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   1279195篇
  免费   76793篇
  国内免费   1898篇
耳鼻咽喉   17854篇
儿科学   42042篇
妇产科学   34501篇
基础医学   180389篇
口腔科学   35616篇
临床医学   111111篇
内科学   240442篇
皮肤病学   29047篇
神经病学   95305篇
特种医学   53247篇
外国民族医学   287篇
外科学   193164篇
综合类   22870篇
现状与发展   1篇
一般理论   280篇
预防医学   92449篇
眼科学   29114篇
药学   100251篇
  9篇
中国医学   3076篇
肿瘤学   76831篇
  2018年   15707篇
  2017年   13354篇
  2016年   13984篇
  2015年   16531篇
  2014年   20240篇
  2013年   26960篇
  2012年   41734篇
  2011年   39161篇
  2010年   22285篇
  2009年   22409篇
  2008年   33991篇
  2007年   37040篇
  2006年   37651篇
  2005年   43638篇
  2004年   43561篇
  2003年   38216篇
  2002年   32583篇
  2001年   64062篇
  2000年   63616篇
  1999年   55885篇
  1998年   13161篇
  1997年   11474篇
  1996年   11535篇
  1995年   10794篇
  1994年   9792篇
  1993年   9217篇
  1992年   43324篇
  1991年   41956篇
  1990年   41644篇
  1989年   40023篇
  1988年   36182篇
  1987年   35027篇
  1986年   33069篇
  1985年   30823篇
  1984年   22203篇
  1983年   18585篇
  1982年   9720篇
  1979年   20274篇
  1978年   13413篇
  1977年   11793篇
  1976年   10220篇
  1975年   12191篇
  1974年   14375篇
  1973年   13675篇
  1972年   13189篇
  1971年   12536篇
  1970年   11565篇
  1969年   11201篇
  1968年   9967篇
  1967年   9085篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Quality of Life Research - The COVID-19 pandemic might add to the stressors experienced by people living with rheumatic diseases. This study aimed to examine rheumatic patients’ functional...  相似文献   
2.
Molnár  B.  Aroca  S.  Dobos  A.  Orbán  K.  Szabó  J.  Windisch  P.  Stähli  A.  Sculean  A. 《Clinical oral investigations》2022,26(12):7135-7142
Clinical Oral Investigations - To evaluate t he long-term outcomes following treatment of RT 1 multiple adjacent gingival recessions (MAGR) using the modified coronally advanced tunnel (MCAT) with...  相似文献   
3.
4.
5.
6.
7.
Comprehensive evidence regarding the treatment of non-anaemic iron deficiency in patients undergoing valvular heart surgery is lacking. This study aimed to investigate the association between non-anaemic iron deficiency and postoperative outcomes in these patients. We retrospectively analysed 321 patients of which 180 (56%) had iron deficiency (defined as serum ferritin < 100 ng.ml-1 or < 300 ng.ml-1 with transferrin saturation < 20%). While the iron-deficient group had lower pre-operative haemoglobin levels than the non-iron deficient group (median (IQR [range]) 134 (127–141 [120–172]) g.l-1, 143 (133–150 [120–179]) g.l-1, p = 0.001), there was no between-group difference in allogeneic red blood cell transfusion. Median (IQR [range]) days alive and out of hospital at postoperative day 90 was 1 day shorter in the iron-deficient group (80 (77–82 [9–85]) days vs. 81 (79–83 [0–85]) days, p = 0.026). In multivariable analysis, only cardiopulmonary bypass duration (p = 0.032) and intra-operative allogeneic red blood cell transfusion (p = 0.011) were significantly associated with reduced days alive and out of hospital at postoperative day 90. Iron deficiency did not exert any adverse influence on secondary outcomes except length of hospital stay. Our findings indicate that non-anaemic iron deficiency alone is not associated with adverse effects in patients undergoing valvular heart surgery when it does not translate into an increased risk of allogeneic transfusion.  相似文献   
8.
9.
Proceedings of the National Academy of Sciences, India Section B: Biological Sciences - Heavy metal concentrations in surface soils of Reserved Forests (RFs) have a significant impact on...  相似文献   
10.
Colorectal cancer (CRC) is the third most diagnosed cancer and the second leading cause of cancer-related mortality in the United States. Across the globe, people in the age group older than 50 are at a higher risk of CRC. Genetic and environmental risk factors play a significant role in the development of CRC. If detected early, CRC is preventable and treatable. Currently, available screening methods and therapies for CRC treatment reduce the incidence rate among the population, but the micrometastasis of cancer may lead to recurrence. Therefore, the challenge is to develop an alternative therapy to overcome this complication. Nanotechnology plays a vital role in cancer treatment and offers targeted chemotherapies directly and selectively to cancer cells, with enhanced therapeutic efficacy. Additionally, nanotechnology elevates the chances of patient survival in comparison to traditional chemotherapies. The potential of nanoparticles includes that they may be used simultaneously for diagnosis and treatment. These exciting properties of nanoparticles have enticed researchers worldwide to unveil their use in early CRC detection and as effective treatment. This review discusses contemporary methods of CRC screening and therapies for CRC treatment, while the primary focus is on the theranostic approach of nanotechnology in CRC treatment and its prospects. In addition, this review aims to provide knowledge on the advancement of nanotechnology in CRC and as a starting point for researchers to think about new therapeutic approaches using nanotechnology.  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