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   2463683篇
  免费   183333篇
  国内免费   5534篇
耳鼻咽喉   32518篇
儿科学   81987篇
妇产科学   67813篇
基础医学   352547篇
口腔科学   71117篇
临床医学   223253篇
内科学   478582篇
皮肤病学   56048篇
神经病学   193755篇
特种医学   93624篇
外国民族医学   528篇
外科学   373252篇
综合类   57206篇
现状与发展   4篇
一般理论   943篇
预防医学   186384篇
眼科学   58284篇
药学   179247篇
  9篇
中国医学   5841篇
肿瘤学   139608篇
  2021年   19049篇
  2019年   19757篇
  2018年   28409篇
  2017年   21567篇
  2016年   23952篇
  2015年   27249篇
  2014年   37682篇
  2013年   55689篇
  2012年   76186篇
  2011年   80471篇
  2010年   47725篇
  2009年   44609篇
  2008年   74569篇
  2007年   79348篇
  2006年   79888篇
  2005年   76475篇
  2004年   74159篇
  2003年   70540篇
  2002年   68021篇
  2001年   122415篇
  2000年   125342篇
  1999年   104336篇
  1998年   28265篇
  1997年   24940篇
  1996年   24899篇
  1995年   23893篇
  1994年   21983篇
  1993年   20419篇
  1992年   80290篇
  1991年   77829篇
  1990年   75414篇
  1989年   72624篇
  1988年   66011篇
  1987年   65122篇
  1986年   61226篇
  1985年   58431篇
  1984年   43212篇
  1983年   36656篇
  1982年   21184篇
  1979年   38714篇
  1978年   27257篇
  1977年   23231篇
  1976年   21687篇
  1975年   22796篇
  1974年   27654篇
  1973年   26585篇
  1972年   24600篇
  1971年   22787篇
  1970年   21184篇
  1969年   19824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.
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.
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   
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