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   3453篇
  免费   176篇
  国内免费   8篇
耳鼻咽喉   58篇
儿科学   284篇
妇产科学   51篇
基础医学   303篇
口腔科学   130篇
临床医学   278篇
内科学   739篇
皮肤病学   67篇
神经病学   138篇
特种医学   78篇
外科学   508篇
综合类   119篇
预防医学   159篇
眼科学   98篇
药学   381篇
中国医学   29篇
肿瘤学   217篇
  2023年   45篇
  2022年   119篇
  2021年   160篇
  2020年   85篇
  2019年   94篇
  2018年   160篇
  2017年   112篇
  2016年   136篇
  2015年   137篇
  2014年   182篇
  2013年   213篇
  2012年   271篇
  2011年   293篇
  2010年   153篇
  2009年   120篇
  2008年   147篇
  2007年   148篇
  2006年   139篇
  2005年   114篇
  2004年   88篇
  2003年   91篇
  2002年   68篇
  2001年   56篇
  2000年   47篇
  1999年   32篇
  1998年   24篇
  1997年   22篇
  1996年   9篇
  1995年   10篇
  1994年   8篇
  1993年   8篇
  1992年   20篇
  1991年   31篇
  1990年   27篇
  1989年   27篇
  1988年   37篇
  1987年   26篇
  1986年   21篇
  1985年   27篇
  1984年   11篇
  1983年   12篇
  1980年   6篇
  1979年   22篇
  1978年   21篇
  1977年   6篇
  1976年   6篇
  1973年   5篇
  1970年   4篇
  1969年   10篇
  1968年   5篇
排序方式: 共有3637条查询结果,搜索用时 15 毫秒
51.
Crohn’s Disease (CD) or CD-like (CDL) conditions of the pouch are rare long-term inflammatory complications of patients who were initially diagnosed with ulcerative colitis (UC) who undergo total proctocolectomy with ileo-anal anastomosis (IPAA). There are no societal guidelines nor a consensus on their treatment, resulting in significant challenges for clinicians for their diagnosis and management. It is important to differentiate them from other more common pouch-related complications like pouchitis, cuffitis, irritable pouch syndrome, surgery associated stricture, and fistula. In this review, we focus on the less common presentation of CD and CDL conditions of the pouch and their treatment with the use of anti-TNF therapy with or without immunomodulator.  相似文献   
52.
ABSTRACT

Trifolium repens. L. is an herbal plant that is used in the folk medicine of the Naga tribes of India as a deworming remedy. This study deals with evaluating its anticestodal activity using experimental Hymenolepis diminuta. Rudolphi infections in albino rats. Doses of T. repens. aerial shoots extract 200 and 500?mg/kg reduced the mean fecal egg counts of H. diminuta. by 47.72% and 54.59% and worm recovery rate by 60.00% and 40.00%, respectively. Praziquantel, the standard cestocidal drug, reduced the mean fecal egg count by 65.90% and worm recovery rate by 26.67%. The study suggests that the aerial shoots of T. repens. bear anticestodal properties and supports its use in the traditional medicine system.  相似文献   
53.
Rheumatic valvular affection is not an uncommon disease especially in the developing nations, but its association with dextrocardia is relatively rare. In the present day scenario, where mitral valve replacements far exceed the number of closed commissurotomies, a sound understanding of the anatomy, approach, and technique is vital vis-à-vis surgical management of these patients who do not have the finances for replacement of a severely stenotic valve or patients who may present in extremis. We present a case series of three such patients who underwent successful closed commissurotomies.  相似文献   
54.
55.
Diltiazem has been extensively studied in the treatment of chronic anal fissures, but efficacy in clinical practice is not fully established. The aim of the present study was to evaluate the safety and efficacy of topical application diltiazem in observational studies as well as in controlled clinical trials in the treatment of chronic anal fissures. A systematic literature search was carried out from 1966 to 31 December, 2007 on PubMed, Medline, Embase and Cochrane database, using the appropriate search words. We found six observational studies with 392 patients and five controlled clinical trials with 289 patients in which topical diltiazem treatment was given. Efficacy was found to be very high in observational studies (56.88%), whereas it was found to be modest in controlled clinical trials (29.41%). In observational studies, most of the patients reported complete healing of fissures within 6–12 weeks, whereas in controlled trials healing was reported within 8 weeks, with tolerable adverse effects of diltiazem. On the basis of the above studies, it can be concluded that topical application of diltiazem is useful in the treatment of chronic anal fissure, but to fully establish its efficacy, larger prospective double-blind study is required in the near future.  相似文献   
56.
Mycobacterium immunogenum and Mycobacterium chelonae are closely related species associated with occupational hypersensitivity pneumonitis (HP) and nosocomial infections. There is a need to develop specific and readily adaptable methods for detection and speciation of these agents. Here we report development of a probe-based colorimetric-PCR assay involving heat shock protein (hsp) gene amplification (228bp) and its detection in an ELISA-like reaction. A quantitative format of this assay was developed and validated on metalworking fluids (MWF). The assay showed a minimum detection limit of 10 fg genomic DNA or 1 mycobacterial cell, albeit with variations depending on type and composition of the MWF matrix. When applied to the field MWF samples, the developed assay was found to be comparable to the real-time PCR assay, and allowed direct speciation of MWF mycobacteria without sequencing and/or restriction pattern analysis. In conclusion, the developed colorimetric PCR allows detection and quantification of MWF mycobacteria without culturing and is the first probe-based assay for unambiguous differentiation between the two phylogenetically closely related species, M. immunogenum and M. chelonae. Considering that the assay offers high throughput format involving relatively simpler instrument infrastructure, it has a potential for applications in routine assessment of MWF mycobacteria in diagnostic and industrial laboratories.  相似文献   
57.
58.
59.
60.
ObjectiveThe study aimed at to find out prevalence of abnormal upper limb arterial anatomy and its correlation with access failure during transradial coronary angiography.MethodThis was a prospective observational study of 1512 patients who had undergone transradial coronary angiography (CAG). Angiographic assessment of upper limb arterial tree was performed when the angiographic guidewire or the diagnostic catheter followed an abnormal path or got stuck in its course.ResultsAbout 5.29% patients (80/1512) were noted to have abnormal upper limb arterial anatomy. The most common abnormality detected were radio-ulnar loop in 22 (1.46%) patients, tortuous upper limb arteries 19 (1.25%) and abnormal high origin of radial artery 10 (0.66%) patients. Access failure was encountered in 4.4% (67/1512) of total patients and 64.17% (43/67) access failure was due to abnormal upper limb arterial anatomy.ConclusionAbnormal upper limb arterial anatomy was the most common cause of access failure in transradial coronary angiography in this study.  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