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   986篇
  免费   62篇
  国内免费   32篇
耳鼻咽喉   3篇
儿科学   63篇
妇产科学   9篇
基础医学   78篇
口腔科学   21篇
临床医学   113篇
内科学   190篇
皮肤病学   12篇
神经病学   18篇
特种医学   130篇
外科学   91篇
综合类   61篇
一般理论   2篇
预防医学   49篇
眼科学   61篇
药学   60篇
肿瘤学   119篇
  2023年   5篇
  2022年   10篇
  2021年   19篇
  2020年   18篇
  2019年   20篇
  2018年   24篇
  2017年   15篇
  2016年   13篇
  2015年   21篇
  2014年   24篇
  2013年   34篇
  2012年   50篇
  2011年   45篇
  2010年   33篇
  2009年   37篇
  2008年   49篇
  2007年   52篇
  2006年   44篇
  2005年   24篇
  2004年   31篇
  2003年   23篇
  2002年   25篇
  2001年   29篇
  2000年   14篇
  1999年   20篇
  1998年   41篇
  1997年   24篇
  1996年   33篇
  1995年   26篇
  1994年   24篇
  1993年   29篇
  1992年   14篇
  1991年   19篇
  1990年   13篇
  1989年   15篇
  1988年   12篇
  1987年   12篇
  1986年   22篇
  1985年   14篇
  1984年   12篇
  1983年   8篇
  1982年   8篇
  1981年   8篇
  1980年   14篇
  1979年   5篇
  1978年   4篇
  1977年   5篇
  1976年   6篇
  1972年   7篇
  1968年   7篇
排序方式: 共有1080条查询结果,搜索用时 20 毫秒
31.
32.
The cribriform morular variant of papillary thyroid carcinoma (CMV-PTC) is a rare morphologic entity that is associated with familial adenomatous polyposis (FAP). We report a case of a young lady with an incidentally discovered right-sided neck nodule on ultrasonography with a diagnosis of CMV-PTC confirmed on thyroidectomy and review the literature associated with the clinical presentation, imaging characteristics, pathological findings and the association with FAP.  相似文献   
33.
34.
Successful visual prostheses require stable, long‐term attachment. Epiretinal prostheses, in particular, require attachment methods to fix the prosthesis onto the retina. The most common method is fixation with a retinal tack; however, tacks cause retinal trauma, and surgical proficiency is important to ensure optimal placement of the prosthesis near the macula. Accordingly, alternate attachment methods are required. In this study, we detail a novel method of magnetic attachment for an epiretinal prosthesis using two prostheses components positioned on opposing sides of the retina. The magnetic attachment technique was piloted in a feline animal model (chronic, nonrecovery implantation). We also detail a new method to reliably control the magnet coupling force using heat. It was found that the force exerted upon the tissue that separates the two components could be minimized as the measured force is proportionately smaller at the working distance. We thus detail, for the first time, a surgical method using customized magnets to position and affix an epiretinal prosthesis on the retina. The position of the epiretinal prosthesis is reliable, and its location on the retina is accurately controlled by the placement of a secondary magnet in the suprachoroidal location. The electrode position above the retina is less than 50 microns at the center of the device, although there were pressure points seen at the two edges due to curvature misalignment. The degree of retinal compression found in this study was unacceptably high; nevertheless, the normal structure of the retina remained intact under the electrodes.  相似文献   
35.
36.
37.
Considering the ageing population in economically advanced regions across the world, measures are necessary to enhance the health of the older population as well as contain public healthcare spending. Hong Kong implements the Elderly Health Care Voucher Scheme (EHCVS), providing older people aged 65 or above an annual subsidy of visiting private healthcare service providers for chronic disease prevention and management. The services also aim at reallocating demand from the public to private sector as well as improve quality of services. This qualitative study explored the experiences of EHCVS recipients (n = 55, aged 61–94) with eight focus group interviews in Hong Kong in the year 2016. Convenience sampling was used. Research questions were: (1) Why do older people choose not to use EHCVS for preventive as well as disease management services among older people in Hong Kong? (2) What are the barriers to reallocating demand from the public to private sector? (3) In what ways did EHCVS improve the quality of primary care services for older people? Using a deductive and inductive approach, eight qualitative themes were identified. Findings suggested that the non‐targeted services and inadequate knowledge on EHCVS deterred older people from using the vouchers for disease management and prevention. The relatively expensive private services, lack of trust in the private sector, low public clinic fees and good services quality of the public sector, together with inadequate private practitioners in the healthcare market were barriers that hinder demand reallocation. Nevertheless, the quality of primary care services had been improved after the implementation of EHCVS with shortened wait times and opportunities to discuss health‐related issues with private practitioners. Findings were discussed with practice, policy and research implications.  相似文献   
38.
BACKGROUND & AIMS: Recent studies have suggested that HLA DRB1*0103 and allele 2 of the interleukin 1 receptor antagonist (IL-1RA) gene predict severe and extensive ulcerative colitis, respectively. The aim of this study was to test these hypotheses in patients undergoing surgery for their colitis. METHODS: HLA DRB1 and DQB1 genotyping was performed in 99 patients and 472 controls. Genotyping for polymorphisms of genes encoding tumor necrosis factor alpha and IL-1RA was performed in 107 patients and 89 controls. Measurement of antineutrophil cytoplasmic antibody (ANCA) was performed in 72 patients and 58 healthy subjects by fixed neutrophil enzyme-linked immunosorbent assay and indirect immunofluorescence. RESULTS: The DRB1*0103 allele was increased in patients (14.1% vs. 3.2% in controls; P < 1 x 10[-5]). This association was greatest in patients with extensive disease (15.8%; P < 0.0001) or extraintestinal manifestations (22.8%; P < 0.0001): mouth ulcers (25.8%; P < 0.0001), arthritis (27.2%; P < 0.0001), and uveitis (35.7%; P < 0.0001). The DRB1*04 alleles were reduced in patients (P = 0.005). Differences were noted between extensive and distal disease in the frequency of allele 2 of IL-1RA (10.9% in distal vs. 28.6% in extensive; P = 0.01) and allele 2 homozygosity. ANCA was detected in 76.4% of patients. Carriage of IL-1RA allele 2 and tumor necrosis factor 2 allele was increased in ANCA-positive patients. CONCLUSIONS: Genetic markers may predict disease behavior in ulcerative colitis. (Gastroenterology 1997 Jun;112(6):1845-53)  相似文献   
39.
40.
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