全文获取类型
收费全文 | 6674篇 |
免费 | 560篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 45篇 |
儿科学 | 223篇 |
妇产科学 | 151篇 |
基础医学 | 800篇 |
口腔科学 | 214篇 |
临床医学 | 588篇 |
内科学 | 1191篇 |
皮肤病学 | 88篇 |
神经病学 | 380篇 |
特种医学 | 218篇 |
外国民族医学 | 14篇 |
外科学 | 883篇 |
综合类 | 382篇 |
一般理论 | 7篇 |
预防医学 | 1380篇 |
眼科学 | 50篇 |
药学 | 279篇 |
1篇 | |
中国医学 | 2篇 |
肿瘤学 | 345篇 |
出版年
2021年 | 91篇 |
2020年 | 72篇 |
2019年 | 71篇 |
2018年 | 104篇 |
2017年 | 81篇 |
2016年 | 56篇 |
2015年 | 105篇 |
2014年 | 146篇 |
2013年 | 195篇 |
2012年 | 255篇 |
2011年 | 233篇 |
2010年 | 182篇 |
2009年 | 137篇 |
2008年 | 260篇 |
2007年 | 240篇 |
2006年 | 256篇 |
2005年 | 245篇 |
2004年 | 225篇 |
2003年 | 192篇 |
2002年 | 193篇 |
2001年 | 186篇 |
2000年 | 200篇 |
1999年 | 143篇 |
1998年 | 93篇 |
1997年 | 69篇 |
1996年 | 127篇 |
1995年 | 171篇 |
1994年 | 160篇 |
1993年 | 140篇 |
1992年 | 239篇 |
1991年 | 214篇 |
1990年 | 178篇 |
1989年 | 134篇 |
1988年 | 146篇 |
1987年 | 135篇 |
1986年 | 136篇 |
1985年 | 135篇 |
1984年 | 114篇 |
1983年 | 94篇 |
1982年 | 68篇 |
1981年 | 59篇 |
1979年 | 78篇 |
1978年 | 70篇 |
1976年 | 53篇 |
1974年 | 70篇 |
1973年 | 60篇 |
1972年 | 50篇 |
1971年 | 51篇 |
1969年 | 49篇 |
1968年 | 47篇 |
排序方式: 共有7241条查询结果,搜索用时 15 毫秒
1.
MUAMMER SEYHAN BAAK KANDI COKUN HÜLYA SALAM HAMDI ÖZCAN YELDA KARINCAOLU 《Pediatrics international》2006,48(6):525-530
BACKGROUND: The present study was aimed to define the gender ratio, familial occurrence, age of onset, precipitating factors, clinical types, nail and joint involvement of psoriasis in childhood and adolescence in Turkey. METHODS: A total of 61 children with psoriasis under 18 years old were evaluated retrospectively, for age, gender, age of disease onset, family history, concomitant disease, the clinical type of psoriasis, clinical localization, nail and joint involvement and treatment modalities. RESULTS: Of the patients, 23 (37.70%) were boys and 38 (62.30%) were girls. Mean age was 9.28 +/- 4.02 years in girls and 11.18 +/- 3.85 years in boys (9.96 +/- 4.03 years in all children). Mean age at the onset of the disease was 6.81 +/- 4.11 years in girls and 7.03 +/- 4.28 years in boys (6.89 +/- 4.14 years in all patients). In 14 (23%) cases, a positive family history was detected. The most frequent probable triggering factors were upper respiratory tract infections (14.8%) and positive throat culture for A group ss-hemolytic streptococcus (21.3%). Frequency of emotional stress and psychiatric morbidity were 54% and 9.8%, respectively. The most frequent localizations at onset were trunk (44.3%), extremities (54.0%), and scalp (36.0%). Three children (4.9%) had a history of dissemination from psoriatic diaper rash. In total, 51 (83.6%) patients presented with psoriasis vulgaris, eight (13.1%) with generalized pustular psoriasis, and the remaining two (3.3%) with erythrodermic psoriasis. CONCLUSION: The incidence of psoriasis among dermatological patients in childhood and adolescence was 3.8%. The disease tends to appear earlier in girls than boys. The authors suggested that stress and upper respiratory infections are the most important triggering factors in childhood and adolescence psoriasis. 相似文献
2.
V Aerra M Kuduvalli AN Moloto AK Srinivasan AD Grayson BM Fabri AY Oo 《Journal of cardiothoracic surgery》2006,1(1):6-5
Background
Atrial fibrillation can occur in up to 40% of patients undergoing coronary surgery. 相似文献3.
4.
5.
Diabetic polyneuropathy 总被引:1,自引:0,他引:1
6.
7.
8.
Over the last several decades the idea that adenosine (Ado) plays a role in sleep control was postulated due in large part to pharmacological studies that showed the ability of Ado agonists to induce sleep and Ado antagonists to decrease sleep. A second wave of research involving in vitro cellular analytic approaches and subsequently, the use of neurochemical tools such as microdialysis, identified a population of cells within the brainstem and basal forebrain arousal centers, with activity that is both tightly coupled to thalamocortical activation and under tonic inhibitory control by Ado. Most recently, genetic tools have been used to show that Ado receptors regulate a key aspect of sleep, the slow wave activity expressed during slow wave sleep. This review will briefly introduce some of the phenomenology of sleep and then summarize the effect of Ado levels on sleep, the effect of sleep on Ado levels, and recent experiments using mutant mouse models to characterize the role for Ado in sleep control and end with a discussion of which Ado receptors are involved in such control. When taken together, these various experiments suggest that while Ado does play a role in sleep control, it is a specific role with specific functional implications and it is one of many neurotransmitters and neuromodulators affecting the complex behavior of sleep. Finally, since the majority of adenosine-related experiments in the sleep field have focused on SWS, this review will focus largely on SWS; however, the role of adenosine in REM sleep behavior will be addressed. 相似文献
9.
10.