全文获取类型
收费全文 | 5307篇 |
免费 | 440篇 |
国内免费 | 258篇 |
出版年
2023年 | 50篇 |
2022年 | 58篇 |
2021年 | 230篇 |
2020年 | 175篇 |
2019年 | 207篇 |
2018年 | 188篇 |
2017年 | 135篇 |
2016年 | 211篇 |
2015年 | 341篇 |
2014年 | 384篇 |
2013年 | 414篇 |
2012年 | 504篇 |
2011年 | 444篇 |
2010年 | 270篇 |
2009年 | 243篇 |
2008年 | 267篇 |
2007年 | 242篇 |
2006年 | 189篇 |
2005年 | 177篇 |
2004年 | 166篇 |
2003年 | 120篇 |
2002年 | 109篇 |
2001年 | 106篇 |
2000年 | 93篇 |
1999年 | 96篇 |
1998年 | 40篇 |
1997年 | 50篇 |
1996年 | 42篇 |
1995年 | 38篇 |
1994年 | 29篇 |
1993年 | 33篇 |
1992年 | 41篇 |
1991年 | 37篇 |
1990年 | 46篇 |
1989年 | 36篇 |
1988年 | 23篇 |
1987年 | 24篇 |
1986年 | 13篇 |
1985年 | 14篇 |
1984年 | 10篇 |
1983年 | 10篇 |
1982年 | 9篇 |
1981年 | 8篇 |
1979年 | 14篇 |
1978年 | 8篇 |
1975年 | 5篇 |
1973年 | 9篇 |
1972年 | 6篇 |
1971年 | 9篇 |
1968年 | 5篇 |
排序方式: 共有6005条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
G A Clawson J D Button Y C Liao E A Smuckler 《Biochemical and biophysical research communications》1986,136(3):989-994
We have detected an RNA species, containing sequences complementary to pre-albumin intron V in poly(A)+ RNA from rat liver cytoplasm (but not in nuclear RNA). Its relative abundance roughly parallels that of mature albumin mRNA, when comparing control with acute phase preparations. 相似文献
7.
John A. Schneider Rakhi Dandona Shravani Pasupneti Vemu Lakshmi Chuanhong Liao Vijay Yeldandi Kenneth H. Mayer 《PloS one》2010,5(7)
Studies of HIV prevention interventions such as pre-exposure prophylaxis (PREP) and circumcision in India are limited. The present study sought to investigate Indian truck-drivers initial commitment to PREP and circumcision utilizing the AIDS Risk Reduction Model. Ninety truck-drivers completed an in-depth qualitative interview and provided a blood sample for HIV and HSV-2 testing. Truck-drivers exhibited low levels of initial commitment towards PREP and even lower for circumcision. However, potential leverage points for increasing commitment were realized in fear of infecting family rather than self, self-perceptions of risk, and for PREP focusing on cultural beliefs towards medication and physicians. Cost was a major barrier to both HIV prevention interventions. Despite these barriers, our findings suggest that the ARRM may be useful in identifying several leverage points that may be used by peers, health care providers and public health field workers to enhance initial commitment to novel HIV prevention interventions in India. 相似文献
8.
Summary A laboratory experiment was conducted to study inhibition of soil urease activity by amido derivatives of phosphoric and thiophosphoric acids. Results showed that derivatives with higher amido substitutions have greater inhibitory effect on urea hydrolysis in the soils used in our study. Triamides of phosphoric and thiophosphoric acids were found to be very effective inhibitors of soil urease. These compounds seem to have potential as fertilizer amendments for inhibiting soil urease activity and for improving the efficiency of nitrogen use from urea. 相似文献
9.
Immunochemical studies on human monoclonal macroglobulins with specificities for 3,4-pyruvylated D-galactose and 4,6-pyruvylated D-glucose 总被引:4,自引:0,他引:4
A S Rao J Liao E A Kabat E F Osserman M Harboe W Nimmich 《The Journal of biological chemistry》1984,259(2):1018-1026
Four of six human monoclonal IgM proteins were found to react best with Klebsiella polysaccharides containing 3,4py beta DGal (pyruvic acetalated D-galactopyranose), one with Klebsiella polysaccharides with 4,6pyDGlc; the sixth is uncharacterized. The combining sites of two of these (IgMWEA and IgMNAE) were essentially indistinguishable by quantitative precipitin studies at varying pH and by quantitative precipitin inhibition assays, but the other two differed in specificity of their combining sites from these and from each other. These differences were detected by precipitin inhibition assays with 3,4py beta DGal-containing oligosaccharide alditols, the R and S isomers of methyl 4,6py alpha DGal, the R isomer of methyl 4,6py beta DGal, or the R and S isomers of methyl 4,6py alpha DGlc, and -beta DGlc. In all of these except the S isomer of methyl 4,6pyDGal and R isomer of methyl 4,6pyDGlc, the carboxyl group is axial to the plane of the acetal ring. Their specificity appears to be determined by the nonreducing ends of chains and is considered to be cavity-type. 相似文献
10.
Additive reagents have been investigated to improve the stability of methanolic Wright's stain. The addition of ammonium halides, monoalkyiamine hydrochlorides, dialkylamine hydrochlorides or trialkylamine hydrochlorides to methanolic Wright's stain was found to enhance the stability of stain components in methanol. No change in performance is observed with these additives present. Random precipitation in the stain solution was still observed with the addition of ammonium halides and monoalkyiamine hydrochlorides. No precipitation was found in stain solutions containing hydrochlorides of most dialkylamines and trialkylamines. Of the compounds evaluated, 0.6% diethylamine hydrochloride added to methanolic stain solutions produced the most desirable overall results. Mechanisms of stabilization and precipitation in these stain solutions are proposed, Essentially, separation of the thiazine-eosinate ion pair through interaction with an appropriate additive increases stain stability. The solubilities of thiazine-eosinate or additive cation-eosinate ion pairs in methanol determine the formation of precipitate in such stain solutions. 相似文献