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   2430303篇
  免费   180954篇
  国内免费   5396篇
耳鼻咽喉   32101篇
儿科学   81247篇
妇产科学   67174篇
基础医学   348046篇
口腔科学   70811篇
临床医学   219671篇
内科学   471545篇
皮肤病学   55232篇
神经病学   190494篇
特种医学   92175篇
外国民族医学   526篇
外科学   367099篇
综合类   56847篇
现状与发展   4篇
一般理论   870篇
预防医学   184654篇
眼科学   57585篇
药学   177388篇
  9篇
中国医学   5815篇
肿瘤学   137360篇
  2019年   18892篇
  2018年   27430篇
  2017年   20898篇
  2016年   23147篇
  2015年   26316篇
  2014年   36476篇
  2013年   54189篇
  2012年   73786篇
  2011年   78157篇
  2010年   46361篇
  2009年   43384篇
  2008年   72706篇
  2007年   77411篇
  2006年   78050篇
  2005年   74784篇
  2004年   72544篇
  2003年   69071篇
  2002年   66692篇
  2001年   122141篇
  2000年   125077篇
  1999年   104044篇
  1998年   27966篇
  1997年   24704篇
  1996年   24720篇
  1995年   23723篇
  1994年   21834篇
  1993年   20276篇
  1992年   80092篇
  1991年   77647篇
  1990年   75234篇
  1989年   72468篇
  1988年   65856篇
  1987年   64960篇
  1986年   61082篇
  1985年   58268篇
  1984年   43070篇
  1983年   36527篇
  1982年   21075篇
  1981年   18864篇
  1979年   38598篇
  1978年   27149篇
  1977年   23129篇
  1976年   21597篇
  1975年   22712篇
  1974年   27553篇
  1973年   26499篇
  1972年   24521篇
  1971年   22706篇
  1970年   21118篇
  1969年   19767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.

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.
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   
4.
5.
6.
7.
8.
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   
9.
10.
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