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   4374篇
  免费   342篇
  国内免费   25篇
耳鼻咽喉   26篇
儿科学   187篇
妇产科学   86篇
基础医学   558篇
口腔科学   82篇
临床医学   621篇
内科学   731篇
皮肤病学   101篇
神经病学   367篇
特种医学   319篇
外科学   524篇
综合类   114篇
一般理论   7篇
预防医学   360篇
眼科学   41篇
药学   205篇
  2篇
中国医学   2篇
肿瘤学   408篇
  2022年   23篇
  2021年   56篇
  2020年   40篇
  2019年   69篇
  2018年   72篇
  2017年   49篇
  2016年   59篇
  2015年   91篇
  2014年   94篇
  2013年   156篇
  2012年   183篇
  2011年   192篇
  2010年   141篇
  2009年   143篇
  2008年   204篇
  2007年   197篇
  2006年   206篇
  2005年   192篇
  2004年   169篇
  2003年   151篇
  2002年   129篇
  2001年   131篇
  2000年   146篇
  1999年   126篇
  1998年   122篇
  1997年   115篇
  1996年   85篇
  1995年   77篇
  1994年   65篇
  1993年   69篇
  1992年   86篇
  1991年   100篇
  1990年   60篇
  1989年   106篇
  1988年   83篇
  1987年   68篇
  1986年   55篇
  1985年   58篇
  1984年   49篇
  1983年   41篇
  1982年   44篇
  1981年   34篇
  1980年   34篇
  1979年   23篇
  1978年   37篇
  1977年   27篇
  1976年   28篇
  1975年   28篇
  1974年   24篇
  1973年   28篇
排序方式: 共有4741条查询结果,搜索用时 15 毫秒
1.
2.
The levels of residual radioactivity induced in Havar foils at the entrance of a high-pressure 18O-enriched water target used for the production of 18F- in a medical cyclotron with 16 MeV protons have been determined using high-resolution gamma-ray spectrometry. Whole body and skin dose rates arising from exposure to these foils during their periodic replacement have been estimated. The results indicate that irradiated foils do not represent a significant radiological hazard for the cyclotron operating staff and that no waste disposal difficulties should be encountered after an appropriate 'cooling' period of 2 years.  相似文献   
3.
4.
Auditory P300 and eye tracking dysfunction in schizophrenic pedigrees   总被引:4,自引:0,他引:4  
Several psychophysiological abnormalities associated with schizophrenia have been proposed as genetic trait markers of vulnerability to the disorder. Smooth pursuit eye tracking dysfunction and abnormal long latency event-related potentials are the most promising candidates. Both are independent of the effects of psychotropic medication or mental state at the time of testing, and twin studies demonstrate that each has a high level of heritability. Having recorded smooth pursuit eye tracking and event-related potentials in 20 high-density schizophrenic families, we find abnormalities in one or both measures in most of the families studied. The abnormalities, when present, occur in the family members with schizophrenia and other forms of functional psychosis, and they have a bimodal distribution with approximately half the nonschizophrenic relatives also showing eye tracking dysfunction and/or abnormal event-related potentials. Some of these relatives had psychiatric symptoms; others were normal. Our results suggest that psychophysiological examination can help to clarify the boundaries of schizophrenia spectrum disorder. By helping to decide the phenotypic status of nonschizophrenic family members, this should increase the power of DNA linkage studies.  相似文献   
5.
6.
Pyomyositis: characteristics at CT and MR imaging   总被引:9,自引:0,他引:9  
Gordon  BA; Martinez  S; Collins  AJ 《Radiology》1995,197(1):279
  相似文献   
7.
Dilatation and curettage (D+C) is the most common operation performed in Britain. The liberal use of D+C has been criticised. The objective of this study was to evaluate the use of outpatient endometrial pipelle biopsy and determine its safety in terms of detecting abnormalities. Complications and financial costs were also evaluated. Data were reviewed from an active gynaecological unit from February 1993 to January 1995. A total of 303 D+Cs and 104 endometrial pipelle biopsies were performed in this period. Nine malignancies were detected by D+C and 1 by pipelle biopsy. A total of 24 and 3 benign abnormalities were detected by each method respectively. There was a higher complication rate in the D+C group but the failure rate was higher in the endometrial pipelle biopsy group. The monetary savings over this period is estimated at £20,307. There were no missed malignancies to our knowledge over the 8 yr period since endometrial pipelle biopsy was introduced to the hospital.  相似文献   
8.
SUMMARY A case is reported of pseudohyperphosphataemia in association with a monoclonal gammopathy of undetermined significance.  相似文献   
9.
The pedicle patch urethroplasty provides an alternative single-stage vascularised graft procedure for the repair of moderately severe hypospadias. Over a 7-year period, 38 primary hypospadias repairs were performed employing this technique. The fistula rate was 18% in the 34 patients reviewed, but there were few other significant complications. The operation is recommended when the urethral plate can be preserved and the penis straightened in boys who are unsuitable for a meatal-based flap.  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