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   2719625篇
  免费   197250篇
  国内免费   5885篇
耳鼻咽喉   38151篇
儿科学   87395篇
妇产科学   76882篇
基础医学   385339篇
口腔科学   80708篇
临床医学   241701篇
内科学   526342篇
皮肤病学   61537篇
神经病学   213493篇
特种医学   104559篇
外国民族医学   660篇
外科学   414171篇
综合类   63438篇
现状与发展   10篇
一般理论   940篇
预防医学   200272篇
眼科学   65735篇
药学   201813篇
  13篇
中国医学   6467篇
肿瘤学   153134篇
  2018年   28511篇
  2017年   22042篇
  2016年   24394篇
  2015年   27642篇
  2014年   38607篇
  2013年   57533篇
  2012年   78127篇
  2011年   82566篇
  2010年   48948篇
  2009年   46128篇
  2008年   77361篇
  2007年   83404篇
  2006年   83998篇
  2005年   80820篇
  2004年   78316篇
  2003年   74968篇
  2002年   73007篇
  2001年   132353篇
  2000年   135588篇
  1999年   113429篇
  1998年   30918篇
  1997年   27541篇
  1996年   27034篇
  1995年   25800篇
  1994年   23769篇
  1993年   22164篇
  1992年   87156篇
  1991年   84701篇
  1990年   82174篇
  1989年   79475篇
  1988年   73040篇
  1987年   71854篇
  1986年   68201篇
  1985年   64825篇
  1984年   48352篇
  1983年   41234篇
  1982年   24121篇
  1981年   21767篇
  1979年   44830篇
  1978年   31587篇
  1977年   27112篇
  1976年   24900篇
  1975年   27429篇
  1974年   32838篇
  1973年   31859篇
  1972年   30094篇
  1971年   28046篇
  1970年   26307篇
  1969年   24927篇
  1968年   23398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