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   1003370篇
  免费   74940篇
  国内免费   6902篇
耳鼻咽喉   13505篇
儿科学   25146篇
妇产科学   23790篇
基础医学   140304篇
口腔科学   29428篇
临床医学   89682篇
内科学   192515篇
皮肤病学   19803篇
神经病学   75737篇
特种医学   39771篇
外国民族医学   118篇
外科学   159931篇
综合类   33588篇
现状与发展   15篇
一般理论   250篇
预防医学   67467篇
眼科学   22822篇
药学   80789篇
  85篇
中国医学   7163篇
肿瘤学   63303篇
  2021年   9019篇
  2019年   8115篇
  2018年   11320篇
  2017年   9337篇
  2016年   9837篇
  2015年   12327篇
  2014年   16294篇
  2013年   21810篇
  2012年   30398篇
  2011年   32085篇
  2010年   19772篇
  2009年   18442篇
  2008年   29201篇
  2007年   30258篇
  2006年   30785篇
  2005年   29344篇
  2004年   27287篇
  2003年   26027篇
  2002年   25209篇
  2001年   56287篇
  2000年   57950篇
  1999年   48057篇
  1998年   11482篇
  1997年   10191篇
  1996年   10154篇
  1995年   9434篇
  1994年   8660篇
  1993年   7874篇
  1992年   35715篇
  1991年   34091篇
  1990年   32910篇
  1989年   32039篇
  1988年   29120篇
  1987年   28362篇
  1986年   26380篇
  1985年   25233篇
  1984年   17875篇
  1983年   15166篇
  1982年   7817篇
  1979年   15798篇
  1978年   10601篇
  1977年   9054篇
  1976年   7874篇
  1975年   8628篇
  1974年   10468篇
  1973年   9862篇
  1972年   9360篇
  1971年   8855篇
  1970年   8427篇
  1969年   7923篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
李盼  陈雨微  丁丽琴  曹世杰  张德芹  邱峰 《中草药》2019,50(22):5577-5583
辛味是中药五味学说中的重要性味之一,通常具有“发散”“行气”和“行血”的作用,且辛味中药在传统医学临床应用中占有较大比例。结合中药辛味的功效内涵及传统中医理论对消渴证的认识,阐述辛味中药与消渴证治疗之间的内在联系,总结辛味中药对“消渴三消”的治疗意义与价值。并在此基础上,对中药五味理论的现代研究趋势和发展方向进行思考,为同行研究提供参考。  相似文献   
122.
123.
Our aim was to evaluate the long-term skeletal stability of the mandible in 21 patients after orthognathic surgery with physiological positioning. The measurement points SNB, B point (X, Y), Pog (X, Y), and the angle of the ramus were measured on cephalometric photographs to assess skeletal stability preoperatively, immediately after operation, and one and two years postoperatively. In addition, we evaluated the clinical symptoms of disorders of the temporomandibular joint (TMJ). The analysis of the cephalometric photographs showed that SNB, B point X, and Pog X showed no significant differences among the postoperative time points. On the other hand, B point Y and Pog Y showed no significant differences throughout the study period. We compared the angle of the ramus before operation and two years postoperatively, and no significant difference was found. In addition, no cases showed any pathological symptoms of disorders of the TMJ two years postoperatively. The long-term stability after orthognathic surgery with physiological positioning was confirmed, and it seems to be a reliable orthognathic treatment in patients with mandibular prognathism.  相似文献   
124.
Purpose of the study: the aim of this study was to synthesize PFC fNIRS outcomes on the effects of cognitive tasks compared to resting/baseline tasks in healthy adults from studies utilizing a pre/post design.

Material and methods: original research studies were searched from seven databases (MEDLINE, EMBASE, CENTRAL, CINAHL, SCOPUS, PEDro and PubMed). Subsequently, two independent reviewers screened the titles and abstracts followed by full-text reviews to assess the studies' eligibility.

Results: eleven studies met the inclusion criteria and had data abstracted and quality assessed. Methodology varied considerably and yet cognitive tasks resulted in the ΔO2Hb increasing in 8 of the 11 and ΔHHb decreasing in 8 of 8 studies that reported this outcome. The cognitive tasks from 10 of the 11 studies were classified as “Working Memory” and “Verbal Fluency Tasks”.

Conclusions: although, the data comparison was challenging provided the heterogeneity in methodology, the results across studies were similar.  相似文献   

125.
126.
127.

Background

The optimal noninvasive test (NIT) for patients with diabetes and stable symptoms of coronary artery disease (CAD) is unknown.

Objectives

The purpose of this study was to assess whether a diagnostic strategy based on coronary computed tomographic angiography (CTA) is superior to functional stress testing in reducing adverse cardiovascular (CV) outcomes (CV death or myocardial infarction [MI]) among symptomatic patients with diabetes.

Methods

PROMISE (Prospective Multicenter Imaging Study for Evaluation of Chest Pain) was a randomized trial evaluating an initial strategy of CTA versus functional testing in stable outpatients with symptoms suggestive of CAD. The study compared CV outcomes in patients with diabetes (n = 1,908 [21%]) and without diabetes (n = 7,058 [79%]) based on their randomization to CTA or functional testing.

Results

Patients with diabetes (vs. without) were similar in age (median 61 years vs. 60 years) and sex (female 54% vs. 52%) but had a greater burden of CV comorbidities. Patients with diabetes who underwent CTA had a lower risk of CV death/MI compared with functional stress testing (CTA: 1.1% [10 of 936] vs. stress testing: 2.6% [25 of 972]; adjusted hazard ratio: 0.38; 95% confidence interval: 0.18 to 0.79; p = 0.01). There was no significant difference in nondiabetic patients (CTA: 1.4% [50 of 3,564] vs. stress testing: 1.3% [45 of 3,494]; adjusted hazard ratio: 1.03; 95% confidence interval: 0.69 to 1.54; p = 0.887; interaction term for diabetes p value = 0.02).

Conclusions

In diabetic patients presenting with stable chest pain, a CTA strategy resulted in fewer adverse CV outcomes than a functional testing strategy. CTA may be considered as the initial diagnostic strategy in this subgroup. (PROspective Multicenter Imaging Study for Evaluation of Chest Pain [PROMISE]; NCT01174550)  相似文献   
128.
Lung - Diaphragmatic paralysis (DP) is an important cause of dyspnea with many underlying etiologies; however, frequently no cause is identified despite extensive investigation. We hypothesized...  相似文献   
129.
130.
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