全文获取类型
收费全文 | 3554篇 |
免费 | 198篇 |
国内免费 | 22篇 |
专业分类
耳鼻咽喉 | 8篇 |
儿科学 | 94篇 |
妇产科学 | 88篇 |
基础医学 | 688篇 |
口腔科学 | 62篇 |
临床医学 | 435篇 |
内科学 | 731篇 |
皮肤病学 | 71篇 |
神经病学 | 280篇 |
特种医学 | 75篇 |
外科学 | 280篇 |
综合类 | 28篇 |
一般理论 | 1篇 |
预防医学 | 295篇 |
眼科学 | 59篇 |
药学 | 351篇 |
中国医学 | 8篇 |
肿瘤学 | 220篇 |
出版年
2023年 | 32篇 |
2022年 | 82篇 |
2021年 | 135篇 |
2020年 | 83篇 |
2019年 | 118篇 |
2018年 | 106篇 |
2017年 | 74篇 |
2016年 | 109篇 |
2015年 | 92篇 |
2014年 | 152篇 |
2013年 | 148篇 |
2012年 | 276篇 |
2011年 | 260篇 |
2010年 | 132篇 |
2009年 | 119篇 |
2008年 | 180篇 |
2007年 | 175篇 |
2006年 | 165篇 |
2005年 | 162篇 |
2004年 | 180篇 |
2003年 | 158篇 |
2002年 | 114篇 |
2001年 | 26篇 |
2000年 | 28篇 |
1999年 | 30篇 |
1998年 | 20篇 |
1997年 | 26篇 |
1996年 | 15篇 |
1995年 | 19篇 |
1993年 | 17篇 |
1992年 | 28篇 |
1991年 | 33篇 |
1990年 | 38篇 |
1989年 | 31篇 |
1988年 | 24篇 |
1987年 | 40篇 |
1986年 | 31篇 |
1985年 | 27篇 |
1984年 | 19篇 |
1983年 | 13篇 |
1979年 | 28篇 |
1978年 | 13篇 |
1977年 | 15篇 |
1976年 | 19篇 |
1975年 | 16篇 |
1974年 | 17篇 |
1972年 | 14篇 |
1970年 | 12篇 |
1969年 | 13篇 |
1968年 | 12篇 |
排序方式: 共有3774条查询结果,搜索用时 31 毫秒
1.
Sania Amr Magdy Garas Dina N. K. Boulos Doa’a A. Saleh Irene A. Jillson Christopher A. Loffredo 《Journal of substance use》2019,24(3):341-345
Background: Egyptian street youth use substances including tobacco, illicit drugs, and pharmaceutical drugs. To understand the circumstances, including adverse childhood experiences, that place adolescents at risk for engaging in substance use, we conducted in-depth interviews among a sample of Egyptian street children. Methods: From youth residing at or attending Caritas, a non-profit organization, which provides shelter and education to street youth, seven girls and twelve boys, aged 12–18 years, participated in open-ended, in-depth interviews. Results: Eight out of the 19 participants reported family history (early exposure) to substance use; and seven of them were initiated by either a family member (sibling), friend or coworker. Most of the participants reported a history of conflict with or abuse (verbal or physical) by their parents or siblings, or stressful situations at home; they used substance(s) to alleviate their stress. Few attended school, and some were forced to work and help their family. Conclusions: Among Egyptian youth, adverse childhood experiences, such as poverty, child abuse, and family substance use, challenge somewhat susceptible youths and lead them to the path of substance use and addiction. Prevention intervention should be multifaceted, culturally adaptable, and primarily targeting the social environment during childhood. 相似文献
2.
3.
S. V. Terent’eva E. N. Komarova T. N. Sapozhnikova A. T. Teplyakov E. A. Ivanovskaya T. I. Andreeva 《Pharmaceutical Chemistry Journal》2006,40(12):694-696
A rapid procedure for determining angiotensin II in the blood by inverse voltammetry using a TA-2 device (Tekhnoanalit Company,
Tomsk) with a graphite electrode has been developed. The results of analyses using the proposed technique agree with the clinical
data. The rapid analytical procedure favors optimization of cardiotropic drug therapy.
__________
Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 40, No. 12, pp. 54–56, December, 2006. 相似文献
4.
Abnormal magnetic-resonance scans of the lumbar spine in asymptomatic subjects. A prospective investigation 总被引:36,自引:0,他引:36
S D Boden D O Davis T S Dina N J Patronas S W Wiesel 《The Journal of bone and joint surgery. American volume》1990,72(3):403-408
We performed magnetic resonance imaging on sixty-seven individuals who had never had low-back pain, sciatica, or neurogenic claudication. The scans were interpreted independently by three neuro-radiologists who had no knowledge about the presence or absence of clinical symptoms in the subjects. About one-third of the subjects were found to have a substantial abnormality. Of those who were less than sixty years old, 20 per cent had a herniated nucleus pulposus and one had spinal stenosis. In the group that was sixty years old or older, the findings were abnormal on about 57 per cent of the scans: 36 per cent of the subjects had a herniated nucleus pulposus and 21 per cent had spinal stenosis. There was degeneration or bulging of a disc at at least one lumbar level in 35 per cent of the subjects between twenty and thirty-nine years old and in all but one of the sixty to eighty-year-old subjects. In view of these findings in asymptomatic subjects, we concluded that abnormalities on magnetic resonance images must be strictly correlated with age and any clinical signs and symptoms before operative treatment is contemplated. 相似文献
5.
6.
7.
8.
David S. Ball D.O. Arnold C. Friedman David S. Hartman Paul D. Radecki Dina F. Caroline 《Urologic radiology》1986,8(1):46-48
This case report illustrates the magnetic resonance imaging (MRI) appearance of a typically asymptomatic renal oncocytoma as a homogeneous mass of medium signal with a stellate central region of decreased signal, representing the central scar. The MRI was correlated with computed tomography (CT), ultrasound (US), and gross pathologic appearance. The appearance of a central scar is not specific for oncocytoma and does not exclude renal cell carcinoma, as illustrated by a second case. 相似文献
9.
Background
Exercise has been recommended for improving global-well being in adults with fibromyalgia. However, no meta-analysis has determined the effects of exercise on global well-being using a single instrument and when analyzed separately according to intention-to-treat and per-protocol analyses. The purpose of this study was to fill that gap. 相似文献10.