全文获取类型
收费全文 | 3300篇 |
免费 | 289篇 |
国内免费 | 2篇 |
出版年
2022年 | 22篇 |
2021年 | 30篇 |
2020年 | 43篇 |
2019年 | 41篇 |
2018年 | 64篇 |
2017年 | 41篇 |
2016年 | 66篇 |
2015年 | 100篇 |
2014年 | 126篇 |
2013年 | 145篇 |
2012年 | 166篇 |
2011年 | 177篇 |
2010年 | 85篇 |
2009年 | 100篇 |
2008年 | 151篇 |
2007年 | 130篇 |
2006年 | 138篇 |
2005年 | 116篇 |
2004年 | 154篇 |
2003年 | 133篇 |
2002年 | 130篇 |
2001年 | 46篇 |
2000年 | 35篇 |
1999年 | 43篇 |
1998年 | 44篇 |
1997年 | 28篇 |
1996年 | 41篇 |
1995年 | 42篇 |
1994年 | 40篇 |
1993年 | 35篇 |
1992年 | 32篇 |
1991年 | 27篇 |
1990年 | 29篇 |
1989年 | 31篇 |
1988年 | 40篇 |
1987年 | 31篇 |
1986年 | 25篇 |
1985年 | 25篇 |
1984年 | 29篇 |
1983年 | 39篇 |
1982年 | 29篇 |
1981年 | 24篇 |
1980年 | 36篇 |
1979年 | 23篇 |
1978年 | 24篇 |
1975年 | 18篇 |
1974年 | 26篇 |
1973年 | 21篇 |
1969年 | 16篇 |
1954年 | 18篇 |
排序方式: 共有3591条查询结果,搜索用时 15 毫秒
101.
Hugh D. Campbell David A. Dionysius Dianne T. Keough Bruce E. Wilson John de Jersey Burt Zerner 《Biochemical and biophysical research communications》1978,85(2):615-622
The iron-containing violet acid phosphatases from beef spleen and pig allantoic fluid have been purified to homogeneity. Molecular weight determinations by zonal gel filtration, SDS-gel electrophoresis, and ultracentrifugation support values close to 40,000 for both enzymes, necessitating reappraisal of literature values. Similarly, the equivalent weight for iron is close to 20,000 for both enzymes, indicating the presence of two iron atoms per molecule of enzyme. The enzymes also have very similar ultraviolet and visible spectra, with λmax values close to 550 nm, and ?550 values(in terms of iron) of 2.04 × 103 and 2.00 × 103 for the beef spleen and pig allantoic fluid enzymes respectively. 相似文献
102.
The protective capacities of different sources of immune lymphocytes against Nippostrongylus brasiliensis infection were examined. Thoracic duct lymphocytes (TDL) drained from donors on the tenth day of a primary infection (Day 10 TDL) conferred greater protection against adult worms established by larval infection than either mesenteric lymph node cells (MLNC) or TDL drained from hyperimmune donors. Day 10 TDL also conferred a high degree of protection against intraduodenally implanted “normal” and “damaged” worms. These results suggest that the different susceptibilities of “normal” and “damaged” worms to adoptive protection is a quantitative rather than a qualitative phenomenon. The results also emphasise that kinetic and dose-response experiments are important in evaluating the protective capacities of transferred cells. 相似文献
103.
Hugh M. Miller S. Marvin Friedman David J. Litman Charles R. Cantor 《Molecular & general genetics : MGG》1976,144(3):273-280
Summary The surface topography of the intact 70S ribosome and free 30S and 50S subunits from Bacillus stearothermophilus strain 2184 was investigated by lactoperoxidase-catalyzed iodination. Two-dimensional polyacrylamide gel electrophoresis was employed to separate ribosomal proteins for analysis of their reactivity. Free 50S subunits incorporated about 18% more 125I than did 50S subunits derived from 70S ribosomes, whereas free 30S subunits and 30S subunits derived from 70S ribosomes incorporated similar amounts of 125I. Iodinated 70S ribosomes and subunits retained 62–78% of the protein synthesis activity of untreated particles and sedimentation profiles showed no gross conformational changes due to iodination. The proteins most reactive to enzymatic iodination were S4, S7, S10 and Sa of the small subunit and L2, L4, L5/9, L6 and L36 of the large subunit. Proteins S2, S3, S7, S13, Sa, L5/9, L10, L11 and L24/25 were labeled substantially more in the free subunits than in the 70S ribosome. Other proteins, including S5, S9, S12, S15/16, S18 and L36 were more extensively iodinated in the 70S ribosome than in the free subunits. The locations of tyrosine residues in some homologus ribosomal proteins from B. stearothermophilus and E. coli are compared. 相似文献
104.
Anionic peroxidase isoenzymes, separated on acrylamide gels, were examined in two flax genotrophs and in their reciprocal F2 hybrids. Isoenzyme 1 exhibited a significant difference in Rm between stem base and apex and there was a gradient of decreasing Rm and activity between base and apex. Isoenzyme 2 displayed only the activity gradient. The parents differed significantly in the Rm's and activities of isoenzymes 1 and 2, and the F2's showed complete dominance of the L parent for Rm, with activities being approximately intermediate. 相似文献
105.
106.
A generation matrix theory of full-sib mating is developed in which 13 mating "classes" are distinguished according to identity of genes in individuals mated and identity of genotypes as belonging to homozygous, parental, or offspring sets. The 13 times 13 matrix reveals some properties of the full-sib mating system not shown by previous work. The eigenvalues and a set of eigenvectors for the generation matrix, and the general solution for the frequencies of mating classes among descendants of an original mating of genotypes ab times cd, are given. The genotypic array of descendants in an arbitrary generation is also given. A new formula is derived for the coefficient of inbreeding in generation n + m in terms of coefficients of inbreeding in earlier generations. An algorithm is presented for calculating the probability of a given situation of identity of alleles carried by two individuals given only the indices of their own respective generations and the generation of their most recent common ancestor. The application of such probabilities to obtaining covariances between relatives in a full-sib mating system, under the assumptions of independence and non-interaction among loci, is illustrated. All results are shown to agree with previous work in special cases. All possible full sib, generation n - 1 parent-generation n + m offspring, and generation n uncle-generation n + m nephew covariances for 1 less than n + m less than or equal to 8 are obtained using the given algorithm. 相似文献
107.
A simple apparatus was designed for simultaneous general anesthesia of a number of small laboratory animals with spontaneous respiration. Anesthesia is consistent over many hr. The apparatus consists of an oxygen tank and vaporizer, a glass distribution bottle, and a non-return circuit of separate inspiratory and expiratory valves for each animal. The equipment is inexpensive to construct and can be rapidly adjusted for exact control of gas flow and anesthetic depth. 相似文献
108.
Hassan-Fahmi Aly Hans Geiger Ursula Schücker Hugh Waldrum George Vander Velde Tom J. Mabry 《Phytochemistry》1975,14(7):1613-1615
Ten glycosides of kaempferol and quercetin, including the hitherto unknown kaempferol and quercetin 3-rutinoside-7-rhamnosides, have been isolated from Equisetum silvaticum L. 相似文献
109.
Rashpal S. Dhillon Yiming Qin Paul R. van Ginkel Vivian X. Fu James M. Vann Alexis J. Lawton Cara L. Green Fúlvia B. ManchadoGobatto Claudio A. Gobatto Dudley W. Lamming Tomas A. Prolla John M. Denu 《Aging cell》2022,21(12)
Mitochondrial NAD+‐dependent protein deacetylase Sirtuin3 (SIRT3) has been proposed to mediate calorie restriction (CR)‐dependent metabolic regulation and lifespan extension. Here, we investigated the role of SIRT3 in CR‐mediated longevity, mitochondrial function, and aerobic fitness. We report that SIRT3 is required for whole‐body aerobic capacity but is dispensable for CR‐dependent lifespan extension. Under CR, loss of SIRT3 (Sirt3 −/− ) yielded a longer overall and maximum lifespan as compared to Sirt3 +/+ mice. This unexpected lifespan extension was associated with altered mitochondrial protein acetylation in oxidative metabolic pathways, reduced mitochondrial respiration, and reduced aerobic exercise capacity. Also, Sirt3 −/− CR mice exhibit lower spontaneous activity and a trend favoring fatty acid oxidation during the postprandial period. This study shows the uncoupling of lifespan and healthspan parameters (aerobic fitness and spontaneous activity) and provides new insights into SIRT3 function in CR adaptation, fuel utilization, and aging. 相似文献
110.
Hugh Kim Fumihiko Nakamura Claire Hong Christopher A. McCulloch 《Experimental cell research》2010,316(11):1829-1289
Cell adhesion and spreading on collagen, which are essential processes for development and wound healing in mammals, are mediated by β1 integrins and the actin and intermediate filament cytoskeletons. The mechanisms by which these separate cytoskeletal systems interact to regulate β1 integrins and cell spreading are poorly defined. We previously reported that the actin cross-linking protein filamin A binds the intermediate filament protein vimentin and that these two proteins co-regulate cell spreading. Here we used deletional mutants of filamin A to define filamin A-vimentin interactions and the subsequent phosphorylation and re-distribution of vimentin during cell spreading on collagen. Imaging of fixed and live cell preparations showed that phosphorylated vimentin is translocated to the cell membrane during spreading. Knockdown of filamin A inhibited cell spreading and the phosphorylation and re-distribution of vimentin. Knockdown of filamin A and/or vimentin reduced the cell surface expression and activation of β1 integrins, as indicated by immunoblotting of plasma membrane-associated proteins and shear force assays. In vitro pull-down assays using filamin A mutants showed that both vimentin and protein kinase C? bind to repeats 1-8 of filamin A. Reconstitution of filamin-A-deficient cells with full-length filamin A or filamin A repeats 1-8 restored cell spreading, vimentin phosphorylation, and the cell surface expression of β1 integrins. We conclude that the binding of filamin A to vimentin and protein kinase Cε is an essential regulatory step for the trafficking and activation of β1 integrins and cell spreading on collagen. 相似文献