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   1074374篇
  免费   73341篇
  国内免费   1363篇
耳鼻咽喉   15093篇
儿科学   34605篇
妇产科学   28624篇
基础医学   153696篇
口腔科学   29623篇
临床医学   94953篇
内科学   203758篇
皮肤病学   24430篇
神经病学   81615篇
特种医学   43054篇
外国民族医学   202篇
外科学   163317篇
综合类   21702篇
现状与发展   1篇
一般理论   263篇
预防医学   74597篇
眼科学   24501篇
药学   86174篇
  7篇
中国医学   2805篇
肿瘤学   66058篇
  2019年   7787篇
  2018年   11324篇
  2017年   8934篇
  2016年   10134篇
  2015年   11293篇
  2014年   15322篇
  2013年   22289篇
  2012年   30641篇
  2011年   32400篇
  2010年   19005篇
  2009年   17853篇
  2008年   30036篇
  2007年   32155篇
  2006年   32799篇
  2005年   31108篇
  2004年   29791篇
  2003年   28618篇
  2002年   27607篇
  2001年   60072篇
  2000年   61515篇
  1999年   50969篇
  1998年   12468篇
  1997年   11021篇
  1996年   11032篇
  1995年   10336篇
  1994年   9364篇
  1993年   8868篇
  1992年   37827篇
  1991年   36304篇
  1990年   35784篇
  1989年   34318篇
  1988年   30887篇
  1987年   29998篇
  1986年   28234篇
  1985年   26464篇
  1984年   19206篇
  1983年   16124篇
  1982年   8834篇
  1979年   17053篇
  1978年   11419篇
  1977年   10239篇
  1976年   8852篇
  1975年   10079篇
  1974年   11659篇
  1973年   11290篇
  1972年   10775篇
  1971年   10110篇
  1970年   9255篇
  1969年   8941篇
  1968年   7928篇
排序方式: 共有10000条查询结果,搜索用时 109 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