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   38932篇
  免费   3586篇
  国内免费   2657篇
耳鼻咽喉   198篇
儿科学   494篇
妇产科学   564篇
基础医学   4821篇
口腔科学   688篇
临床医学   4767篇
内科学   6353篇
皮肤病学   351篇
神经病学   2324篇
特种医学   1308篇
外国民族医学   23篇
外科学   4260篇
综合类   5816篇
现状与发展   12篇
一般理论   3篇
预防医学   2261篇
眼科学   972篇
药学   4038篇
  15篇
中国医学   1908篇
肿瘤学   3999篇
  2024年   105篇
  2023年   566篇
  2022年   1324篇
  2021年   1684篇
  2020年   1377篇
  2019年   1222篇
  2018年   1293篇
  2017年   1194篇
  2016年   1134篇
  2015年   1761篇
  2014年   2081篇
  2013年   1823篇
  2012年   2901篇
  2011年   3043篇
  2010年   1849篇
  2009年   1487篇
  2008年   2090篇
  2007年   2106篇
  2006年   1929篇
  2005年   2015篇
  2004年   1385篇
  2003年   1324篇
  2002年   1088篇
  2001年   882篇
  2000年   1018篇
  1999年   1073篇
  1998年   641篇
  1997年   690篇
  1996年   510篇
  1995年   482篇
  1994年   438篇
  1993年   299篇
  1992年   314篇
  1991年   325篇
  1990年   288篇
  1989年   250篇
  1988年   217篇
  1987年   212篇
  1986年   181篇
  1985年   136篇
  1984年   102篇
  1983年   78篇
  1982年   32篇
  1981年   43篇
  1980年   28篇
  1979年   32篇
  1978年   25篇
  1977年   19篇
  1976年   18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.
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   
102.
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   
103.
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   
104.
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   
105.
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   
106.
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   
107.
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   
108.
本文对近 10年收治 77例急性中毒的患儿进行了回顾性分析。观察到 :年幼小儿、农村小儿发病率较高 ,因误服药物、鼠药的食物致急性中毒的患儿较多 ,死亡病例均因就诊太晚。提示 :对急性中毒必须早诊断、早治疗。并提出减少小儿意外中毒的关键应从预防着手  相似文献   
109.
目的了解斜角肌间隙内臂丛下干与邻近组织结构及胸1神经干与第1肋的关系,为临床诊治臂丛下干卡压症提供解剖学依据。②方法在21具42侧成人标本上观测臂丛下干与邻近结构的位置关系。③结果在42侧标本的斜角肌间隙内,有33侧在前斜角肌的后内侧存在孤立的肌束,臂丛下干分别从其前下方(23侧)或后上方(10侧)通过;组成臂丛下干的胸1神经干在斜越第1肋前内侧面时部分穿行于骨纤维管内。④结论该肌束的压迫或拱抬均可成为臂丛下干受压的因素之一;组成臂丛下干的胸1神经干在越过第1肋时易受压迫。  相似文献   
110.
Plate fixation of fresh displaced midshaft clavicle fractures   总被引:2,自引:0,他引:2  
Shen WJ  Liu TJ  Shen YS 《Injury》1999,30(7):497-500
From 1992-1994, we operated on 251 fresh completely displaced mid-third clavicle fractures in adults; 232 were followed up. The fractures were plated with a Mizuho C-type plate or an AO/ASIF 3.5 mm reconstruction plate. Comminuted fragments were reduced and wired (133 cases). There were 150 men and 82 women; the median age was 37.3 years (range 18-79). The mean follow-up was 4.4 years (range 3.0-5.9). The mean time to radiographic union was 10 weeks. Seven patients (3%) developed nonunion. Healing with angulation occurred in 14 patients. Deep infection developed in one patient, and superficial infection in four cases; 21 patients reported soreness with changes in the weather and activity; 28 patients had residual skin numbness caudal to the incision. No patient had shoulder droop, and none had impairment of range of motion or shoulder strength. None developed new or late neurovascular impairment; 171 patients eventually had the hardware removed at an average 401 days post operatively. Overall, 94% were satisfied with the procedure. For completely displaced clavicle fractures in adults, plating is a reliable procedure.  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