全文获取类型
收费全文 | 124393篇 |
免费 | 47988篇 |
国内免费 | 1666篇 |
专业分类
耳鼻咽喉 | 1970篇 |
儿科学 | 5260篇 |
妇产科学 | 1625篇 |
基础医学 | 20908篇 |
口腔科学 | 6076篇 |
临床医学 | 18048篇 |
内科学 | 32618篇 |
皮肤病学 | 8344篇 |
神经病学 | 15946篇 |
特种医学 | 3284篇 |
外国民族医学 | 6篇 |
外科学 | 19349篇 |
综合类 | 6153篇 |
现状与发展 | 2篇 |
一般理论 | 30篇 |
预防医学 | 8582篇 |
眼科学 | 2447篇 |
药学 | 10221篇 |
52篇 | |
中国医学 | 3271篇 |
肿瘤学 | 9855篇 |
出版年
2024年 | 132篇 |
2023年 | 672篇 |
2022年 | 1403篇 |
2021年 | 3835篇 |
2020年 | 6734篇 |
2019年 | 12288篇 |
2018年 | 11788篇 |
2017年 | 12950篇 |
2016年 | 13316篇 |
2015年 | 13815篇 |
2014年 | 14425篇 |
2013年 | 15350篇 |
2012年 | 8818篇 |
2011年 | 8809篇 |
2010年 | 12057篇 |
2009年 | 8022篇 |
2008年 | 5435篇 |
2007年 | 4219篇 |
2006年 | 3810篇 |
2005年 | 3319篇 |
2004年 | 2716篇 |
2003年 | 2609篇 |
2002年 | 2340篇 |
2001年 | 1193篇 |
2000年 | 1030篇 |
1999年 | 555篇 |
1998年 | 298篇 |
1997年 | 267篇 |
1996年 | 239篇 |
1995年 | 190篇 |
1994年 | 159篇 |
1993年 | 123篇 |
1992年 | 120篇 |
1991年 | 78篇 |
1990年 | 84篇 |
1989年 | 74篇 |
1988年 | 63篇 |
1987年 | 52篇 |
1986年 | 54篇 |
1985年 | 50篇 |
1984年 | 46篇 |
1983年 | 44篇 |
1982年 | 59篇 |
1981年 | 67篇 |
1980年 | 36篇 |
1979年 | 42篇 |
1978年 | 22篇 |
1977年 | 32篇 |
1976年 | 32篇 |
1975年 | 19篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
121.
Micro‐evolution of the hepatitis B virus genome in hepatitis B e‐antigen‐positive carriers: Comparison of genotypes B and C at various immune stages
下载免费PDF全文
![点击此处可从《Journal of gastroenterology and hepatology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
122.
Talita da Silva Mendes de Farias Ariclécio Cunha de Oliveira Sandra Andreotti Fernanda Gaspar do Amaral Patrícia Chimin André Ricardo Alves de Proença Francisco Leonardo Torres Leal Rogério Antonio Laurato Sertié Amanda Baron Campana Andressa Bolsoni Lopes Arnaldo Henrique de Souza José Cipolla‐Neto Fabio Bessa Lima 《Journal of pineal research》2015,58(3):251-261
Melatonin, the main hormone produced by the pineal gland, is secreted in a circadian manner (24‐hr period), and its oscillation influences several circadian biological rhythms, such as the regulation of clock genes expression (chronobiotic effect) and the modulation of several endocrine functions in peripheral tissues. Assuming that the circadian synchronization of clock genes can play a role in the regulation of energy metabolism and it is influenced by melatonin, our study was designed to assess possible alterations as a consequence of melatonin absence on the circadian expression of clock genes in the epididymal adipose tissue of male Wistar rats and the possible metabolic repercussions to this tissue. Our data show that pinealectomy indeed has impacts on molecular events: it abolishes the daily pattern of the expression of Clock, Per2, and Cry1 clock genes and Pparγ expression, significantly increases the amplitude of daily expression of Rev‐erbα, and affects the pattern of and impairs adipokine production, leading to a decrease in leptin levels. However, regarding some metabolic aspects of adipocyte functions, such as its ability to synthesize triacylglycerols from glucose along 24 hr, was not compromised by pinealectomy, although the daily profile of the lipogenic enzymes expression (ATP‐citrate lyase, malic enzyme, fatty acid synthase, and glucose‐6‐phosphate dehydrogenase) was abolished in pinealectomized animals. 相似文献
123.
目的:探讨美托洛尔(β1受体阻滞剂)用于老年COPD合并冠心病史治疗的临床疗效。方法:选取2018年6月—2019年6月在我院接受治疗的60岁以上(包括60岁)COPD合并冠心病史老年患者,分为对照组与观察组。对照组给予接受布地奈德福莫特罗粉吸入剂治疗,观察组在使用布地奈德福莫特罗粉吸入剂治疗的基础上口服琥珀酸美托洛尔缓释片治疗,观察对比两组治疗效果。结果:观察组临床治疗效果优于对照组,观察组住院时长以及并发症的发生率低于对照组(P<0.05),差异具有统计学意义。结论:老年COPD合并冠心病史接受美托洛尔治疗,可有效缩短住院时长、用药效果明显、有效提升用药安全性,值得临床推广。 相似文献
124.
More than just crushing: a prospective pre‐post intervention study to reduce drug preparation errors in patients with feeding tubes
下载免费PDF全文
![点击此处可从《Journal of clinical pharmacy and therapeutics》网站下载免费的PDF全文](/ch/ext_images/free.gif)
125.
126.
Clinical Spectrum of Capillary Malformation–Arteriovenous Malformation Syndrome Presenting to a Pediatric Dermatology Practice: A Retrospective Study
下载免费PDF全文
![点击此处可从《Pediatric dermatology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Nicole A. Weitz M.D. Christine T. Lauren M.D. Gerald G. Behr M.D. June K. Wu M.D. Jessica J. Kandel M.D. Philip M. Meyers M.D. Sally Sultan M.D. Kwame Anyane‐Yeboa M.D. Kimberly D. Morel M.D. Maria C. Garzon M.D. 《Pediatric dermatology》2015,32(1):76-84
Capillary malformation–arteriovenous malformation syndrome (CM‐AVM) is an autosomal dominant disorder caused by RASA1 mutations. The prevalence and phenotypic spectrum are unknown. Evaluation of patients with multiple CMs is challenging because associated AVMs can be life threatening. The objective of this study was to describe the clinical characteristics of children presenting with features of CM‐AVM to an academic pediatric dermatology practice. After institutional review board approval was received, a retrospective chart review was performed of patients presenting between 2009 and 2012 with features of CM‐AVM. We report nine cases. Presenting symptoms ranged from extensive vascular stains and cardiac failure to CMs noted incidentally during routine skin examination. All demonstrated multiple CMs, two had Parkes Weber syndrome, and two had multiple infantile hemangiomas. Seven patients had family histories of multiple CMs; three had family histories of large, atypical CMs. Six had personal or family histories of AVMs. Genetic evaluation was recommended for all and was pursued by six families; four RASA1 mutations were identified, including one de novo. Consultations with neurology, cardiology, and orthopedics were recommended. Most patients (89%) have not required treatment to date. CM‐AVM is an underrecognized condition with a wide clinical spectrum that often presents in childhood. Further evaluation may be indicated in patients with multiple CMs. This study is limited by its small and retrospective nature. 相似文献
127.
128.
Inflammation but not obesity or insulin resistance is associated with increased plasma fibroblast growth factor 23 concentration in the elderly
下载免费PDF全文
![点击此处可从《Clinical endocrinology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
129.
130.