全文获取类型
收费全文 | 39118篇 |
免费 | 3598篇 |
国内免费 | 2791篇 |
专业分类
耳鼻咽喉 | 198篇 |
儿科学 | 512篇 |
妇产科学 | 562篇 |
基础医学 | 4836篇 |
口腔科学 | 690篇 |
临床医学 | 4853篇 |
内科学 | 6394篇 |
皮肤病学 | 356篇 |
神经病学 | 2326篇 |
特种医学 | 1384篇 |
外国民族医学 | 23篇 |
外科学 | 4271篇 |
综合类 | 5840篇 |
现状与发展 | 12篇 |
一般理论 | 3篇 |
预防医学 | 2264篇 |
眼科学 | 975篇 |
药学 | 4088篇 |
15篇 | |
中国医学 | 1902篇 |
肿瘤学 | 4003篇 |
出版年
2024年 | 105篇 |
2023年 | 568篇 |
2022年 | 1323篇 |
2021年 | 1690篇 |
2020年 | 1380篇 |
2019年 | 1226篇 |
2018年 | 1297篇 |
2017年 | 1198篇 |
2016年 | 1137篇 |
2015年 | 1764篇 |
2014年 | 2087篇 |
2013年 | 1832篇 |
2012年 | 2904篇 |
2011年 | 3047篇 |
2010年 | 1861篇 |
2009年 | 1495篇 |
2008年 | 2090篇 |
2007年 | 2183篇 |
2006年 | 1935篇 |
2005年 | 2027篇 |
2004年 | 1383篇 |
2003年 | 1322篇 |
2002年 | 1088篇 |
2001年 | 896篇 |
2000年 | 1018篇 |
1999年 | 1081篇 |
1998年 | 656篇 |
1997年 | 705篇 |
1996年 | 522篇 |
1995年 | 494篇 |
1994年 | 445篇 |
1993年 | 306篇 |
1992年 | 318篇 |
1991年 | 335篇 |
1990年 | 290篇 |
1989年 | 265篇 |
1988年 | 228篇 |
1987年 | 219篇 |
1986年 | 190篇 |
1985年 | 136篇 |
1984年 | 101篇 |
1983年 | 82篇 |
1982年 | 34篇 |
1981年 | 45篇 |
1980年 | 31篇 |
1979年 | 33篇 |
1978年 | 30篇 |
1977年 | 20篇 |
1976年 | 22篇 |
1973年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
103.
应用核酸分子杂交技术检测心肌炎组织中的肠道病毒RNA 总被引:4,自引:0,他引:4
用生物素标记pCBIII/35和pCBIII/51肠道病毒属特异性探针,对45心肌炎和心肮病尸检或心肌活检心脏组织进行原位杂交,结果显示:12例(26.6%)存在肠道病毒RNA。柯萨基B3病毒型特异性探针pCBIII/29进一步杂交表明,12例经证实存在肠道病毒RNA的心肌组织中5例(41.7%)出现阳性杂交信号。阳性杂信号主要位于单个或多个心肌细胞的胞浆和心肌的间质组织,偶见竽心肌小血管内皮细胞 相似文献
104.
目的 探讨降纤酶对青年人短暂性脑缺血(TIA)发作的治疗效果。方法 将72例患者随机分为两组。治疗组37例,给予降纤酶静滴至TIA发作终止或治疗达1周;对照组35例,给予阿司匹林、尼莫地平、低分子右旋糖酐、脉络宁治疗2周。两组于治疗前、后分别采静脉血检测血浆纤维蛋白原、红细胞压积、全血粘度和血浆粘度的变化。结果 总有效率治疗组为91.66%,对照组为77.14%,2组间有显著性差异(P〈0.01) 相似文献
105.
106.
Effects of reciprocal treatment with estrogen and estrogen plus parathyroid hormone on bone structure and strength in ovariectomized rats. 下载免费PDF全文
V Shen R Birchman R Xu M Otter D Wu R Lindsay D W Dempster 《The Journal of clinical investigation》1995,96(5):2331-2338
Intermittent administration of PTH has been found to be an effective anabolic agent in cancellous bone. We have reported previously that combined treatment with PTH and estrogen in estrogen-deficient rats was beneficial in correcting established osteopenia. To determine if the beneficial effects of PTH therapy can be preserved by estrogen alone and whether PTH therapy can be effective in treating osteopenic subjects stabilized with estrogen, we have undertaken a "crossover" study in the rat model of estrogen-deficiency induced osteopenia. Six-month-old female rats were ovariectomized and after 5 wk treated for 8 wk with vehicle, 30 micrograms/kg per day of rPTH(1-34) plus 15 micrograms/kg per day of 17 beta-estradiol or 17 beta-estradiol alone. One group from each treatment regimen was then sacrificed and for an additional 8 weeks the remaining rats were (a) maintained on their previous treatment; (b) "crossed over" to their reciprocal treatment; or (c) administered vehicle only. At the end of this second 8-wk treatment period all rats were sacrificed. Bone mineral density of the distal femur, histomorphometric measurements of the proximal tibia and mechanical testing of the distal femur and selected vertebral bodies were performed. Our results demonstrated that (a) the gains in bone mass, trabecular connectivity and mechanical strength induced by PTH can be maintained by estrogen alone, but are reversed when both agents are withdrawn; and (b) rats with established osteopenia, maintained on estrogen treatment alone, can derive the full beneficial effects from the addition of PTH to the treatment at a later date. These data indicate that combined and/or sequential use of antiresorptive and anabolic agents may be a promising approach to the treatment of osteoporosis. 相似文献
107.
At the turn of the last century, side by side with the infiltration of religious culture from Western countries, western medicine spread into Yantai. The religious force, headed by American Presbyterian Mission, carried out charitable activities in the process of preaching and laid down the foundation for western medicine rooted in Yantai by establishing schools, education and training followers. They cultivated local physicians by first setting up clinics which had later transformed into hospitals. These are their major measures for building bases for spreading Christianity by foreigners. The Temple Hill Hospital set up by the American physician Oscar F. Hills in Yantai was a successful example of mutual promotion of missionary and medical activities which pushed forward the spreading and development of western medicine in Yantai. 相似文献
108.
Several reports have noted cases of OCD which were unusual in showing an abrupt remission. We report longitudinal clinical observation of four cases of acute onset OCD without major depression through a variety of treatments. These patients had prominent feelings of shamefulness; compared to patients with typical OCD they were ill for months rather than years and were older. Two had previous episodes of psychiatric illness with full recovery. Full and persistent recovery occurred in response to lithium or an acute course of ECT but not to tricyclic or SSRI antidepressants. The generalizability of these observations is limited by its uncontrolled nature and the small numbers. The courses observed were consistent with episodic OCD as a possible expression of bipolar disorder and consideration of corresponding treatments. This perspective offers a new rationale for reported observations of remissions of acute onset OCD in response to lithium without lithium effectiveness for typical OCD. 相似文献
109.
110.
研究了零价铜为催化剂,以CCl4为引发剂,在2,2’-邻二吡啶(bpy)或1,10-邻二氮菲(phen)存在下的苯乙烯或甲基丙烯酸甲酯的“活性”/可控自由基聚合反应。研究结果表明:聚合过程中ln([M]o/[M])与反应时间成线性增长关系,同时生成的聚合物的数均分子量与单体转化率也成线性增长关系,聚合过程呈现“活性”特征。 相似文献