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   1079172篇
  免费   73411篇
  国内免费   1392篇
耳鼻咽喉   15087篇
儿科学   34723篇
妇产科学   28708篇
基础医学   154114篇
口腔科学   29717篇
临床医学   95306篇
内科学   204875篇
皮肤病学   24510篇
神经病学   81830篇
特种医学   43260篇
外国民族医学   201篇
外科学   164308篇
综合类   21725篇
现状与发展   1篇
一般理论   264篇
预防医学   74727篇
眼科学   24595篇
药学   86446篇
  7篇
中国医学   2817篇
肿瘤学   66754篇
  2019年   7860篇
  2018年   11401篇
  2017年   9017篇
  2016年   10209篇
  2015年   11388篇
  2014年   15427篇
  2013年   22373篇
  2012年   30848篇
  2011年   32611篇
  2010年   19129篇
  2009年   17967篇
  2008年   30219篇
  2007年   32378篇
  2006年   33007篇
  2005年   31357篇
  2004年   30010篇
  2003年   28831篇
  2002年   27831篇
  2001年   60160篇
  2000年   61612篇
  1999年   51072篇
  1998年   12538篇
  1997年   11064篇
  1996年   11092篇
  1995年   10359篇
  1994年   9394篇
  1993年   8894篇
  1992年   37885篇
  1991年   36362篇
  1990年   35817篇
  1989年   34352篇
  1988年   30941篇
  1987年   30058篇
  1986年   28261篇
  1985年   26498篇
  1984年   19228篇
  1983年   16156篇
  1982年   8843篇
  1979年   17059篇
  1978年   11435篇
  1977年   10254篇
  1976年   8860篇
  1975年   10093篇
  1974年   11675篇
  1973年   11298篇
  1972年   10783篇
  1971年   10117篇
  1970年   9270篇
  1969年   8962篇
  1968年   7937篇
排序方式: 共有10000条查询结果,搜索用时 14 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