排序方式: 共有44条查询结果,搜索用时 15 毫秒
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R. J. Capon K. Elsbury M. S. Butler C. C. Lu J. N. A. Hooper J. A. P. Rostas K. J. O'Brien L. -M. Mudge A. T. R. Sim 《Cellular and molecular life sciences : CMLS》1993,49(3):263-264
The Antarctic marine spongeTedania charcoti has been shown to contain extraordinarily high natural concentrations of cadmium and zinc, which have in turn been correlated to the ability of the crude ethanol extract to modulate protein phosphorylation in chicken forebrain and to inhibit the growth of several test bacteria. 相似文献
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As ubiquitous sensor networks (USN) technologies and its middleware are still at its early stages, the system of the USN relies on the middleware and applications. The past sensor networks are assumed to be designed for specific applications, having data communication protocols tightly coupled to applications. To avoid these problems, several kinds of USN middleware have been researched and developed. However, most middleware of USN are still restricted by its own infrastructure so far. This paper proposes appropriate 3 tier Smart Middleware System (3SMS) for USN. 相似文献
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T. A. Geissman K. Y. Sim J. Murdoch 《Cellular and molecular life sciences : CMLS》1967,23(10):793-794
Zusammenfassung Das massive organische Mineral Curtisite (Idrialite) besteht aus Picen, Chrysen und, wie aus den Massenspektren der rohen Proben zu entnehmen ist, deren Methyl-homologen.
Contribution from the Departments of Chemistry (No. 2078) and Geology, University of California, Los Angeles. 相似文献
Contribution from the Departments of Chemistry (No. 2078) and Geology, University of California, Los Angeles. 相似文献
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C. H. Sim 《Journal of forecasting》1994,13(4):369-381
We shall first review some non-normal stationary first-order autoregressive models. The models are constructed with a given marginal distribution (logistic, hyperbolic secant, exponential, Laplace, or gamma) and the requirement that the bivariate joint distribution of the generated process must be sufficiently simple so that the parameter estimation and forecasting problems of the models can be addressed. A model-building approach that consists of model identification, estimation, diagnostic checking, and forecasting is then discussed for this class of models. 相似文献
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Fulchignoni M Ferri F Angrilli F Ball AJ Bar-Nun A Barucci MA Bettanini C Bianchini G Borucki W Colombatti G Coradini M Coustenis A Debei S Falkner P Fanti G Flamini E Gaborit V Grard R Hamelin M Harri AM Hathi B Jernej I Leese MR Lehto A Lion Stoppato PF López-Moreno JJ Mäkinen T McDonnell JA McKay CP Molina-Cuberos G Neubauer FM Pirronello V Rodrigo R Saggin B Schwingenschuh K Seiff A Simões F Svedhem H Tokano T Towner MC Trautner R Withers P Zarnecki JC 《Nature》2005,438(7069):785-791
On the basis of previous ground-based and fly-by information, we knew that Titan's atmosphere was mainly nitrogen, with some methane, but its temperature and pressure profiles were poorly constrained because of uncertainties in the detailed composition. The extent of atmospheric electricity ('lightning') was also hitherto unknown. Here we report the temperature and density profiles, as determined by the Huygens Atmospheric Structure Instrument (HASI), from an altitude of 1,400 km down to the surface. In the upper part of the atmosphere, the temperature and density were both higher than expected. There is a lower ionospheric layer between 140 km and 40 km, with electrical conductivity peaking near 60 km. We may also have seen the signature of lightning. At the surface, the temperature was 93.65 +/- 0.25 K, and the pressure was 1,467 +/- 1 hPa. 相似文献
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An IgG autoantibody which inactivates C1-inhibitor 总被引:9,自引:0,他引:9
Antibodies are considered to play a specific pathogenic role in certain disease states such as myasthenia gravis, Graves' disease and autoimmune haemolytic anaemia. Autoantibodies which interfere with the function of enzyme cascade systems have also been described in diseases such as acquired haemophilia (anti-factor VIII antibodies) and glomerulonephritis (C3 nephritic factor). The identification of these autoantibodies is crucial to an understanding of the aetiology of such diseases and is also of importance in revealing the inter-relationships of the immune system with other biological pathways. This is the first report of an immunoglobulin G (IgG) autoantibody reactive with C1-inhibitor (C1-Inh), a pivotal inhibitor of the inflammatory response which is known to inactivate proteins of the complement, kinin, fibrinolytic and 'contact phase' systems. This autoantibody was isolated from a patient with a novel variant of acquired angioedema and C1-Inh dysfunction. This finding highlights the involvement of the immune system in the pathogenesis of disorders characterized by the presence of dysfunctional inflammatory response proteins. 相似文献
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This study offers a detailed analysis of an episode of the popularization of astronomy which took place in Portugal, a peripheral country of Europe, and occurring in the early twentieth century. The episode was driven by the 28 May 1900 total solar eclipse which was seen on the Iberian Peninsula (Portugal and Spain). Instead of focusing on one of the ends of the popularization process, we analyze the circulation of knowledge among scientists and the public, contrast the aims of the various expeditions, professional and amateur, which took place on Portuguese soil, analyze their repercussions in the Portuguese astronomical landscape, and the different ways used by the Portuguese political elite and astronomical community to successfully appropriate this astronomical event to serve their varied agendas, political, social and scientific. In this episode of public enthusiasm for science, a central figure emerged in the network of the official commission, professional and amateur communities and the ‘general public’: Frederico Tomás Oom (1864–1930), an astronomer of the Lisbon Astronomical Observatory. This paper aims to illustrate the different layers of the circulation process, and at proving that the popularization of science was not a unidirectional process from scientists to lay people nor did it serve only a particular agenda, be it political, social or scientific. 相似文献
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Omar Torres-Carvajal Fernando P. Ayala-Varela Simón E. Lobos Steven Poe Andrea E. Narváez 《Journal of Natural History》2018,52(13-16):1067-1089
ABSTRACTWe describe two new species of Anolis lizard that are sympatric on the Amazonian slopes of the Andes of southern Ecuador at elevations between 1440 and 1970 m. The new species may be distinguished from other Anolis by external anatomy, mitochondrial divergence and dewlap colour. We estimate the phylogenetic positions of the new species using Bayesian analysis of DNA sequence data including all species of Dactyloa-clade Anolis for which DNA data are available. Anolis hyacintogularis sp. nov. is sister to Anolis calimae, whereas Anolis lososi sp. nov. is sister to Anolis williamsmittermeierorum, herein reported for Ecuador for the first time. Individuals of both new species were collected within a protected area in southern Ecuador, Podocarpus National Park, which suggests that at least some populations of these species are well protected.www.zoobank.org/urn:lsid:zoobank.org:pub:E55FA804-E3FD-4412-8FEB-5234E29E272D 相似文献
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Nocentini S Reginensi D Garcia S Carulla P Moreno-Flores MT Wandosell F Trepat X Bribian A del Río JA 《Cellular and molecular life sciences : CMLS》2012,69(10):1689-1703
Newly generated olfactory receptor axons grow from the peripheral to the central nervous system aided by olfactory ensheathing
cells (OECs). Thus, OEC transplantation has emerged as a promising therapy for spinal cord injuries and for other neural diseases.
However, these cells do not present a uniform population, but instead a functionally heterogeneous population that exhibits
a variety of responses including adhesion, repulsion, and crossover during cell–cell and cell–matrix interactions. Some studies
report that the migratory properties of OECs are compromised by inhibitory molecules and potentiated by chemical gradients.
Here, we demonstrated that rodent OECs express all the components of the Nogo receptor complex and that their migration is
blocked by myelin. Next, we used cell tracking and traction force microscopy to analyze OEC migration and its mechanical properties
over myelin. Our data relate the decrease of traction force of OEC with lower migratory capacity over myelin, which correlates
with changes in the F-actin cytoskeleton and focal adhesion distribution. Lastly, OEC traction force and migratory capacity
is enhanced after cell incubation with the Nogo receptor inhibitor NEP1-40. 相似文献