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101.
J. P. Caen H. Michel G. Tobelem E. Bodevin S. Levy-Toledano 《Cellular and molecular life sciences : CMLS》1977,33(1):91-93
Summary An IgG antibody occurring in a recently transfused thrombasthenic patient inhibited all the ADP-mediated aggregations and platelet-platelet interaction (thrombus formation) on rabbit aorta subendothelium; another IgG antibody occurring in a multitransfused Bernard-Soulier patient inhibited ristocetin and bovine factor VIII mediated aggregation and platelet-subendothelium interaction. 相似文献
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105.
Summary Mycoside Cm, m.p. 198–200° []D = – 31° (CHCl3), a new peptido-glycolipid isolated fromMycobacterium marianum, has the approximate molecular formula C108H185N7O28 and gives on hydrolysis seven molecules ofd-amino acids (oned-phenylalanine, threed-allo-threonine, threed-alanine), three molecules of 6-deoxyhexoses (one 6-deoxy-talose of as yet undetermined configuration and two molecules of 3,4-di-O-methyl-l-rhamnose); the lipid moiety of mycoside Cm is a hydroxy-acid of approximate formula C50H96O3; three O-acetyl groups are also present. The preliminary formula (I) is proposed for mycoside Cm.
60ème communication sur les constitutants des Mycobactéries; 59ème comm. voir: ref. 7.
Ce travail a bénéficié d'une subvention de la Fondation Waksman pour le développement des Études microbiologiques en France, et d'une subvention du National Institute of Allergy and Infectious Diseases (Grant E 28 38). 相似文献
60ème communication sur les constitutants des Mycobactéries; 59ème comm. voir: ref. 7.
Ce travail a bénéficié d'une subvention de la Fondation Waksman pour le développement des Études microbiologiques en France, et d'une subvention du National Institute of Allergy and Infectious Diseases (Grant E 28 38). 相似文献
106.
Michel Wedel Frenkel ter Hofstede Jan-Benedict E.M. Steenkamp 《Journal of Classification》1998,15(2):225-244
We investigate the effects of a complex sampling design on the estimation of mixture models. An approximate or pseudo likelihood
approach is proposed to obtain consistent estimates of class-specific parameters when the sample arises from such a complex
design. The effects of ignoring the sample design are demonstrated empirically in the context of an international value segmentation
study in which a multinomial mixture model is applied to identify segment-level value rankings. The analysis reveals that
ignoring the sample design results in both an incorrect number of segments as identified by information criteria and biased
estimates of segment-level parameters. 相似文献
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108.
TGFB2 mutations cause familial thoracic aortic aneurysms and dissections associated with mild systemic features of Marfan syndrome 总被引:1,自引:0,他引:1
C Boileau DC Guo N Hanna ES Regalado D Detaint L Gong M Varret SK Prakash AH Li H d'Indy AC Braverman B Grandchamp CS Kwartler L Gouya RL Santos-Cortez M Abifadel SM Leal C Muti J Shendure MS Gross MJ Rieder A Vahanian DA Nickerson JB Michel;National Heart Lung Blood Institute 《Nature genetics》2012,44(8):916-921
A predisposition for thoracic aortic aneurysms leading to acute aortic dissections can be inherited in families in an autosomal dominant manner. Genome-wide linkage analysis of two large unrelated families with thoracic aortic disease followed by whole-exome sequencing of affected relatives identified causative mutations in TGFB2. These mutations-a frameshift mutation in exon 6 and a nonsense mutation in exon 4-segregated with disease with a combined logarithm of odds (LOD) score of 7.7. Sanger sequencing of 276 probands from families with inherited thoracic aortic disease identified 2 additional TGFB2 mutations. TGFB2 encodes transforming growth factor (TGF)-β2, and the mutations are predicted to cause haploinsufficiency for TGFB2; however, aortic tissue from cases paradoxically shows increased TGF-β2 expression and immunostaining. Thus, haploinsufficiency for TGFB2 predisposes to thoracic aortic disease, suggesting that the initial pathway driving disease is decreased cellular TGF-β2 levels leading to a secondary increase in TGF-β2 production in the diseased aorta. 相似文献
109.
High plant diversity is needed to maintain ecosystem services 总被引:3,自引:0,他引:3
Isbell F Calcagno V Hector A Connolly J Harpole WS Reich PB Scherer-Lorenzen M Schmid B Tilman D van Ruijven J Weigelt A Wilsey BJ Zavaleta ES Loreau M 《Nature》2011,477(7363):199-202
Biodiversity is rapidly declining worldwide, and there is consensus that this can decrease ecosystem functioning and services. It remains unclear, though, whether few or many of the species in an ecosystem are needed to sustain the provisioning of ecosystem services. It has been hypothesized that most species would promote ecosystem services if many times, places, functions and environmental changes were considered; however, no previous study has considered all of these factors together. Here we show that 84% of the 147 grassland plant species studied in 17 biodiversity experiments promoted ecosystem functioning at least once. Different species promoted ecosystem functioning during different years, at different places, for different functions and under different environmental change scenarios. Furthermore, the species needed to provide one function during multiple years were not the same as those needed to provide multiple functions within one year. Our results indicate that even more species will be needed to maintain ecosystem functioning and services than previously suggested by studies that have either (1) considered only the number of species needed to promote one function under one set of environmental conditions, or (2) separately considered the importance of biodiversity for providing ecosystem functioning across multiple years, places, functions or environmental change scenarios. Therefore, although species may appear functionally redundant when one function is considered under one set of environmental conditions, many species are needed to maintain multiple functions at multiple times and places in a changing world. 相似文献
110.
The integrity of the genome is frequently challenged by double-strand breaks in the DNA. Defects in the cellular response to double-strand breaks are a major cause of cancer and other age-related pathologies; therefore, much effort has been directed at understanding the enzymatic mechanisms involved in recognizing, signalling and repairing double-strand breaks. Recent work indicates that chromatin - the fibres into which DNA is packaged with a proteinaceous structural polymer - has an important role in initiating, propagating and terminating this cellular response to DNA damage. 相似文献