全文获取类型
收费全文 | 3106篇 |
免费 | 263篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 70篇 |
儿科学 | 150篇 |
妇产科学 | 33篇 |
基础医学 | 496篇 |
口腔科学 | 71篇 |
临床医学 | 371篇 |
内科学 | 668篇 |
皮肤病学 | 55篇 |
神经病学 | 246篇 |
特种医学 | 268篇 |
外国民族医学 | 2篇 |
外科学 | 317篇 |
综合类 | 75篇 |
预防医学 | 226篇 |
眼科学 | 28篇 |
药学 | 191篇 |
中国医学 | 1篇 |
肿瘤学 | 113篇 |
出版年
2023年 | 14篇 |
2022年 | 20篇 |
2021年 | 45篇 |
2020年 | 26篇 |
2019年 | 55篇 |
2018年 | 67篇 |
2017年 | 47篇 |
2016年 | 43篇 |
2015年 | 67篇 |
2014年 | 85篇 |
2013年 | 126篇 |
2012年 | 137篇 |
2011年 | 142篇 |
2010年 | 102篇 |
2009年 | 116篇 |
2008年 | 139篇 |
2007年 | 147篇 |
2006年 | 160篇 |
2005年 | 137篇 |
2004年 | 122篇 |
2003年 | 98篇 |
2002年 | 92篇 |
2001年 | 82篇 |
2000年 | 64篇 |
1999年 | 67篇 |
1998年 | 79篇 |
1997年 | 81篇 |
1996年 | 79篇 |
1995年 | 69篇 |
1994年 | 64篇 |
1993年 | 57篇 |
1992年 | 51篇 |
1991年 | 41篇 |
1990年 | 39篇 |
1989年 | 54篇 |
1988年 | 59篇 |
1987年 | 70篇 |
1986年 | 52篇 |
1985年 | 45篇 |
1984年 | 41篇 |
1983年 | 31篇 |
1982年 | 32篇 |
1981年 | 20篇 |
1980年 | 27篇 |
1979年 | 25篇 |
1978年 | 17篇 |
1977年 | 20篇 |
1974年 | 15篇 |
1971年 | 11篇 |
1968年 | 11篇 |
排序方式: 共有3381条查询结果,搜索用时 17 毫秒
62.
63.
64.
65.
Christi S. Ulmer Patrick S. Calhoun Hayden B. Bosworth Michelle F. Dennis Jean C. Beckham 《Behavioral medicine (Washington, D.C.)》2013,39(4):111-121
Women with posttraumatic stress disorder (PTSD) have poor sleep quality and increased risk of cardiovascular disease (CVD). Non-dipping of nocturnal blood pressure may be an explanatory factor for the relationship between sleep and CVD found in previous research. The current study was designed to determine if non-dipping nocturnal blood pressure was associated with trauma exposure, PTSD diagnosis, PTSD symptoms, and sleep quality in a sample of women. Participants completed 24 hours of ABPM and self-report questionnaires. Non-dipping was defined as less than 10% reduction in blood pressure during sleep. The frequency of non-dippers did not differ by diagnostic status (d = .15). However, non-dippers endorsed more traumatic event categories (d = .53), more PTSD hyperarousal symptoms (d = .53), poorer overall sleep quality (d = .59), more frequent use of sleep medication (d = .62), greater sleep-related daytime dysfunction (d = .58), and longer sleep onset latencies (d = .55) than dippers. Increased attention to nocturnal blood pressure variation may be needed to improve blood pressure control in trauma-exposed women. 相似文献
66.
67.
Cassandra R. OLenick Amir Baniassadi Ryan Michael Andrew Monaghan Jennifer Boehnert Xiao Yu Mary H. Hayden Christine Wiedinmyer Kai Zhang Peter J. Crank Jannik Heusinger Paige Hoel David J. Sailor Olga V. Wilhelmi 《Environmental health perspectives》2020,128(12)
Background: Despite the substantial role indoor exposure has played in heat wave–related mortality, few epidemiological studies have examined the health effects of exposure to indoor heat. As a result, knowledge gaps regarding indoor heat–health thresholds, vulnerability, and adaptive capacity persist.Objective: We evaluated the role of indoor heat exposure on mortality and morbidity among the elderly ( of age) in Houston, Texas.Methods: Mortality and emergency hospital admission data were obtained through the Texas Department of State Health Services. Summer indoor heat exposure was modeled at the U.S. Census block group (CBG) level using building energy models, outdoor weather data, and building characteristic data. Indoor heat–health associations were examined using time-stratified case-crossover models, controlling for temporal trends and meteorology, and matching on CBG of residence, year, month, and weekday of the adverse health event. Separate models were fitted for three indoor exposure metrics, for individual lag days 0–6, and for 3-d moving averages (lag 0–2). Effect measure modification was explored via stratification on individual- and area-level vulnerability factors.Results: We estimated positive associations between short-term changes in indoor heat exposure and cause-specific mortality and morbidity [e.g., circulatory deaths, (95% CI: 1.03, 1.30)]. Associations were generally positive for earlier lag periods and weaker across later lag periods. Stratified analyses suggest stronger associations between indoor heat and emergency hospital admissions among African Americans compared with Whites.Discussion: Findings suggest excess mortality among certain elderly populations in Houston who are likely exposed to high indoor heat. We developed a novel methodology to estimate indoor heat exposure that can be adapted to other U.S. locations. In locations with high air conditioning prevalence, simplified modeling approaches may adequately account for indoor heat exposure in vulnerable neighborhoods. Accounting for indoor heat exposure may improve the estimation of the total impact of heat on health. https://doi.org/10.1289/EHP6340 相似文献
68.
David Lowe Shazia Shabir John Buckels Paolo Muiesan Geoffrey Hayden Andrew Holt Ahmed Hamsho Kassi Skordilis Graham Lipkin Richard Borrows David Briggs 《Transplant immunology》2014,30(1):30-33
This case report confirms the utility of simultaneous liver transplantation in allowing successful kidney transplantation in the face of preformed, high levels of DSA, which would under normal circumstances be associated with hyperacute rejection and kidney graft failure. Antibody characterisation in terms of epitope specificity is more accurate and informative than antibodies described as “antigen-specific” and we suggest a method for identifying and tracking these antibodies; i.e. follow the epitope reaction not the antigen reactions. We consider that this will give a better insight into the behaviour and pathogenicity of HLA-specific sera. In the case presented here this approach has revealed some novel features of the post transplant antibody response in a sensitised recipient. These illustrate three phenomena which challenge current dogmas; an early resynthesis of DSA does not necessarily cause AMR, high levels of DSA can spontaneously modulate, and measurement of antibodies in terms of antigen specificity can give misleading results. 相似文献
69.
Objective: To determine (a) the prevalence of complementary and alternative medicine (CAM) use among people with asthma, and (b) if comorbid chronic disease and asthma severity are associated with CAM use. Methods: This cross-sectional study utilized data from n?=?15?276 adults who participated in the 2009 Behavioral Risk Factor Surveillance System (BRFSS) and the 2009 Asthma Callback Survey (ACBS). Binary Logistic regression was used to determine if comorbid disease and asthma severity were associated with CAM use (yes/no). Model covariates were age, sex, income, and education. Results: About 26% of respondents report using at least one form of CAM. The most frequently reported form of CAM use is breathing exercises (19.8%). The results indicate that neither comorbid cardiovascular disease, diabetes, nor stroke are related to CAM use, but individuals with more severe asthma symptoms were more likely to use CAM (OR?=?1.05, 95% CI 1.04, 1.05). Conclusions: CAM remedies most often reported by people with asthma (breathing techniques, vitamins) are unlikely to pose safety risks. Comorbid chronic disease does not motivate people with asthma to seek unconventional remedies. The increase in CAM use with asthma severity prompts questions about factors that might drive this behavior, such as untreated/inadequately treated disease, or medication side effects. 相似文献
70.