全文获取类型
收费全文 | 3020篇 |
免费 | 134篇 |
国内免费 | 2篇 |
出版年
2021年 | 13篇 |
2019年 | 13篇 |
2018年 | 34篇 |
2017年 | 21篇 |
2016年 | 32篇 |
2015年 | 68篇 |
2014年 | 67篇 |
2013年 | 306篇 |
2012年 | 150篇 |
2011年 | 120篇 |
2010年 | 100篇 |
2009年 | 87篇 |
2008年 | 157篇 |
2007年 | 177篇 |
2006年 | 190篇 |
2005年 | 169篇 |
2004年 | 195篇 |
2003年 | 202篇 |
2002年 | 183篇 |
2001年 | 26篇 |
2000年 | 16篇 |
1999年 | 34篇 |
1998年 | 50篇 |
1997年 | 41篇 |
1996年 | 31篇 |
1995年 | 39篇 |
1994年 | 45篇 |
1993年 | 55篇 |
1992年 | 38篇 |
1991年 | 27篇 |
1990年 | 28篇 |
1989年 | 38篇 |
1988年 | 27篇 |
1987年 | 25篇 |
1986年 | 20篇 |
1985年 | 24篇 |
1984年 | 34篇 |
1983年 | 25篇 |
1982年 | 38篇 |
1981年 | 29篇 |
1980年 | 22篇 |
1979年 | 12篇 |
1978年 | 18篇 |
1977年 | 22篇 |
1976年 | 10篇 |
1975年 | 18篇 |
1974年 | 8篇 |
1973年 | 13篇 |
1972年 | 9篇 |
1970年 | 7篇 |
排序方式: 共有3156条查询结果,搜索用时 62 毫秒
91.
Jang-Su Park Katsuhiro Kano Yukio Morimoto Yoshiki Higuchi Noritake Yasuoka Mari Ogata Katsumi Niki Hideo Akutsu 《Journal of biomolecular NMR》1991,1(3):271-282
Summary The1H NMR signals of the heme methyl, propionate and related chemical groups of cytochromec
3 fromDesulfovibrio vulgaris Miyazaki F (D.v. MF) were site-specifically assigned by means of ID NOE, 2D DQFCOSY and 2D TOCSY spectra. They were consistent with the site-specific assignments of the hemes with the highest and second-lowest redox potentials reported by Fan et al. (Biochemistry,29 (1990) 2257–2263). The site-specific heme assignments were also supported by NOE between the methyl groups of these hemes and the side chain of Val18. All the results contradicted the heme assignments forD.v. MF cytochromec
3 made on the basis of electron spin resonance (Gayda et al. (1987)FEBS Lett.,217 57–61). Based on these assignments, the interaction of cytochromec
3 withD.v. MF ferredoxin I was investigated by NMR. The major interaction site of cytochromec
3 was identified as the heme with the highest redox potential, which is surrounded by the highest density of positive charges. The stoichiometry and association constant were two cytochromec
3 molecules per monomer of ferredoxin I and 108 M–2 (at 53 mM ionic strength and 25°C), respectively. 相似文献
92.
93.
Selecting pedigrees for linkage analysis of a quantitative trait: the expected number of informative meioses. 总被引:1,自引:1,他引:0 下载免费PDF全文
With evidence of segregation at a major locus for a quantitative trait having been found, a logical next step is to select a subset of the pedigrees to include in a linkage study to map the major locus. Ideally this subset should include much of the linkage information in the sample but include only a fraction of the pedigrees. We previously described a strategy for selecting pedigrees for linkage analysis of a quantitative trait on the basis of a pedigree likelihood-ratio statistic. For quantitative traits controlled by a major locus with a rare dominant allele, the likelihood-ratio strategy extracted nearly all the information for linkage while typically requiring marker data on only about one-third of the pedigrees. Here, we describe a new strategy to select pedigrees for linkage analysis on the basis of the expected number of potentially informative meioses in each pedigree. We demonstrate that this informative-meioses strategy provides an efficient and more general means to select pedigrees for a linkage study of a quantitative trait. 相似文献
94.
Hideo Mohri Akiko Fujiwara Masashi Daumae Ikuo Yasumasu 《Development, growth & differentiation》1990,32(4):375-381
In the spermatozoa of Asterias amurensis , patterns of changes in the respiratory rate and motility following dilution of dry sperm in sea water varied among batches and were classified into three types. The type I spermatozoa were immotile and exhibited quite low respiratory rate. Ethylenediamine tetraacetic acid made the type I spermatozoa motile and elevated their respiratory rate. The type II spermatozoa were also immotile and the respiratory rate remained quite low for about 5 min after the dilution. Thereafter, they spontaneously became motile and the respiratory rate increased. The type III spermatozoa became motile upon their dilution and exhibited high respiratory rate. Differences in the motility and respiratory rate of spermatozoa among batches probably result from degree of their maturation. In moving spermatozoa, the ADP and AMP levels increased at the expense of ATP. 2,4-Dinitrophenol elevated the respiratory rate only in immotile spermatozoa, which showed a high ATP level and quite low ADP level, but did not made them motile. Oligomycin inhibited the respiration of both motile and immotile spermatozoa. Probably, the respiratory rate is made low by a shortage of ADP in immotile spermatozoa and is enhanced by ADP production due to the initiation of their movement. 相似文献
95.
Summary The distribution of phenotypes controlled by three HLA-linked loci BF, C2, and GLO has been studied in Japanese patients with insulin-dependent diabetes mellitus (IDDM). A slight but significant higher incidence of a rare varian BF
*FT (=*
F075) in patients was confirmed in the combined data with our previous study (Tokunaga et al. 1981 b). No significant association of C2 and GLO alleles with IDDM was found. 相似文献
96.
Hideo Hamaguchi Michiko Yamada Masanao Shibasaki Ryozaburo Mukai Toshio Yabe Ikuko Kondo 《Human genetics》1982,62(2):142-147
Summary The 100 or so most intensely Coomassie blue-stained polypeptides from PHA-stimulated peripheral blood lymphocytes were analyzed by two-dimensional electrophoresis in combination with family and population studies. Besides polymorphic lymphocyte cytosol 64k polypeptide reported previously, genetic variants were frequently observed in three polypeptides with molecular weights of 100,000, 49,000, and 40,000. All of them occur in the cytosol. These variant polypeptides are charge variants, because they are separated in the isoelectric focusing dimension. It is indicated by family and population studies and cell distribution analysis that the polypeptide with a molecular weight of 100,000 shows a genetic polymorphism determined by two alleles at a new autosomal locus, as described in the following paper. Family and population studies also suggest that a genetic polymorphism defined by alleles at an autosomal locus is present in each of the polypeptides with molecular weights of 49,000 and 40,000. In contrast to the previous reports of the extremely restricted genetic variability of the 100 or so most abundant fibroblast polypeptides, the present data indicate that common genetic variants are present at least in four of the 100 or so most intensely Coomassie blue-stained lymphocyte polypeptides. The result also shows that careful side-by-side comparison of two-dimensional electrophoresis patterns among both parents and their children is an effective method to detect genetic variant polypeptides. 相似文献
97.
In Escherichia coli three major alkaline phosphatase isozymes are formed by molecular conversions depending on physiological conditions. A chromosomal gene, iap, is responsible for alkaline phosphatase isozyme conversion and is assumed to code for a proteolytic enzyme removing the arginine residue(s) from the N-terminal position of alkaline phosphatase subunits. A chromosomal fragment which complemented the Iap? phenotype was cloned into pBR322 by a shotgun method. Transducing phage λiap was constructed in vitro from the chromosomal fragment containing the iap gene and λtna DNA. The integration site of the phage on chromosome was identified as the iap locus by PI transduction, which meant that the cloned chromosomal DNA contained authentic iap gene.The restriction map of the hybrid plasmid was constructed. Based upon this information, several iap deletion plasmids as well as smaller iup+ plasmids were constructed. Analysis of the phenotypes conferred by these plasmids enabled us to locate iap gene within a 2-kb segment of the cloned DNA.The cells carrying the iap+ plasmid showed very efficient isozyme conversion even in medium containing arginine, an inhibitor for the isozyme conversion. This indicates overproduction of the iap gene product. 相似文献
98.
99.
100.
The mode of chromosome segregation in an asymmetrically dividing bacterium, Caulobacter crescentus, was studied by examining the fate of labeled DNA strands. Swarmer cells (one type of Caulobacter daughter cell), in which single strands of DNA had been labeled with [3H]thymidine during the previous round of chromosome replication, were grown synchronously in a non-radioactive medium for two generations. The distribution of radioactivity among the cells was visualized by autoradiography under a phase-contrast microscope. The labeled DNA strands in each cell were found to consist of two conserved units. From this, we propose a model in which the swarmer cell has two identical chromosomes, which are segregated into the progeny swarmer cell and the progeny stalked cell after chromosome replication. 相似文献