patrice Brehmer 《Acta biotheoretica》2014,62(3):339-353
We consider a fishery model with two sites: (1) a marine protected area (MPA) where fishing is prohibited and (2) an area where the fish population is harvested. We assume that fish can migrate from MPA to fishing area at a very fast time scale and fish spatial organisation can change from small to large clusters of school at a fast time scale. The growth of the fish population and the catch are assumed to occur at a slow time scale. The complete model is a system of five ordinary differential equations with three time scales. We take advantage of the time scales using aggregation of variables methods to derive a reduced model governing the total fish density and fishing effort at the slow time scale. We analyze this aggregated model and show that under some conditions, there exists an equilibrium corresponding to a sustainable fishery. Our results suggest that in small pelagic fisheries the yield is maximum for a fish population distributed among both small and large clusters of school. 相似文献
36.
Melina Fischer Kerstin Wernike Conrad M. Freuling Thomas Müller Orhan Aylan Bernard Brochier Florence Cliquet Sonia Vázquez-Morón Peter Hostnik Anita Huovilainen Mats Isaksson Engbert A. Kooi Jean Mooney Mihai Turcitu Thomas B. Rasmussen Sandra Revilla-Fernández Marcin Smreczak Anthony R. Fooks Denise A. Marston Martin Beer Bernd Hoffmann 《PloS one》2013,8(3)
37.
Linda Dainese Marie-Lorraine Monin Sophie Demeret Guy Brochier Roseline Froissart Anne Spraul Raphael Schiffmann Danielle Seilhean Fanny Mochel 《Gene》2013
Background
A 45-year old woman of Cambodian ethnic background presented with fatal respiratory failure due to a severe diaphragmatic dysfunction. Two years before, she had developed early onset of urinary symptoms.Methods and results
Neuroimaging showed atrophy of the spine and medulla as well as a leukodystrophy affecting both supra- and infra-tentorial regions. At autopsy, polyglucosan bodies (PB) were seen in several peripheral tissues, including the diaphragm, and nervous tissues such as peripheral nerves, cerebral white matter, basal ganglia, hippocampus, brainstem and cerebellum. Immunohistochemistry and electron microscopy of the brain revealed an exclusive astrocytic localization of the PB. The diagnosis of adult polyglucosan body disease (APBD) was confirmed by enzymatic and molecular studies.Conclusion
Storage of abnormal glycogen in astrocytes is sufficient to cause the leukodystrophy of APBD. Since brain glycogen is almost exclusively metabolized in astrocytes, this observation sheds light on the pathophysiology of APBD. In addition, this is the first report of an APBD patient presenting with a subacute diaphragmatic failure. 相似文献38.
Timothée Brochier Vincent Echevin Jorge Tam Alexis Chaigneau Katerina Goubanova Arnaud Bertrand 《Global Change Biology》2013,19(6):1841-1853
The Humboldt Current System (HCS) sustains the world′s largest small pelagic fishery. While a cooling of this system has been observed during recent decades, there is debate about the potential impacts of rising atmospheric CO2 concentrations on upwelling dynamics and productivity. Recent studies suggest that under increased atmospheric CO2 scenarios the oceanic stratification may strongly increase and upwelling‐favorable winds may remain nearly constant off Peru and increase off Chile. Here we investigate the impact of such climatic conditions on egg and larval dispersal phases, a key stage of small pelagic fish reproduction. We used larval retention rate in a predefined nursery area to provide a proxy for the recruitment level. Numerical experiments are based on hydrodynamics downscaled to the HCS from global simulations forced by pre‐industrial (PI), 2 × CO2 and 4 × CO2 scenarios. A biogeochemical model is applied to the PI and 4 × CO2 scenarios to define a time‐variable nursery area where larval survival is optimum. We test two distinct values of the oxycline depth that limits larval vertical distribution: One corresponding to the present‐day situation and the other corresponding to a shallower oxycline potentially produced by climate change. It appeared that larval retention over the continental shelf increases with enhanced stratification due to regional warming. However, this increase in retention is largely compensated for by a decrease of the nursery area and the shoaling of the oxycline. The underlying dynamics are explained by a combination of stratification effects and mesoscale activity changes. Our results therefore show that future climate change may significantly reduce fish capacity in the HCS with strong ecological, economic and social consequences. 相似文献
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Interleukin-6 (IL-6) is used as a growth factor by various tumor cells. It binds to a gp80 specific receptor (IL-6R) and then to a gp130 transducing chain. Both receptor chains are released as soluble functional proteins which circulate in biological fluids. To study the physiological role of these soluble receptors, both proteins were purified from human plasma and the kinetic constants of equilibria between IL-6 and its natural soluble IL-6R (sIL-6R) and gp130 receptor (sgp130) were measured using surface plasmon resonance analysis. Unexpectedly, natural sIL-6R and natural sgp130 were found to interact (Kd = 2.8 nM) in the absence of IL-6. No interaction was seen between the recombinant soluble receptors or between either natural soluble receptor and its recombinant partner. This binary complex was not due to copurification of IL-6 and was detected in human plasma of healthy donors. It results from either direct interaction between the two natural soluble receptors or indirect binding mediated by a yet unidentified copurified plasma molecule playing the role of an IL-6 antagonist. Once formed, the binary complex was found to be unable to bind IL-6. Soluble gp130 had already been shown to inhibit IL-6 signaling by inactivating the IL-6/IL-6R complex. In addition we show that, in the absence of IL-6, circulating natural sgp130 is able to inhibit directly the circulating sIL-6R that is a strong synergic molecule of IL-6 signaling. 相似文献