全文获取类型
收费全文 | 41509篇 |
免费 | 4321篇 |
国内免费 | 593篇 |
专业分类
耳鼻咽喉 | 332篇 |
儿科学 | 2440篇 |
妇产科学 | 556篇 |
基础医学 | 4294篇 |
口腔科学 | 631篇 |
临床医学 | 3826篇 |
内科学 | 4426篇 |
皮肤病学 | 301篇 |
神经病学 | 14841篇 |
特种医学 | 522篇 |
外科学 | 1748篇 |
综合类 | 3363篇 |
现状与发展 | 5篇 |
一般理论 | 2篇 |
预防医学 | 3635篇 |
眼科学 | 179篇 |
药学 | 3611篇 |
10篇 | |
中国医学 | 1241篇 |
肿瘤学 | 460篇 |
出版年
2024年 | 59篇 |
2023年 | 1020篇 |
2022年 | 1171篇 |
2021年 | 2169篇 |
2020年 | 2121篇 |
2019年 | 2035篇 |
2018年 | 1870篇 |
2017年 | 1932篇 |
2016年 | 1971篇 |
2015年 | 1836篇 |
2014年 | 2849篇 |
2013年 | 4060篇 |
2012年 | 2253篇 |
2011年 | 2706篇 |
2010年 | 2092篇 |
2009年 | 2027篇 |
2008年 | 2112篇 |
2007年 | 1988篇 |
2006年 | 1573篇 |
2005年 | 1313篇 |
2004年 | 1023篇 |
2003年 | 918篇 |
2002年 | 799篇 |
2001年 | 578篇 |
2000年 | 459篇 |
1999年 | 388篇 |
1998年 | 360篇 |
1997年 | 290篇 |
1996年 | 237篇 |
1995年 | 238篇 |
1994年 | 201篇 |
1993年 | 199篇 |
1992年 | 191篇 |
1991年 | 178篇 |
1990年 | 157篇 |
1989年 | 157篇 |
1988年 | 132篇 |
1987年 | 103篇 |
1986年 | 72篇 |
1985年 | 120篇 |
1984年 | 93篇 |
1983年 | 63篇 |
1982年 | 85篇 |
1981年 | 55篇 |
1980年 | 41篇 |
1979年 | 27篇 |
1978年 | 29篇 |
1977年 | 20篇 |
1976年 | 13篇 |
1974年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
BackgroundThe positive effect of a father’s involvement in children’s upbringing is now recognised. However, research on fathers raising children with autism spectrum disorder (ASD) are still few. This study examines the relationship between the perception, fathers of children with ASD have of the importance of their role in the development of their children and the feelings (self-efficacy, caregiving burden, satisfaction) they express about their parenting experience.MethodSixty-three Swiss Italian fathers of children with ASD completed The Role of the Father Questionnaire (ROFQ), three sub-scales of the Caregiver Survey, a subtest of the Child Adjustment and Parent Efficacy Scale and a home-made questionnaire measuring Perceived Social Support.ResultsThe results from hierarchical multiple regression analyses show that the importance that fathers attach to the paternal role predicts positively their caregiving satisfaction and their feeling of self-efficacy. The children’s challenging behaviours predict positively the caregiving burden whereas the assessment of social support predicts it negatively.ConclusionsThe perception of the importance of the paternal role needs to be considered in the support offered to families with a child with ASD. A better understanding of the fathers’ feelings could be of value for the programmes. 相似文献
64.
Cognitive and functional brain alterations can occur in children with prenatal alcohol exposure (PAE). We examined the functional connectivity (FC) among regions within and between attention networks, and whether inter- and intranetwork FC moderated cognition in children with PAE (n = 37; age 12.8 ± 2.8 years) and nonexposed controls (n = 40; age 13.2 ± 2.8 years). Participants completed standardized attention and executive functioning tasks and resting state functional MRI. Inter- and intra-network FC and graph-theoretical metrics were calculated among attention network regions. Relative to controls, PAE was associated with reduced FC between the left temporoparietal junction and left ventral frontal cortex and anterior insula/frontal operculum (aI/fO), and between the left intraparietal sulcus and bilateral aI/fO. PAE was associated with increased FC between the right precuneus and intraparietal lobes, the right anterior prefrontal cortex and left ventral frontal cortex and aI/fO, and the left thalamus and dorsal frontal cortex. Graph-theoretical metrics did not differ by group. FC predicted cognitive performance, negatively in the children with PAE and positively in controls. Increased intra-network together with reduced internetwork FC suggests inefficient network specialization and impaired long-range FC among attention network regions after PAE. Results further suggest that those alterations may underlie attention and executive dysfunction in children with PAE. 相似文献
65.
孤独症谱系障碍是一种患病率日益增长的神经发育综合征,可出现多种行为障碍。近年来,重复经颅磁刺激在孤独症谱系障碍治疗中取得了一些研究成果,但关于刺激参数选择、安全性及可行性评估方面仍存在一定争议。本文就其关于诱导长时程增强/抑制、调节皮质抑制的治疗机制、低频和高频经颅磁刺激的临床应用及目前涉及的安全性、道德伦理问题等局限性进行综述,从而为今后的研究与临床应用提供一定的参考依据。 相似文献
66.
67.
Praerna H. Bhargav Preethi V. Reddy Ramajayam Govindaraj Kankan Gulati Arya Ravindran D. Gayathri Sneha J. Karmani Kaviraja Udupa Ganesan Venkatasubramanian Mariamma Philip Monojit Debnath Rose Dawn Bharath T. N. Sathyaprabha Bangalore N. Gangadhar Kesavan Muralidharan 《Revue canadienne de psychiatrie》2021,66(2):179
68.
《Sleep medicine》2021
BackgroundObstructive sleep apnea (OSA) is the most prevalent sleep-related breathing disorder which could impair someone's quality of life and is also associated with poor outcomes from many diseases. Currently, the evidence regarding the link between OSA and coronavirus disease 2019 (COVID-19) is still conflicting. This study aims to analyze the relationship between OSA and poor outcomes of COVID-19.Materials and methodsWe systematically searched the PubMed and Europe PMC database using specific keywords related to our aims until December 10th, 2020. All articles published on COVID-19 and OSA were retrieved. The quality of the study was assessed using the Newcastle–Ottawa Scale (NOS) tool for observational studies. Statistical analysis was done using Review Manager 5.4 software.ResultsA total of 21 studies with 54,276 COVID-19 patients were included in this meta-analysis. This meta-analysis showed that OSA was associated with composite poor outcome [OR 1.72 (95% CI 1.55–1.91), p < 0.00001, I2 = 36%, random-effect modeling] and its subgroup which comprised of severe COVID-19 [OR 1.70 (95% CI 1.18–2.45), p = 0.005], ICU admissions [OR 1.76 (95% CI 1.51–2.05), p < 0.00001], the need for mechanical ventilation [OR 1.67 (95% CI 1.48–1.88), p < 0.00001], and mortality [OR 1.74 (95% CI 1.39–2.19), p < 0.00001].ConclusionsExtra care and close monitoring should be provided to patients with OSA to minimize the risk of infections. Simple questionnaires such as STOP-Bang questionnaire can be used for screening patients who may be at risk for severe adverse outcomes. 相似文献
69.
70.
目的 基于中医传承辅助平台软件(TCMISS,V2.5)对吕英教授治疗自闭症语言障碍的处方进行数据挖掘,探索其病因病机及组方规律。方法 收集吕英教授治疗自闭症语言障碍的医案,将其方药信息录入TCMISS,借助该平台集成的关联规则、改进互信息法、复杂系统熵聚类法、无监督熵层次聚类法等分析方法探索吕英教授治疗自闭症语言障碍的药物组方规律。结果 共筛选出120个医案,包含处方共120首,涉及中药89味,其中使用频次前6味中药为桂枝、鸡蛋花、白术、泽泻、石膏、桔梗,药性以寒、温为主,药味以甘、苦居多,归经多属肺、脾、肝经。通过关联规则分析所得的用药模式中,使用频次最高的为桂枝与鸡蛋花、桂枝与泽泻、白术与桂枝,进一步分析得到的核心药物为泽泻、桂枝、白术,为五苓散的药物组成,并基于复杂熵聚类方法演化出6首新处方。结论 吕英教授治疗自闭症语言障碍以阳明“气血津”不足和三焦气化功能失常为主要病机线路,清解阳明伏火、加强阳明本体液津血的生化化生及恢复三焦气化功能正常为主要治法,其核心代表方剂为木防己汤和五苓散。 相似文献