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   308721篇
  免费   17611篇
  国内免费   740篇
耳鼻咽喉   4457篇
儿科学   11120篇
妇产科学   7948篇
基础医学   43069篇
口腔科学   10727篇
临床医学   22753篇
内科学   64366篇
皮肤病学   8373篇
神经病学   25366篇
特种医学   11621篇
外国民族医学   58篇
外科学   42979篇
综合类   3140篇
现状与发展   2篇
一般理论   95篇
预防医学   24575篇
眼科学   7327篇
药学   20263篇
中国医学   1180篇
肿瘤学   17653篇
  2022年   2448篇
  2021年   4611篇
  2020年   3084篇
  2019年   4467篇
  2018年   6210篇
  2017年   4755篇
  2016年   5086篇
  2015年   5931篇
  2014年   7933篇
  2013年   10214篇
  2012年   15450篇
  2011年   15920篇
  2010年   8673篇
  2009年   7927篇
  2008年   13017篇
  2007年   13962篇
  2006年   13416篇
  2005年   13747篇
  2004年   13021篇
  2003年   11999篇
  2002年   10163篇
  2001年   12274篇
  2000年   12154篇
  1999年   10467篇
  1998年   3401篇
  1997年   3034篇
  1996年   2772篇
  1995年   2416篇
  1994年   2272篇
  1993年   2199篇
  1992年   6542篇
  1991年   6277篇
  1990年   6045篇
  1989年   5832篇
  1988年   5223篇
  1987年   4950篇
  1986年   4726篇
  1985年   4466篇
  1984年   3316篇
  1983年   2690篇
  1982年   1568篇
  1981年   1519篇
  1979年   2837篇
  1978年   2024篇
  1977年   1666篇
  1975年   1800篇
  1974年   1839篇
  1973年   1807篇
  1972年   1568篇
  1971年   1442篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
1.
2.
3.
4.
5.

Purpose

Endovascular treatment with mechanical thrombectomy devices demonstrated high recanalization rates but functional outcome did not correlate with high rates of recanalization obtained. Patient selection prior to the endovascular treatment is very important in the final outcome of the patient. The primary aim of our study was to evaluate the prognostic value of posterior circulation Alberta Stroke Program Early CT Score (pc-ASPECTS) and Pons-Midbrain Index (PMI) scores in patients with Basilar Artery Occlusion (BAO) treated with successful angiographic recanalization after mechanical thrombectomy.

Methods

Retrospective single-center study including 18 patients between 2008 and 2013 who had acute basilar artery occlusion managed with endovascular treatment within 24 hours from symptoms onset and with successful angiographic recanalization. The patients were initially classified into two groups according to clinical outcome and mortality at 90 days. For analysis we also divided patients into groups based on pc-ASPECTS (≥8vs.< 8) and PMI (≥3vs.< 3) on non-contrast CT (NCCT) and CT Angiography Source Images (CTASI). Imaging data were correlated to clinical outcome and mortality rate.

Results

CTASI pc-ASPECTS, dichotomized at < 8 versus≥8, was associated with a favorable outcome (RR: 2.6; 95% CI: 1.3-5.2) and a reduced risk of death (RR: 6.5: 95% CI: 7.8-23.3). All patients that survived and were functionally independent had pc-ASPECTS score≥8. None of the 5 patients with CTASI pc-ASPECTS score less than 8 survived.

Conclusion

PC-ASPECTS on CTASI is helpful for predicting functional outcome after BAO recanalization with endovascular treatment. These results should be validated in a randomized controlled trial in order to decide whether or not to treat a patient with BAO.  相似文献   
6.
Neorickettsia helminthoeca (NH), the agent of salmon poisoning disease or canine neorickettiosis (CN), is a bacterial endosymbiont of the nematode Nanophyetus salmincola, and infections are spreading among specific fish‐eating mammalians. This article describes the pathologic and immunohistochemical findings associated with spontaneous NH‐induced infections in dogs from Southern Brazil. The principal pathologic findings were hypertrophy of Peyer patches and lymphadenopathy with lymphocytic proliferation, chronic interstitial pneumonia, and chronic enteritis associated with positive intralesional immunoreactivity to antigens of NH within macrophages and histiocytes. Positive immunoreactivity against canine parvovirus‐2 (CPV‐2) or/and canine distemper virus was not detected in the evaluated intestinal segments or in the samples from the cerebellum and lungs, respectively, from the dogs evaluated. These findings demonstrated that NH was involved in the enteric, pulmonary, and lymphoid lesions herein described, and provide additional information to confirm the occurrence of this bacterial endosymbiont within this geographical location. It is proposed that chronic pneumonia should be considered as a pathologic manifestation of NH‐induced infections. Additionally, our results show that the occurrences of CN seem to be underdiagnosed in Southern Brazil due to the confusion with the incidence of CPV‐2.  相似文献   
7.
8.
9.
10.
Depigmented lesions may occur as postinflammatory sequelae of subacute cutaneous lupus erythematosus (SCLE), leading to great psychosocial impact. A 53‐year‐old male patient presented with post‐SCLE depigmented facial lesions after five years of disease stability. We proposed surgical treatment with melanocyte‐keratinocyte transplantation procedure (MKTP), and after five months the patient achieved 90% repigmentation, without Koebner phenomenon (KP). In theory, KP is a possible complication of MKTP procedure since the preparation of the receptor area involves the use of dermabrasion. In an attempt to avoid it, we suggest to maintain the treatment of the underlying disease and wait for a minimum period of disease stability before the procedure.  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