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   1547925篇
  免费   121964篇
  国内免费   3748篇
耳鼻咽喉   20317篇
儿科学   50933篇
妇产科学   45161篇
基础医学   219579篇
口腔科学   41786篇
临床医学   135547篇
内科学   315390篇
皮肤病学   37847篇
神经病学   128373篇
特种医学   57001篇
外国民族医学   493篇
外科学   227991篇
综合类   33502篇
现状与发展   3篇
一般理论   520篇
预防医学   124974篇
眼科学   34330篇
药学   108803篇
  1篇
中国医学   3771篇
肿瘤学   87315篇
  2021年   14056篇
  2019年   14751篇
  2018年   20726篇
  2017年   15306篇
  2016年   16919篇
  2015年   18912篇
  2014年   26437篇
  2013年   39055篇
  2012年   53973篇
  2011年   56729篇
  2010年   33085篇
  2009年   31295篇
  2008年   51501篇
  2007年   54383篇
  2006年   54741篇
  2005年   53112篇
  2004年   50531篇
  2003年   47978篇
  2002年   46250篇
  2001年   76561篇
  2000年   78181篇
  1999年   64646篇
  1998年   17984篇
  1997年   16169篇
  1996年   16260篇
  1995年   15366篇
  1994年   13871篇
  1993年   13029篇
  1992年   47514篇
  1991年   45098篇
  1990年   43045篇
  1989年   40916篇
  1988年   37474篇
  1987年   36642篇
  1986年   34095篇
  1985年   32462篇
  1984年   24712篇
  1983年   20788篇
  1982年   12657篇
  1981年   11163篇
  1979年   21599篇
  1978年   15172篇
  1977年   12567篇
  1976年   11871篇
  1975年   12223篇
  1974年   14783篇
  1973年   14322篇
  1972年   13334篇
  1971年   12108篇
  1970年   11606篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
Introduction: The treatment of classical Hodgkin lymphoma (cHL) in children is a story of success. Nowadays, more than 90% of patients are cured and overall survival is nearly 100% at 5 years. Efforts have been made to avoid related effects of therapies; therefore, children are treated using different chemotherapy schemes in comparison with adults.

Areas covered: This review includes a view of the clinical classification and risk assessment in children suffering from HL. The chemotherapy more commonly employed is revisited. The use of PET/CT to evaluate the disease in order to guide therapy is analyzed. New options of chemotherapy and emerging immunotherapy are also included.

Expert opinion: In order to make the right treatment choice, a proper initial assessment of risk is mandatory. The choice of therapy in these kinds of patients must be done according to the experience of the team, and also, the cost and logistics related to the eligible scheme are very important. If possible, efforts must be made to include PET/CT in guiding therapy and avoiding overtreatment and long-term adverse effects in children. New options in immunotherapy are emerging and must be considered with caution in selected patients.  相似文献   

33.

Purpose

Endovascular treatment with mechanical thrombectomy devices demonstrated high recanalization rates but functional outcome did not correlate with high rates of recanalization obtained. Patient selection prior to the endovascular treatment is very important in the final outcome of the patient. The primary aim of our study was to evaluate the prognostic value of posterior circulation Alberta Stroke Program Early CT Score (pc-ASPECTS) and Pons-Midbrain Index (PMI) scores in patients with Basilar Artery Occlusion (BAO) treated with successful angiographic recanalization after mechanical thrombectomy.

Methods

Retrospective single-center study including 18 patients between 2008 and 2013 who had acute basilar artery occlusion managed with endovascular treatment within 24 hours from symptoms onset and with successful angiographic recanalization. The patients were initially classified into two groups according to clinical outcome and mortality at 90 days. For analysis we also divided patients into groups based on pc-ASPECTS (≥8vs.< 8) and PMI (≥3vs.< 3) on non-contrast CT (NCCT) and CT Angiography Source Images (CTASI). Imaging data were correlated to clinical outcome and mortality rate.

Results

CTASI pc-ASPECTS, dichotomized at < 8 versus≥8, was associated with a favorable outcome (RR: 2.6; 95% CI: 1.3-5.2) and a reduced risk of death (RR: 6.5: 95% CI: 7.8-23.3). All patients that survived and were functionally independent had pc-ASPECTS score≥8. None of the 5 patients with CTASI pc-ASPECTS score less than 8 survived.

Conclusion

PC-ASPECTS on CTASI is helpful for predicting functional outcome after BAO recanalization with endovascular treatment. These results should be validated in a randomized controlled trial in order to decide whether or not to treat a patient with BAO.  相似文献   
34.
35.
36.
37.
Metabolism describes the series of chemical reactions that are concerned with the provision of energy to biological systems. They may be divided into reactions involved in energy yield (catabolism: demand exceeds supply), and energy storage (anabolism: supply exceeds demand). Regulation of these pathways is critical for homeostasis, and derangements in metabolism are seen in a wide variety of pathological processes. Understanding metabolism is key to the treatment of many diseases, notably diabetes, as well as underpinning clinical nutritional support.  相似文献   
38.
39.
40.
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