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   1079237篇
  免费   73450篇
  国内免费   1385篇
耳鼻咽喉   15071篇
儿科学   34712篇
妇产科学   28665篇
基础医学   154051篇
口腔科学   29731篇
临床医学   95226篇
内科学   205089篇
皮肤病学   24481篇
神经病学   82236篇
特种医学   43240篇
外国民族医学   201篇
外科学   164170篇
综合类   21716篇
现状与发展   1篇
一般理论   263篇
预防医学   74771篇
眼科学   24624篇
药学   86423篇
  7篇
中国医学   2813篇
肿瘤学   66581篇
  2019年   7856篇
  2018年   11428篇
  2017年   9009篇
  2016年   10225篇
  2015年   11385篇
  2014年   15432篇
  2013年   22390篇
  2012年   30891篇
  2011年   32641篇
  2010年   19166篇
  2009年   17979篇
  2008年   30236篇
  2007年   32421篇
  2006年   33024篇
  2005年   31351篇
  2004年   30002篇
  2003年   28822篇
  2002年   27803篇
  2001年   60163篇
  2000年   61600篇
  1999年   51080篇
  1998年   12513篇
  1997年   11066篇
  1996年   11071篇
  1995年   10372篇
  1994年   9387篇
  1993年   8893篇
  1992年   37868篇
  1991年   36353篇
  1990年   35816篇
  1989年   34343篇
  1988年   30935篇
  1987年   30046篇
  1986年   28275篇
  1985年   26499篇
  1984年   19223篇
  1983年   16157篇
  1982年   8840篇
  1979年   17066篇
  1978年   11429篇
  1977年   10260篇
  1976年   8854篇
  1975年   10087篇
  1974年   11675篇
  1973年   11295篇
  1972年   10770篇
  1971年   10102篇
  1970年   9275篇
  1969年   8953篇
  1968年   7935篇
排序方式: 共有10000条查询结果,搜索用时 0 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