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排序方式: 共有543条查询结果,搜索用时 15 毫秒
61.
Semmlow John L.; Gauthier Gabriel M.; Vercher Jean-Louis 《Canadian Metallurgical Quarterly》1989,15(2):249
A number of processes have been identified that adaptively modify oculomotor control components. The adaptive process studied here can be reliably produced over a short period of time by a visual stimulus that forces postsaccadic error. This short-term adaptive process, usually termed parametric adaptation, consists of a change in response amplitude that develops progressively over 50 to 100 training stimuli. Both increases and decreases in response amplitude can be evoked by an appropriately timed and directed movement of the stimulus target, which forces postsaccadic error. Results show that a single type of training stimulus can influence movements over a broad spatial region, provided these movements are in the same direction as the training stimulus. Experiments that map the range of modification suggest that the increasing adaptive modification is achieved through an overall reduction of gain. Training stimuli that attempt to evoke both increases and decreases in the same region show a net modification equivalent to the algebraic addition of individual adaptive processes. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
62.
Cairns Robert B.; Cairns Beverley D.; Neckerman Holly J.; Gest Scott D.; Gariépy Jean-Louis 《Canadian Metallurgical Quarterly》1988,24(6):815
Studied social networks and aggressive behavior in school in 2 cohorts of boys and girls in the 4th and 7th grades (N?=?695). Measures of social networks yielded convergent findings. Highly aggressive subjects (both boys and girls) did not differ from matched control subjects in terms of social cluster membership or in being isolated or rejected within the social network. Peer cluster analysis and reciprocal "best friend" selections indicated that aggressive subjects tended to affiliate with aggressive peers. Even though highly aggressive children and adolescents were less popular than control subjects in the social network at large, they were equally often identified as being nuclear members of social clusters. Aggressive subjects did not differ from matched control subjects in the number of times they were named by peers as "best friend," nor did the two groups differ in the probability of having friendship choices reciprocated by peers. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
63.
Jacques Darriet Jean-Louis Soubeyroux Hidekazu Touhara Alain Tressaud Paul Hagenmuller 《Materials Research Bulletin》1982,17(3):315-324
The nature of the magnetic interactions in RuF5 and OsF5 has been investigated using neutron diffraction and magnetic measurements under high applied fields. RuF5 and OsF5 are magnetically ordered at respectively TN = 5 and 6 K. The magnetic structures have been determined. A model based on isolated tetranuclear clusters M4F20 (M = Ru or Os) has been applied to explain the magnetic behavior above the Néel temperature. The intracluster exchange interactions are antiferromagnetic. The fitting of the magnetization data leads to an exchange constant of for RuF5, in good agreement with that calculated from the thermal variation of the magnetic susceptibility. 相似文献
64.
65.
Alvaro?Fernández Cesar?Scorzza Alfredo?Usubillaga Jean-Louis?SalagerEmail author 《Journal of surfactants and detergents》2005,8(2):187-191
New extended anionic surfactants with a carboxylate or sulfate polar head were synthesized from polypropoxylated alcohols,
and their structures were confirmed by 1H and 13C nuclear magnetic resonance analysis. The extended surfactant critical micelle concentration was found to decrease with the
length of the polypropylene glycol spacer. Surfactants containing a diethylene glycol link to the head group exhibited a higher
critical micelle concentration than did their nondiethoxylated homologs. 相似文献
66.
Thierry Pagnier Mireille Fouletier Jean-Louis Souquet 《Materials Research Bulletin》1983,18(5):609-613
A semi-conducting phosphovanadate glass was tested as a possible material for positive electrode in solid state batteries.O.c. voltage with alkali metal (3.6 V/Li and 3.4 V/Na) is higher than for crystallized vanadium oxides and chemical intercalation of sodium or lithium is obtained using halogenated salts dissolved in organic solvents. 相似文献
67.
Laetitia Théron Pascal TournayreNathalie Kondjoyan Saïd AbouelkaramVéronique Santé-Lhoutellier Jean-Louis Berdagué 《Meat science》2010
The aim of this work was to reliably identify odour-active compounds in dry-cured ham using powerful analysis methods for the volatile fraction. For this purpose, dynamic headspace gas chromatography combined with eight-way olfactometry using a panel of eight sniffers was used. One- and two-dimensional gas chromatography coupled with mass spectrometry and (or) olfactometry were also used. More than 600 compounds from the volatile fraction of dry-cured ham were identified and their biochemical origins are discussed. They covered a wide diversity of structures and chemical functions. Only 29 of them proved odour-active. Comparison of the results of GC–O analysis with those obtained by orthonasal sniffing of the dry-cured ham helped to gain a better understanding of how these substances contributed to the overall aroma of the product. Thus, “Fruity–Floral”, “Green–Vegetable” or “Plastic–Chemical” odours intensively perceived by GC–O have been poorly perceived by orthonasal sniffing. By contrast, “Animal–Meat products” or “Butter–Lactic–Cheesy” odours have been much better perceived by orthonasal sniffing. These results indicate that to understand the interactions between odour-active compounds, experimental doping with carefully selected odour-active compounds will be necessary. 相似文献
68.
Auffan M Decome L Rose J Orsiere T De Meo M Briois V Chaneac C Olivi L Berge-Lefranc JL Botta A Wiesner MR Bottero JY 《Environmental science & technology》2006,40(14):4367-4373
Although the current production of oxide nanoparticles may be modest, the wide range of proposed applications and forecasted growth in production has raised questions about the potential impact of these nanoparticles on the environment and human health. Iron oxide nanoparticles have been proposed for an increasing number of biomedical applications although in vitro toxicity depending on the particles coating has been evidenced. The aim of this study was to examine the potential in vitro cyto- and genotoxicity on human dermal fibroblasts of DMSA-coated maghemite nanoparticles (NmDMSA) as a function of well-defined physicochemical states. Well-stabilized NmDMSA produced weak cytotoxic and no genotoxic effects. This is attributed in part to the DMSA coating, which serves as a barrier for a direct contact between nano-oxide and fibroblasts, inhibiting a potential toxic effect. 相似文献
69.
70.
Firmesse O Alvaro E Mogenet A Bresson JL Lemée R Le Ruyet P Bonhomme C Lambert D Andrieux C Doré J Corthier G Furet JP Rigottier-Gois L 《International journal of food microbiology》2008,125(2):176-181
The objective of this study was to determine i) if Camembert cheese micro-organisms could be detected in fecal samples after regular consumption by human subjects and ii) the consequence of this consumption on global metabolic activities of the host colonic microbiota. An open human protocol was designed where 12 healthy volunteers were included: a 2-week period of fermented products exclusion followed by a 4-weeks Camembert ingestion period where 2x40 g/day of Camembert cheese was consumed. Stools were collected from the volunteers before consumption, twice during the ingestion period (2nd and 4th week) and once after a wash out period of 2 weeks. During the consumption of Camembert cheese, high levels of Lactococcus lactis and Leuconostoc mesenteroides were measured in fecal samples using real-time quantitative PCR, reaching median values of 8.2 and 7.5 Log(10) genome equivalents/g of stool. For Ln. mesenteroides, persistence was observed 15 days after the end of Camembert consumption. The survival of Geotrichum candidum was also assessed and the fecal concentration reached a median level of 7.1 Log(10) CFU/g in stools. Except a decreasing trend of the nitrate reductase activity, no significant modification was shown in the metabolic activities during this study. 相似文献