全文获取类型
收费全文 | 31536篇 |
免费 | 2388篇 |
国内免费 | 116篇 |
专业分类
耳鼻咽喉 | 365篇 |
儿科学 | 809篇 |
妇产科学 | 415篇 |
基础医学 | 4100篇 |
口腔科学 | 636篇 |
临床医学 | 2876篇 |
内科学 | 6576篇 |
皮肤病学 | 463篇 |
神经病学 | 3569篇 |
特种医学 | 1380篇 |
外国民族医学 | 3篇 |
外科学 | 4673篇 |
综合类 | 677篇 |
一般理论 | 66篇 |
预防医学 | 2737篇 |
眼科学 | 607篇 |
药学 | 1959篇 |
中国医学 | 20篇 |
肿瘤学 | 2109篇 |
出版年
2023年 | 104篇 |
2021年 | 378篇 |
2020年 | 258篇 |
2019年 | 445篇 |
2018年 | 576篇 |
2017年 | 420篇 |
2016年 | 483篇 |
2015年 | 557篇 |
2014年 | 850篇 |
2013年 | 1338篇 |
2012年 | 2039篇 |
2011年 | 2175篇 |
2010年 | 1173篇 |
2009年 | 1112篇 |
2008年 | 2065篇 |
2007年 | 2211篇 |
2006年 | 2168篇 |
2005年 | 2363篇 |
2004年 | 2087篇 |
2003年 | 1918篇 |
2002年 | 1936篇 |
2001年 | 342篇 |
2000年 | 270篇 |
1999年 | 324篇 |
1998年 | 376篇 |
1997年 | 370篇 |
1996年 | 324篇 |
1995年 | 364篇 |
1994年 | 291篇 |
1993年 | 278篇 |
1992年 | 236篇 |
1991年 | 262篇 |
1990年 | 244篇 |
1989年 | 226篇 |
1988年 | 198篇 |
1987年 | 216篇 |
1986年 | 191篇 |
1985年 | 192篇 |
1984年 | 236篇 |
1983年 | 228篇 |
1982年 | 280篇 |
1981年 | 270篇 |
1980年 | 226篇 |
1979年 | 133篇 |
1978年 | 148篇 |
1977年 | 104篇 |
1976年 | 124篇 |
1975年 | 83篇 |
1974年 | 108篇 |
1973年 | 79篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Francisco J. Rubio Richard Quintana‐Feliciano Brandon L. Warren Xuan Li Kailyn F. R. Witonsky Frank Soto del Valle Pooja V. Selvam Daniele Caprioli Marco Venniro Jennifer M. Bossert Yavin Shaham Bruce T. Hope 《The European journal of neuroscience》2019,49(2):165-178
Many preclinical studies examined cue‐induced relapse to heroin and cocaine seeking in animal models, but most of these studies examined only one drug at a time. In human addicts, however, polydrug use of cocaine and heroin is common. We used a polydrug self‐administration relapse model in rats to determine similarities and differences in brain areas activated during cue‐induced reinstatement of heroin and cocaine seeking. We trained rats to lever press for cocaine (1.0 mg/kg per infusion, 3‐hr/day, 18 day) or heroin (0.03 mg/kg per infusion) on alternating days (9 day for each drug); drug infusions were paired with either intermittent or continuous light cue. Next, the rats underwent extinction training followed by tests for cue‐induced reinstatement where they were exposed to either heroin‐ or cocaine‐associated cues. We observed cue‐selective reinstatement of drug seeking: the heroin cue selectively reinstated heroin seeking and the cocaine cue selectively reinstated cocaine seeking. We used Fos immunohistochemistry to assess cue‐induced neuronal activation in different subregions of the medial prefrontal cortex, dorsal striatum, nucleus accumbens, and amygdala. Fos expression results indicated that only the prelimbic cortex (PL) was activated by both heroin and cocaine cues; in contrast, no significant cue‐induced neuronal activation was observed in other brain areas. RNA in situ hybridization indicated that the proportion of glutamatergic and GABAergic markers in PL Fos‐expressing cells was similar for the heroin and cocaine cue‐activated neurons. Overall, the results indicate that PL may be a common brain area involved in both heroin and cocaine seeking during polydrug use. 相似文献
4.
Neil Ryan Johanna Wall Emma J Crosbie Mark Arends Tjalling Bosse Saimah Arif Asma Faruqi Ian Frayling Raji Ganesan Ye L Hock Raymond McMahon Ranjit Manchanda W Glenn McCluggage Pinias Mukonoweshuro Gerhard van Schalkwyk Lucy Side John H Smith Bruce Tanchel D Gareth Evans C Blake Gilks Naveena Singh 《Histopathology》2019,75(6):813-824
5.
Sabrina Paganoni MD PhD Mohamad J. Alshikho MD Sarah Luppino RN James Chan MA Lindsay Pothier BA David Schoenfeld PhD Patricia L. Andres DPT Suma Babu MD Nicole R. Zürcher PhD Marco L. Loggia PhD Robert L. Barry PhD Silvia Luotti MS Giovanni Nardo PhD Maria Chiara Trolese MS Serena Pantalone MS Caterina Bendotti PhD Valentina Bonetto PhD Fabiola De Marchi MD Bruce Rosen MD PhD Jacob Hooker PhD Merit Cudkowicz MD Nazem Atassi MD 《Muscle & nerve》2019,59(3):303-308
Introduction: RNS60 is a novel immune-modulatory agent that has shown neuroprotective effects in amytrophic lateral sclerosis (ALS) preclinical models. RNS60 is administered by weekly intravenous infusion and daily nebulization. The objective of this pilot open-label trial was to test the feasibility, safety, and tolerability of long-term RNS60 administration in ALS patients. Methods: The planned treatment duration was 23 weeks and the primary outcomes were safety and tolerability. Secondary outcomes included PBR28 positron emission tomography (PET) imaging and plasma biomarkers of inflammation. Results: Sixteen participants with ALS received RNS60 and 13 (81%) completed 23 weeks of RNS60 treatment. There were no serious adverse events and no participants withdrew from the trial due to drug-related adverse events. There were no significant changes in the biomarkers. Discussion: Long-term RNS60 administration was safe and well-tolerated. A large, multicenter, phase II trial of RNS60 is currently enrolling participants to test the effects of RNS60 on ALS biomarkers and disease progression. Muscle Nerve 59 :303–308, 2019 相似文献
6.
7.
Benjamin Davido Rui Batista Aurélien Dinh Pierre de Truchis E.M. Terveer Bruce Roberts Ed J. Kuijper Silvia Caballero 《International journal of antimicrobial agents》2019,53(5):553-556
Background
Spontaneous decolonization of antibiotic-resistant bacteria (ARB) takes time: approximately 25% after 30 days for carbapenem-producing Enterobacteriaceae or extended-spectrum beta-lactamase-producing Enterobacteriaceae. Faecal microbiota transplantation (FMT) has been proposed as a new strategy to promote decolonization in order to reduce the risk of superinfection due to these ARB. This paper discusses the literature on the use of FMT for this indication, and the improvement levers available to promote its efficacy.Methods
Literature available to date concerning the use of FMT to eradicate ARB was reviewed, and the different factors that may have influenced the efficacy of decolonization were evaluated.Results
Four axes that could have played major roles in the efficacy of FMT were identified: bowel preparation before FMT; donor; dose; and thermal conditioning of faeces. The positive or negative impact of each on the outcome of FMT is discussed.Conclusion
Although FMT is very efficient for the eradication of Clostridium difficile, the same ‘recipe’ cannot be used for the eradication of ARB. Working together with expert centres may help to improve the efficacy of FMT for this indication, and enable the reduction of in-hospital isolation precautions. 相似文献8.
Perry David C. Datta Samir Miller Zachary A. Rankin Katherine P. Gorno-Tempini Maria Luisa Kramer Joel H. Rosen Howard J. Seeley William W. Miller Bruce L. 《Journal of neurology》2019,266(8):1998-2009
Journal of Neurology - To determine the frequency and characteristics of clinical diagnostic change in frontotemporal dementia (FTD)-spectrum syndromes and Alzheimer’s disease (AD)-type... 相似文献
9.
Weight loss and co-morbidity resolution between different races and ethnicities after gastric bypass
Michael Turner Yalini Vigneswaran Elizabeth Dewey Bruce M. Wolfe Andrea M. Stroud Donn Spight David R. Flum Anita Courcoulas James E. Mitchell Walter J. Pories Alfons Pomp Farah A. Husain 《Surgery for obesity and related diseases》2019,15(11):1943-1948
BackgroundSeveral studies have demonstrated that minorities and Hispanic ethnicities have disproportionally greater burden of morbid obesity in the United States. However, the majority of bariatric procedures are performed in the non-Hispanic white population.ObjectivesThe objective of this study was to investigate the weight loss and remission of obesity-related co-morbidities based on race and ethnicity.SettingThe Longitudinal Assessment of Bariatric Surgery prospective, multicenter, observational study was used to collect patients from 10 different health centers across the United States.MethodsRetrospective analysis of a prospective, multicenter, observational study over a 5-year follow-up.ResultsAll patients who underwent primary gastric bypass and provided racial/ethnic information were included in the study (n = 1695). Regardless of race or ethnicity, total weight loss was maintained over a 5-year follow-up, which included 87% of the original cohort. However, whites had on average 1.94% higher adjusted total weight loss compared with blacks (P < .0001). After adjusting for confounders there were no significant differences in resolution of co-morbidities, including diabetes.ConclusionAll patients regardless of race or ethnicity have significant and sustained total weight loss and resolution of co-morbidities after gastric bypass at 5-year follow-up. 相似文献
10.
Wenyue Sun Bishwanath Chatterjee Jack F. Shern Rajesh Patidar Young Song Yonghong Wang Robert L. Walker Bruce R. Pawel Corinne M. Linardic Peter Houghton Stephen M. Hewitt Daniel C. Edelman Javed Khan Paul S. Meltzer Frederic G. Barr 《International journal of cancer. Journal international du cancer》2019,144(11):2707-2717