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   2144254篇
  免费   165591篇
  国内免费   3562篇
耳鼻咽喉   29130篇
儿科学   70680篇
妇产科学   59812篇
基础医学   313250篇
口腔科学   63112篇
临床医学   190271篇
内科学   413854篇
皮肤病学   46624篇
神经病学   167411篇
特种医学   84086篇
外国民族医学   534篇
外科学   323630篇
综合类   51126篇
现状与发展   4篇
一般理论   692篇
预防医学   163246篇
眼科学   49449篇
药学   163048篇
  6篇
中国医学   4864篇
肿瘤学   118578篇
  2018年   20812篇
  2016年   18126篇
  2015年   20731篇
  2014年   28387篇
  2013年   43063篇
  2012年   58326篇
  2011年   61538篇
  2010年   36359篇
  2009年   34567篇
  2008年   58499篇
  2007年   61906篇
  2006年   63066篇
  2005年   60645篇
  2004年   59719篇
  2003年   56801篇
  2002年   55706篇
  2001年   101823篇
  2000年   104955篇
  1999年   88433篇
  1998年   23743篇
  1997年   21245篇
  1996年   21377篇
  1995年   20809篇
  1994年   19480篇
  1993年   18235篇
  1992年   72281篇
  1991年   70800篇
  1990年   69132篇
  1989年   67252篇
  1988年   62320篇
  1987年   61037篇
  1986年   58167篇
  1985年   55866篇
  1984年   41637篇
  1983年   35628篇
  1982年   20619篇
  1981年   18457篇
  1980年   17321篇
  1979年   39237篇
  1978年   27343篇
  1977年   23025篇
  1976年   21901篇
  1975年   23348篇
  1974年   28272篇
  1973年   27129篇
  1972年   25057篇
  1971年   23536篇
  1970年   21910篇
  1969年   20432篇
  1968年   18730篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
Cidofovir is an acyclic nucleoside phosphonate with broad-spectrum activity against DNA viruses, including human papilloma virus (HPV). However, data on the efficacy of cidofovir in an immunosuppressive setting remain contradictory. We report for the first time on the promotion of the healing of recalcitrant warts in a patient with myelodysplastic syndrome with intravenous cidofovir treatment.  相似文献   
102.
The incidence of asthma has been reported to be associated with obesity. An alternative analysis, of net change in prevalence, does not require exclusion of those with asthma at baseline. Follow-up data were obtained from 9,552 participants in the European Community Respiratory Health Survey and the Swiss cohort Study on Air Pollution and Lung Disease in Adults. Incidence of asthma was analysed by proportional hazards regression, and net changes in symptoms and asthma status by generalised estimating equations, by obesity group. Incidence and net change in ever having had asthma were greater in females than in males, and in participants who remained obese compared with those who were never obese (hazard ratio 2.00, 95% confidence interval 1.25-3.20; excess net change 2.8%, 0.4-5.3% per 10 yrs). The effect of being obese on net change in diagnosed asthma was greater in females than in males, but for net change in wheeze without a cold it was greater in males. The present results are consistent with asthma being more frequently diagnosed in females, especially obese females. These findings may help to explain the reports of a stronger association between asthma and obesity in females than in males.  相似文献   
103.
104.
105.
106.
107.
A 19-item survey instrument was designed and mailed by the Infectious Diseases Society of America to its membership to determine the media preferred by infectious diseases physicians for continuing medical education on general topics and on antimicrobial resistance. The objective of the survey was to offer the developers of educational programs knowledge on which to base more-effective ways to deliver educational materials to physicians in this specialty.  相似文献   
108.
109.
OBJECTIVE: To assess the effects of adding combined estradiol/norethisterone acetate therapy (CENT) to goserelin acetate treatment (GA) of dysfunctional uterine bleeding (DUB) in perimenopausal women. METHODS: In a randomized, placebo-controlled, double-blind trial followed by an open follow-up study, 31 perimenopausal women with DUB were recruited from gynecological outpatient departments of two Dutch hospitals and randomized for treatment with either GA/placebo or GA/CENT for 6 months followed by 18 months of GA/CENT for all. The main outcome measures were abdominal pain, number of bleeding days, double-layer endometrial thickness (DET), Greene climacteric score (GCS), visual analog scale for well-being, bone mineral density (BMD) and mammographic density (BI-RAD score). RESULTS: Abdominal pain, number of bleeding days and DET decreased in both groups, the between-group difference in decrease not being statistically significant. GCS initially showed significant improvement in the GA/CENT group. BMD decreased significantly in the GA/placebo group (-4.1%) compared with the GA/CENT group (-0.3%). Another 18 months of GA/CENT did not result in a lasting difference in BMD between groups. BI-RAD scores did not differ significantly between or within the two groups. CONCLUSIONS: Adding CENT to GA treatment for DUB in perimenopausal women initially prevented BMD loss and improved climacteric complaints, while having no negative impact on vaginal bleeding, abdominal pain or BI-RAD scores. However, prolonged treatment did not result in a lasting prevention of bone loss.  相似文献   
110.
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