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   1268772篇
  免费   73779篇
  国内免费   1387篇
耳鼻咽喉   16382篇
儿科学   41351篇
妇产科学   31953篇
基础医学   174402篇
口腔科学   31231篇
临床医学   108178篇
内科学   238361篇
皮肤病学   25268篇
神经病学   99028篇
特种医学   52452篇
外国民族医学   201篇
外科学   196411篇
综合类   24417篇
现状与发展   1篇
一般理论   264篇
预防医学   93424篇
眼科学   27416篇
药学   96643篇
  7篇
中国医学   3451篇
肿瘤学   83097篇
  2019年   7890篇
  2018年   34111篇
  2017年   27140篇
  2016年   31367篇
  2015年   12365篇
  2014年   16313篇
  2013年   23178篇
  2012年   37774篇
  2011年   54168篇
  2010年   38107篇
  2009年   30009篇
  2008年   51276篇
  2007年   56798篇
  2006年   33496篇
  2005年   34049篇
  2004年   34278篇
  2003年   34709篇
  2002年   31407篇
  2001年   60491篇
  2000年   62198篇
  1999年   51224篇
  1998年   12737篇
  1997年   11344篇
  1996年   11207篇
  1995年   10517篇
  1994年   9550篇
  1993年   9027篇
  1992年   37924篇
  1991年   36450篇
  1990年   35923篇
  1989年   34426篇
  1988年   30990篇
  1987年   30118篇
  1986年   28316篇
  1985年   26560篇
  1984年   19258篇
  1983年   16192篇
  1982年   8920篇
  1979年   17122篇
  1978年   11472篇
  1977年   10249篇
  1976年   8906篇
  1975年   10073篇
  1974年   11695篇
  1973年   11281篇
  1972年   10756篇
  1971年   10093篇
  1970年   9287篇
  1969年   8981篇
  1968年   7948篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
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   
3.
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   
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