全文获取类型
收费全文 | 1852篇 |
免费 | 137篇 |
国内免费 | 2篇 |
专业分类
1991篇 |
出版年
2022年 | 15篇 |
2021年 | 52篇 |
2020年 | 34篇 |
2019年 | 23篇 |
2018年 | 45篇 |
2017年 | 39篇 |
2016年 | 47篇 |
2015年 | 76篇 |
2014年 | 87篇 |
2013年 | 113篇 |
2012年 | 144篇 |
2011年 | 130篇 |
2010年 | 68篇 |
2009年 | 57篇 |
2008年 | 92篇 |
2007年 | 65篇 |
2006年 | 71篇 |
2005年 | 65篇 |
2004年 | 57篇 |
2003年 | 63篇 |
2002年 | 41篇 |
2001年 | 40篇 |
2000年 | 32篇 |
1999年 | 25篇 |
1998年 | 14篇 |
1997年 | 17篇 |
1995年 | 10篇 |
1994年 | 13篇 |
1992年 | 36篇 |
1991年 | 24篇 |
1990年 | 23篇 |
1989年 | 22篇 |
1988年 | 15篇 |
1987年 | 23篇 |
1986年 | 13篇 |
1985年 | 24篇 |
1984年 | 29篇 |
1983年 | 16篇 |
1982年 | 16篇 |
1981年 | 18篇 |
1979年 | 24篇 |
1978年 | 14篇 |
1977年 | 13篇 |
1975年 | 12篇 |
1974年 | 14篇 |
1973年 | 10篇 |
1969年 | 13篇 |
1968年 | 10篇 |
1967年 | 9篇 |
1966年 | 10篇 |
排序方式: 共有1991条查询结果,搜索用时 0 毫秒
21.
S. Sarkar 《Genetics》1991,127(2):257-261
22.
Intragenic Sequences Affect the Expression of the Gene Encoding Glial Fibrillary Acidic Protein 总被引:6,自引:1,他引:5
We show that the expression of the gene encoding glial fibrillary acidic protein (GFAP) gene is affected by at least three cis-acting elements. A positive regulatory element that is located between nucleotides -1,631 and -1,479 can confer cell type-specific expression on a heterologous gene. A second regulatory element is located between nucleotides -97 and -80. The third is a negative regulatory element that is located within the first intron of the gene. Deletion of this element activates GFAP expression in HeLa cells, and affects promoter function in glioma cells. 相似文献
23.
Effect of organophosphorus insecticide, phosphomidon (250 and 500 ppm) on human erythrocyte and plasma were studied in vitro to get insight into the cellular antioxidant defence mechanism and malondialdehyde formation. The antioxidant defence system of erythrocyte was altered as evident by depression of glutathione reductase, glucose 6 phosphate dehydrogenase, whereas the level of reduced glutathione, glutathione peroxidase, glutathione-S-transferase, superoxidedismutase and catalase were stimulated. In the case of plasma fraction, glutathione reductase, glutathione peroxidase, glutathione-s-transferase, glucose-6-phosphate dehydrogenase, superoxide dismutase and levels of reduced glutathione were significantly depressed and the malondialdehyde formation and catalase activity were elevated indicating the less adaptive response of plasma to protect it from oxidative damage. 相似文献
24.
Contamination of reagents used for PCR is a serious problem. We have recently reported the remarkable effectiveness of UV light in successful decontamination of PCR reagents when the reagents were contaminated with a 6-kb plasmid, followed by amplification of 750-bp segment from the insert. However, further investigation reveals that segment size, sequence and hydration can have a dramatic effect on the efficiency of UV inactivation. Despite some limitations, UV remains a highly effective means of decontamination. 相似文献
25.
Direct sequencing of the dopamine D2 receptor (DRD2) in schizophrenics reveals three polymorphisms but no structural change in the receptor. 总被引:6,自引:0,他引:6
G Sarkar S Kapelner D K Grandy M Marchionni O Civelli J Sobell L Heston S S Sommer 《Genomics》1991,11(1):8-14
The dopamine D2 receptor gene (gene symbol DRD2) is a candidate gene for schizophrenia because the potency of certain neuroleptics correlates with their affinity for this receptor. Seven regions of likely functional significance including the coding sequences and the splice junctions were fully sequenced in the dopamine D2 receptor of 14 schizophrenics (and partially in several others) meeting DSM-III-R diagnostic criteria and in four unaffected non-Caucasians (97 kb of total sequence). No structural changes were found, suggesting that alteration in the structure of the dopamine D2 receptor is not commonly involved in the etiology of schizophrenia. However, two common and one uncommon intragenic polymorphisms were found. At least one of the polymorphisms was informative for linkage in 70% of Caucasians and 78% of Koreans. 相似文献
26.
A high affinity Ca2(+)-ATPase on the surface membrane of Leishmania donovani promastigote 总被引:2,自引:0,他引:2
A Ca2(+)-dependent ATP-hydrolytic activity was detected in the crude membrane ghost of the promastigote or vector form of the protozoal parasite Leishmania donovani, the pathogen responsible for kala azar. The Ca2(+)-ATPase was purified to apparent homogeneity after solubilization with deoxycholate. The enzyme consists of two subunits of Mr = 51,000 and 57,000 and has an apparent molecular weight of 215,000 +/- 12,000. The enzyme activity is exclusively dependent on Ca2+, and the pure enzyme can hydrolyze 1.6 mumol of ATP/min/mg of protein. The apparent Km for Ca2+ is 35 nM, which is further reduced to 12 nM in the presence of heterologous calmodulin. The enzyme is sensitive to vanadate, but is insensitive to oligomycin and ouabain. The enzyme is strongly associated with the plasma membrane and has its catalytic site oriented toward the cytoplasmic face. The enzyme spans across the plasma membrane as surface labeling with radioiodine shows considerable radioactivity in the completely purified enzyme. The localization and orientation of this high affinity, calmodulin-sensitive Ca2(+)-ATPase suggest some role of this enzyme in Ca2+ movement in the life cycle of this protozoal parasite. 相似文献
27.
The microtubule associated proteins of goat brain were separated from tubulin on the basis of their thermostability and then
fractionated by chromatography on Sepharose 4B column. Analysis of the fractions by SDS-Polyacrylamide gel electrophoresis
and assay of their tubulin-assembly-promoting activity indicate that this activity resides primarily in the tauproteins (mol.
wt. 55,000–70,000) and a class of even lower molecular weight (25,000–35,000) proteins. Electrophoresis of the microtubule
associated protein fractions separated from tubulin by phosphocellulose chromatography are in agreement with the results obtained
from fractionation on Sepharose 4B columns. 相似文献
28.
Murine mammary tumor virus structural protein interactions: formation of oligomeric complexes with cleavable cross-linking agents 总被引:8,自引:5,他引:3 下载免费PDF全文
Murine mammary tumor virus protein interactions in the intact virion structure were studied with the use of the cleavable cross-linking reagents dithiobis(succinimidyl propionate) and methyl 4-mercaptobutyrimidate hydrochloride. Cross-linked oligomeric complexes of murine mammary tumor virus proteins were analyzed by two-dimensional gel electrophoresis. Among the complexes most consistently formed were a heterodimer of the two glycoproteins gp36 and gp52, the homodimer of gp36, and the homotrimer of gp52. A very prominent oligomer formed at higher concentrations of dithiobis(succinimidyl propionate) was a complex of about 230,000 molecular weight, made up of three molecules each of gp36 and gp52. A number of lines of evidence, including electron microscopic analysis, suggest that the 230,000-molecular-weight complex actually represents the murine mammary tumor virus spike structure. Of the murine mammary tumor virus core proteins, p14 forms homooligomers most readily. Upon cross-linking with methyl 4-mercaptobutyrimidate hydrochloride a small amount of what seems to be a heterodimer made up of the N-terminal gag protein p10 and the hydrophobic membrane glycoprotein gp36 can be observed. 相似文献
29.
Earlier experiments had shown that the degradation of newly synthesized RNA in permeable cells of Bacillus brevis is mediated primarily by a guanosine 3′,5′-monophosphate-sensitive 3′-exonuclease [N. Sarkar and H. Paulus (1975) J. Biol. Chem. 250, 684–690]. More recently, we found that a substantial fraction of pulse-labeled RNA in B. brevis is polyadenylylated [N. Sarkar, D. Langley, and H. Paulus (1978) Biochemistry 17, 3468–3474], and it was thus of interest to examine the effect of polyadenylylation on the susceptibility of RNA to degradation by the 3′-exonuclease. Purified 3′-exonuclease from B. brevis hydrolyzed the unadenylylated fraction of pulse-labeled RNA from B. brevis much more rapidly than poly(A)-containing RNA. Similar results were obtained with the pulse-labeled unadenylylated and polyadenylylated RNA fractions from Bacillus subtilis. Control experiments showed that the differential hydrolysis of the labeled RNA preparations by 3′-exonuclease was not due to the presence of inhibitors or activators. These results suggest that the stability of mRNA in Bacillus species may be regulated by polyadenylylation. 相似文献
30.
S L Marcus S W Smith J Racevskis N H Sarkar 《The Journal of biological chemistry》1979,254(11):4809-4813
Methods for the purification of both murine mammary tumor (type B) and murine leukemia (type C) oncornaviral phosphoproteins are described, in which chromatography on alkyl-agarose derivatives is used as the primary fractionation step. Gel filtration or ion exchange chromatography on phosphocellulose was the only subsequent step required for the purification of the type B and type C viral proteins, respectively. The two-step protocols also resulted in the co-purification of a low molecular weight core protein from each virus. Recoveries of the viral proteins purified by this method, based on per cent contribution of individual polypeptides to total virion proteins, were 70% or greater. Radioimmunocompetition analysis of the purified murine mammary tumor virus major core protein as well as analysis of the RNA binding properties of purified low molecular weight type C virus proteins suggests that neither antigenic reactivity nor specific RNA binding characteristics are altered by the purification protocols. The availability of these procedures should aid studies on the possible function and immunochemical properties of the native murine oncornaviral phosphoproteins and may also be extended to the purification of other oncornaviral proteins. 相似文献