全文获取类型
收费全文 | 1651篇 |
免费 | 172篇 |
国内免费 | 21篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 110篇 |
妇产科学 | 10篇 |
基础医学 | 235篇 |
口腔科学 | 69篇 |
临床医学 | 169篇 |
内科学 | 385篇 |
皮肤病学 | 52篇 |
神经病学 | 58篇 |
特种医学 | 244篇 |
外科学 | 179篇 |
综合类 | 46篇 |
预防医学 | 90篇 |
眼科学 | 19篇 |
药学 | 90篇 |
1篇 | |
中国医学 | 2篇 |
肿瘤学 | 81篇 |
出版年
2023年 | 8篇 |
2022年 | 11篇 |
2021年 | 15篇 |
2020年 | 17篇 |
2019年 | 24篇 |
2018年 | 28篇 |
2017年 | 18篇 |
2016年 | 25篇 |
2015年 | 42篇 |
2014年 | 42篇 |
2013年 | 66篇 |
2012年 | 58篇 |
2011年 | 60篇 |
2010年 | 75篇 |
2009年 | 78篇 |
2008年 | 60篇 |
2007年 | 72篇 |
2006年 | 47篇 |
2005年 | 55篇 |
2004年 | 40篇 |
2003年 | 52篇 |
2002年 | 34篇 |
2001年 | 37篇 |
2000年 | 24篇 |
1999年 | 38篇 |
1998年 | 83篇 |
1997年 | 84篇 |
1996年 | 64篇 |
1995年 | 54篇 |
1994年 | 44篇 |
1993年 | 50篇 |
1992年 | 20篇 |
1991年 | 33篇 |
1990年 | 23篇 |
1989年 | 49篇 |
1988年 | 47篇 |
1987年 | 37篇 |
1986年 | 23篇 |
1985年 | 27篇 |
1984年 | 17篇 |
1983年 | 17篇 |
1982年 | 17篇 |
1981年 | 17篇 |
1980年 | 19篇 |
1979年 | 12篇 |
1978年 | 14篇 |
1977年 | 12篇 |
1976年 | 13篇 |
1975年 | 9篇 |
1966年 | 3篇 |
排序方式: 共有1844条查询结果,搜索用时 15 毫秒
1.
2.
Pyomyositis: characteristics at CT and MR imaging 总被引:9,自引:0,他引:9
3.
S. L. Grant P. A. Phillips C. B. Gow 《Clinical and experimental pharmacology & physiology》1994,21(3):243-247
1. Epidermal growth factor is a potent mitogen that causes natriuresis, diuresis and inhibition of arginine vasopressin-induced water reabsorption. 2. The aim of this study was to determine any interaction between epidermal growth factor and the V1 (vascular) and/or V2 (antidiuretic) arginine vasopressin receptor subtypes. 3. Radioligand binding displacement assays demonstrated that although arginine vasopressin related peptides displaced both radioligands from renal medullary membranes at low concentrations epidermal growth factor displaced neither. 4. Arginine vasopressin V2 receptor second messenger cyclic adenosine monophosphate (CAMP) production was inhibited by epidermal growth factor (IC50 2 ± 10?7 mol/L) as was sodium fluoride cAMP production but only at much higher concentrations. 5. Therefore the diuretic effect of epidermal growth factor is not via direct antagonism of arginine vasopressin receptors but seems mediated via inhibition of the V2 second messenger system. 相似文献
4.
5.
D De AJ Kanwar S Handa 《Journal of the European Academy of Dermatology and Venereology》2006,20(7):853-859
BACKGROUND: Diagnosis of atopic dermatitis (AD) depends on clinical features because no definitive diagnostic test exists. Criteria proposed by Hanifin and Rajka (Acta Derm Venereol (Stockh) 1980; Suppl 92: 44-47) were acceptable for hospital-based studies but were found not to be suitable for field studies. A UK working party formulated clinical diagnostic criteria that could be used in both hospital and epidemiological settings. Validation studies of the criteria showed widely variable results, probably due to different clinical settings and ethnicity. AIM AND OBJECTIVE: This study was undertaken to validate Hanifin and Rajka's criteria and to assess the comparative efficacy of their criteria and the UK working party's diagnostic criteria in the diagnosis of AD in a hospital setting in North India. SUBJECTS AND METHODS: This study serially included 101 patients with AD and 48 controls of paediatric age group. The study period was from July 2003 to December 2004. RESULTS: Hanifin and Rajka's criteria (sensitivity 96%, specificity 93.75%, positive predictive value 97% (PPV) and negative predictive value (NPV) 91.84%) had a statistical advantage over the UK working party's diagnostic criteria (sensitivity 86%, specificity 95.83%, PPV 97.75% and NPV 76.67%), with a P-value < 0.005. 相似文献
6.
SUMMARY Impotence is a common symptom which can cause considerable distress to both the sufferer and his partner. The use of pharmacotherapy to improve erectile function will continue to increase as safe and effective drugs are developed. However, restoring erectile function should not be the only treatment objective. It is also essential to address personal and emotional factors in the sufferer, conflicts in his relationship with his partner, and sexual problems in his partner, all of which may be instrumental in causing or maintaining the presenting impotence. We advocate a combined approach with appropriate medical treatment and sex and couple therapy 相似文献
7.
8.
9.
10.
L F Gow 《Magnesium research》2002,15(3-4):199-202
Ionised levels of serum magnesium (Mg2+) and calcium (Ca2+) were measured in HEPES-buffered serum from lactating goats before and during weaning. During this period, there was a significant rise in serum Ca2+, and a concomitant fall in Mg2+. These opposing changes can be explained by the known enhanced absorption of Ca relative to Mg by the gut during lactation coupled with a Ca-induced suppression of PTH-driven renal Ca and Mg reabsorption. A rise in the serum Ca2+/Mg2+ ratio during weaning suggests that this is a period of potential cardiovascular risk for the mother, and merits closer study. 相似文献