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   1107675篇
  免费   82638篇
  国内免费   2709篇
耳鼻咽喉   14885篇
儿科学   38317篇
妇产科学   31135篇
基础医学   162119篇
口腔科学   31556篇
临床医学   99706篇
内科学   213373篇
皮肤病学   26135篇
神经病学   90726篇
特种医学   43248篇
外国民族医学   305篇
外科学   166154篇
综合类   24213篇
一般理论   419篇
预防医学   84096篇
眼科学   25059篇
药学   79685篇
  3篇
中国医学   2206篇
肿瘤学   59682篇
  2019年   8466篇
  2018年   13030篇
  2017年   10320篇
  2016年   12096篇
  2015年   12893篇
  2014年   16973篇
  2013年   26631篇
  2012年   34902篇
  2011年   37587篇
  2010年   22224篇
  2009年   19908篇
  2008年   35551篇
  2007年   37621篇
  2006年   37807篇
  2005年   36369篇
  2004年   35299篇
  2003年   34186篇
  2002年   33087篇
  2001年   50637篇
  2000年   52777篇
  1999年   42914篇
  1998年   12305篇
  1997年   11001篇
  1996年   10896篇
  1995年   10367篇
  1994年   9670篇
  1993年   9023篇
  1992年   32797篇
  1991年   31937篇
  1990年   31467篇
  1989年   30350篇
  1988年   27566篇
  1987年   27784篇
  1986年   25814篇
  1985年   25151篇
  1984年   18922篇
  1983年   15964篇
  1982年   9775篇
  1981年   8846篇
  1979年   17255篇
  1978年   12576篇
  1977年   10721篇
  1976年   10102篇
  1975年   10529篇
  1974年   12648篇
  1973年   12133篇
  1972年   11111篇
  1971年   10374篇
  1970年   9605篇
  1969年   8932篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
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   
2.
3.

Interstitial lung disease (ILD) represents a significant cause of morbidity and mortality in systemic sclerosis (SSc). The purpose of this study was to examine recirculating lymphocytes from SSc patients for potential biomarkers of interstitial lung disease (ILD). Peripheral blood mononuclear cells (PBMCs) were isolated from patients with SSc and healthy controls enrolled in the Vanderbilt University Myositis and Scleroderma Treatment Initiative Center cohort between 9/2017–6/2019. Clinical phenotyping was performed by chart abstraction. Immunophenotyping was performed using both mass cytometry and fluorescence cytometry combined with t-distributed stochastic neighbor embedding analysis and traditional biaxial gating. This study included 34 patients with SSc-ILD, 14 patients without SSc-ILD, and 25 healthy controls. CD21lo/neg cells are significantly increased in SSc-ILD but not in SSc without ILD (15.4 ± 13.3% vs. 5.8 ± 0.9%, p = 0.002) or healthy controls (5.0 ± 0.5%, p < 0.0001). While CD21lo/neg B cells can be identified from a single biaxial gate, tSNE analysis reveals that the biaxial gate is comprised of multiple distinct subsets, all of which are increased in SSc-ILD. CD21lo/neg cells in both healthy controls and SSc-ILD are predominantly tBET positive and do not have intracellular CD21. Immunohistochemistry staining demonstrated that CD21lo/neg B cells diffusely infiltrate the lung parenchyma of an SSc-ILD patient. Additional work is needed to validate this biomarker in larger cohorts and longitudinal studies and to understand the role of these cells in SSc-ILD.

  相似文献   
4.
5.
6.
7.
8.
9.
Cognitive Therapy and Research - Despite interest in psychological inflexibility as a marker of suicide risk, no measure of psychological inflexibility specific to SI exists. The present study...  相似文献   
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