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   6640篇
  免费   294篇
  国内免费   51篇
耳鼻咽喉   135篇
儿科学   132篇
妇产科学   282篇
基础医学   855篇
口腔科学   54篇
临床医学   637篇
内科学   1943篇
皮肤病学   65篇
神经病学   624篇
特种医学   115篇
外科学   779篇
综合类   49篇
一般理论   1篇
预防医学   273篇
眼科学   142篇
药学   519篇
中国医学   12篇
肿瘤学   368篇
  2023年   35篇
  2022年   176篇
  2021年   303篇
  2020年   95篇
  2019年   140篇
  2018年   153篇
  2017年   105篇
  2016年   124篇
  2015年   148篇
  2014年   238篇
  2013年   278篇
  2012年   483篇
  2011年   487篇
  2010年   260篇
  2009年   217篇
  2008年   396篇
  2007年   462篇
  2006年   471篇
  2005年   447篇
  2004年   431篇
  2003年   420篇
  2002年   374篇
  2001年   66篇
  2000年   57篇
  1999年   55篇
  1998年   47篇
  1997年   52篇
  1996年   47篇
  1995年   17篇
  1994年   28篇
  1993年   16篇
  1992年   29篇
  1991年   26篇
  1990年   27篇
  1989年   33篇
  1988年   27篇
  1987年   14篇
  1986年   17篇
  1985年   17篇
  1984年   15篇
  1983年   12篇
  1982年   13篇
  1981年   11篇
  1980年   13篇
  1979年   9篇
  1978年   10篇
  1977年   10篇
  1970年   10篇
  1969年   9篇
  1966年   9篇
排序方式: 共有6985条查询结果,搜索用时 15 毫秒
81.
82.
83.
BACKGROUND: Although Helicobacter pylori is a significant etiologic factor of peptic ulcer disease, it remains unknown why ulcers develop only in the minority of infected individuals. AIM: The aim of this cross-sectional study was to evaluate the association between the presence of duodenal ulcer in H. pylori-infected patients and different risk factors. METHODS: A total of 122 H. pylori-infected patients were enrolled; 79 had duodenal ulcer and 43 gastritis. Univariate analysis was conducted using either Fisher's exact test or exact Cochrane-Armitage trend test. In multivariate analysis the logistic model was used. RESULTS: Univariate analysis indicated six factors (male sex, smoking, antral H. pylori density, CAGA presence in antrum, and VACA s1a presence in antrum and corpus). Four factors (sex, smoking-alcohol index, H. pylori density index, and CAGA index) were found to be significant in multivariate analysis. The best model predicting duodenal ulcer included male sex, smoking, presence of H. PYLORI on histopathology in antrum and CAGA presence in corpus. CONCLUSION: Although several risk factors were significantly associated with duodenal ulcer, we failed in the identification of either a single risk factor or a set of factors that can unequivocally differentiate patients with ulcer from those with gastritis.  相似文献   
84.
85.
Acute coronary syndrome after amphetamine use in a young male with myocardial bridging - a case report. A case of a 19-year-old male hospitalised due to acute coronary syndrome following amphetamine use is presented. Coronary angiography revealed the presence of myocardial bridging causing a 90% stenosis of the left anterior descending coronary artery. The patient was treated conservatively and the outcome was uneventful.  相似文献   
86.
Arrhythmogenic right ventricular cardiomyopathy (ARVC) is an inheritant disease with an autosomal dominant mode of transmission with incomplete penetrance and variable expression. Linkage analysis in affected families succeeds in identifying 9 loci determining 9 subtypes of the disease. Genotype phenotype correlation is unclear and the influence of various environmental factors is discussed. OBJECTIVES: Genotype phenotype correlation in 2 pairs of monozygotic twins with ARVC and the role of environmental factors are analyzed. PATIENTS AND METHODS: Among 40 pts with ARVC and their 195 relatives there were 2 pairs of monozygotic twins: brothers, age 47 y; and sisters, age 48 y. History, ECG, Holter monitoring, 2D and Doppler Echo, and MRI were analyzed. RESULTS: Twin brothers: ARVC was diagnosed in the proband after the episode of VT with LBBB morphology (enlarged right ventricle, focal hypokinesia of apex, MR evidence of adipose tissue in RV wall). Identical morphology of RV was seen in asymptomatic twin brother. The patient presenting arrhythmia has been rowing for 4 years. Twin sisters: diagnosis was done during family screening. Both were asymptomatic. RV morphology typical for ARVC was found discrete in one of them (bulges adipose tissue in the RV apex); the latter showed changes suggesting RV abnormality (mild segmental dilatation of infundibulum, adipose tissue in a free wall of the RV). No differences in previous viral infections and sports involvement were observed. CONCLUSIONS: 1. Clinical picture of ARVC in monozygotic twins is not identical. 2. Strenuous effort may be a factor triggering the arrhythmia in pts with ARVC.  相似文献   
87.
Patients with exercise angina >2 months (n:13) showed significantly lower SigmaST elevation during 120 s balloon coronary occlusion than those with =<2 months (n:7), or those with angina at rest <=2 days (n:8) but similar to patients with angina at rest >2 days (n:7). These results underscore the importance of the kind and duration of angina in limiting the extent of ischemia during coronary occlusion.  相似文献   
88.
89.
GeroScience - A complex picture of factors influencing cognition is necessary to be drawn for a better understanding of the role of potentially modifiable factors in dementia. The aim was to assess...  相似文献   
90.
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