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   126597篇
  免费   10618篇
  国内免费   6159篇
耳鼻咽喉   1339篇
儿科学   2292篇
妇产科学   2823篇
基础医学   15206篇
口腔科学   2329篇
临床医学   16589篇
内科学   20861篇
皮肤病学   1185篇
神经病学   7462篇
特种医学   4404篇
外国民族医学   43篇
外科学   14072篇
综合类   15316篇
现状与发展   23篇
一般理论   31篇
预防医学   8420篇
眼科学   3717篇
药学   12182篇
  56篇
中国医学   4840篇
肿瘤学   10184篇
  2024年   290篇
  2023年   1615篇
  2022年   3939篇
  2021年   5322篇
  2020年   3729篇
  2019年   3602篇
  2018年   3987篇
  2017年   3250篇
  2016年   3195篇
  2015年   4840篇
  2014年   6193篇
  2013年   5813篇
  2012年   8704篇
  2011年   9479篇
  2010年   5641篇
  2009年   4473篇
  2008年   6389篇
  2007年   6704篇
  2006年   6536篇
  2005年   6747篇
  2004年   4901篇
  2003年   4395篇
  2002年   3972篇
  2001年   2982篇
  2000年   3222篇
  1999年   3211篇
  1998年   1816篇
  1997年   1709篇
  1996年   1496篇
  1995年   1367篇
  1994年   1173篇
  1993年   829篇
  1992年   1396篇
  1991年   1221篇
  1990年   1074篇
  1989年   980篇
  1988年   920篇
  1987年   847篇
  1986年   745篇
  1985年   638篇
  1984年   449篇
  1983年   352篇
  1982年   239篇
  1981年   232篇
  1980年   218篇
  1979年   296篇
  1978年   196篇
  1977年   196篇
  1974年   179篇
  1973年   174篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
按心理护理程序实施步骤综述了采供血机构开展无偿献血心理护理的现状,提出应尽快拓宽采供血机构医护人员心理学知识,提高心理护理技能水平,构建科学合理的采供血机构心理护理模式.  相似文献   
102.
103.
104.
105.
OBJECTIVE: To examine the distribution of rat facial motoneurons contributing different branches under normal situation and when nerve reinnervation occurred following facial nerve axotomy. METHODS: The normal distribution of motoneurons innervated both buccal and marginal mandibular branches and its reorganization after facial nerve reinnervation was observed using retrograde labeling with fluorescein. RESULTS: Under normal situation, the motoneurons contributing buccall and marginal mandibular branches were primarily distributed in the intermedial and lateral subnucleus in facial nucleus and almost completely overlapped. The two types labeled neurons organized closely, but there were no double-labeled neurons. Although the motoneurons contributing buccall and marginal mandibular branches were primarily overlapped 4 month post-anastomosis, the number of the labeled neurons obviously decreased and the organization got more scattered. There were 10% of buccall branches, 5% of marginal mandibular motoneurons in the dorsal subnuleus, 1% of buccall and 4% of marginal mandibular in dorsal ventral and medial subnucleus. The distribution pattern of the motoneurons 6 month post-anastomosis was similar to that of 4 month post-anastomosis, but the number of the labeled neurons increased, and there were 1%-2% double-labeled neurons. CONCLUSION: The distribution pattern of motoneurons innervated both buccal and marginal mandibular branches indicates that it should exist wide-spread communicating branches, and its reorganization after facial nerve reinnervation suggests that misdirected regeneration occurs among motoneurons innervating different branches.  相似文献   
106.
OBJECTIVE: To quantify accurately the rate of adverse reactions after the preschool (fifth) dose of adsorbed diphtheria toxoid-pertussis vaccine-tetanus toxoid (DPT) vaccine and to test the hypothesis that large local reactions are attributable to the diphtheria toxoid. DESIGN: Double-blind randomized controlled trial. SETTING: Suburban community public health unit. PARTICIPANTS: Healthy children 4 to 5 years of age with a history of having received four doses of adsorbed DPT vaccine. INTERVENTIONS: Subjects were given either the standard DPT vaccine (with 25 Lf units of diphtheria toxoid) or a modified DPT vaccine (with 10 Lf units of diphtheria toxoid). They were assessed 24 hours later by a nurse. Serum samples obtained before vaccination were tested for diphtheria and tetanus antitoxin levels by means of neutralization assay and enzyme-linked immunosorbent assay. MAIN OUTCOME MEASURES: Rates of large local reactions (an area of redness or swelling or both of 5 cm or greater) 24 hours after vaccination in the two groups. Relation between serum antitoxin levels before vaccination and the rate of large local reactions in each group. RESULTS: Of the 250 subjects enrolled 124 received the standard vaccine and 126 the modified one. Large local reactions occurred in 71% of the subjects receiving the standard vaccine and 52% of those receiving the modified one (p less than 0.01). In the former group large erythematous reactions occurred significantly more often in those with an elevated prevaccination diphtheria antitoxin level than in those without an elevated level; no relation was found between such reactions and the prevaccination tetanus antitoxin level. Reduced arm movement was evident in 45% of the children in the two groups. Few had systemic adverse reactions. CONCLUSIONS: Large local reactions occur frequently after the preschool administration of the DPT vaccine. These reactions are uncomfortable but not serious. They result in part from the large amount of diphtheria toxoid in the standard DPT vaccine.  相似文献   
107.
本文作者改进了辣椒中辣椒素含量的测定法。即通过增设洋品空白管以消除色素的干扰;改变 Na_2CO_3溶液的浓度以缓和其操作条件及防止在低温时产生沉淀。本改良法具有简便、快速和重现性好之优点。  相似文献   
108.
Pleural cryptococcosis in the acquired immune deficiency syndrome   总被引:1,自引:0,他引:1  
T G Newman  A Soni  S Acaron  C T Huang 《Chest》1987,91(3):459-461
Pleural cryptococcosis is extremely rare. We report the first case of cryptococcal pleural effusion in association with the acquired immune deficiency syndrome. Pleural effusion without the evidence of pulmonary parenchymal involvement was the initial and only clinical finding leading to the diagnosis of disseminated cryptococcosis. The pleural effusion resolved spontaneously prior to amphotericin B therapy.  相似文献   
109.
110.
农民工结核病健康教育效果评价   总被引:1,自引:0,他引:1  
目的 探讨开展结核病健康教育对提高农民工相关知识知晓率和态度正确率的作用.方法 对重庆市南岸区农民工进行结核病相关知识的健康教育,教育方式是由专科医生进行专题讲座.健康教育讲座前后在同一现场统一发放问卷,并当场收回,对教育前后农民工的结核病相关知识作一一配对比较.结果 调查15项内容,其中有14项内容教育前后有显著性差异.教育前农民工结核病知识知晓率为67.5%,教育后知晓率为99.5%;正向态度报告率从教育前的44.1%提高到60.1%.结论 健康教育能提高农民工防治结核病知识知晓率和态度正确率,此方法值得推广.  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