全文获取类型
收费全文 | 6305篇 |
免费 | 462篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 184篇 |
儿科学 | 214篇 |
妇产科学 | 158篇 |
基础医学 | 849篇 |
口腔科学 | 107篇 |
临床医学 | 584篇 |
内科学 | 1183篇 |
皮肤病学 | 220篇 |
神经病学 | 546篇 |
特种医学 | 307篇 |
外科学 | 858篇 |
综合类 | 44篇 |
预防医学 | 631篇 |
眼科学 | 62篇 |
药学 | 419篇 |
中国医学 | 2篇 |
肿瘤学 | 408篇 |
出版年
2023年 | 97篇 |
2022年 | 116篇 |
2021年 | 224篇 |
2020年 | 178篇 |
2019年 | 224篇 |
2018年 | 228篇 |
2017年 | 174篇 |
2016年 | 162篇 |
2015年 | 193篇 |
2014年 | 255篇 |
2013年 | 321篇 |
2012年 | 395篇 |
2011年 | 441篇 |
2010年 | 209篇 |
2009年 | 176篇 |
2008年 | 286篇 |
2007年 | 311篇 |
2006年 | 287篇 |
2005年 | 283篇 |
2004年 | 240篇 |
2003年 | 213篇 |
2002年 | 178篇 |
2001年 | 85篇 |
2000年 | 103篇 |
1999年 | 97篇 |
1998年 | 46篇 |
1997年 | 40篇 |
1996年 | 44篇 |
1995年 | 46篇 |
1994年 | 37篇 |
1993年 | 30篇 |
1992年 | 58篇 |
1991年 | 72篇 |
1990年 | 68篇 |
1989年 | 54篇 |
1988年 | 58篇 |
1987年 | 83篇 |
1986年 | 76篇 |
1985年 | 61篇 |
1984年 | 50篇 |
1983年 | 44篇 |
1982年 | 21篇 |
1981年 | 27篇 |
1980年 | 23篇 |
1979年 | 44篇 |
1978年 | 32篇 |
1976年 | 33篇 |
1975年 | 28篇 |
1974年 | 28篇 |
1973年 | 28篇 |
排序方式: 共有6776条查询结果,搜索用时 140 毫秒
1.
2.
3.
4.
Kragh Thomsen M. Rasmussen M. Fuursted K. 《世界核心医学期刊文摘》2006,2(9):2-22
2000年11月,作者得知从Aarhus大学医院皮肤科患者分离到的金黄色葡萄球菌对苯唑西林出现界线耐药(BORSA)。本文旨在描述其表型和基因型,并评估可能的传播途径以干预和阻止进一步蔓延。菌株由脉冲场凝胶电泳鉴定。几个感染控制方案的缺口显示患者间可直接或间接传播。皮肤屏障缺陷、皮肤病患者金黄色葡萄球菌的高携带率和院内双氯西林的高消耗率可促使传播。改善普通感染控制措施和重新评价院内抗生素政策后,该菌的暴发感染消失。 相似文献
5.
Dr. Arthur A. Dunk MRCP Natasha Kyprianou MSc Peter Davies PhD Howard C. Thomas PhD FRCP 《Digestive diseases and sciences》1988,33(4):472-476
Castrated or sham-operated male athymic mice were inoculated with cells from the human hepatocellular carcinoma cell line PLC/PRF/5. There were no significant differences between the two groups with respect to the number of animals developing tumors, the time to tumor development, or the subsequent rate of increase in either tumor base area or mouse serum alpha-fetoprotein concentration. Androgen receptors were assayed in nuclei obtained from three separate liver cancer cell lines and from normal adult human liver. Similar concentrations, ranging from 235 to 550 fmol/mg DNA, of nuclear androgen receptors were detected in all tissues. Low percentages of androgen receptors were retained on DNA-cellulose. Although the presence of receptors implies the potential for metabolic effects of androgens in normal and malignant liver, our in vivostudies suggest that castration does not alter significantly the growth of liver cancer xenografts in athymic mice. 相似文献
6.
K Thomsen B J Riis J S Johansen C Christiansen P R?dbro 《Gynecological endocrinology》1987,1(2):169-175
Bone turnover before and after withdrawal of estrogen/gestagen treatment was studied in a randomized trial with 110 healthy female volunteers, who had passed a natural menopause 6 months to 3 years before the start of the study. Urinary excretion of intravenously injected 99m-technetium diphosphonate was measured as an index of bone turnover; plasma bone Gla protein and serum alkaline phosphatase were measured as indices of bone formation; and fasting urinary excretion of hydroxyproline and calcium were measured as estimates of bone resorption. During 2 years of hormone treatment, all variables decreased highly significantly (p less than 0.001) to a constant low level. Three months after withdrawal all variables increased highly significantly (p less than 0.001) towards, but not above, pretreatment and placebo levels. We conclude that withdrawal of estrogen/gestagen replacement therapy in postmenopausal women increases bone turnover, but not in excess of pretreatment values. This indicates that bone loss (after withdrawal) is similar to that seen in the placebo group and that a rebound phenomenon is unlikely. 相似文献
7.
8.
U. Tage-Jensen P. Schlichting H. F. Thomsen G. Hybye Aa. C. Thomsen 《Liver international》1987,7(2):81-83
ABSTRACT— One hundred and fifty-four patients with histologically verified nonalcoholic chronic liver disease were randomized to azathioprine or prednisone treatment. After a median of 91 months observation time, the cause of death was assessed retrospectively. Autopsy was performed in 82% of 71 deaths. In the azathioprine group 33% (13/39) died from malignant neoplasia, and in the prednisone group (13%) (4/32) (p = 0.08). Considering a possible fatal outcome as a consequence of treatment, this finding urges caution in the long-term application of azathioprine at the usual dose level. 相似文献
9.
10.
There is a dearth of research examining treatment engagement and attendance among runaway youth and their families. Such research is needed in order to inform treatment providers on factors associated with engagement and maintenance of these difficult to engage families into counseling. This study examined differential treatment attendance for alcohol abusing runaway youth residing at a local shelter. A traditional office-based family systems approach, Functional Family Therapy (FFT), was compared to a non-traditional, home-based, multi-systemic family therapy approach, Ecologically Based Family Therapy (EBFT). As expected, treatment engagement and attendance was significantly higher for those assigned to EBFT (N = 37) compared to FFT (N = 40). Predictors of treatment attendance (income, family chaos, externalization problems and level of youth substance use) were examined within each treatment modality. Findings suggest that home-based (compared to office-based) treatment modalities may significantly increase treatment attendance and engagement of runaway youth and their families. Non-traditional forms of treatment may need to be considered in order to best meet the needs of highly chaotic and disorganized family systems. 相似文献