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   49491篇
  免费   4009篇
  国内免费   133篇
耳鼻咽喉   617篇
儿科学   1291篇
妇产科学   1123篇
基础医学   6633篇
口腔科学   947篇
临床医学   5650篇
内科学   9782篇
皮肤病学   502篇
神经病学   4094篇
特种医学   1648篇
外科学   7895篇
综合类   796篇
现状与发展   1篇
一般理论   38篇
预防医学   4741篇
眼科学   824篇
药学   3374篇
中国医学   78篇
肿瘤学   3599篇
  2023年   324篇
  2022年   365篇
  2021年   1330篇
  2020年   720篇
  2019年   1159篇
  2018年   1313篇
  2017年   938篇
  2016年   948篇
  2015年   1103篇
  2014年   1509篇
  2013年   2029篇
  2012年   3145篇
  2011年   3160篇
  2010年   1701篇
  2009年   1485篇
  2008年   2606篇
  2007年   2664篇
  2006年   2396篇
  2005年   2336篇
  2004年   2310篇
  2003年   2130篇
  2002年   2066篇
  2001年   1045篇
  2000年   1006篇
  1999年   932篇
  1998年   601篇
  1997年   532篇
  1996年   474篇
  1995年   461篇
  1994年   368篇
  1993年   311篇
  1992年   713篇
  1991年   593篇
  1990年   601篇
  1989年   556篇
  1988年   547篇
  1987年   517篇
  1986年   539篇
  1985年   516篇
  1984年   453篇
  1983年   379篇
  1982年   293篇
  1981年   272篇
  1980年   294篇
  1979年   395篇
  1978年   286篇
  1977年   258篇
  1974年   260篇
  1973年   237篇
  1972年   225篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
There are a number of proposed causes and treatment approaches for digital mucoid cysts. The described treatment outcomes for this cyst have been variable, with the highest success rate reported with complete excision and single-lobe skin flap closure. This report describes a bilobed flap reconstruction in conjunction with resection of the head of the middle phalanx. A retrospective review was undertaken to evaluate the recurrence rate, complications, and patient satisfaction with this combined procedure. Fifteen patients with an average follow-up of 4.6 years were evaluated. There were no recurrences, flap failures, or other major complications. The use of this flap allows for greater exposure than traditional semi-elliptical incisions while allowing the wide excisional defects to be closed primarily.  相似文献   
102.
BACKGROUND: Recipients of hearts from donors with spontaneous intracerebral hemorrhage (ICH) are at increased risk of allograft vasculopathy compared with trauma donors. We have recently shown that the vitronectin receptor (integrin alpha(V)beta3) is upregulated in transplant vasculopathy. We hypothesized that donor ICH is associated with systemic activation of alpha(V)beta3 in the donor before transplantation. METHODS: We evaluated mRNA expressions of alpha(V)beta3 (TaqMan PCR) in endomyocardial biopsy samples at 1-week post-transplant in 20 recipients from ICH donors and 20 recipients from trauma donors. To investigate whether systemic activation of alpha(V)beta3 was present in the donor before transplantation, alpha(V)beta3 expression was also evaluated in the corresponding donor spleen lymphocytes. All patients underwent serial coronary intravascular ultrasound to evaluate for coronary vasculopathy. The baseline characteristics were similar except for increased donor age in the ICH Group. RESULTS: The ICH Group showed significant increased mRNA expression of alpha(V)beta3 in the heart biopsy samples (3.8-fold, p = 0.012) and in the corresponding donor spleen lymphocytes (3.5-fold, p = 0.014) compared with the Trauma Group. At 1 year, the ICH Group also showed increased progression of coronary vasculopathy. Multivariate regression analysis found that donor lymphocytic alpha(V)beta3 mRNA expression was independently associated with increased risk of vasculopathy (odds ratio, 1.9; 95% CI, 1.21-3.98, p = 0.03). CONCLUSIONS: Our report demonstrates the presence of systemic activation of alpha(V)beta3 in donors with spontaneous intracerebral hemorrhage and its association with the subsequent development of allograft vasculopathy in the recipient.  相似文献   
103.
104.
In patients with cancer, constipation is a common complication. However, unlike in the general population, the impact of the symptoms of constipation on the quality of life in cancer patients is often greater. More importantly, in patients who are in the more advanced stages of the disease, constipation may also be suggestive of disease progression. Constipation as a symptom in this population is of significant importance as it may lead to life-threatening complications, i.e. bowel perforation due to fecal impaction. Therefore, in this regard, this problem deserves particular attention, as early recognition and management of complications may prevent further physical deterioration. This review aims to provide an overview of the management of constipation in patients with cancer. A symptom-based criteria definition for chronic constipation and prevalence of the problem in cancer patients provides a brief introduction. For the initial assessment and evaluation of constipation in cancer patients, an algorithm is described. The different possible etiologies of constipation in cancer patients are also discussed. Regarding therapeutic management, guidelines and recommendations for the use of different types of laxatives, stool softeners, suppositories and rectal enemas, prokinetic agents, antidepressant medications, and miscellaneous agents are succinctly discussed. Management of fecal impaction and opioid-induced bowel dysfunction are also described. Lastly, a brief overview of the management of acute colonic pseudo-obstruction and surgical or endoscopic options for large bowel obstruction are described.  相似文献   
105.
106.
107.

Background  

Knowledge of the structure and character of inter-organizational relationships found among health promotion organizations is a prerequisite for the development of evidence-based network-level intervention activities. The Alberta Healthy Living Network (AHLN) mapped the inter-organizational structure of its members to examine the effects of the network environment on organizational-level perceptions. This exploratory analysis examines whether network structure, specifically partnership ties among AHLN members, influences organizational perceptions of support after controlling for organizational-level attributes.  相似文献   
108.
109.
110.
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