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   1055946篇
  免费   81131篇
  国内免费   2721篇
耳鼻咽喉   13609篇
儿科学   36693篇
妇产科学   30134篇
基础医学   153027篇
口腔科学   28601篇
临床医学   98015篇
内科学   204066篇
皮肤病学   24109篇
神经病学   84964篇
特种医学   39856篇
外国民族医学   305篇
外科学   155858篇
综合类   24520篇
现状与发展   1篇
一般理论   475篇
预防医学   85776篇
眼科学   23595篇
药学   76060篇
  3篇
中国医学   2103篇
肿瘤学   58028篇
  2021年   8679篇
  2019年   9108篇
  2018年   12505篇
  2017年   9782篇
  2016年   11006篇
  2015年   12282篇
  2014年   16790篇
  2013年   25221篇
  2012年   33626篇
  2011年   35454篇
  2010年   21087篇
  2009年   19574篇
  2008年   32616篇
  2007年   34222篇
  2006年   34546篇
  2005年   32912篇
  2004年   31800篇
  2003年   30275篇
  2002年   29064篇
  2001年   47592篇
  2000年   48668篇
  1999年   40865篇
  1998年   11661篇
  1997年   10449篇
  1996年   10490篇
  1995年   10083篇
  1994年   9333篇
  1993年   8748篇
  1992年   32635篇
  1991年   31817篇
  1990年   31372篇
  1989年   30275篇
  1988年   27541篇
  1987年   27618篇
  1986年   25728篇
  1985年   24908篇
  1984年   18644篇
  1983年   15717篇
  1982年   9429篇
  1979年   17032篇
  1978年   12379篇
  1977年   10506篇
  1976年   9900篇
  1975年   10333篇
  1974年   12455篇
  1973年   12013篇
  1972年   11025篇
  1971年   10254篇
  1970年   9501篇
  1969年   8846篇
排序方式: 共有10000条查询结果,搜索用时 0 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.

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   
3.
4.
5.
ABSTRACT

The lack of stable housing can impair access and continuity of care for patients living with human immunodeficiency virus (HIV). This study investigated the relationship between housing status assessed at multiple time points and several core HIV-related outcomes within the same group of HIV patients experiencing homelessness. Patients with consistently stable housing (CSH) during the year were compared to patients who lacked CSH (non-CSH group). The study outcomes included HIV viral load (VL), CD4 counts, and health care utilization. Multivariable and propensity weighted analyses were used to assess outcomes adjusting for potential group differences. Of 208 patients, 88 (42%) had CSH and 120 (58%) were non-CSH. Patients with CSH had significantly higher proportion of VL suppression and higher mean CD4 counts. The frequency of nurse visits in the CSH group was less than a half of that in the non-CSH group. Patients with CSH were less likely to be admitted to the medical respite facility, and if admitted, their length of stay was about a half of that for the non-CSH group. Our study findings show that patients with CSH had significantly better HIV virologic control and immune status as well as improved health care utilization.  相似文献   
6.
7.
8.
9.
10.
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   
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