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   3236791篇
  免费   257124篇
  国内免费   7510篇
耳鼻咽喉   46010篇
儿科学   102333篇
妇产科学   87641篇
基础医学   461928篇
口腔科学   93821篇
临床医学   304940篇
内科学   620679篇
皮肤病学   65841篇
神经病学   272763篇
特种医学   126577篇
外国民族医学   1128篇
外科学   475139篇
综合类   76394篇
现状与发展   2篇
一般理论   1388篇
预防医学   269696篇
眼科学   75615篇
药学   242651篇
  10篇
中国医学   6392篇
肿瘤学   170477篇
  2018年   35611篇
  2017年   27299篇
  2016年   29989篇
  2015年   33839篇
  2014年   47846篇
  2013年   73941篇
  2012年   100262篇
  2011年   106266篇
  2010年   62145篇
  2009年   58378篇
  2008年   99690篇
  2007年   105979篇
  2006年   106495篇
  2005年   103404篇
  2004年   99074篇
  2003年   95381篇
  2002年   93390篇
  2001年   145462篇
  2000年   150474篇
  1999年   126330篇
  1998年   35266篇
  1997年   31612篇
  1996年   31051篇
  1995年   32033篇
  1994年   30149篇
  1993年   28162篇
  1992年   102195篇
  1991年   99393篇
  1990年   96243篇
  1989年   92333篇
  1988年   85738篇
  1987年   84341篇
  1986年   80241篇
  1985年   76750篇
  1984年   58328篇
  1983年   49713篇
  1982年   30268篇
  1981年   26905篇
  1979年   54350篇
  1978年   38424篇
  1977年   32110篇
  1976年   30617篇
  1975年   32105篇
  1974年   39444篇
  1973年   38009篇
  1972年   35380篇
  1971年   32837篇
  1970年   30699篇
  1969年   28424篇
  1968年   26307篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
The International Journal of Cardiovascular Imaging - Global longitudinal strain (GLS) has proven to be a powerful prognostic marker in various patient populations, but the prognostic value of...  相似文献   
2.
3.
4.
5.
6.
7.
8.
The Earth’s mean surface temperature is already approximately 1.1°C higher than pre-industrial levels. Exceeding a mean 1.5°C rise by 2050 will make global adaptation to the consequences of climate change less possible. To protect public health, anaesthesia providers need to reduce the contribution their practice makes to global warming. We convened a Working Group of 45 anaesthesia providers with a recognised interest in sustainability, and used a three-stage modified Delphi consensus process to agree on principles of environmentally sustainable anaesthesia that are achievable worldwide. The Working Group agreed on the following three important underlying statements: patient safety should not be compromised by sustainable anaesthetic practices; high-, middle- and low-income countries should support each other appropriately in delivering sustainable healthcare (including anaesthesia); and healthcare systems should be mandated to reduce their contribution to global warming. We set out seven fundamental principles to guide anaesthesia providers in the move to environmentally sustainable practice, including: choice of medications and equipment; minimising waste and overuse of resources; and addressing environmental sustainability in anaesthetists’ education, research, quality improvement and local healthcare leadership activities. These changes are achievable with minimal material resource and financial investment, and should undergo re-evaluation and updates as better evidence is published. This paper discusses each principle individually, and directs readers towards further important references.  相似文献   
9.
Kinase alterations are increasingly recognised as oncogenic drivers in mesenchymal tumours. Infantile fibrosarcoma and the related renal tumour, congenital mesoblastic nephroma, were among the first solid tumours shown to harbour recurrent tyrosine kinase fusions, with the canonical ETV6::NTRK3 fusion identified more than 20 years ago. Although targeted testing has long been used in diagnosis, the advent of more robust sequencing techniques has driven the discovery of kinase alterations in an array of mesenchymal tumours. As our ability to identify these genetic alterations has improved, as has our recognition and understanding of the tumours that harbour these alterations. Specifically, this study will focus upon mesenchymal tumours harbouring NTRK or other kinase alterations, including tumours with an infantile fibrosarcoma-like appearance, spindle cell tumours resembling lipofibromatosis or peripheral nerve sheath tumours and those occurring in adults with a fibrosarcoma-like appearance. As publications describing the histology of these tumours increase so, too, do the variety kinase alterations reported, now including NTRK1/2/3, RET, MET, RAF1, BRAF, ALK, EGFR and ABL1 fusions or alterations. To date, these tumours appear locally aggressive and rarely metastatic, without a clear link between traditional features used in histological grading (e.g. mitotic activity, necrosis) and outcome. However, most of these tumours are amenable to new targeted therapies, making their recognition of both diagnostic and therapeutic import. The goal of this study is to review the clinicopathological features of tumours with NTRK and other tyrosine kinase alterations, discuss the most common differential diagnoses and provide recommendations for molecular confirmation with associated treatment implications.  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