全文获取类型
收费全文 | 3553篇 |
免费 | 294篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 45篇 |
儿科学 | 117篇 |
妇产科学 | 54篇 |
基础医学 | 562篇 |
口腔科学 | 41篇 |
临床医学 | 438篇 |
内科学 | 667篇 |
皮肤病学 | 66篇 |
神经病学 | 307篇 |
特种医学 | 74篇 |
外科学 | 483篇 |
综合类 | 26篇 |
一般理论 | 2篇 |
预防医学 | 436篇 |
眼科学 | 103篇 |
药学 | 208篇 |
中国医学 | 7篇 |
肿瘤学 | 218篇 |
出版年
2023年 | 43篇 |
2022年 | 63篇 |
2021年 | 153篇 |
2020年 | 100篇 |
2019年 | 149篇 |
2018年 | 146篇 |
2017年 | 107篇 |
2016年 | 102篇 |
2015年 | 115篇 |
2014年 | 177篇 |
2013年 | 220篇 |
2012年 | 318篇 |
2011年 | 300篇 |
2010年 | 148篇 |
2009年 | 117篇 |
2008年 | 179篇 |
2007年 | 192篇 |
2006年 | 164篇 |
2005年 | 139篇 |
2004年 | 128篇 |
2003年 | 114篇 |
2002年 | 114篇 |
2001年 | 50篇 |
2000年 | 64篇 |
1999年 | 36篇 |
1998年 | 28篇 |
1997年 | 22篇 |
1996年 | 14篇 |
1995年 | 17篇 |
1994年 | 12篇 |
1993年 | 10篇 |
1992年 | 32篇 |
1991年 | 16篇 |
1990年 | 11篇 |
1989年 | 21篇 |
1988年 | 26篇 |
1987年 | 18篇 |
1986年 | 14篇 |
1985年 | 26篇 |
1984年 | 13篇 |
1983年 | 14篇 |
1982年 | 10篇 |
1981年 | 11篇 |
1979年 | 15篇 |
1977年 | 6篇 |
1976年 | 8篇 |
1974年 | 11篇 |
1973年 | 7篇 |
1969年 | 6篇 |
1966年 | 6篇 |
排序方式: 共有3854条查询结果,搜索用时 15 毫秒
31.
32.
Ventolini G Neiger R Mathews L Adragna N Belcastro M 《American journal of perinatology》2008,25(2):79-83
We studied the effect of antenatal corticosteroids on the incidence of respiratory disorders in singleton neonates born between 34 and 36 weeks of gestation. Retrospective analysis was conducted of the incidence of respiratory distress syndrome (RDS) and other respiratory disorders (need for mechanical ventilation, continuous positive airway pressure, and prolonged oxygen therapy) among singleton neonates delivered between 34 and 36 weeks of gestation who were exposed to antenatal corticosteroids, compared with neonates who were not exposed. Statistical analyses included two-tailed T tests, two-way analysis of variance for continuous data, and chi-square analysis for ratios. A probability of 0.05 was considered significant. Between January 1, 2000, and December 31, 2004, 1078 neonates were born between 34 and 36 weeks of gestation. Information regarding antenatal corticosteroids was available in 1044: 574 neonates (53.2%) were exposed to antenatal corticosteroids and 470 (43.6%) were not. One thousand and eighteen neonates were admitted to the neonatal intensive care unit. Respiratory disorders were diagnosed in 140 of those exposed to antenatal steroids (24.4%) and in 382 of the nonexposed (81.3%) ( P < 0.0001). Two hundred and ten neonates (20.6%) developed RDS: Of those, 43 were exposed to antenatal corticosteroids and 167 were not (incidence of RDS was 7.5% and 35.5%, respectively; P = 0.0001). The beneficial effects of corticosteroids were similar in both genders. It appears that the exposure of singleton pregnancies to antenatal corticosteroids between 24 and 34 weeks of gestation is associated with a significantly lower incidence of respiratory disorders among neonates born at 34 to 36 weeks of gestation. Further studies are needed to determine whether administering antenatal steroids to women experiencing preterm labor after 34 weeks of gestation would be associated with a similar beneficial effect. 相似文献
33.
Prevalence and Contributors to Low‐grade Inflammation in Three U.S. Populations of Reproductive Age Women 下载免费PDF全文
34.
35.
Amanda Reiff Metz Matthew Bauer Chelsey Epperly Ginger Stringer Kristen E. Marshall Lindsey Martin Webb Molly Hetherington-Rauth Shannon R. Matzinger Sarah Elizabeth Totten Emily A. Travanty Kristen M. Good Alexis Burakoff 《Emerging infectious diseases》2022,28(8):1551
A COVID-19 outbreak occurred among Cameron Peak Fire responders in Colorado, USA, during August 2020–January 2021. The Cameron Peak Fire was the largest recorded wildfire in Colorado history, lasting August–December 2020. At least 6,123 responders were involved, including 1,260 firefighters in 63 crews who mobilized to the fire camps. A total of 79 COVID-19 cases were identified among responders, and 273 close contacts were quarantined. State and local public health investigated the outbreak and coordinated with wildfire management teams to prevent disease spread. We performed whole-genome sequencing and applied social network analysis to visualize clusters and transmission dynamics. Phylogenetic analysis identified 8 lineages among sequenced specimens, implying multiple introductions. Social network analysis identified spread between and within crews. Strategies such as implementing symptom screening and testing of arriving responders, educating responders about overlapping symptoms of smoke inhalation and COVID-19, improving physical distancing of crews, and encouraging vaccinations are recommended. 相似文献
36.
The association of differing measures of overweight and obesity with prevalent atherosclerosis: the Dallas Heart Study. 总被引:1,自引:0,他引:1
Raphael See Shuaib M Abdullah Darren K McGuire Amit Khera Mahesh J Patel Jason B Lindsey Scott M Grundy James A de Lemos 《Journal of the American College of Cardiology》2007,50(8):752-759
OBJECTIVES: This study sought to evaluate the associations between different measures of obesity and prevalent atherosclerosis in a large population-based cohort. BACKGROUND: Although obesity is associated with cardiovascular mortality, it is unclear whether this relationship is mediated by increased atherosclerotic burden. METHODS: Using data from the Dallas Heart Study, we assessed the association between gender-specific obesity measures (i.e., body mass index [BMI]; waist circumference [WC]; waist-to-hip ratio [WHR]) and prevalent atherosclerosis defined as coronary artery calcium (CAC) score >10 Agatston units measured by electron-beam computed tomography and detectable aortic plaque measured by magnetic resonance imaging. RESULTS: In univariable analyses (n = 2,744), CAC prevalence was significantly greater only in the fifth versus first quintile of BMI, whereas it increased stepwise across quintiles of WC and WHR (p trend <0.001 for each). After multivariable adjustment for standard risk factors, prevalent CAC was more frequent in the fifth versus first quintile of WHR (odds ratio 1.91, 95% confidence interval 1.30 to 2.80), whereas no independent positive association was observed for BMI or WC. Similar results were observed for aortic plaque in both univariable and multivariable-adjusted analyses. The c-statistic for discrimination of prevalent CAC was greater for WHR compared with BMI and WC in women and men (p < 0.001 vs. BMI; p < 0.01 vs. WC). CONCLUSIONS: We discovered that WHR was independently associated with prevalent atherosclerosis and provided better discrimination than either BMI or WC. The associations between obesity measurements and atherosclerosis mirror those observed between obesity and cardiovascular mortality, suggesting that obesity contributes to cardiovascular mortality via increased atherosclerotic burden. 相似文献
37.
Raad Mohamad Gorgis Sarah Abshire Chelsea Yost Monica Dabbagh Mohammed F Chehab Omar Aurora Lindsey Patel Sati Nona Paul Yan Jerry Singh Gurjit Syrjamaki John Kaatz Scott Parikh Sachin 《Journal of thrombosis and thrombolysis》2022,53(3):567-575
Journal of Thrombosis and Thrombolysis - Although certain risk factors have been associated with morbidity and mortality, validated emergency department (ED) derived risk prediction models specific... 相似文献
38.
39.
Areeba Kara Deborah DeMeester Lindsey Lazo Emily Cook Susan Hendricks 《Journal of interprofessional care》2018,32(4):513-516
Interprofessional collaboration is fundamental to providing optimal patient care. The readiness of the team entering a framework of interprofessional collaborative practice is critical to its success. In this study, we conducted an interprofessional education (IPE) activity for medical and nursing students in an acute care setting. Over nine occasions, 21 student pairs (one nursing and one medical student per pair) jointly assessed a patient and created a list of problems and interventions to achieve the patient’s goals. Immediately after the activity, students were debriefed to gain insight into their experiences. Debriefing sessions were audiotaped and analysed using a phenomenological approach and four major themes were identified. Overall, students felt responsible for representing their profession and were initially apprehensive about the interprofessional task. Nevertheless, they identified their own shortcomings and recognized the value in their partner’s approach. These realizations promoted convergence on a shared vision to provide optimal care for patients as a team. Acknowledging and understanding these perceptions may help design better ways to improve patient care. This educational model may be utilized by others who are seeking IPE activities in acute care. 相似文献
40.
Jean B Nachega Olalekan A Uthman Karl Peltzer Lindsey A Richardson Edward J Mills Kofi Amekudzi Alice Ouédraogo 《Bulletin of the World Health Organization》2015,93(1):29-41
ObjectiveTo assess the association between the employment status of human immunodeficiency virus (HIV)-infected individuals and adherence to antiretroviral therapy (ART).MethodsWe searched the Medline, Embase and Cochrane Central Register of Controlled Trials databases for studies reporting ART adherence and employment status published between January 1980 and September 2014. Information from a wide range of other sources, including the grey literature, was also analysed. Two independent reviewers extracted data on treatment adherence and study characteristics. Study data on the association between being employed and adhering to ART were pooled using a random-effects model. Between-study heterogeneity and sources of bias were evaluated.FindingsThe meta-analysis included 28 studies published between 1996 and 2014 that together involved 8743 HIV-infected individuals from 14 countries. The overall pooled odds ratio (OR) for the association between being employed and adhering to ART was 1.27 (95% confidence interval, CI: 1.04–1.55). The association was significant for studies from low-income countries (OR: 1.85, 95% CI: 1.58–2.18) and high-income countries (OR: 1.33, 95% CI: 1.02–1.74) but not middle-income countries (OR: 0.94, 95% CI: 0.62–1.42). In addition, studies published after 2011 and larger studies showed less association between employment and adherence than earlier and small studies, respectively.ConclusionEmployed HIV-infected individuals, particularly those in low- and high-income countries, were more likely to adhere to ART than unemployed individuals. Further research is needed on the mechanisms by which employment and ART adherence affect each other and on whether employment-creation interventions can positively influence ART adherence, HIV disease progression and quality of life. 相似文献