全文获取类型
收费全文 | 23614篇 |
免费 | 1543篇 |
国内免费 | 98篇 |
专业分类
耳鼻咽喉 | 300篇 |
儿科学 | 813篇 |
妇产科学 | 691篇 |
基础医学 | 2759篇 |
口腔科学 | 360篇 |
临床医学 | 3756篇 |
内科学 | 4040篇 |
皮肤病学 | 276篇 |
神经病学 | 2143篇 |
特种医学 | 425篇 |
外国民族医学 | 3篇 |
外科学 | 2169篇 |
综合类 | 343篇 |
一般理论 | 88篇 |
预防医学 | 3287篇 |
眼科学 | 879篇 |
药学 | 1375篇 |
中国医学 | 27篇 |
肿瘤学 | 1521篇 |
出版年
2023年 | 122篇 |
2022年 | 237篇 |
2021年 | 481篇 |
2020年 | 293篇 |
2019年 | 459篇 |
2018年 | 575篇 |
2017年 | 393篇 |
2016年 | 475篇 |
2015年 | 561篇 |
2014年 | 712篇 |
2013年 | 1182篇 |
2012年 | 1611篇 |
2011年 | 1692篇 |
2010年 | 936篇 |
2009年 | 818篇 |
2008年 | 1473篇 |
2007年 | 1672篇 |
2006年 | 1643篇 |
2005年 | 1604篇 |
2004年 | 1560篇 |
2003年 | 1443篇 |
2002年 | 1389篇 |
2001年 | 229篇 |
2000年 | 180篇 |
1999年 | 243篇 |
1998年 | 297篇 |
1997年 | 244篇 |
1996年 | 204篇 |
1995年 | 188篇 |
1994年 | 190篇 |
1993年 | 154篇 |
1992年 | 134篇 |
1991年 | 137篇 |
1990年 | 115篇 |
1989年 | 108篇 |
1988年 | 99篇 |
1987年 | 87篇 |
1986年 | 83篇 |
1985年 | 86篇 |
1984年 | 107篇 |
1983年 | 106篇 |
1982年 | 126篇 |
1981年 | 131篇 |
1980年 | 117篇 |
1979年 | 74篇 |
1978年 | 68篇 |
1977年 | 68篇 |
1976年 | 54篇 |
1975年 | 53篇 |
1974年 | 47篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Hannah C. Nordhues Anjali Bhagra Natya N. Stroud Jennifer A. Vencill Carol L. Kuhle 《Mayo Clinic proceedings. Mayo Clinic》2021,96(7):1907-1920
The coronavirus disease 2019 (COVID-19) pandemic has rapidly created widespread impacts on global health and the economy. Data suggest that women are less susceptible to severe illness. However, sex-disaggregated data are incomplete, leaving room for misinterpretation, and focusing only on biologic sex underestimates the gendered impact of the pandemic on women. This narrative review summarizes what is known about gender disparities during the COVID-19 pandemic and the economic, domestic, and health burdens along with overlapping vulnerabilities related to the pandemic. In addition, this review outlines recommended strategies that advocacy groups, community leaders, and policymakers should implement to mitigate the widening gender disparities related to COVID-19. 相似文献
2.
3.
Osric A. Forrest Daniel M. Chopyk Yael Gernez Milton R. Brown Carol K. Conrad Richard B. Moss Vin Tangpricha Limin Peng Rabindra Tirouvanziam 《Journal of cystic fibrosis》2019,18(1):64-70
Background
Resistin is an immunometabolic mediator that is elevated in several inflammatory disorders. A ligand for Toll-like receptor 4, resistin modulates the recruitment and activation of myeloid cells, notably neutrophils. Neutrophils are major drivers of cystic fibrosis (CF) lung disease, in part due to the release of human neutrophil elastase- and myeloperoxidase-rich primary granules, leading to tissue damage. Here we assessed the relationship of resistin to CF lung disease.Methods
Resistin levels were measured in plasma and sputum from three retrospective CF cohorts spanning a wide range of disease. We also assessed the ability of neutrophils to secrete resistin upon activation in vitro. Finally, we constructed a multivariate model assessing the relationship between resistin levels and lung function.Results
Plasma resistin levels were only marginally higher in CF than in healthy control subjects. By contrast, sputum resistin levels were very high in CF, reaching 50–100 fold higher levels than in plasma. Among CF patients, higher plasma resistin levels were associated with allergic bronchopulmonary aspergillosis, and higher sputum resistin levels were associated with CF-related diabetes. Mechanistically, in vitro release of neutrophil primary granules was concomitant with resistin secretion. Overall, sputum resistin levels were negatively correlated with CF lung function, independently of other variables (age, sex, and genotype).Conclusions
Our data establish relationships between resistin levels in the plasma and sputum of CF patients that correlate with disease status, and identify resistin as a novel mechanistic link between neutrophilic inflammation and lung disease in CF. 相似文献4.
Sania Amr Magdy Garas Dina N. K. Boulos Doa’a A. Saleh Irene A. Jillson Christopher A. Loffredo 《Journal of substance use》2019,24(3):341-345
Background: Egyptian street youth use substances including tobacco, illicit drugs, and pharmaceutical drugs. To understand the circumstances, including adverse childhood experiences, that place adolescents at risk for engaging in substance use, we conducted in-depth interviews among a sample of Egyptian street children. Methods: From youth residing at or attending Caritas, a non-profit organization, which provides shelter and education to street youth, seven girls and twelve boys, aged 12–18 years, participated in open-ended, in-depth interviews. Results: Eight out of the 19 participants reported family history (early exposure) to substance use; and seven of them were initiated by either a family member (sibling), friend or coworker. Most of the participants reported a history of conflict with or abuse (verbal or physical) by their parents or siblings, or stressful situations at home; they used substance(s) to alleviate their stress. Few attended school, and some were forced to work and help their family. Conclusions: Among Egyptian youth, adverse childhood experiences, such as poverty, child abuse, and family substance use, challenge somewhat susceptible youths and lead them to the path of substance use and addiction. Prevention intervention should be multifaceted, culturally adaptable, and primarily targeting the social environment during childhood. 相似文献
5.
6.
7.
Walid K. Abu Saleh Phillip Mason Odeaa Al Jabbari Hany Samir Brian A. Bruckner 《Texas Heart Institute journal / from the Texas Heart Institute of St. Luke's Episcopal Hospital, Texas Children's Hospital》2015,42(6):569-571
The Impella 5.0, a percutaneously inserted left ventricular assist device, has been used to support patients who have severe heart failure or who are undergoing high-risk percutaneous coronary intervention. We report our surgical placement of the Impella 5.0, through a graft sewn to the aorta, to unload the left ventricle of a 59-year-old man who was undergoing venoarterial extracorporeal membrane oxygenation for postcardiotomy shock. The patient underwent successful placement of a long-term left ventricular assist device before his discharge from the hospital. The versatility of the Impella 5.0 is exemplified in this patient who was successfully bridged to long-term support. 相似文献
8.
Femoral access‐related complications during percutaneous transcatheter aortic valve implantation comparing single versus double Prostar XL device closure
下载免费PDF全文
![点击此处可从《Catheterization and cardiovascular interventions》网站下载免费的PDF全文](/ch/ext_images/free.gif)
9.
10.
Fluid role boundaries: exploring the contribution of the advanced nurse practitioner to multi‐professional palliative care
下载免费PDF全文
![点击此处可从《Journal of clinical nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)