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   37522篇
  免费   3846篇
  国内免费   27篇
耳鼻咽喉   219篇
儿科学   1260篇
妇产科学   1085篇
基础医学   5197篇
口腔科学   733篇
临床医学   4625篇
内科学   6725篇
皮肤病学   572篇
神经病学   3261篇
特种医学   1498篇
外国民族医学   3篇
外科学   4633篇
综合类   801篇
一般理论   49篇
预防医学   4747篇
眼科学   996篇
药学   2745篇
中国医学   48篇
肿瘤学   2198篇
  2022年   291篇
  2021年   655篇
  2020年   367篇
  2019年   621篇
  2018年   673篇
  2017年   515篇
  2016年   566篇
  2015年   602篇
  2014年   822篇
  2013年   1259篇
  2012年   1782篇
  2011年   1806篇
  2010年   1076篇
  2009年   949篇
  2008年   1654篇
  2007年   1746篇
  2006年   1720篇
  2005年   1671篇
  2004年   1616篇
  2003年   1520篇
  2002年   1436篇
  2001年   1229篇
  2000年   1236篇
  1999年   1059篇
  1998年   449篇
  1997年   405篇
  1996年   382篇
  1995年   326篇
  1994年   349篇
  1993年   348篇
  1992年   849篇
  1991年   823篇
  1990年   792篇
  1989年   682篇
  1988年   716篇
  1987年   677篇
  1986年   628篇
  1985年   677篇
  1984年   554篇
  1983年   440篇
  1982年   282篇
  1981年   296篇
  1979年   477篇
  1978年   351篇
  1977年   265篇
  1976年   279篇
  1975年   265篇
  1974年   302篇
  1973年   269篇
  1972年   276篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
This paper describes the introduction of a district nursing job-share in a primary health care team. Exploring change theory and different strategies for organizational change, the implications for members of the team are considered. In addition, changes in the balance of power which resulted in conflict within the district nursing team are discussed.  相似文献   
62.
Book reviews     
  相似文献   
63.
OBJECTIVES: to evaluate the Saville and Holdsworth Occupational Personality Questionnaire (OPQ) to assess its potential and validity as a tool in the recruitment of doctors. To determine the range of personality characteristics in a group of general practitioners. DESIGN: an administered commercially available questionnaire. SETTING: general practitioners in North and Mid. Stafftordshire. SUBJECTS: 133 general practitioners or trainees. RESULTS: 44% of general practitioners agreed to participate. The majority found it useful and recognised its potential to increase self-awareness, highlight weaknesses that might be improved and for future recruitment of others to their teams. Doctors' personality traits were similar to those of managerial/professional norms. The validity of the OPQ was supported by (a) significant associations with subjects' previously reported mental health problems and (b) 83% of respondents confirming that their reports correctly described their personalities at work. CONCLUSIONS: OPQs have a place in the recruitment of doctors by identifying appropriate people to strengthen the team.  相似文献   
64.
Glucose tolerance is determined by the balance of insulin secretion and insulin action and deteriorates with age. Insulin secretion does not appear to be reduced with increasing age, but many recent studies have demonstrated insulin resistance in healthy elderly subjects. However, this has not been a universal finding and the reasons for the discrepant results probably include general health, physical training, changes of liver size and delays in carbohydrate absorption. When confounding factors, particularly physical activity, are taken into account there appears to be little or no change in insulin action with age. Delays in monosacharride absorption may play a role. Maintaining physical fitness throughout middle and older age and so reducing hyperinsulinaemia may have benefits on reducing vascular disease.  相似文献   
65.
66.
67.
A retrospective analysis of the results of the first attempt at in vitro fertilization (IVF) treatment in 447 couples was performed by chart review. In 124 couples the female partners smoked cigarettes, and in 236 couples they did not. A total of 69 pregnancies (19.2%) were achieved, 50 in nonsmokers (21.2% per cycle), and 19 in smokers (15.3% per cycle). There were no significant differences in these cycles between the two groups in peak estradiol level achieved, the number of eggs retrieved, fertilization rate, or implantation rate. The incidence of spontaneous abortion was higher in smokers (42.1%) than in nonsmokers (18.9%). Consequently, the delivery rate per cycle of IVF was significantly lower in the smoking group (11 of 124, 9.6%) than in the nonsmokers (40 of 236, 17.0%). There was no effect when only the husband was a smoker. From these data, smoking appears to significantly reduce the chances of successful pregnancy after IVF treatment.  相似文献   
68.
69.
To further investigate a clinical impression that patients with early onset pauciarticular juvenile rheumatoid arthritis (EOPA-JRA) who carry HLA-DQw1 have more severe arthritis, we subtyped HLA-DQw1 in American midwestern patients with EOPA-JRA. The HLA-DQA1*0101 subtype was present in 10 of 19 patients who developed persistent polyarticular erosive disease compared with 18 of 92 healthy controls (chi 2 = 9.13, p = 0.003, RR = 4.6), and occurred more frequently in this polyarticular group than in patients without polyarticular erosive disease (chi 2 = 4.11, p = 0.040, RR = 3.0). The presence of HLA-DQA1*0101 was significantly lower in patients with chronic iridocyclitis than in patients without chronic iridocyclitis (chi 2 = 7.07, p = 0.008, RR = 0.21). In HLA-DQA1*0101 positive patients, DNA sequences of the beta-1 domain of the HLA-DQ alpha and HLA-DQ beta genes (HLA-DQA1*0101, HLA-DQB1*0501 and HLA-DQB1*0503) were identical to those in controls. In this midwestern EOPA-JRA population, HLA-DQA1*0101 or genes in linkage disequilibrium with it, are associated with a cohort of patients with EOPA-JRA with distinct clinical characteristics.  相似文献   
70.
Two patients with acutely thrombosed femorofemoral bypass grafts are presented. Recombinant human tissue-type plasminogen activator (rt-PA) was used successfully in thrombolysis of the occluded grafts. Utilizing a new technique the grafts were punctured directly and bolus doses of rt-PA administered.  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