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   11320篇
  免费   1263篇
  国内免费   147篇
耳鼻咽喉   76篇
儿科学   253篇
妇产科学   183篇
基础医学   627篇
口腔科学   568篇
临床医学   1748篇
内科学   1431篇
皮肤病学   179篇
神经病学   500篇
特种医学   191篇
外科学   671篇
综合类   1328篇
现状与发展   1篇
一般理论   1篇
预防医学   3427篇
眼科学   221篇
药学   716篇
  23篇
中国医学   354篇
肿瘤学   232篇
  2024年   8篇
  2023年   213篇
  2022年   227篇
  2021年   503篇
  2020年   531篇
  2019年   453篇
  2018年   443篇
  2017年   445篇
  2016年   406篇
  2015年   411篇
  2014年   817篇
  2013年   1005篇
  2012年   794篇
  2011年   800篇
  2010年   647篇
  2009年   630篇
  2008年   628篇
  2007年   634篇
  2006年   536篇
  2005年   429篇
  2004年   296篇
  2003年   257篇
  2002年   208篇
  2001年   187篇
  2000年   139篇
  1999年   100篇
  1998年   110篇
  1997年   119篇
  1996年   93篇
  1995年   68篇
  1994年   93篇
  1993年   76篇
  1992年   65篇
  1991年   58篇
  1990年   40篇
  1989年   32篇
  1988年   46篇
  1987年   31篇
  1986年   22篇
  1985年   28篇
  1984年   14篇
  1983年   9篇
  1982年   16篇
  1981年   14篇
  1980年   8篇
  1979年   9篇
  1978年   12篇
  1977年   6篇
  1976年   6篇
  1975年   3篇
排序方式: 共有10000条查询结果,搜索用时 16 毫秒
11.
Despite the existence of endemic mycoses in Latin America and the Caribbean, in addition to a large population of patients at risk for invasive mycoses, the capability of medical centres to perform a proper diagnosis in mycology has not been studied in the region. Moreover, availability of antifungal drugs in the region is unknown. Here, we report the results of a survey involving 129 centres in 24 countries. Only 9% of centres would have the potential to apply for the minimum standards in mycology, as determined by the European Confederation of Medical Mycology. There is an urgent need to improve diagnostic conditions in Latin America and the Caribbean, as well as providing access to safer and more efficacious antifungal drugs.  相似文献   
12.
ObjectiveIdentify factors associated with healthcare providers' frequency of depot medroxyprogesterone acetate (DMPA) provision to adolescents.Study designWe analyzed data from surveys mailed to a nationally representative sample of public-sector providers and office-based physicians (n=1984). We estimated adjusted odds ratios (aORs) and 95% confidence intervals (CIs) of factors associated with frequent DMPA provision to adolescents in the past year.ResultsAlthough most providers (>95%) considered DMPA safe for adolescents, fewer reported frequent provision (89% of public-sector providers; 64% of office-based physicians). Among public-sector providers, factors associated with lower odds of frequent provision included working in settings without Title X funding (aOR 0.44, 95% CI 0.30–0.64), reporting primary care as their primary clinical focus versus reproductive or adolescent health (aOR 0.42, 95% CI 0.28–0.61), and providing fewer patients with family planning services. Among office-based physicians, factors associated with lower odds of frequent provision included specializing in obstetrics/gynecology (aOR 0.50, 95% CI 0.27–0.91) and family medicine (aOR 0.21, 95% CI 0.09–0.47) versus adolescent medicine, completing training ≥15 versus <5 years ago (aOR 0.27, 95% CI 0.09–0.83), and reporting that 0–24% of patients pay with Medicaid or other government healthcare assistance versus ≥50% (aOR 0.23, 95% CI 0.09–0.61). The reason most commonly reported by providers for infrequent DMPA provision was patient preference for another method.ConclusionsWhile most providers reported frequently providing DMPA to adolescents, training on evidence-based recommendations for contraception, focused on subgroups of providers with lower odds of frequent DMPA provision, may increase adolescents' access to contraception.ImplicationsAlthough >95% of providers considered depot medroxyprogesterone (DMPA) a safe contraceptive for adolescents, only 89% of public-sector providers and 64% of office-based physicians reported frequently providing DMPA to adolescents. Provider training on evidence-based recommendations for contraception counseling and provision may increase adolescents' access to DMPA and all methods of contraception.  相似文献   
13.
14.
15.
16.
BackgroundMetabolic syndrome (MetS) is related to the increased risk of major cardiovascular diseases (CVD). The link between high serum total bilirubin (TBL) is cross-sectionally related to MetS and its components. However, whether serum TBL predicts incidence of MetS and its components remains inconclusive.MethodsThe present study included 893 women aged 70 ± 9 years from a rural village. We examined the relationship between serum TBL and MetS based on the modified criteria of the National Cholesterol Education Program's Adult Treatment Panel (NCEP-ATP) III report in a cross-sectional (N = 893) and cohort (N = 288) data.ResultsIn the cross-sectional study, serum TBL (β = 0.536, p < 0.001) as well as age, alcohol consumption, exercise habits, history of CVD, SUA, GGT, and ALT was significantly and dependently associated with number of MetS components, but in the cohort study serum TBL was not associated with number of MetS components. Compared with the 1st tertile of serum TBL (0.20–0.55 mg/dL), multivariate-adjusted odds ratio (95% confidence interval) for the 2nd -3rd tertiles of serum TBL (0.54–2.00 mg/dL) was 0.70 (0.51–0.95) in the cross-sectional study and 0.41 (0.21–0.81) in the cohort study.ConclusionsOur data demonstrated an independently negative association between serum TBL and MetS in Japanese community-dwelling women.  相似文献   
17.
目的 了解江苏地区精神专科医院临床女护士主观幸福感的现状及影响因素,为提高精神专科医院的管理水平提供参考依据。方法 采用中文版的“总体幸福感量表”和自制的“一般情况调查表”对江苏省不同地区的6所精神专科医院1260名女护士进行调查。 结果 被调查对象主观幸福感前18项总分为(67.89±14.09)分,处于中等幸福感49~72分之间,但显著低于全国女性常模(71.00±18.00)分,两者比较,t =-2.768,差异有统计学意义(P<0.01);经回归分析,其主要影响因素有对职业伤害的担心程度、家庭的支持程度、收入状况、医院支持系统的满意度,差异均有统计学意义(P<0.01或P<0.05)。结论 江苏地区的精神科女护士主观幸福感总体处于中等水平但显著低于全国女性常模,提高其主观幸福感可以从减少精神科护士的职业伤害、关注家庭方面影响、建立合理的薪酬体系和高效的医院支持系统4个方面努力。  相似文献   
18.
19.
In the work described here, our aim was to determine, in an elderly population, changes in muscle thickness (MT), cross-sectional area (CSA) and echo intensity (EI) of the quadriceps muscles at four time points (0, 5, 10 and 15 min; i.e., T0, T5, T10 and T15, respectively) after changing from a standing to supine position. Twenty-one elderly participants (14 men: 68.1 ± 4.6 y; 8 women: 66.8 ± 4.1 y) were evaluated at four time points. Rectus femoris CSA (RFCSA), MT and EI of the quadriceps femoris (QF) muscles were assessed. EI significantly increased from T0 to T5, T10 and T15 (p < 0.001), whereas no differences were observed between T5 and T15 in the rectus femoris (RFEI), vastus intermedius (VIEI) and quadriceps femoris (QFEI). No differences were observed between any time points in the RFCSA and MT of QF muscles. In summary, these results suggest that periods >5 min are not necessary to obtain consistent MT and EI measurements of quadriceps femoris muscles in the elderly population.  相似文献   
20.
This article examines the self‐rated health, symptoms and health behaviour of upper secondary vocational students in Finland. The data consist of the responses of first‐ and second‐year vocational students (n = 34 554) to the 2013 School Health Promotion Survey. The data were analysed statistically and processed separately for girls and boys. Associations between self‐rated health, symptoms and health behaviour and fields of study were examined by cross‐tabulation. Statistical significance was measured using the chi‐squared test. Self‐rated health, symptoms and health behaviour were found to have a statistically significant association with field of study (p < 0.001). Vocational students in different fields had different experiences of health, different symptoms and different health behaviours. The results complement existing evidence about disparities in well‐being among young people in the context of education.  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