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   200538篇
  免费   3210篇
  国内免费   56篇
耳鼻咽喉   1452篇
儿科学   7554篇
妇产科学   3675篇
基础医学   19976篇
口腔科学   1811篇
临床医学   15271篇
内科学   35294篇
皮肤病学   1312篇
神经病学   19131篇
特种医学   9586篇
外国民族医学   5篇
外科学   31731篇
综合类   2663篇
一般理论   19篇
预防医学   21301篇
眼科学   3111篇
药学   11175篇
中国医学   640篇
肿瘤学   18097篇
  2023年   238篇
  2022年   426篇
  2021年   930篇
  2020年   508篇
  2019年   914篇
  2018年   22748篇
  2017年   17954篇
  2016年   20103篇
  2015年   1673篇
  2014年   1871篇
  2013年   2064篇
  2012年   8824篇
  2011年   22826篇
  2010年   19697篇
  2009年   12314篇
  2008年   20857篇
  2007年   23118篇
  2006年   1867篇
  2005年   3374篇
  2004年   4507篇
  2003年   5280篇
  2002年   3365篇
  2001年   648篇
  2000年   857篇
  1999年   524篇
  1998年   467篇
  1997年   372篇
  1996年   255篇
  1995年   250篇
  1994年   239篇
  1993年   187篇
  1992年   328篇
  1991年   318篇
  1990年   381篇
  1989年   291篇
  1988年   273篇
  1987年   238篇
  1986年   204篇
  1985年   238篇
  1984年   155篇
  1983年   118篇
  1982年   130篇
  1980年   120篇
  1979年   119篇
  1978年   113篇
  1977年   85篇
  1976年   110篇
  1975年   85篇
  1974年   114篇
  1973年   97篇
排序方式: 共有10000条查询结果,搜索用时 281 毫秒
91.
Research on physical activity (PA) by level of acculturation in Hispanic children is limited and findings have been mixed. We examined PA participation by primary language used with parents in a representative sample of 4th, 8th, and 11th grade Texas public school students. Mixed-effects regression models were conducted using cross-sectional data from the 2004–2005 School Physical Activity and Nutrition Study (n = 22,049). Self-reported PA was compared among three language-ethnic groups: Spanish-Hispanic (SH) (referent); English-Hispanic (EH); and English-Other (EO). EH and/or EO girls were generally between 1.25 and 2.58 [OR] times more likely to participate in PA across grade levels, with the largest differences found for school sports in 8th grade girls. EH and EO 8th grade boys were 1.71 (CI: 1.40, 2.10) and 2.06 (CI: 1.68, 2.51) times, respectively, more likely to participate in school sports. Findings indicate important disparities in Spanish-speaking Hispanic children’s PA participation.  相似文献   
92.

Introduction  

Planning human resources for health (HRH) is a complex process for policy-makers and, as a result, many countries worldwide swing from surplus to shortage. In-depth case studies can help appraising the challenges encountered and the solutions implemented. This paper has two objectives: to identify the key challenges in HRH planning in Belgium and to formulate recommendations for an effective HRH planning, on the basis of the Belgian case study and lessons drawn from an international benchmarking.  相似文献   
93.

Objective  

The aim of the project was to assess the effectiveness and safety of weekly epoetin-beta (EB) in patients with gastrointestinal cancer (GIC) subjected to concomitant chemoradiotherapy (CCTRT).  相似文献   
94.
Extravasation of chemotherapy is a feared complication of anticancer therapy. The accidental leakage of cytostatic agents into the perivascular tissues may have devastating short-term and long-term consequences for patients. In recent years, the increased focus on chemotherapy extravasation has led to the development of international guidelines that have proven useful tools in daily clinical practice. Moreover, the tissue destruction in one of the most dreaded types of extravasation (ie, anthracycline extravasation) now can effectively be prevented with a specific antidote, dexrazoxane.  相似文献   
95.
Hypoxia is related to poor prognosis because it is associated to chemo-and radioresistance. During recent years the evolution of imaging methods like PET/CT and MRI has meant the appearance of new perspectives with direct implications in radiation therapy. We discuss previous experiences in staging, planning and in the follow-up process with these techniques for measuring tumour hypoxia.  相似文献   
96.

Background  

Bortezomib, a proteasome-specific inhibitor, has emerged as a promising cancer therapeutic agent. However, development of resistance to bortezomib may pose a challenge to effective anticancer therapy. Therefore, characterization of cellular mechanisms involved in bortezomib resistance and development of effective strategies to overcome this resistance represent important steps in the advancement of bortezomib-mediated cancer therapy.  相似文献   
97.

Background  

The fibromyalgia syndrome (FMS) is suggested to be a manifestation of depression or affective spectrum disorder. We measured the cognitive style of patients with FMS to assess personality styles in 44 patients with fibromyalgia syndrome (FMS) by comparing them with 43 patients with major depressive disorder (MDD) and 41 healthy controls (HC).  相似文献   
98.
99.
100.
Background Transarterial chemoemobolization (TACE) is commonly used to treat metastatic carcinoid tumors; however, the management of progressive disease is less clear. We sought to determine if patients with disease progression after TACE would benefit from repeat TACE. Methods The records of 27 patients undergoing repeat TACE for radiologic or symptomatic progression after TACE for metastatic carcinoid were reviewed and compared to 122 undergoing first TACE. Overall and progression-free survivals were estimated by the Kaplan–Meier method. Results Mean disease-free interval after first TACE was 11.8 months. Radiologic response was observed in 61% compared to 82% after first TACE (p = 0.058); hormone response in 64% compared to 80% (p = 0.159); and symptomatic response in 77% compared to 92% (p = 0.053). The complication rate after repeat TACE was lower than after first TACE (p = 0.03). Median overall survival was similar after repeat (28.1 months) and first TACE (33.3 months) (p = 0.53). Progression-free survival was shorter after repeat TACE but not significantly so. No factor examined could predict survival after repeat TACE. Conclusion Repeat TACE for patients with hepatic carcinoid metastases failing first TACE or having evidence of disease progression is safe and offers a viable treatment option. Presented at the 48th Annual Meeting of The Society for Surgery of the Alimentary Tract, Washington, DC, May, 2007.  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