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   1237530篇
  免费   76537篇
  国内免费   1780篇
耳鼻咽喉   17330篇
儿科学   40732篇
妇产科学   33459篇
基础医学   174875篇
口腔科学   34383篇
临床医学   107579篇
内科学   232735篇
皮肤病学   28226篇
神经病学   91556篇
特种医学   51981篇
外国民族医学   287篇
外科学   187784篇
综合类   22676篇
现状与发展   1篇
一般理论   264篇
预防医学   88817篇
眼科学   28188篇
药学   97478篇
  9篇
中国医学   2926篇
肿瘤学   74561篇
  2018年   14586篇
  2017年   12542篇
  2016年   13052篇
  2015年   15707篇
  2014年   19174篇
  2013年   25299篇
  2012年   39332篇
  2011年   36405篇
  2010年   20881篇
  2009年   21215篇
  2008年   31767篇
  2007年   34586篇
  2006年   35401篇
  2005年   41372篇
  2004年   41460篇
  2003年   36094篇
  2002年   30586篇
  2001年   63332篇
  2000年   62804篇
  1999年   55253篇
  1998年   12888篇
  1997年   11223篇
  1996年   11329篇
  1995年   10612篇
  1994年   9624篇
  1993年   9081篇
  1992年   43021篇
  1991年   41720篇
  1990年   41409篇
  1989年   39775篇
  1988年   35962篇
  1987年   34841篇
  1986年   32873篇
  1985年   30584篇
  1984年   22029篇
  1983年   18442篇
  1982年   9609篇
  1979年   20090篇
  1978年   13289篇
  1977年   11680篇
  1976年   10114篇
  1975年   12059篇
  1974年   14228篇
  1973年   13534篇
  1972年   13048篇
  1971年   12424篇
  1970年   11455篇
  1969年   11048篇
  1968年   9845篇
  1967年   8954篇
排序方式: 共有10000条查询结果,搜索用时 62 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