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   2695834篇
  免费   195241篇
  国内免费   5939篇
耳鼻咽喉   37771篇
儿科学   86839篇
妇产科学   76198篇
基础医学   382150篇
口腔科学   80029篇
临床医学   238222篇
内科学   522416篇
皮肤病学   61267篇
神经病学   211608篇
特种医学   103544篇
外国民族医学   659篇
外科学   411658篇
综合类   63118篇
现状与发展   10篇
一般理论   931篇
预防医学   196767篇
眼科学   65184篇
药学   199930篇
  10篇
中国医学   6471篇
肿瘤学   152232篇
  2018年   28243篇
  2017年   21792篇
  2016年   24170篇
  2015年   27451篇
  2014年   38295篇
  2013年   56928篇
  2012年   77232篇
  2011年   81625篇
  2010年   48504篇
  2009年   45816篇
  2008年   76560篇
  2007年   82524篇
  2006年   83135篇
  2005年   79961篇
  2004年   77516篇
  2003年   74225篇
  2002年   72194篇
  2001年   131709篇
  2000年   134846篇
  1999年   112827篇
  1998年   30561篇
  1997年   27297篇
  1996年   26749篇
  1995年   25553篇
  1994年   23559篇
  1993年   21932篇
  1992年   86536篇
  1991年   84100篇
  1990年   81569篇
  1989年   78935篇
  1988年   72545篇
  1987年   71329篇
  1986年   67725篇
  1985年   64350篇
  1984年   47979篇
  1983年   40884篇
  1982年   23839篇
  1981年   21542篇
  1979年   44488篇
  1978年   31308篇
  1977年   26886篇
  1976年   24667篇
  1975年   27202篇
  1974年   32580篇
  1973年   31619篇
  1972年   29829篇
  1971年   27806篇
  1970年   26103篇
  1969年   24737篇
  1968年   23249篇
排序方式: 共有10000条查询结果,搜索用时 15 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