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   2054429篇
  免费   151514篇
  国内免费   6111篇
耳鼻咽喉   27406篇
儿科学   66867篇
妇产科学   57645篇
基础医学   298189篇
口腔科学   56600篇
临床医学   190491篇
内科学   400598篇
皮肤病学   41747篇
神经病学   168985篇
特种医学   77373篇
外国民族医学   672篇
外科学   299342篇
综合类   44964篇
现状与发展   1篇
一般理论   699篇
预防医学   167371篇
眼科学   46299篇
药学   149815篇
  6篇
中国医学   4534篇
肿瘤学   112450篇
  2019年   16590篇
  2018年   23205篇
  2017年   17774篇
  2016年   19293篇
  2015年   21957篇
  2014年   30622篇
  2013年   47392篇
  2012年   64624篇
  2011年   68840篇
  2010年   40452篇
  2009年   37733篇
  2008年   63677篇
  2007年   67508篇
  2006年   67659篇
  2005年   65823篇
  2004年   62768篇
  2003年   60096篇
  2002年   58772篇
  2001年   91293篇
  2000年   94007篇
  1999年   79425篇
  1998年   22663篇
  1997年   20594篇
  1996年   20304篇
  1995年   19171篇
  1994年   18066篇
  1993年   17033篇
  1992年   63109篇
  1991年   61453篇
  1990年   59771篇
  1989年   57073篇
  1988年   52940篇
  1987年   51826篇
  1986年   49489篇
  1985年   47363篇
  1984年   35757篇
  1983年   30397篇
  1982年   18439篇
  1979年   32683篇
  1978年   23155篇
  1977年   19243篇
  1976年   18668篇
  1975年   19576篇
  1974年   23744篇
  1973年   23037篇
  1972年   21525篇
  1971年   19966篇
  1970年   18756篇
  1969年   17314篇
  1968年   16534篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
51.

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   
52.
Purpose: To use polymerase chain reaction (PCR) and Goldmann-Witmer coefficient (GWC) calculation to diagnose infectious uveitis.

Methods: Prospective cross-sectional study.

Results: Twenty-seven of 106 patients had positive PCR and/or GWC results on aqueous humor (AH) sampling and 15 of 27 (55.6%) were HIV-positive. Patients with non-anterior uveitis (NAU) were more likely to be HIV+ (p = 0.005). More than 1 possible pathogen was identified in 9 of 27 patients of whom 7 were HIV+. The final clinical diagnosis was discordant with AH findings in 9 of 27 cases. A positive EBV PCR result was associated with a discordant diagnosis (p = 0.001). All cases of herpetic anterior uveitis (42.9% HIV+) tested PCR-/GWC+ while all cases of herpetic NAU tested PCR+/GWC- (83.3% HIV+). All rubella virus cases were PCR+/GWC+.

Conclusion: PCR is useful to diagnose herpetic NAU in HIV+ patients while GWC is useful to diagnose herpetic anterior uveitis.  相似文献   

53.
54.
55.
56.
57.
58.
59.
60.
We report a Chinese family with members affected by epidermolytic ichthyosis (EI), caused by KRT gene mutations. The proband was a 14‐year‐old boy who had simultaneous appearance of nephroblastoma and epidermolytic ichthyosis (EI). Both the patient and his mother exhibited the specific clinical and pathological manifestations of EI. We analysed all exons and flanking sequences of the KRT1 and KRT10 genes using PCR, and found that the proband and his mother had a G>C transition at nucleotide position 1432 in exon 7 of KRT1, resulting in an amino acid substitution of glutamate (GAA) to glutamine (CAA) at codon 478 (E478Q). The KRT10 gene had no mutations.  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