全文获取类型
收费全文 | 14752篇 |
免费 | 1345篇 |
国内免费 | 27篇 |
专业分类
耳鼻咽喉 | 188篇 |
儿科学 | 400篇 |
妇产科学 | 317篇 |
基础医学 | 1974篇 |
口腔科学 | 470篇 |
临床医学 | 1370篇 |
内科学 | 3084篇 |
皮肤病学 | 224篇 |
神经病学 | 1564篇 |
特种医学 | 372篇 |
外科学 | 2006篇 |
综合类 | 325篇 |
一般理论 | 14篇 |
预防医学 | 1680篇 |
眼科学 | 470篇 |
药学 | 830篇 |
中国医学 | 15篇 |
肿瘤学 | 821篇 |
出版年
2021年 | 206篇 |
2020年 | 100篇 |
2019年 | 174篇 |
2018年 | 242篇 |
2017年 | 164篇 |
2016年 | 143篇 |
2015年 | 185篇 |
2014年 | 272篇 |
2013年 | 556篇 |
2012年 | 656篇 |
2011年 | 714篇 |
2010年 | 408篇 |
2009年 | 398篇 |
2008年 | 677篇 |
2007年 | 763篇 |
2006年 | 754篇 |
2005年 | 760篇 |
2004年 | 800篇 |
2003年 | 752篇 |
2002年 | 733篇 |
2001年 | 241篇 |
2000年 | 244篇 |
1999年 | 214篇 |
1998年 | 172篇 |
1997年 | 164篇 |
1996年 | 130篇 |
1995年 | 124篇 |
1994年 | 141篇 |
1993年 | 153篇 |
1992年 | 175篇 |
1991年 | 187篇 |
1990年 | 155篇 |
1989年 | 166篇 |
1988年 | 176篇 |
1987年 | 146篇 |
1986年 | 151篇 |
1985年 | 151篇 |
1984年 | 180篇 |
1983年 | 168篇 |
1982年 | 211篇 |
1981年 | 189篇 |
1980年 | 217篇 |
1979年 | 147篇 |
1978年 | 183篇 |
1977年 | 167篇 |
1976年 | 151篇 |
1975年 | 112篇 |
1974年 | 114篇 |
1973年 | 128篇 |
1972年 | 107篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Objective
The aim of this paper is to study the opportunity costs (OC) that are involved in being a caregiver and to compare them with the direct costs assumed by the State and the families. We evaluate direct cost (those that imply a payment-out-of-pocket) and indirect cost (those that imply a dedication in time). We hypothesized that costs increase with the severity of the dementia, with the educational level and active occupational situation of caregiver. They are greater if the caregiver is male, but if the patient and caregiver cohabit they are reduced.Method
778 surveys were analyzed. Data was collected using a questionnaire specifically designed for the purpose, with the collaboration of Alzheimer's Diseases Associations in Andalusia (Spain). For the indirect cost, we used the reveal preferences method. For the comparison between groups an ANOVA and a MANOVA was done.Results
The hypotheses were confirmed. The OC exponentially increases with severity. More than 55% of costs are assumed by families. Occupied people have higher educational level and incomes and contract more external support. Costs are significantly higher for male caregivers. Cohabiting reduces all kinds of costs.Conclusions
The relationship between educational level and employment situation lead to think that if these variables are greater more people will seek professional support. Cultural reasons still maintain women as main caregivers for all educational levels. The existence of these informal caregivers as the main care providers is a saving for the State, and a brake for the development of professional supply. 相似文献2.
3.
4.
Pitfalls in diagnosis of aortic dissection by angiography: Algorithmic approach utilizing CT and MRI
Harold L. Mast David H. Gordon Alan M. Kantor 《Computerized medical imaging and graphics》1991,15(6):431-440
Dissection of the thoracic aorta is a life-threatening event requiring imaging studies to define the level of the tear and the intinmal flap. The “gold standard” has been angiography. This method may fail to demonstrate the dissection, however, due to overlap of the true and false lumens or a very thin flap that is imaged en face rather than tangentially. Computed tomography has a diagnostic accuracy of 95%, but can fail to image the dissection due to technical factors or a thrombosed false hunen. Magnetic resonance imaging requires a hemodynamically stable and cooperative patient. A diagnostic algorithm is proposed for diagnosis of aortic dissection based on renal function and the surgeon's imaging modality preference. 相似文献
5.
6.
7.
8.
Harold T. Kyriazi George E. Carvell Joshua C. Brumberg Daniel J. Simons 《Brain research》1996,712(2):325
Extracellular single-unit recordings were made in somatosensory cortical barrels of fentanyl-sedated rats. Whiskers were deflected singly or in paired combinations. lontophoretically-applied (−)-baclofen disproportionately reduced weak responses, and phaclofen disproportionately increased them, resulting in more tightly focused or more broadly focused receptive fields, respectively. Both drugs had only minor effects on surround inhibition. In light of previous findings, we conclude that GABAA and GABAB mechanisms both act to enhance spatial contrast, but that the former plays a much greater role in enhancing temporal resolution. 相似文献
9.
D G Omdal D E Baird B S Burton W W Goodhue Jr E M Giddens 《AJNR. American journal of neuroradiology》1997,18(5):977
We describe a myelolipoma of the thoracic spine in a patient with gradual and progressive myelopathy. MR imaging showed this predominately fatty lesion to be extradural in location. 相似文献
10.
James L. Levenson M.D. Harold J. Fallon M.D. 《The American journal of gastroenterology》1993,88(5):760-761
Interferon-α is the only approved and effective treatment for hepatitis C. Psychiatric side effects are common and have frequently required a decrease in dose or discontinuation of therapy. We here report a case of interferon-α-induced depression in a 40-yr-old man with hepatitis C successfully treated with the antidepressant fluoxetine, which allowed completion of interferon treatment. 相似文献