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   2700459篇
  免费   195308篇
  国内免费   5885篇
耳鼻咽喉   37905篇
儿科学   87205篇
妇产科学   76277篇
基础医学   382021篇
口腔科学   80080篇
临床医学   238530篇
内科学   523937篇
皮肤病学   61324篇
神经病学   211695篇
特种医学   103709篇
外国民族医学   659篇
外科学   412333篇
综合类   63141篇
现状与发展   10篇
一般理论   929篇
预防医学   197042篇
眼科学   65605篇
药学   200442篇
  11篇
中国医学   6470篇
肿瘤学   152327篇
  2018年   28451篇
  2017年   21922篇
  2016年   24292篇
  2015年   27518篇
  2014年   38498篇
  2013年   57215篇
  2012年   77583篇
  2011年   81889篇
  2010年   48672篇
  2009年   45893篇
  2008年   76730篇
  2007年   82708篇
  2006年   83235篇
  2005年   80053篇
  2004年   77601篇
  2003年   74269篇
  2002年   72205篇
  2001年   131726篇
  2000年   134908篇
  1999年   112856篇
  1998年   30581篇
  1997年   27313篇
  1996年   26768篇
  1995年   25550篇
  1994年   23571篇
  1993年   21948篇
  1992年   86587篇
  1991年   84156篇
  1990年   81620篇
  1989年   78975篇
  1988年   72577篇
  1987年   71360篇
  1986年   67737篇
  1985年   64385篇
  1984年   48003篇
  1983年   40927篇
  1982年   23856篇
  1981年   21544篇
  1979年   44513篇
  1978年   31317篇
  1977年   26890篇
  1976年   24663篇
  1975年   27202篇
  1974年   32602篇
  1973年   31649篇
  1972年   29857篇
  1971年   27824篇
  1970年   26114篇
  1969年   24745篇
  1968年   23261篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
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   
2.
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   
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.
Die Anaesthesiologie - Auch wenn für Anästhesiologen über Jahrzehnte die Prophylaxe und Therapie postoperativer Schmerzen im Rahmen des postoperativen Patientenkomforts an vorderster...  相似文献   
5.
6.
7.
8.
9.
10.
PurposeUnderstanding the value of genetic screening and testing for monogenic disorders requires high-quality, methodologically robust economic evaluations. This systematic review sought to assess the methodological quality among such studies and examined opportunities for improvement.MethodsWe searched PubMed, Cochrane, Embase, and Web of Science for economic evaluations of genetic screening/testing (2013-2019). Methodological rigor and adherence to best practices were systematically assessed using the British Medical Journal checklist.ResultsAcross the 47 identified studies, there were substantial variations in modeling approaches, reporting detail, and sophistication. Models ranged from simple decision trees to individual-level microsimulations that compared between 2 and >20 alternative interventions. Many studies failed to report sufficient detail to enable replication or did not justify modeling assumptions, especially for costing methods and utility values. Meta-analyses, systematic reviews, or calibration were rarely used to derive parameter estimates. Nearly all studies conducted some sensitivity analysis, and more sophisticated studies implemented probabilistic sensitivity/uncertainty analysis, threshold analysis, and value of information analysis.ConclusionWe describe a heterogeneous body of work and present recommendations and exemplar studies across the methodological domains of (1) perspective, scope, and parameter selection; (2) use of uncertainty/sensitivity analyses; and (3) reporting transparency for improvement in the economic evaluation of genetic screening/testing.  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