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   2652篇
  免费   239篇
  国内免费   48篇
耳鼻咽喉   6篇
儿科学   189篇
妇产科学   90篇
基础医学   357篇
口腔科学   63篇
临床医学   299篇
内科学   430篇
皮肤病学   29篇
神经病学   172篇
特种医学   152篇
外科学   242篇
综合类   54篇
一般理论   3篇
预防医学   176篇
眼科学   40篇
药学   229篇
  1篇
肿瘤学   407篇
  2022年   15篇
  2021年   27篇
  2020年   16篇
  2019年   22篇
  2018年   49篇
  2017年   39篇
  2016年   36篇
  2015年   49篇
  2014年   67篇
  2013年   83篇
  2012年   93篇
  2011年   90篇
  2010年   76篇
  2009年   56篇
  2008年   78篇
  2007年   101篇
  2006年   102篇
  2005年   115篇
  2004年   99篇
  2003年   96篇
  2002年   67篇
  2001年   75篇
  2000年   73篇
  1999年   76篇
  1998年   70篇
  1997年   79篇
  1996年   78篇
  1995年   59篇
  1994年   48篇
  1993年   49篇
  1992年   47篇
  1991年   57篇
  1990年   65篇
  1989年   74篇
  1988年   70篇
  1987年   63篇
  1986年   61篇
  1985年   50篇
  1984年   48篇
  1983年   39篇
  1982年   28篇
  1981年   29篇
  1980年   23篇
  1979年   18篇
  1978年   34篇
  1977年   19篇
  1976年   21篇
  1975年   15篇
  1974年   24篇
  1973年   18篇
排序方式: 共有2939条查询结果,搜索用时 500 毫秒
1.
2.
Stuart Cathcart  BA    Donald Pritchard  PhD 《Headache》1998,38(3):214-221
An exploratory study was conducted examining arousal-related moods and episodic tension-type headache. Twelve subjects meeting International Headache Society criteria for episodic tension-type headache and 12 headache-free controls recorded headache activity and mood eight times daily for 14 consecutive days. Moods were measured using the Activation-Deactivation Adjective Check List, a self-report list that subjectively represents general arousal along two dimensions of Tension and Energy. Headache subjects had higher Tension levels than controls even in the absence of pain, and greater variation in this dimension as well. Within the headache group, Tension during pain-free periods was significantly lower than when experiencing headache, and was correlated with headache activity. The results were taken to support Thayer's (1989) biopsychological model of mood and arousal, and are discussed in terms of the model's heuristic value for general arousal and headache research.  相似文献   
3.
4.
The history and epidemiology of bovine tuberculosis in cattle herds in East Sussex are described. Since 1960, following the compulsory eradication scheme for tuberculosis, the incidence of herd infection has been low. The epidemiological features of herd infection have been sporadic incidents, with only small numbers of cattle becoming infected in the majority of incidents. There was no evidence of endemic Mycobacterium bovis infection in the cattle population in East Sussex in recent years, but a low risk of infection for cattle on the South Downs, from badgers, was apparent.  相似文献   
5.

Background  

Shoulder disorders are a common health problem in western societies. Several treatment protocols have been developed for the clinical management of persons with shoulder pain. However available evidence does not support any protocol as being superior over others. Systematic reviews provide some evidence that certain physical therapy interventions (i.e. supervised exercises and mobilisation) are effective in particular shoulder disorders (i.e. rotator cuff disorders, mixed shoulder disorders and adhesive capsulitis), but there is an ongoing need for high quality trials of physical therapy interventions. Usually, physical therapy consists of active exercises intended to strengthen the shoulder muscles as stabilizers of the glenohumeral joint or perform mobilisations to improve restricted mobility of the glenohumeral or adjacent joints (shoulder girdle). It is generally accepted that a-traumatic shoulder problems are the result of impingement of the subacromial structures, such as the bursa or rotator cuff tendons. Myofascial trigger points (MTrPs) in shoulder muscles may also lead to a complex of symptoms that are often seen in patients diagnosed with subacromial impingement or rotator cuff tendinopathy. Little is known about the treatment of MTrPs in patients with shoulder disorders.  相似文献   
6.
7.
8.
9.
10.
Depression and smoking in pregnancy in Scotland.   总被引:6,自引:1,他引:5       下载免费PDF全文
OBJECTIVE--The aim was to examine the association between depressive symptoms and smoking in pregnancy and to investigate the part played by social and psychosocial factors. SETTING--A single Glasgow hospital. DESIGN--Prospective survey by postal questionnaires at 20 and 30 weeks' gestation. PARTICIPANTS--A total of 395 women (69% of the 572 eligible) parity 1 who booked for delivery between November 1988 and February 1990 took part. MEASUREMENTS--Depressive symptoms were measured using the Hospital Anxiety and Depression Scale. Smoking was self reported. The Life Events Inventory and measures of role specific strain and stress in domestic roles were used to assess psychosocial well being. MAIN RESULTS--Smokers were more likely than non-smokers to experience depressive symptoms at 20 and 30 weeks' gestation and on both occasions. The excess risk remained substantial and significant after adjustment for social and psychosocial factors. CONCLUSIONS--Smoking is a significant risk factor for depression in pregnancy. The association of smoking with depression and psychosocial difficulty represents a major problem for interventions intended to reduce smoking in pregnancy.  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