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   19386篇
  免费   1005篇
  国内免费   22篇
耳鼻咽喉   284篇
儿科学   590篇
妇产科学   908篇
基础医学   2675篇
口腔科学   419篇
临床医学   1192篇
内科学   5299篇
皮肤病学   484篇
神经病学   1231篇
特种医学   417篇
外科学   2639篇
综合类   51篇
一般理论   3篇
预防医学   1729篇
眼科学   308篇
药学   1266篇
中国医学   97篇
肿瘤学   821篇
  2023年   59篇
  2022年   91篇
  2021年   271篇
  2020年   163篇
  2019年   331篇
  2018年   363篇
  2017年   260篇
  2016年   266篇
  2015年   302篇
  2014年   375篇
  2013年   505篇
  2012年   1223篇
  2011年   1595篇
  2010年   647篇
  2009年   430篇
  2008年   1170篇
  2007年   1340篇
  2006年   1415篇
  2005年   1304篇
  2004年   1392篇
  2003年   1238篇
  2002年   1265篇
  2001年   886篇
  2000年   1162篇
  1999年   733篇
  1998年   103篇
  1997年   69篇
  1996年   65篇
  1995年   59篇
  1994年   51篇
  1993年   43篇
  1992年   150篇
  1991年   132篇
  1990年   116篇
  1989年   111篇
  1988年   67篇
  1987年   66篇
  1986年   57篇
  1985年   64篇
  1984年   45篇
  1983年   32篇
  1979年   30篇
  1975年   22篇
  1974年   25篇
  1973年   27篇
  1972年   25篇
  1971年   27篇
  1970年   23篇
  1969年   23篇
  1967年   23篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
We report on a 3‐year‐old girl with a microvesicular generalized rash in whom primary infection by parvovirus B19 was demonstrated by seroconversion. To our knowledge, this is the first instance of an eruption arising from parvovirus B19 with this peculiar clinical pattern.  相似文献   
4.
5.
6.
7.
8.
Abstract

The occupational hazards and respiratory symptoms of domestic cleaners in USA are largely unknown. We conducted a cross-sectional study among 56 Hispanic female domestic cleaner on their health status and frequency of cleaning products used and tasks performed. While women used multi-use products (60.0%) and toilet bowl cleaners (51.8%) most days of the week, many (39.3%) reported not using personal protective equipment while cleaning. Itchy/watery eyes (61.8%) and itchy nose (56.4%) were the most frequently reported symptoms. A history of physician-diagnosed asthma was reported by 14.3% while 33.9% had symptoms of bronchial hyperresponsiveness (BHR). In conclusion, this vulnerable population has high prevalence of physician-diagnosis asthma and BHR symptoms and is potentially exposed to myriad occupational hazards. Further research exploring associations between products use, cleaning tasks and respiratory symptoms is warranted.  相似文献   
9.
A retrospective study of 1058 liver transplant recipients was performed to determine: (i) the incidence, etiology, timing, clinical features and treatment of refractory ascites (RA), (ii) risk factors for RA development, (iii) predictors of RA disappearance, (iv) predictors of survival following RA and (v) the impact of RA on patient survival. Sixty-two patients (5.9%) developed RA and its disappearance occurred in 27/62 cases. Patients having hepatitis C virus (HCV) had a significantly higher hazard rate of developing RA (p < 0.00001). No other baseline characteristic was associated with RA. Cox stepwise regression analysis of the hazard rate of RA disappearance found two significant factors: HCV recurrence as the reason for developing RA implied a poorer outcome (p = 0.006), whereas an unknown reason implied a favorable outcome (p = 0.02). In addition, survival following RA was significantly poorer among patients having bacterial peritonitis or HCV recurrence. Finally, the mortality rate was significantly (nearly 8.6 times) higher in patients following RA development while it was ongoing (p < 0.00001); however, if the RA disappeared, then the additional risk of death also disappeared. This study illustrates the importance of developing an optimal treatment strategy to (i) effectively treat RA if it develops and (ii) prevent hepatitis C recurrence.  相似文献   
10.
SETTING: Tuberculosis (TB) cases reported from nine districts of Madrid, where the percentage of immigrant population varied from 1.9% in 1996 to 12.2% in 2003. OBJECTIVE: To describe the trends in TB incidence from 1994 to 2003. DESIGN: Observational study. RESULTS: Between 1994-1995 and 2002-2003, the TB rate decreased from 48.5 (95% CI 45.8-51.1) to 23.3 per 100000 population (95% CI 21.5-25.1) (P < 0.001). The percentage of TB cases co-infected with HIV decreased from 55.9% in 1994 to 14.3% in 2003 (P < 0.001), whereas TB cases in foreigners increased from 2.6% in 1994 to 33.7% in 2003 (P < 0.001). CONCLUSION: Although the TB rates showed a marked decrease in the study period, the increasing impact of immigration contributed to slowing down the trend.  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