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   1481篇
  免费   86篇
  国内免费   38篇
耳鼻咽喉   7篇
儿科学   65篇
妇产科学   17篇
基础医学   158篇
口腔科学   28篇
临床医学   176篇
内科学   329篇
皮肤病学   15篇
神经病学   104篇
特种医学   197篇
外科学   169篇
综合类   14篇
预防医学   98篇
眼科学   20篇
药学   137篇
中国医学   3篇
肿瘤学   68篇
  2023年   9篇
  2022年   6篇
  2021年   20篇
  2020年   13篇
  2019年   23篇
  2018年   28篇
  2017年   29篇
  2016年   27篇
  2015年   32篇
  2014年   28篇
  2013年   47篇
  2012年   64篇
  2011年   61篇
  2010年   69篇
  2009年   62篇
  2008年   57篇
  2007年   68篇
  2006年   47篇
  2005年   53篇
  2004年   54篇
  2003年   35篇
  2002年   28篇
  2001年   45篇
  2000年   34篇
  1999年   25篇
  1998年   52篇
  1997年   53篇
  1996年   52篇
  1995年   45篇
  1994年   44篇
  1993年   34篇
  1992年   25篇
  1991年   24篇
  1990年   22篇
  1989年   39篇
  1988年   31篇
  1987年   17篇
  1986年   24篇
  1985年   22篇
  1984年   8篇
  1983年   7篇
  1982年   12篇
  1981年   10篇
  1980年   13篇
  1979年   12篇
  1978年   11篇
  1977年   11篇
  1976年   11篇
  1975年   10篇
  1931年   6篇
排序方式: 共有1605条查询结果,搜索用时 31 毫秒
11.
An 89-year-old woman developed an acute carpal tunnel syndrome secondary to hemarthrosis associated with pigmented villonodular synovitis of the wrist. Pigmented villonodular synovitis is rare in a patient of this age and is an unusual cause of carpal tunnel syndrome.  相似文献   
12.
13.
A survey of persons soliciting sex in an area known to be frequented by prostitutes in Albuquerque, NM, included 43 females and 66 males. Seroprevalence rates found in this population-based study were as follows: human immunodeficiency virus type 1 (HIV-1), 3%; hepatitis B, 39%; hepatitis C, 45%. Increased age, intravenous drug use, and condom use were independent risk factors for hepatitis B. Female gender and intravenous drug use were independent risk factors for hepatitis C. Neither sharing injection equipment nor engaging in receptive anal intercourse was independently associated with hepatitis B or C.  相似文献   
14.
Background: Spherophakia is an uncommon diagnosis. This is the first case report of spherophakia evaluated by ultrasound biomicroscopy.
Methods: Ultrasound biomicroscopy is a new diagnostic technique developed by one of the authors and provides images with microscopic resolution of the anterior segment. A patient with spherophakia was evaluated by ultrasound biomicroscopy (Zeiss-Humphrey, 50MHz) before and after YAG laser iridotomy.
Results: Ultrasound biomicroscopic assessment revealed a shallow anterior chamber, a very steep anterior lens curvature, iridolenticular contact, elongated zonules, and an increased distance between the lens equator and the ciliary processes. Angle closure glaucoma was due to a pupil block mechanism. The pupil block was relieved by YAG laser iridotomy.
Conclusions: Ultrasound biomicroscopy is a useful technique to confirm the diagnosis of spherophakia. The pupil block in spherophakia is relieved by YAG laser iridotomy.  相似文献   
15.
Human leukocyte elastase, a neutrophil-derived serine protease, is present in psoriatic lesions in an enzymatically active form. Our purpose was to assess the significance of human leukocyte elastase determinations in estimating the inflammatory activity of psoriatic lesions. A standardized method was used to analyse lesional elastase activity. Elastase activities were correlated with erythema, induration and hyperkeratosis of psoriatic lesions in 54 patients. Lesional elastase activities were also determined during treatment with salt-water bathing and UVB irradiation. Lesional elastase activity correlated with skin induration and was inversely correlated with hyperkeratosis of the lesions. Psoriatic lesions with high elastase activity responded well to therapy, whereas lesions with low elastase activity appeared to be comparatively resistant. This study shows that by quantitative determination of lesional elastase activities it is possible to distinguish predominantly inflammatory from predominantly hyperproliferative psoriasis. The latter shows delayed responsiveness to topical therapy with salt-water bathing plus UVB irradiation.  相似文献   
16.
17.
18.
19.
The calcium-binding protein S100A4 induces the metastatic phenotype in rodent models of breast cancer and its expression correlates strongly with reduced survival in human breast cancer. The expression of S100A4 in normal bladders and 101 bladder tumours has been studied using immunocytochemistry. Moderate or strong expression of S100A4 was found in 28% of the tumours, whilst the remaining tumours and normal urothelium either failed to stain or showed weak staining. S100A4 staining was more frequently observed in invasive bladder tumours than in non-invasive tumours (p<0.05). In invasive tumours, S100A4 staining was usually strongest in invasive regions and single infiltrating cells. Statistically significant associations were found between S100A4 expression and metastasis (p=0.0003) and reduced survival (p<0.0001). It is concluded that S100A4 expression may play an important role in bladder cancer and may identify a subgroup of patients at increased risk of metastasis who should be considered for adjuvant systemic therapy.  相似文献   
20.
The development of both adenocarcinoma of the jejunum and in situ squamous carcinoma of the oesophagus in an adult coeliac patient is described. Good evidence that adenocarcinoma of jejunum occurs more frequently in patients with coeliac disease has recently become available though this association has been suggested for some time. While oesophageal carcinoma has long been associated with coeliac disease, in situ carcinoma of oesophagus has not been previously described in these circumstances. We feel that the risk of this complication, as calculated from published series, warrants a screening programme for oesophageal malignancy in adult coeliacs.  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