首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   39118篇
  免费   3598篇
  国内免费   2791篇
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
  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  
沈茜  汪美先 《中华病理学杂志》1994,23(2):79-81,T014
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.
采用抽样研究方法,对438名不同专业、不同层次的大学生进行了医德认知调查,以了解大学生对医德基本知识掌握的情况,结果表明,大学生对开设医学伦理学课必要性认识均率为62.9%,课外经常阅读医德书籍均率为22.75%,对中外基德发展史各朝代典型的人物及代表作了解的均率为31.1%,文中对调查结果进行了分析。  相似文献   
106.
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.
肿瘤标志物DR-70在恶性肿瘤诊断中的应用   总被引:1,自引:0,他引:1  
林丁  沈萍  杨静梅 《重庆医学》1999,28(5):332-333
目的:评价肿瘤标志物DR-70在恶性肿瘤中的诊断应用。方法:应用美国AMDL公司的DR-70^TM ELISA试剂盒,测定对20例正常人和59例恶性肿瘤病人血清DR-70含量。结果:各种恶性肿瘤DR-70的阳性率为66.7 ̄100%,均较正常对照组有非常显著性差异(P〈0.001)。结论:血清DR-70是诊断恶性肿瘤有价值的标志物。  相似文献   
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   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号