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   1054篇
  免费   126篇
  国内免费   1篇
耳鼻咽喉   33篇
儿科学   36篇
妇产科学   4篇
基础医学   130篇
口腔科学   33篇
临床医学   63篇
内科学   250篇
皮肤病学   18篇
神经病学   83篇
特种医学   31篇
外科学   210篇
综合类   20篇
一般理论   1篇
预防医学   100篇
眼科学   4篇
药学   48篇
中国医学   1篇
肿瘤学   116篇
  2019年   11篇
  2018年   9篇
  2016年   14篇
  2015年   18篇
  2014年   18篇
  2013年   20篇
  2012年   50篇
  2011年   36篇
  2010年   20篇
  2009年   12篇
  2008年   29篇
  2007年   32篇
  2006年   45篇
  2005年   32篇
  2004年   35篇
  2003年   40篇
  2002年   22篇
  2001年   32篇
  2000年   21篇
  1999年   22篇
  1997年   11篇
  1995年   12篇
  1994年   9篇
  1993年   10篇
  1992年   21篇
  1991年   22篇
  1990年   31篇
  1989年   16篇
  1988年   17篇
  1987年   18篇
  1986年   27篇
  1985年   28篇
  1984年   26篇
  1983年   18篇
  1982年   13篇
  1981年   14篇
  1980年   9篇
  1979年   18篇
  1978年   16篇
  1977年   13篇
  1976年   16篇
  1975年   19篇
  1974年   19篇
  1973年   16篇
  1971年   18篇
  1970年   29篇
  1969年   9篇
  1968年   20篇
  1967年   25篇
  1966年   23篇
排序方式: 共有1181条查询结果,搜索用时 0 毫秒
51.
Between 1966 and 1982, 46 patients with previously untreated malignant tumors of major salivary gland origin received combined surgery and postoperative radiotherapy. They were compared with 46 patients treated with surgery only between 1939 and 1965, who were matched according to prognostic criteria. Radiation doses ranged from 4000 to 7740 cGy (median, 5664 cGy). The 5-year determinate survival rates for patients given combined therapy with stage I and II disease vs patients given surgery only was 81.9% vs 95.8%, while for stages III and IV it was 51.2% vs 9.5%, respectively. Local control for stage III and IV disease in patients given combined therapy vs patients given surgery only at 5 years was 51.3% vs 16.8%. For patients with nodal metastases, 5-year determinate survival for the combined-therapy group vs the surgery-only group was 48.9% vs 18.7%, and the corresponding local-regional control was 69.1% vs 40.2%. The results of this analysis suggest that postoperative radiotherapy significantly improves outcome for patients with stage III and IV disease and for patients with lymph node metastases.  相似文献   
52.
53.
54.
OBJECTIVE: To evaluate economic and health implications of tinzaparin sodium, a once a day low-molecular-weight heparin (LMWH), versus unfractionated heparin (UFH) in the treatment of acute deep vein thrombosis (DVT) from a US healthcare payer perspective. STUDY DESIGN: An economic model, composed of two submodules, was created: A short-term module based on clinical trial data covering the first 3 months and a long-term module that projects trial results based on published data for up to 50 years. METHODS: Clinical trial results were combined with data from long-term follow-up studies of DVT in a model that estimates the health and economic consequences of treatment. Both short- and long-term costs with tinzaparin sodium were compared with UFH, as were health outcomes and quality-adjusted life-years (QALYs). RESULTS: Patients treated with tinzaparin sodium are estimated to live a mean of 0.9 years longer on average (0.6 discounted), resulting in an increase of 0.8 QALYs (0.5 discounted). At the same time, lifetime savings are US dollars 621 per patient (1999 values), even when all patients receiving tinzapirin sodium are treated as inpatients. Early discharge of patients receiving tinzaparin sodium, or outpatient treatment, would save between US dollars 3000 and US dollars 5000 per patient. CONCLUSION: Tinzaparin sodium leads to better health outcomes and substantial economic savings compared with UFH treatment when all management costs are considered.  相似文献   
55.
This study followed 345 Israeli youngsters who had been residents of two shelters for runaway and homeless youths, 6-12 weeks after their departure. Telephone interviews were conducted with the youngsters, their parents, and social workers in the community. A majority of the youngsters had either returned to their family homes, or had been placed out of home. Their residential stability was found to be low. Post-shelter place of residence was related to length of stay at the shelter, amount of contact with their family while at the shelter, and manner of departure. Our findings lead to a typology of shelter uses, and also raise questions about the extent to which shelters achieve their declared goals.  相似文献   
56.
OBJECTIVE: We have recently demonstrated that fibrin induces a specific, dose- and time-dependent upregulation of the angiogenic factor interleukin 8 (IL-8) from human oral squamous cell carcinoma (OSCC) cells in vitro. In this study we begin to test the hypothesis that fibrin induces IL-8 expression from tumor cells in vivo by studying their in vivo association in OSCC. STUDY DESIGN: The presence of fibrin(ogen) was initially evaluated in 20 archival human OSCCs by means of immunohistochemistry with a polyclonal antibody. The presence of fibrin and IL-8 was then studied in 19 sections from 8 different patients' head and neck tumors (including 6 OSCCs) by means of immunohistochemistry with a monoclonal antibody against fibrin. These 8 tumors had been treated with inhibitors of new fibrin formation and degradation immediately after surgical removal. RESULTS: Fibrin staining was found in 100% of the tumor sections tested. IL-8 staining was found in the cytoplasm of tumor cells in 100% of the studied tumors, including areas adjacent to fibrin. CONCLUSIONS: These data demonstrate an in vivo association between fibrin and IL-8 in OSCC. These studies support our hypothesis that fibrin induces expression of protumorigenic factors such as IL-8 from tumor cells in vivo.  相似文献   
57.
58.
An effective transition of the psychiatric patient from the hospital to the community clinic is vital to the continuity of care. This study shows a short-term group, the "re-entry group," to be more effective in this transition than are patients discharged from a psychiatric hospital by the traditional process. We used a psychoeducational approach to facilitate active participation and compliance with outpatient therapy. Outcome variables included absorption of patients into the clinic, continued therapy, compliance with treatment, rehospitalization, level of knowledge regarding illness and medication, quality of rehabilitation, and attitude towards treatment.  相似文献   
59.
60.
A case of unilateral cerebellar hypoplasia is presented. This was an incidental finding in a patient with no evidence of neuromuscular or metabolic disease and no past history of trauma, anoxia, or perinatal difficulties. Computed tomographic scans showed posterior fossa asymmetry with underlying unilateral cerebellar hemisphere hypoplasia. In addition, there was overlying skull table thickening and excess petrous pneumatization on the affected side.  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