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   34773篇
  免费   2162篇
  国内免费   551篇
耳鼻咽喉   103篇
儿科学   1728篇
妇产科学   2352篇
基础医学   2864篇
口腔科学   262篇
临床医学   3239篇
内科学   9096篇
皮肤病学   520篇
神经病学   2330篇
特种医学   742篇
外科学   3637篇
综合类   2367篇
现状与发展   1篇
一般理论   8篇
预防医学   2924篇
眼科学   1034篇
药学   1492篇
  2篇
中国医学   255篇
肿瘤学   2530篇
  2024年   93篇
  2023年   290篇
  2022年   282篇
  2021年   395篇
  2020年   386篇
  2019年   137篇
  2018年   538篇
  2017年   547篇
  2016年   627篇
  2015年   598篇
  2014年   549篇
  2013年   820篇
  2012年   2268篇
  2011年   2786篇
  2010年   995篇
  2009年   934篇
  2008年   2670篇
  2007年   2562篇
  2006年   2253篇
  2005年   2378篇
  2004年   2693篇
  2003年   2756篇
  2002年   2121篇
  2001年   1633篇
  2000年   494篇
  1999年   469篇
  1998年   502篇
  1997年   450篇
  1996年   368篇
  1995年   287篇
  1994年   346篇
  1993年   319篇
  1992年   352篇
  1991年   331篇
  1990年   324篇
  1989年   281篇
  1988年   216篇
  1987年   227篇
  1986年   182篇
  1985年   136篇
  1984年   91篇
  1983年   78篇
  1982年   73篇
  1981年   76篇
  1980年   63篇
  1979年   62篇
  1977年   43篇
  1976年   36篇
  1975年   48篇
  1973年   49篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
151.
Toxigenic Corynebacterium ulcerans is as an emerging zoonotic agent of diphtheria. We describe the zoonotic transmission of diphtheria caused by toxigenic C. ulcerans from domestic animals in Spain, confirmed by core-genome multilocus sequence typing. Alongside an increasing number of recent publications, our findings highlight the public health threat posed by diphtheria reemergence.  相似文献   
152.
BackgroundPerimetry is important in the management of children with glaucoma, but there is limited evidence-based guidance on its use. We report an expert consensus-based study to update guidance and identify areas requiring further research.MethodsExperts were invited to participate in a modified Delphi consensus process. Panel selection was based on clinical experience of managing children with glaucoma and UK-based training to minimise diversity of view due to healthcare setting. Questionnaires were delivered electronically, and analysed to establish ‘agreement’. Divergence of opinions was investigated and resolved where possible through further iterations.Results7/9 experts invited agreed to participate. Consensus (≥5/7 (71%) in agreement) was achieved for 21/26 (80.8%) items in 2 rounds, generating recommendations to start perimetry from approximately 7 years of age (IQR: 6.75–7.25), and use qualitative methods in conjunction with automated reliability indices to assess test quality. There was a lack of agreement about defining progressive visual field (VF) loss and methods for implementing perimetry longitudinally.Panel members highlighted the importance of informing decisions based upon individual circumstances—from gauging maturity/capability when selecting tests and interpreting outcomes, to accounting for specific clinical features (e.g. poor IOP control and/or suspected progressive VF loss) when making decisions about frequency of testing.ConclusionsThere is commonality of expert views in relation to implementing perimetry and interpreting test quality in the management of children with glaucoma. However, there remains a lack of agreement about defining progressive VF loss, and utilising perimetry over an individuals’ lifetime, highlighting the need for further research.Subject terms: Paediatrics, Glaucoma  相似文献   
153.
Sentinox (STX) is an acid-oxidizing solution containing hypochlorous acid in spray whose virucidal activity against SARS-CoV-2 has been demonstrated. In this paper, results of a randomized controlled trial (RCT) on the efficacy of STX in reducing viral load in mild COVID-19 patients (NCT04909996) and a complementary in vitro study on its activity against different respiratory viruses are reported. In the RCT, 57 patients were randomized (1:1:1) to receive STX three (STX-3) or five (STX-5) times/day plus standard therapy or standard therapy only (controls). Compared with controls, the log10 load reduction in groups STX-3 and STX-5 was 1.02 (p = 0.14) and 0.18 (p = 0.80), respectively. These results were likely driven by outliers with extreme baseline viral loads. When considering subjects with baseline cycle threshold values of 20–30, STX-3 showed a significant (p = 0.016) 2.01 log10 reduction. The proportion of subjects that turned negative by the end of treatment (day 5) was significantly higher in the STX-3 group than in controls, suggesting a shorter virus clearance time. STX was safe and well-tolerated. In the in vitro study, ≥99.9% reduction in titers against common respiratory viruses was observed. STX is a safe device with large virucidal spectrum and may reduce viral loads in mild COVID-19 patients.  相似文献   
154.
155.
本文对小鼠移植性肿瘤的自然消退与其免疫形成进行观察,结果表明:自然消退的EAC昆明鼠对肿瘤的再次攻击具有强烈的排斥反应。应用化疗药物RS034(Sodium sald.ofbishemisuccinate of 7β-Hydroxycholesterol)治愈的L_(1210) DBA/2小鼠进行肿瘤再次移植时,同样产生对抗作用。而用化疗药物5-Fu治愈的小鼠没有出现免疫排斥反应。  相似文献   
156.
本文通过全新的合成路线,以L-苯丙氨酸为起始化合物,经过甲酯化、游离、成内酐、缩合、水解、精制等6步反应得到天冬天精,总收率达到45.85%,较文献收率提高了8%,质量符合标准。  相似文献   
157.
中医疗效系统评价体系的研究   总被引:12,自引:0,他引:12  
临床疗效是中医药学生存在和发展的基础。建立中医临床疗效系统评价体系。对于科学、客观、系统地开展中医临床疗效的评价具有重要意义。本文研究并探讨了建立中医临床疗效系统评价体系所需达到的目标和发展思路,提出了建立该系统的重点任务及关键技术。  相似文献   
158.
JUSTIFICATION: Acute rheumatic fever and rheumatic chronic valvular heart disease is an important preventable cause of morbidity and mortality in suburban and rural India. Its diagnosis is based on clinical criteria. These criteria need verification and revision in the Indian context. Furthermore, there are glaring differences in management protocols available in literature. These facts prompted Indian Academy of Pediatrics to review the management of rheumatic fever. PROCESS: Management of Rheumatic fever was reviewed and recommendation was formulated at national consultative meeting on 20th May 2007 at New Delhi. OBJECTIVES: To formulate uniform guidelines on management of acute rheumatic fever and rheumatic heart disease in the Indian context. Guidelines were formulated for the management of streptococcal pharyngitis, acute rheumatic fever and its cardiac complication as well as secondary prophylaxis for recurrent episodes. RECOMMENDATIONS: (1) Streptococcal eradication with appropriate antibiotics (Benzathine penicillin single dose or penicillin V oral or azithromycin). (2) Diagnosis of rheumatic fever based on Jones criteria. (3) Control inflammatory process with aspirin with or without steroids (total duration of treatment of 12 weeks). (4) Treatment of chorea according to severity (therapy to continue for 2-3 weeks after clinical improvement). (5) Protocol for managing cardiac complication like valvular heart disease, congestive heart failure and atrial fibrillation. (6) Secondary prophylaxis with benzathine penicillin and management of anaphylaxis.  相似文献   
159.
160.
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