全文获取类型
收费全文 | 1558篇 |
免费 | 78篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 11篇 |
儿科学 | 135篇 |
妇产科学 | 76篇 |
基础医学 | 171篇 |
口腔科学 | 18篇 |
临床医学 | 118篇 |
内科学 | 217篇 |
皮肤病学 | 53篇 |
神经病学 | 175篇 |
特种医学 | 106篇 |
外科学 | 249篇 |
综合类 | 25篇 |
一般理论 | 1篇 |
预防医学 | 54篇 |
眼科学 | 64篇 |
药学 | 104篇 |
中国医学 | 1篇 |
肿瘤学 | 70篇 |
出版年
2021年 | 47篇 |
2020年 | 19篇 |
2019年 | 34篇 |
2018年 | 50篇 |
2017年 | 23篇 |
2016年 | 28篇 |
2015年 | 37篇 |
2014年 | 42篇 |
2013年 | 48篇 |
2012年 | 80篇 |
2011年 | 77篇 |
2010年 | 49篇 |
2009年 | 35篇 |
2008年 | 65篇 |
2007年 | 58篇 |
2006年 | 54篇 |
2005年 | 44篇 |
2004年 | 58篇 |
2003年 | 52篇 |
2002年 | 51篇 |
2001年 | 40篇 |
2000年 | 39篇 |
1999年 | 35篇 |
1997年 | 21篇 |
1996年 | 15篇 |
1995年 | 20篇 |
1994年 | 22篇 |
1993年 | 13篇 |
1992年 | 16篇 |
1991年 | 32篇 |
1990年 | 23篇 |
1989年 | 17篇 |
1988年 | 24篇 |
1987年 | 26篇 |
1986年 | 25篇 |
1985年 | 22篇 |
1984年 | 17篇 |
1983年 | 18篇 |
1982年 | 14篇 |
1981年 | 19篇 |
1980年 | 14篇 |
1979年 | 20篇 |
1978年 | 16篇 |
1977年 | 15篇 |
1974年 | 14篇 |
1973年 | 13篇 |
1972年 | 13篇 |
1968年 | 18篇 |
1967年 | 16篇 |
1966年 | 16篇 |
排序方式: 共有1648条查询结果,搜索用时 330 毫秒
11.
12.
13.
Immunocytochemical localization of inhibin was carried out in paraffin embedded tissue sections of the control and antiprogestin (ZK 98.299)-treated bonnet monkey endometrium using polyclonal antibodies generated against human seminal plasma inhibin (10.5 kDa). The study shows that administration of low doses (5 mg/ week) of antiprogestin results in an increase in the expression of inhibin by the endometrium. Treatment with higher doses (20 mg/week) caused a decrease in the expression. Since treatment with higher doses also caused atropic changes in the endometrium, the decrease in inhibin could be the result of morphological damage to the endometrium rather than the effects of antiprogestin on the expression of inhibin. The potential involvement of endometrial inhibin in the process of nidation is speculated. 相似文献
14.
This report deals with the effect of purified HSPI (10.7 kDa single chain prostatic peptide of 94 amino acids) on PHA-stimulated proliferation of peripheral blood mononuclear cells (PBMNC). HSPI was found to inhibit the incorporation of 3H-thymidine by PHA-stimulated PBMNC in a dose-dependent manner, albeit with the requisite of pretreatment of cells with HSPI. A maximum inhibition was observed on pretreatment for 30 min. These studies thus indicate that HSPI may be interfering with the very early events of PHA-induced signal transduction process in PBMNC. 相似文献
15.
Sheth BR Shimojo S 《Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale》2002,143(2):181-190
Pointing movements made with a hidden cursor from the center of gaze to a stationary, visible target overshot the actual target location. The systematic error decreased when the final cursor location from the previous trial was shown, which likely led to the creation of an internal sensorimotor model of movement. However, the putative model had a short memory, and could not substitute for on-line visuomotor feedback on subsequent trials. Contrary to common belief, the effect of a lack of visuomotor feedback was seen even in the early acceleration stage of the movement trajectory. Unchecked in the absence of visual monitoring, the acceleration stage of the movement lasted longer, as was evidenced by the significantly larger value of the peak cursor speed. Moreover, the speed peaked much later in the course of the movement. Speed declined more rapidly thereafter. Consequently, the delayed deceleration stage lasted far less than the acceleration stage. In the absence of visual feedback, the shift rightward in time of the peak speed position (PSP) in relation to total movement duration and other changes in the trajectory imply that visual feedback must play a significant role in determining when acceleration ceases (d V/d t=0), and argue against the traditional notion that visuomotor feedback is unavailable until the later stages of movement. Moreover, our data suggest that non-visual modalities, e.g., proprioception, may be too slow to make up for the absence of vision. 相似文献
16.
17.
The HLA-A, -B, -C and DR loci antigen frequencies were determined, respectively, on 1145, 558 and 352 healthy nonrelated Saudi family members. B21, CW4, CW7, and Dr7 showed the highest gene frequencies, of 14.6%, 28.3%, 7.4% and 19.5%, when compared to other populations. Haplotypes A2-B5, A32-B51, A26-B8, A2-B21, A28-B35, Aw19-B21 and B21-CW4 showed the highest frequencies when compared to other populations. Gene frequencies of 14.6% and 20.2% for B21 and Aw19 antigens, respectively, are highest among Middle East populations. Gene frequencies for A1 (10.5%), A2 (24.9%), A3 (8.9%), A9 (16.7%) and A28 (7.9%) are similar to the 10.1%, 24.9%, 8.3%, 16.8% and 7.7%, respectively, reported for the Turkish population. Also, gene frequencies for B5 (18.5%), B21 (14.6%) and B35 (10.2%) are very close to 17.1%, 14.0% and 10.2%, respectively, reported in the Yemenite population. The above results suggest some influence of other populations on the 'pure' Arab population. 相似文献
18.
19.