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   2730633篇
  免费   217841篇
  国内免费   4668篇
耳鼻咽喉   39474篇
儿科学   84969篇
妇产科学   72423篇
基础医学   396085篇
口腔科学   78584篇
临床医学   247863篇
内科学   526914篇
皮肤病学   56517篇
神经病学   223785篇
特种医学   108507篇
外国民族医学   936篇
外科学   414523篇
综合类   62205篇
现状与发展   1篇
一般理论   1069篇
预防医学   218975篇
眼科学   64515篇
药学   206787篇
  4篇
中国医学   5035篇
肿瘤学   143971篇
  2018年   27367篇
  2016年   23245篇
  2015年   26166篇
  2014年   37558篇
  2013年   57238篇
  2012年   77391篇
  2011年   82189篇
  2010年   48282篇
  2009年   46120篇
  2008年   78046篇
  2007年   83190篇
  2006年   84166篇
  2005年   81906篇
  2004年   79074篇
  2003年   76138篇
  2002年   75451篇
  2001年   126877篇
  2000年   131569篇
  1999年   110736篇
  1998年   31462篇
  1997年   28479篇
  1996年   28653篇
  1995年   27505篇
  1994年   25799篇
  1993年   24178篇
  1992年   89437篇
  1991年   87517篇
  1990年   84929篇
  1989年   81995篇
  1988年   76187篇
  1987年   75034篇
  1986年   71102篇
  1985年   67815篇
  1984年   51107篇
  1983年   43617篇
  1982年   26082篇
  1981年   23243篇
  1980年   21858篇
  1979年   48386篇
  1978年   34185篇
  1977年   28702篇
  1976年   27169篇
  1975年   29042篇
  1974年   35805篇
  1973年   33803篇
  1972年   31959篇
  1971年   29700篇
  1970年   27872篇
  1969年   26026篇
  1968年   23828篇
排序方式: 共有10000条查询结果,搜索用时 609 毫秒
41.
42.
43.
44.
45.
46.

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   
47.
School Mental Health - A dual approach to mental health in schools has been widely defended, where the assessment of psychological distress and the examination of strengths/well-being are two...  相似文献   
48.
Gattermann  J. 《Der Onkologe》2020,26(11):1010-1018
Die Onkologie - Die Corona-Pandemie hat in den letzten Monaten verdeutlicht, dass das Thema Sterblichkeit trotz erheblicher Fortschritte im Bereich der Hospiz- und Palliativversorgung zu...  相似文献   
49.
Non-clear cell renal cell carcinoma is a very rare malignancy that includes several histological subtypes. Each subtype may need to be addressed separately regarding prognosis and treatment; however, no Phase III clinical trial data exist. Thus, treatment recommendations for patients with non-clear cell metastatic RCC (mRCC) remain unclear. We present first prospective data on choice of first- and second-line treatment in routine practice and outcome of patients with papillary mRCC. From the prospective German clinical cohort study (RCC-Registry), 99 patients with papillary mRCC treated with systemic first-line therapy between December 2007 and May 2017 were included. Prospectively enrolled patients who had started first-line treatment until May 15, 2016, were included into the outcome analyses (n = 82). Treatment was similar to therapies used for clear cell mRCC and consisted of tyrosine kinase inhibitors, mechanistic target of rapamycin inhibitors and recently checkpoint inhibitors. Median progression-free survival from start of first-line treatment was 5.4 months (95% confidence interval [CI], 4.1–9.2) and median overall survival was 12.0 months (95% CI, 8.1–20.0). At data cutoff, 73% of the patients died, 6% were still observed, 12% were lost to follow-up, and 9% were alive at the end of the individual 3-year observation period. Despite the lack of prospective Phase III evidence in patients with papillary mRCC, our real-world data reveal effectiveness of systemic clear cell mRCC therapy in papillary mRCC. The prognosis seems to be inferior for papillary compared to clear cell mRCC. Further studies are needed to identify drivers of effectiveness of systemic therapy for papillary mRCC.  相似文献   
50.
Bulletin of Experimental Biology and Medicine - Ammonium, an end-product of catabolism, in low doses can promote adaptation of metabolic pathways in erythrocytes under conditions of extreme...  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