全文获取类型
收费全文 | 9025篇 |
免费 | 727篇 |
国内免费 | 68篇 |
专业分类
耳鼻咽喉 | 195篇 |
儿科学 | 293篇 |
妇产科学 | 150篇 |
基础医学 | 1057篇 |
口腔科学 | 166篇 |
临床医学 | 1192篇 |
内科学 | 1750篇 |
皮肤病学 | 68篇 |
神经病学 | 563篇 |
特种医学 | 361篇 |
外国民族医学 | 2篇 |
外科学 | 1225篇 |
综合类 | 228篇 |
一般理论 | 5篇 |
预防医学 | 1012篇 |
眼科学 | 304篇 |
药学 | 807篇 |
中国医学 | 7篇 |
肿瘤学 | 435篇 |
出版年
2022年 | 66篇 |
2021年 | 156篇 |
2020年 | 91篇 |
2019年 | 177篇 |
2018年 | 163篇 |
2017年 | 124篇 |
2016年 | 143篇 |
2015年 | 166篇 |
2014年 | 237篇 |
2013年 | 308篇 |
2012年 | 460篇 |
2011年 | 457篇 |
2010年 | 286篇 |
2009年 | 215篇 |
2008年 | 356篇 |
2007年 | 424篇 |
2006年 | 398篇 |
2005年 | 355篇 |
2004年 | 311篇 |
2003年 | 310篇 |
2002年 | 292篇 |
2001年 | 295篇 |
2000年 | 292篇 |
1999年 | 257篇 |
1998年 | 125篇 |
1997年 | 124篇 |
1996年 | 119篇 |
1995年 | 100篇 |
1994年 | 89篇 |
1993年 | 85篇 |
1992年 | 216篇 |
1991年 | 252篇 |
1990年 | 194篇 |
1989年 | 163篇 |
1988年 | 144篇 |
1987年 | 149篇 |
1986年 | 161篇 |
1985年 | 168篇 |
1984年 | 116篇 |
1983年 | 100篇 |
1981年 | 66篇 |
1980年 | 60篇 |
1979年 | 103篇 |
1978年 | 70篇 |
1976年 | 70篇 |
1974年 | 65篇 |
1973年 | 68篇 |
1972年 | 73篇 |
1971年 | 62篇 |
1970年 | 59篇 |
排序方式: 共有9820条查询结果,搜索用时 265 毫秒
1.
2.
3.
Rift Valley fever (RVF) virus infection, dissemination, and transmission rates were determined for Aedes fowleri, Aedes mcintoshi and Culex pipiens 7 or 10 days after sequentially feeding to repletion on RVF virus immune hamsters and RVF viremic hamsters, or after feeding on a mixture of RVF virus immune sheep serum and RVF viremic hamster blood through a pledget. No significant differences in infection or dissemination rates were detected among Ae. fowleri and Cx. pipiens feeding to repletion on immune hamsters before or after feeding to repletion on a viremic hamster. Similarly, no significant differences in infection, dissemination, or transmission rates were observed among Ae. fowleri and Cx. pipiens feeding to repletion on immune hamsters or nonimmune (control) hamsters 0 or 24 hr after inoculation with RVF virus. Infection rates were significantly higher for Ae. fowleri (56/66, 85%) and Cx. pipiens (123/148, 83%) fed only on viremic hamsters than for those interrupted to complete feeding on an immune hamster (Ae. fowleri [24/49, 59%], Cx. pipiens [66/131, 50%]) or a nonimmune hamster (Ae. fowleri [32/51, 63%], Cx. pipiens [69/127, 54%]). However, no significant differences were detected in infection, dissemination, or transmission rates among Ae. fowleri, Ae. mcintoshi or Cx. pipiens fed on a viremic hamster and interrupted to complete feeding on an immune vs. a nonimmune hamster. Results from interrupted feeding experiments were significantly different from pledget feeding experiments.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
4.
5.
6.
7.
8.
This short report describes the successful healing of an infected axillo-bifemoral graft by the insertion of Gentamicin beads, this technique cannot be recommended for all infected grafts the majority of which will have to be removed and replaced. 相似文献
9.
Inter-study differences: How should they influence the interpretation and analysis of results? 总被引:2,自引:0,他引:2
K R Bailey 《Statistics in medicine》1987,6(3):351-360
In determining the role inter-study variation should play in an overview analysis, it is important to consider three factors: which question one is trying to answer; the degree of similarity or dissimilarity of design, and the degree to which heterogeneity of outcomes can be explained. Three questions one might be interested in are: whether treatment can be effective in some circumstances; whether treatment is effective on average, and whether treatment was effective on average in the trials at hand. Under the assumption of no qualitative interaction, the answers to these questions coincide. The O-E analysis most directly answers the third question. Other analyses are suggested when the first question is of interest, using the aspirin post-MI studies as an example. 相似文献
10.
ZQ Yin MD SG Crewther PhD B Pirie BSc DP Crewther PhD 《Clinical & experimental ophthalmology》1997,25(4):107-109
Purpose: It was investigated whether alterations in neuronal structure and function occasioned by strabismic amblyopia also may be reflected in alterations in the expression on Y type neurons of a Cat-301 antibody sensitive antigen in the lateral geniculate nucleus (LGN) and cortex of our cat model of strabismic amblyopia. Methods/Results: The percentage of positively labelled cells was reduced in LGN laminae that received input from the deviated eye in strabismic amblyopic cats compared with normal cats. In the strabismic cortex, the density of immunopositive neurons was significantly reduced compared with normal, the effect being most pronounced in layer IV Conclusions: Despite previous physiological recordings indicating a decrease in X-cell associated acuity in strabismic amblyopia, the present findings imply that the changes in the early visual experience occasioned by strabismus also produce specific molecular changes in theY neuronal class. 相似文献