全文获取类型
收费全文 | 876篇 |
免费 | 55篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 42篇 |
妇产科学 | 10篇 |
基础医学 | 99篇 |
口腔科学 | 22篇 |
临床医学 | 63篇 |
内科学 | 238篇 |
皮肤病学 | 10篇 |
神经病学 | 69篇 |
特种医学 | 83篇 |
外科学 | 89篇 |
综合类 | 63篇 |
预防医学 | 67篇 |
眼科学 | 12篇 |
药学 | 32篇 |
肿瘤学 | 38篇 |
出版年
2023年 | 2篇 |
2022年 | 7篇 |
2021年 | 23篇 |
2020年 | 6篇 |
2019年 | 9篇 |
2018年 | 15篇 |
2017年 | 12篇 |
2016年 | 16篇 |
2015年 | 25篇 |
2014年 | 25篇 |
2013年 | 32篇 |
2012年 | 40篇 |
2011年 | 34篇 |
2010年 | 32篇 |
2009年 | 50篇 |
2008年 | 34篇 |
2007年 | 43篇 |
2006年 | 61篇 |
2005年 | 18篇 |
2004年 | 23篇 |
2003年 | 17篇 |
2002年 | 18篇 |
2001年 | 19篇 |
2000年 | 15篇 |
1999年 | 20篇 |
1998年 | 45篇 |
1997年 | 33篇 |
1996年 | 42篇 |
1995年 | 19篇 |
1994年 | 19篇 |
1993年 | 24篇 |
1992年 | 11篇 |
1991年 | 13篇 |
1990年 | 5篇 |
1989年 | 13篇 |
1988年 | 27篇 |
1987年 | 14篇 |
1986年 | 10篇 |
1985年 | 18篇 |
1984年 | 8篇 |
1983年 | 6篇 |
1982年 | 5篇 |
1981年 | 3篇 |
1980年 | 5篇 |
1977年 | 3篇 |
1976年 | 7篇 |
1975年 | 4篇 |
1956年 | 1篇 |
1954年 | 1篇 |
1944年 | 1篇 |
排序方式: 共有939条查询结果,搜索用时 15 毫秒
1.
2.
Aaron M Kipp Jennifer A Lehman Richard A Bowen Patricia E Fox Michael R Stephens Kaci Klenk Nicholas Komar Michel L Bunning 《The American journal of tropical medicine and hygiene》2006,75(4):688-690
To better understand the potential environmental health risk presented by West Nile virus (WNV)-contaminated feces, we quantified the amount of WNV present in the feces of experimentally infected American crows (Corvus brachyrhynchos) and fish crows (Corvus ossifragus). Peak fecal titers ranged from 10(3.5) to 10(8.8) plaque-forming units (PFU)/g for 10 American crows and from 10(2.3) to 10(6.4) PFU/g for 10 fish crows. The presence of infectious WNV in bird feces indicates a potential for direct transmission of WNV. Thus, handlers of sick or dead birds should take appropriate precautions to avoid exposure to fecal material. 相似文献
3.
4.
Over a period of years the ventilation system of a community hospital progressively deteriorated until it no longer met regulatory guidelines. The hospital, a publicly funded military facility, requested funding to repair the ventilation system, but funds were not forthcoming because of budget austerity. When an increase in infections was documented, high-risk operations were curtailed and funding was expedited. With the new improved ventilation system the operating rooms once again met regulatory guidelines and infections returned to baseline rates. Throughout the period infections remained below recognized national levels. 相似文献
5.
6.
7.
8.
9.
C. Kaiser W. Kipp G. Asaba C. Mugisa G. Kabagambe D. Rating M. Leichsenring 《Bulletin of the World Health Organization》1996,74(4):361-367
Epidemiological surveys indicate that the prevalence of epilepsy is higher in developing countries than in industrialized countries. Except for neurocystocercosis due to Taenia solium, little is known about possible underlying causes. This article reports the relationship between epilepsy and onchocerciasis in an Onchocerca volvulus endemic area in West Uganda. Individuals complaining of seizures were identified by means of a population census in 12 villages. Active epilepsy was confirmed in 61 of 4743 inhabitants (crude prevalence rate = 1.3%; age-standardized rate = 1.1%). Distribution of epilepsy in the study area was clustered, ranging from a prevalence of 0.2% to 3.4% in different villages. Age-specific prevalence was highest between 10 and 19 years, with a rate of 3.6% for the study are as a whole, and up to 10.0% in villages of high epilepsy prevalence. The prevalence of onchocerciasis in the 10-19-year-old age group was assessed by skin-snip biopsy and ranged from 15% to 85% in different villages. Epilepsy was significantly more frequent in the three villages with the highest levels of O. volvulus endemicity than in other villages (P < 0.0001). Serological testing for T. solium infection was positive in one and borderline in three of 53 epilepsy patients tested. The significant correlation between epilepsy and onchocerciasis did not change when these four patients were excluded from the analysis. These findings suggest a strong association between epilepsy and onchocerciasis in this area. This could have significant implications for the concept of morbidity due to O. volvulus. 相似文献
10.