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   130090篇
  免费   5880篇
  国内免费   362篇
耳鼻咽喉   2012篇
儿科学   4163篇
妇产科学   2822篇
基础医学   17575篇
口腔科学   4395篇
临床医学   8061篇
内科学   32392篇
皮肤病学   4216篇
神经病学   10090篇
特种医学   3310篇
外国民族医学   1篇
外科学   16017篇
综合类   716篇
一般理论   36篇
预防医学   12584篇
眼科学   2873篇
药学   8847篇
  2篇
中国医学   621篇
肿瘤学   5599篇
  2023年   802篇
  2022年   629篇
  2021年   2746篇
  2020年   1390篇
  2019年   3034篇
  2018年   4996篇
  2017年   2909篇
  2016年   2694篇
  2015年   3020篇
  2014年   3548篇
  2013年   5289篇
  2012年   9218篇
  2011年   9838篇
  2010年   5009篇
  2009年   3596篇
  2008年   7887篇
  2007年   8466篇
  2006年   7804篇
  2005年   7740篇
  2004年   6816篇
  2003年   6408篇
  2002年   6033篇
  2001年   3885篇
  2000年   4486篇
  1999年   3366篇
  1998年   666篇
  1997年   496篇
  1996年   464篇
  1995年   374篇
  1994年   316篇
  1993年   285篇
  1992年   1296篇
  1991年   1091篇
  1990年   970篇
  1989年   821篇
  1988年   682篇
  1987年   663篇
  1986年   671篇
  1985年   571篇
  1984年   418篇
  1983年   312篇
  1979年   335篇
  1975年   282篇
  1974年   315篇
  1973年   349篇
  1972年   288篇
  1971年   313篇
  1970年   291篇
  1969年   292篇
  1968年   269篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
142.
143.
Hepatic encephalopathy is a reversible state of altered cognition that may occur in patients with acute or chronic liver disease or porto-systemic shunt, and in which known neurological or psychiatric signs may develop. Nitrogenated substances from intestinal digestion reach the brain without being cleared by their passage through the liver due to the presence of porto-systemic shunt. We report two cases of patients with porto-systemic shunt diagnosed with recurrent chronic hepatic encephalopathy refractory to conventional medical treatment. They were satisfactorily treated with shunt embolization using interventionist radiology techniques.  相似文献   
144.
Five patients with idiopathic transient osteoporosis were examined. Bone scanning and MRI was helpful in the diagnosis to differentiate of necrosis and all patients recovered completely with conservative and symptomatic treatment. There was no history of trauma in all patients. MRI was realized previously in all cases to confirm the diagnosis and after the resolution of symptomathology.  相似文献   
145.
146.
147.
Background and objectiveTo analyse frequency, characteristics and patient survival with lung cancer (LC) and Common Obstructive Pulmonary Disease (COPD), comparing them with patients that do not have COPD.Material and methodsA retrospective study, of patients diagnosed by means of cytohistology. Survival was estimated by the Kaplan-Meier method. Statistical analysis was carried out using SPSS 15.0.ResultsA total of 996 patients were diagnosed, 39.8% with COPD. Mean age70±9.19 years. GOLD stages: I 18.2%, II 53.6%, III 24%, IV 4.2%. The histological types: squamous cell carcinoma 48.2%, adenocarcinoma 22%, and small cell carcinoma 22.5%. Survival was longer in the COPD group.ConclusionsLC and COPD are combined in 39.8%. Squamous cell type is more frequent and survival was longer in the COPD group.  相似文献   
148.
Background and ObjectiveSchool smoking prevention programs have never yielded the expected results. The aim of this study was to analyze the efficacy of an intensive smoking prevention program created by the educational community in which it was to be applied.Population and MethodA 3-year smoking prevention program was carried out among the students of Fuentesaúco Secondary School in Zamora, Spain. The Babilafuente Secondary School in Salamanca, Spain was the control group. The program included both prevention and treatment activities. The former were carried out in the school, in out-of-school situations, and in the community. The questionnaire of the European Smoking Prevention Framework Approach was used.ResultsA total of 417 students aged 12 to 17 years participated in the study. Of these, 54.4% belonged to the intervention group and 45.6% to the control group. Smokers represented 36.7% of the population. After the intervention smokers represented 40.1% of the Fuentesaúco students compared with 46.1% of the Babilafuente students, though the difference was not statistically significant. With respect to the cognitive determinants of smoking behavior, after the intervention significant differences in favor of the intervention group were only observed in the subjects’ perception of the behavior of their siblings, peers, and teachers.ConclusionsThe use of smoking prevention programs in schools should be reconsidered, and their evaluation should be based on educational rather than clinical criteria. Proposed changes in the program include decreasing its intensity, starting with students of an earlier age and seeking greater involvement of parents.  相似文献   
149.
150.
ObjectiveTo assess whether the release of the new consensus algorithms in August 2006, along with the consensus recommendation of also using metformin as first choice in patients with normal weight, has led to an increase in the use of this drug in the period immediately after.DesignRetrospective longitudinal Study.SitesSantiago de Compostela Health District (A Coruña).ParticipantsUsers of the Galician health service in the Santiago de Compostela Health District.MethodsThe evolution of the monthly number of DHD (Daily Defined Doses/1000 inhabitants/day) of metformin from early 2003 until 12 months after the issuing of new algorithms was analysed graphically and using a multiple regression model.ResultsThe graphical representation of the DHD of metformin over time shows a linear growth for the period, but there is an increasing trend after the publication of the new consensus algorithm. The multiple regression showed that the increase is statistically significant.ConclusionsFollowing the publication of the new consensus algorithm an increasing trend in the use of metformin is observed in the short term.  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