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   1104859篇
  免费   75809篇
  国内免费   1770篇
耳鼻咽喉   15357篇
儿科学   35558篇
妇产科学   29200篇
基础医学   158060篇
口腔科学   30043篇
临床医学   97807篇
内科学   210272篇
皮肤病学   25114篇
神经病学   83869篇
特种医学   44183篇
外国民族医学   217篇
外科学   167093篇
综合类   22952篇
现状与发展   2篇
一般理论   265篇
预防医学   76933篇
眼科学   25122篇
药学   88573篇
  13篇
中国医学   3435篇
肿瘤学   68370篇
  2021年   8598篇
  2019年   8549篇
  2018年   12294篇
  2017年   9625篇
  2016年   10798篇
  2015年   12133篇
  2014年   16387篇
  2013年   23634篇
  2012年   32651篇
  2011年   34397篇
  2010年   20250篇
  2009年   18872篇
  2008年   31484篇
  2007年   33658篇
  2006年   34246篇
  2005年   32471篇
  2004年   31007篇
  2003年   29778篇
  2002年   28690篇
  2001年   61038篇
  2000年   62472篇
  1999年   51851篇
  1998年   12780篇
  1997年   11284篇
  1996年   11261篇
  1995年   10515篇
  1994年   9546篇
  1993年   9022篇
  1992年   38269篇
  1991年   36744篇
  1990年   36190篇
  1989年   34694篇
  1988年   31291篇
  1987年   30344篇
  1986年   28577篇
  1985年   26792篇
  1984年   19431篇
  1983年   16294篇
  1982年   8936篇
  1979年   17233篇
  1978年   11512篇
  1977年   10346篇
  1976年   8950篇
  1975年   10164篇
  1974年   11779篇
  1973年   11373篇
  1972年   10874篇
  1971年   10171篇
  1970年   9347篇
  1969年   9038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.
8.
Inflammatory bowel disease (IBD) is a chronic disease that requires chronic treatment throughout the evolution of the disease, with a complex physiopathology that entails great challenges for the development of new and specific treatments for ulcerative colitis and Crohn´s disease. The anti-tumor necrosis factor alpha therapy has impacted the clinical course of IBD in those patients who do not respond to conventional treatment, so there is a need to develop new therapies and markers of treatment response. Various pathways involved in the development of the disease are known and the new therapies have focused on blocking the inflammatory process at the gastrointestinal level by oral, intravenous, subcutaneous, and topical route. All these new therapies can lead to more personalized treatments with higher success rates and fewer relapses. These treatments have not only focused on clinical remission, but also on achieving macroscopic changes at the endoscopic level and microscopic changes by achieving mucosal healing. These treatments are mainly based on modifying signaling pathways, by blocking receptors or ligands, reducing cell migration and maintaining the integrity of the epithelial barrier. Therefore, this review presents the efficacy and safety of the new treatments that are currently under study and the advances that have been made in this area in recent years.  相似文献   
9.
10.
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   
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