全文获取类型
收费全文 | 4580篇 |
免费 | 368篇 |
国内免费 | 14篇 |
专业分类
耳鼻咽喉 | 29篇 |
儿科学 | 212篇 |
妇产科学 | 151篇 |
基础医学 | 677篇 |
口腔科学 | 44篇 |
临床医学 | 544篇 |
内科学 | 870篇 |
皮肤病学 | 73篇 |
神经病学 | 435篇 |
特种医学 | 101篇 |
外科学 | 346篇 |
综合类 | 23篇 |
一般理论 | 4篇 |
预防医学 | 549篇 |
眼科学 | 110篇 |
药学 | 376篇 |
中国医学 | 21篇 |
肿瘤学 | 397篇 |
出版年
2023年 | 48篇 |
2022年 | 70篇 |
2021年 | 122篇 |
2020年 | 76篇 |
2019年 | 135篇 |
2018年 | 148篇 |
2017年 | 118篇 |
2016年 | 116篇 |
2015年 | 122篇 |
2014年 | 192篇 |
2013年 | 225篇 |
2012年 | 363篇 |
2011年 | 361篇 |
2010年 | 214篇 |
2009年 | 187篇 |
2008年 | 320篇 |
2007年 | 297篇 |
2006年 | 300篇 |
2005年 | 287篇 |
2004年 | 316篇 |
2003年 | 257篇 |
2002年 | 219篇 |
2001年 | 38篇 |
2000年 | 17篇 |
1999年 | 29篇 |
1998年 | 66篇 |
1997年 | 42篇 |
1996年 | 22篇 |
1995年 | 22篇 |
1994年 | 33篇 |
1993年 | 30篇 |
1992年 | 10篇 |
1991年 | 7篇 |
1990年 | 5篇 |
1989年 | 9篇 |
1988年 | 11篇 |
1987年 | 5篇 |
1986年 | 6篇 |
1984年 | 11篇 |
1983年 | 8篇 |
1982年 | 11篇 |
1980年 | 6篇 |
1979年 | 5篇 |
1978年 | 5篇 |
1977年 | 6篇 |
1975年 | 4篇 |
1974年 | 6篇 |
1973年 | 5篇 |
1934年 | 3篇 |
1923年 | 4篇 |
排序方式: 共有4962条查询结果,搜索用时 15 毫秒
51.
“10年内,世界上最大的国际性医疗集团将产生在中国!”新加坡百汇康护集团私人有限公司副总裁佘伟彦如此预言。 相似文献
52.
Elaine A Merrill Rebecca A Clewell Peter J Robinson Annie M Jarabek Jeffery M Gearhart Teresa R Sterner Jeffrey W Fisher 《Toxicological sciences》2005,83(1):25-43
Detection of perchlorate (ClO4-) in several drinking water sources across the U.S. has lead to public concern over health effects from chronic low-level exposures. Perchlorate inhibits thyroid iodide (I-) uptake at the sodium (Na+)-iodide (I-) symporter (NIS), thereby disrupting the initial stage of thyroid hormone synthesis. A physiologically based pharmacokinetic (PBPK) model was developed to describe the kinetics and distribution of both radioactive I- and cold ClO4- in healthy adult humans and simulates the subsequent inhibition of thyroid uptake of radioactive I- by ClO4-. The model successfully predicts the measured levels of serum and urinary ClO4- from drinking water exposures, ranging from 0.007 to 12 mg ClO4-/kg/day, as well as the subsequent inhibition of thyroid 131I- uptake. Thyroid iodine, as well as total, free, and protein-bound radioactive I- in serum from various tracer studies, are also successfully simulated. This model's parameters, in conjunction with corresponding model parameters established for the male, gestational, and lactating rat, can be used to estimate parameters in a pregnant or lactating human, that have not been or cannot be easily measured to extrapolate dose metrics and correlate observed effects in perchlorate toxicity studies to other human life stages. For example, by applying the adult male rat:adult human ratios of model parameters to those parameters established for the gestational and lactating rat, we can derive a reasonable estimate of corresponding parameters for a gestating or lactating human female. Although thyroid hormones and their regulatory feedback are not incorporated in the model structure, the model's successful prediction of free and bound radioactive I- and perchlorate's interaction with free radioactive I- provide a basis for extending the structure to address the complex hypothalamic-pituitary-thyroid feedback system. In this paper, bound radioactive I- refers to I- incorporated into thyroid hormones or iodinated proteins, which may or may not be bound to plasma proteins. 相似文献
53.
Implementation of the Edmonton Symptom Assessment System for Symptom Distress Screening at a Community Cancer Center: A Pilot Program
下载免费PDF全文
![点击此处可从《The oncologist》网站下载免费的PDF全文](/ch/ext_images/free.gif)
54.
Julie Frre Olga Chatzis Kelly Cremer Joanna Merckx Mathilde De Keukeleire Florence Renard Nathalie Ribesse Frdric Minner Jean Ruelle Benoit Kabamba Hector Rodriguez-Villalobos Bertrand Bearzatto Marie-Luce Delforge Coralie Henin Fabrice Bureau Laurent Gillet Annie Robert Dimitri Van der Linden 《Viruses》2022,14(10)
Schools have been a point of attention during the pandemic, and their closure one of the mitigating measures taken. A better understanding of the dynamics of the transmission of SARS-CoV-2 in elementary education is essential to advise decisionmakers. We conducted an uncontrolled non-interventional prospective study in Belgian French-speaking schools to describe the role of attending asymptomatic children and school staff in the spread of COVID-19 and to estimate the transmission to others. Each participant from selected schools was tested for SARS-CoV-2 using a polymerase chain reaction (PCR) analysis on saliva sample, on a weekly basis, during six consecutive visits. In accordance with recommendations in force at the time, symptomatic individuals were excluded from school, but per the study protocol, being that participants were blinded to PCR results, asymptomatic participants were maintained at school. Among 11 selected schools, 932 pupils and 242 school staff were included between January and May 2021. Overall, 6449 saliva samples were collected, of which 44 came back positive. Most positive samples came from isolated cases. We observed that asymptomatic positive children remaining at school did not lead to increasing numbers of cases or clusters. However, we conducted our study during a period of low prevalence in Belgium. It would be interesting to conduct the same analysis during a high prevalence period. 相似文献
55.
56.
57.
Paul Maurice Conway Annette Erlangsen Matias Brdsgaard Grynderup Thomas Clausen Reiner Rugulies Jakob Bue Bjorner Hermann Burr Laura Francioli Anne Helene Garde se Marie Hansen Linda Magnusson Hanson Jonas Kirchheiner-Rasmussen Tage S Kristensen Eva Gemze Mikkelsen Elsebeth Stenager Sannie Vester Thorsen Ebbe Villadsen Annie Hgh 《Scandinavian journal of work, environment & health》2022,48(6):425
ObjectivesThe aim of this study was to analyze whether individuals reporting exposure to workplace bullying had a higher risk of suicidal behavior, including both suicide attempt and death by suicide, than those not reporting such exposure.MethodsUsing a prospective cohort study design, we linked data from nine Danish questionnaire-based surveys (2004–2014) to national registers up to 31 December 2016. Exposure to workplace bullying was measured by a single item. Suicide attempts were identified in hospital registers and death by suicide in the Cause of Death Register. Among participants with no previous suicide attempts, we estimated hazard ratios (HR) and 95% confidence intervals (CI), adjusting for sex, age, marital status, socioeconomic status, and history of psychiatric morbidity.ResultsThe sample consisted of 98 330 participants (713 798 person-years), 63.6% were women, and the mean age was 44.5 years. Of these participants, 10 259 (10.4%) reported workplace bullying. During a mean follow-up of 7.3 years, we observed 184 cases of suicidal behavior, including 145 suicide attempts, 35 deaths by suicide and 4 cases that died by suicide after surviving a suicide attempt. The fully-adjusted HR for the association between workplace bullying and suicidal behavior was 1.65 (95% CI 1.06–2.58). The HR for suicide attempts and death by suicide were 1.65 (1.09–2.50) and 2.08 (0.82–5.27), respectively. Analyses stratified by sex showed a statistically significant association between workplace bullying and suicidal behavior among men but not women.ConclusionsThe results suggest that exposure to workplace bullying is associated with an elevated risk of suicidal behavior among men. 相似文献
58.
59.