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   952726篇
  免费   68361篇
  国内免费   5521篇
耳鼻咽喉   13003篇
儿科学   29206篇
妇产科学   26776篇
基础医学   133489篇
口腔科学   25759篇
临床医学   81500篇
内科学   191582篇
皮肤病学   19705篇
神经病学   74282篇
特种医学   38864篇
外国民族医学   373篇
外科学   148060篇
综合类   26724篇
现状与发展   7篇
一般理论   249篇
预防医学   67932篇
眼科学   21626篇
药学   69230篇
  43篇
中国医学   4469篇
肿瘤学   53729篇
  2021年   8705篇
  2019年   8171篇
  2018年   10971篇
  2017年   8800篇
  2016年   9420篇
  2015年   11269篇
  2014年   15544篇
  2013年   22054篇
  2012年   30177篇
  2011年   31912篇
  2010年   19548篇
  2009年   18199篇
  2008年   29253篇
  2007年   30727篇
  2006年   30707篇
  2005年   29970篇
  2004年   28114篇
  2003年   27129篇
  2002年   26519篇
  2001年   42480篇
  2000年   43720篇
  1999年   37377篇
  1998年   10591篇
  1997年   9816篇
  1996年   9612篇
  1995年   8887篇
  1994年   8443篇
  1993年   7828篇
  1992年   28507篇
  1991年   27212篇
  1990年   26605篇
  1989年   25515篇
  1988年   23684篇
  1987年   23285篇
  1986年   22340篇
  1985年   21229篇
  1984年   15848篇
  1983年   13516篇
  1982年   8105篇
  1979年   14607篇
  1978年   10214篇
  1977年   8631篇
  1976年   8151篇
  1975年   8962篇
  1974年   10705篇
  1973年   10193篇
  1972年   9663篇
  1971年   8926篇
  1970年   8591篇
  1969年   8035篇
排序方式: 共有10000条查询结果,搜索用时 405 毫秒
71.
72.

Background

Arterial vascular anomalies in patients undergoing kidney transplantation (KT) are correlated with a higher incidence of early surgical complications, potentially causing graft loss. Arterial reconstruction allows patients to overcome these surgical challenges, thus minimizing the risk of poor outcomes. The aim of the present study is to retrospectively investigate the safety and effectiveness of the multiple arterial reconstruction technique with a Teflon patch in case of an unavailable aortic patch: to do so, surgical complications, graft function, and patient survival were evaluated.

Methods

During the period January 2009 to August 2016, 202 adult deceased-donor KTs were performed at our center. Group A (n = 27; reconstruction of multiple arteries) and Group B (n = 175; control group) were compared.

Results

No differences were observed between the 2 groups in terms of early postoperative course, with no vascular complication observed in Group A. No vascular patch infections were reported, nor longer cold ischemia time rates. Similarly, long-term survival rates were similar between the 2 groups.

Conclusions

The Teflon-patch arterial reconstruction technique appears to be safe and effective, with an acceptable balance of benefits and potential risks of using a prosthetic material. Studies based on larger series are needed to further validate this approach.  相似文献   
73.
To evaluate the anthropometric indexes in subjects with varicocele compared to controls and the incidence of varicocele in different body mass index (BMI) groups for the purpose of exploring the association between varicocele and anthropometric indexes. A comprehensive literature search was conducted by using PubMed, MEDLINE, EMBASE databases and Cochrane Library up to February 2019. A systematic review and meta‐analysis was conducted by STATA, and Newcastle–Ottawa Scale was utilised for assessing risk of bias. Ultimately, 13 articles containing seven case–control studies and six cross‐sectional studies with 1,385,630 subjects were involved in our study. Pooled results demonstrated that varicocele patients had a lower BMI (WMD = ?0.77, 95% CI = ?1.03 to ?0.51) and a higher height than nonvaricocele participants, especially in grade 3 varicocele patients. Subgroup analyses showed that normal BMI individuals had a higher risk of varicocele than obese or overweight individuals and a lower risk than underweight individuals. In conclusion, this study indicates that varicocele patients have a lower BMI and a higher height than nonvaricocele participants. Moreover, men with excess bodyweight have a lower incidence of varicocele compared to normal weight or underweight people. That is to say, high BMI and adiposity protect against varicocele and high BMI is associated with a decreased risk of varicocele.  相似文献   
74.
75.
76.
77.
Demodex mites are microscopic arachnids found in the normal skin of many mammals. In humans, it is well established that Demodex mite density is higher in patients with the skin condition rosacea, and treatment with acaricidal agents is effective in resolving symptoms. However, pathophysiology of rosacea is complex and multifactorial. In dogs, demodicosis is a significant veterinary issue, particularly the generalized form of the disease which can be fatal if untreated. In each species, clinical and molecular studies have shown that the host’s immunological interactions with Demodex mites are an important, but not fully understood, aspect of how Demodex can live in the skin either as a harmless commensal organism or as a pathogenic agent. This review outlines the role of Demodex mites in humans and dogs, considering morphology, prevalence, symptoms, diagnosis, histology treatment and pathogenesis.  相似文献   
78.
79.
80.
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