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   4430篇
  免费   295篇
  国内免费   12篇
耳鼻咽喉   17篇
儿科学   159篇
妇产科学   95篇
基础医学   761篇
口腔科学   111篇
临床医学   426篇
内科学   932篇
皮肤病学   89篇
神经病学   488篇
特种医学   101篇
外科学   357篇
综合类   28篇
一般理论   16篇
预防医学   359篇
眼科学   61篇
药学   244篇
中国医学   3篇
肿瘤学   490篇
  2023年   32篇
  2022年   65篇
  2021年   124篇
  2020年   80篇
  2019年   102篇
  2018年   129篇
  2017年   95篇
  2016年   87篇
  2015年   109篇
  2014年   143篇
  2013年   172篇
  2012年   364篇
  2011年   380篇
  2010年   181篇
  2009年   171篇
  2008年   318篇
  2007年   315篇
  2006年   249篇
  2005年   265篇
  2004年   208篇
  2003年   190篇
  2002年   166篇
  2001年   73篇
  2000年   43篇
  1999年   74篇
  1998年   42篇
  1997年   31篇
  1996年   21篇
  1995年   16篇
  1994年   14篇
  1993年   16篇
  1992年   42篇
  1991年   38篇
  1990年   36篇
  1989年   27篇
  1988年   26篇
  1987年   24篇
  1986年   32篇
  1985年   26篇
  1984年   22篇
  1983年   24篇
  1981年   11篇
  1979年   13篇
  1977年   14篇
  1976年   10篇
  1975年   14篇
  1974年   12篇
  1972年   12篇
  1969年   9篇
  1966年   8篇
排序方式: 共有4737条查询结果,搜索用时 15 毫秒
91.
The purpose of this study is to determine the frequency of EBV and CMV DNA detection in saliva of HIV infected and non-HIV individuals and their siblings. The study group comprised 240 individuals. Group 1 comprised of 40 HIV-infected patients, group 2 40 non-HIV individuals, group 3 two siblings for each patient from group 1 (n = 80), and group 4 two siblings for each individual from group 2 (n = 80). Non-stimulated whole saliva was collected, DNA was extracted, and amplification was performed using a nested PCR protocol. EBV and CMV DNA was detected in 7/40 (17.5%) and 5/40 (12.5%) individuals from group 1, 8/40 (20%) and 3/40 (7.5%) from group 2, 11/80 (13.8%) and 2/80 (2.5%) from group 3, and 8/80 (10%) and 1/80 (1.3%) from group 4, respectively. Five (71.4%) out of seven HIV/EBV coinfected individuals of group 1 had a relative also infected with EBV (OR = 11.25, CI [1.75–72.5], p = 0.011). Regarding group 2, among the eight non-HIV and EBV-infected individuals, three (37.5%) had a relative also positive to EBV (p = 0.320). No individual HIV/CMV coinfected had a relative CMV infected (p = 1.00). Also, only one non-HIV and CMV-infected individual had a relative also positive to CMV (p = 0.075). EBV and CMV DNA was detected mainly in those who had HIV viral load counts <400/mL (71%, p = 0.2 and 100%, p = 1, respectively) and those who had CD4 T cells counts between 200 and 400/mm3 (57%, p = 0.544 and 60%, p = 0.249, respectively). HIV-infected individuals and healthy controls showed a similar frequency of viral DNA detection. EBV DNA was significantly amplified in saliva of household members of HIV/EBV coinfected individuals.  相似文献   
92.
93.
Data on the clinical spectrum and therapeutic management of noninfectious mixed cryoglobulinemia vasculitis (CryoVas) in the era of hepatitis C virus screening are lacking. We analyzed data from 242 patients with noninfectious mixed CryoVas included in the French multicenter CryoVas survey. Baseline manifestations were purpura (75%), peripheral neuropathy (52%), arthralgia or arthritis (44%), glomerulonephritis (35%), cutaneous ulcers (16%), and cutaneous necrosis (14%). A connective tissue disease was diagnosed in 30% and B-cell non-Hodgkin lymphoma in 22%, whereas the CryoVas was considered to be essential in 48%. With the use of Cox-marginal structural models, rituximab plus corticosteroids showed the greater therapeutic efficacy compared with corticosteroids alone and alkylating agents plus corticosteroids to achieve complete clinical, renal, and immunologic responses and a prednisone dosage < 10 mg/d at 6 months. However, this regimen was also associated with severe infections, particularly when high doses of corticosteroids were used, whereas death rates did not differ between the therapeutic regimens. The role of each of these strategies remains to be defined in well-designed randomized controlled trials.  相似文献   
94.
95.
96.
97.
98.
99.
This article describes a twinning relationship between the Canadian Association of Midwives (CAM) and the Tanzania Midwives Association (TAMA). It argues that the twinning relationship strengthened both associations. The article briefly reviews the existing literature on professional associations and association strengthening to demonstrate that professional associations are a vital tool for improving the performance of healthcare workers and increasing their capacity to contribute to national and international policy-making. It then suggests that midwifery associations are particularly significant given the frequent professional marginalization of midwives. The article then describes in depth the relationship between CAM and TAMA, highlighting the accomplishments of the twinned partners, and analyzing the factors that contributed to the success of the relationship. The findings demonstrate that twinning can successfully strengthen associations, increasing their ability to support their membership, care for the public, and shape national policy-making. The article therefore proposes twinning as a successful and cost-effective model for encouraging the growth of the midwifery profession.  相似文献   
100.
International Urology and Nephrology - Residual albuminuria is associated with an increased risk of progression to ESKD. We tested whether a supplementation with native vitamin D could reduce...  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