全文获取类型
收费全文 | 6436篇 |
免费 | 484篇 |
国内免费 | 14篇 |
专业分类
耳鼻咽喉 | 81篇 |
儿科学 | 309篇 |
妇产科学 | 121篇 |
基础医学 | 966篇 |
口腔科学 | 57篇 |
临床医学 | 645篇 |
内科学 | 1336篇 |
皮肤病学 | 102篇 |
神经病学 | 708篇 |
特种医学 | 194篇 |
外国民族医学 | 10篇 |
外科学 | 679篇 |
综合类 | 43篇 |
一般理论 | 1篇 |
预防医学 | 738篇 |
眼科学 | 83篇 |
药学 | 358篇 |
中国医学 | 2篇 |
肿瘤学 | 501篇 |
出版年
2023年 | 84篇 |
2022年 | 115篇 |
2021年 | 219篇 |
2020年 | 161篇 |
2019年 | 217篇 |
2018年 | 251篇 |
2017年 | 156篇 |
2016年 | 160篇 |
2015年 | 195篇 |
2014年 | 259篇 |
2013年 | 316篇 |
2012年 | 444篇 |
2011年 | 434篇 |
2010年 | 251篇 |
2009年 | 200篇 |
2008年 | 321篇 |
2007年 | 346篇 |
2006年 | 297篇 |
2005年 | 293篇 |
2004年 | 242篇 |
2003年 | 217篇 |
2002年 | 194篇 |
2001年 | 114篇 |
2000年 | 100篇 |
1999年 | 113篇 |
1998年 | 53篇 |
1997年 | 38篇 |
1996年 | 33篇 |
1995年 | 27篇 |
1994年 | 31篇 |
1993年 | 27篇 |
1992年 | 68篇 |
1991年 | 71篇 |
1990年 | 78篇 |
1989年 | 74篇 |
1988年 | 73篇 |
1987年 | 42篇 |
1986年 | 59篇 |
1985年 | 57篇 |
1984年 | 55篇 |
1983年 | 56篇 |
1982年 | 37篇 |
1979年 | 38篇 |
1978年 | 31篇 |
1977年 | 26篇 |
1975年 | 26篇 |
1974年 | 25篇 |
1972年 | 23篇 |
1971年 | 19篇 |
1970年 | 22篇 |
排序方式: 共有6934条查询结果,搜索用时 15 毫秒
1.
2.
3.
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
4.
5.
6.
7.
Absence of the amyloid precursor protein gene mutation (APP717: Val->Ile) in 85 cases of early onset Alzheimer''s disease. 下载免费PDF全文
8.
Somaini Bertino Billo Nils Dubois Jean-Alain Staub Roger 《International journal of public health》1988,33(7):340-344
International Journal of Public Health - Die Übertragungswege des HIV, welche in der Bevölkerung eine Rolle spielen, sind heute bekannt. Neben der sexuellen Übertragung, der... 相似文献
9.
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
10.
Mario Sénéchal Isabelle Lemieux Isabel Beucler Gerard Drobinski Sylvie Cormont Michelle Dubois Iradj Gandjbakhch Jean-Pierre Després Richard Dorent 《The Journal of heart and lung transplantation》2005,24(7):819-826
BACKGROUND: This study evaluated the prevalence of the atherogenic metabolic triad and the hypothesis that waist circumference and fasting triglyceride concentrations could be used as screening tools for identification of the atherogenic metabolic triad in a population of heart transplant men. It also evaluated the relationship between the atherogenic metabolic triad and coronary artery disease (CAD). METHODS: In the study group of 83 consecutive male heart transplant patients having their routine annual coronarography, 23 patients (28%) were characterized by the atherogenic metabolic triad defined by the presence of elevated fasting insulin and apolipoprotein B concentrations and by small low-density lipoprotein (LDL) particles. RESULTS: Seventy-seven per cent of patients with waist circumference values >/= 90 cm and with elevated triglyceride levels (>/=2.0 mmol/liter) were characterized by this atherogenic metabolic triad. Patients with the atherogenic metabolic triad were at markedly increased risk of CAD (odds ratio of 25.3, 95% CI: 1.11-577.3, p < 0.04) compared to heart transplant patients without the atherogenic metabolic triad. CONCLUSIONS: About 30% of heart transplant patients showed the features of the atherogenic metabolic triad. Measurement and interpretation of waist circumference and fasting triglycerides could be used among heart transplant patients to early identify men characterized by the presence of elevated fasting insulin and apolipoprotein B concentrations and small LDL particles. The presence of the atherogenic metabolic triad identified patients at high risk of CAD even in the heart transplant population. 相似文献