全文获取类型
收费全文 | 1338477篇 |
免费 | 112525篇 |
国内免费 | 6371篇 |
专业分类
耳鼻咽喉 | 16711篇 |
儿科学 | 43005篇 |
妇产科学 | 36559篇 |
基础医学 | 183626篇 |
口腔科学 | 36274篇 |
临床医学 | 120696篇 |
内科学 | 278503篇 |
皮肤病学 | 31886篇 |
神经病学 | 110516篇 |
特种医学 | 55534篇 |
外国民族医学 | 274篇 |
外科学 | 210354篇 |
综合类 | 31529篇 |
现状与发展 | 2篇 |
一般理论 | 415篇 |
预防医学 | 106625篇 |
眼科学 | 28089篇 |
药学 | 93703篇 |
5篇 | |
中国医学 | 2227篇 |
肿瘤学 | 70840篇 |
出版年
2018年 | 13374篇 |
2017年 | 10631篇 |
2016年 | 12795篇 |
2015年 | 14300篇 |
2014年 | 19947篇 |
2013年 | 29738篇 |
2012年 | 36233篇 |
2011年 | 38883篇 |
2010年 | 24372篇 |
2009年 | 23903篇 |
2008年 | 36360篇 |
2007年 | 38776篇 |
2006年 | 39905篇 |
2005年 | 38491篇 |
2004年 | 36725篇 |
2003年 | 35824篇 |
2002年 | 33835篇 |
2001年 | 66056篇 |
2000年 | 67920篇 |
1999年 | 56593篇 |
1998年 | 16726篇 |
1997年 | 15017篇 |
1996年 | 16015篇 |
1995年 | 16232篇 |
1994年 | 15098篇 |
1993年 | 14153篇 |
1992年 | 47098篇 |
1991年 | 45747篇 |
1990年 | 43970篇 |
1989年 | 41815篇 |
1988年 | 38758篇 |
1987年 | 38081篇 |
1986年 | 35859篇 |
1985年 | 34635篇 |
1984年 | 26358篇 |
1983年 | 22108篇 |
1982年 | 13847篇 |
1981年 | 12447篇 |
1980年 | 11718篇 |
1979年 | 23544篇 |
1978年 | 17072篇 |
1977年 | 14385篇 |
1976年 | 13182篇 |
1975年 | 13722篇 |
1974年 | 16093篇 |
1973年 | 15396篇 |
1972年 | 14173篇 |
1971年 | 13036篇 |
1970年 | 11880篇 |
1969年 | 11101篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
A Nonell S Kerk F Lederbogen D Kopf B Hamann S Lewicka M Deuschle 《Experimental and clinical endocrinology & diabetes》2004,112(1):59-61
Preclinical research suggests adrenal beta-adrenergic receptors to be involved in the regulation of steroid synthesis. In a group of healthy male volunteers, we compared ACTH-induced cortisol and dehydroepiandrosterone (DHEA) secretion after pre-treatment with orciprenaline, propranolol or placebo. Neither baseline nor ACTH-induced steroid secretion differed between these conditions. Our data do not support the hypothesis that the adrenal beta-receptor plays a major role in steroid secretion in humans. 相似文献
992.
993.
Evidence of sustained skeletal benefits from impact-loading exercise in young females: a 3-year longitudinal study. 总被引:4,自引:0,他引:4
Jaana A Nurmi-Lawton Adam D Baxter-Jones Robert L Mirwald Jacki A Bishop Patricia Taylor Cyrus Cooper Susan A New 《Journal of bone and mineral research》2004,19(2):314-322
The skeletal effects from intensive exercise throughout puberty are undefined. Forty-five female gymnasts and 52 controls were studied over 3 years, including a heredity aspect. The effects of size, maturity, exercise, and diet were identified using a multilevel regression model. Results demonstrated sustained skeletal benefits resulting from exercise throughout all stages of pubertal development. INTRODUCTION: Weight-bearing exercise is beneficial for peak bone mass development. However, whether skeletal benefits achieved with exercise are maintained if training remains intensive throughout the pubertal years is not entirely clear. The influence of familial resemblance for bone mass remains undefined in physically active versus inactive children. The aim of this study was to investigate the long-term influences of impact-loading exercise on bone quantity and quality in young females after controlling for growth, maturation, and hereditary factors. MATERIALS AND METHODS: At baseline, 45 gymnasts (G) and 52 normally active controls (C) 8-17 years of age were recruited. Anthropometry, diet, physical activity, and quantitative ultrasound (QUS) were measured annually for 3 consecutive years. DXA scans of total body (TB) and lumbar spine (LS) bone mineral content (BMC) and density (BMD) were taken three times at 1-year intervals. A multilevel regression model was fitted, and the independent effects of body size, maturity, physical activity, and diet were identified over time. To assess heredity influences, 27 G mothers and 26 C mothers volunteered for cross-sectional measurements of anthropometry, QUS, and BMC/BMD. RESULTS AND CONCLUSIONS: Gymnasts were smaller and lighter (as were their mothers) than controls, but they had significantly higher QUS and axial and appendicular BMC and BMD, with > 170 g more bone mineral in TB across puberty (after adjustment for maturity [years from peak height velocity], height, weight, energy, and protein intake). Gymnasts had up to 24-51% higher BMC and 13-28% higher BMD, depending on skeletal site. These results provide evidence of sustained skeletal benefits from impact-loading exercise, which are unlikely to result entirely from heredity, throughout pubertal years. 相似文献
994.
995.
996.
997.
998.
Drew T. Marshall John D. Gilbert Roger W. Byard 《Forensic science, medicine, and pathology》2007,3(1):53-55
A 26-year-old man who presented with a 2-year history of intermittent gynecomastia with recent onset of fever, night sweats,
and abdominal distension was found to have a left-sided adrenocortical carcinoma with metastases to the liver and spine. Sudden
death occurred 1 month after his presentation. At autopsy a saddle pulmonary thromboembolus was found occluding the pulmonary
outflow tract, with smaller more peripheral pulmonary thromboemboli. No tumor deposits were identified in the thromboemboli.
The thromboemboli had arisen from a tongue of tumor that had grown through the left adrenal vein into the inferior vena cava.
Despite a high rate of angio-invasion there are very few reports of sudden death resulting from this phenomenon in patients
with adrenocortical carcinoma. 相似文献
999.
1000.