全文获取类型
收费全文 | 2408篇 |
免费 | 113篇 |
国内免费 | 24篇 |
专业分类
耳鼻咽喉 | 58篇 |
儿科学 | 142篇 |
妇产科学 | 336篇 |
基础医学 | 192篇 |
口腔科学 | 66篇 |
临床医学 | 193篇 |
内科学 | 460篇 |
皮肤病学 | 14篇 |
神经病学 | 68篇 |
特种医学 | 356篇 |
外科学 | 203篇 |
综合类 | 31篇 |
一般理论 | 2篇 |
预防医学 | 181篇 |
眼科学 | 58篇 |
药学 | 94篇 |
中国医学 | 2篇 |
肿瘤学 | 89篇 |
出版年
2021年 | 26篇 |
2020年 | 15篇 |
2018年 | 32篇 |
2017年 | 12篇 |
2016年 | 17篇 |
2015年 | 26篇 |
2014年 | 32篇 |
2013年 | 44篇 |
2012年 | 58篇 |
2011年 | 61篇 |
2010年 | 54篇 |
2009年 | 44篇 |
2008年 | 62篇 |
2007年 | 92篇 |
2006年 | 92篇 |
2005年 | 88篇 |
2004年 | 78篇 |
2003年 | 70篇 |
2002年 | 60篇 |
2001年 | 74篇 |
2000年 | 65篇 |
1999年 | 73篇 |
1998年 | 50篇 |
1997年 | 51篇 |
1996年 | 66篇 |
1995年 | 57篇 |
1994年 | 43篇 |
1993年 | 48篇 |
1992年 | 56篇 |
1991年 | 54篇 |
1990年 | 62篇 |
1989年 | 72篇 |
1988年 | 80篇 |
1987年 | 76篇 |
1986年 | 71篇 |
1985年 | 91篇 |
1984年 | 59篇 |
1983年 | 46篇 |
1982年 | 47篇 |
1981年 | 41篇 |
1980年 | 28篇 |
1979年 | 33篇 |
1978年 | 22篇 |
1977年 | 42篇 |
1976年 | 33篇 |
1975年 | 27篇 |
1974年 | 17篇 |
1971年 | 15篇 |
1970年 | 12篇 |
1969年 | 12篇 |
排序方式: 共有2545条查询结果,搜索用时 15 毫秒
1.
2.
J M Berkowitz 《Journal of medical ethics》1991,17(3):136-137
After recently meeting with his biological parents, the author--a 29-year-old-married male--learned he had been an hour away from being aborted, being 'saved' only by extraordinary circumstances. In the paper the author reflects upon previous strong pro-choice beliefs and reasserts his commitment to a pro-choice philosophy, integrating his new personal experience. The paper pays particular attention to the biological mother's experience and how her fresh insights have reinforced the author's views on abortion. 相似文献
3.
Conscientious surveillance of intrainguinal bypass grafts is mandatory to detect vein graft stenoses, which, if uncorrected, can lead to graft occlusion. It is now widely accepted that noninvasive vascular laboratory studies are the best way to detect these lesions. However, controversy still exists over treatment, specifically whether balloon angioplasty is an acceptable substitute for surgery (patch angioplasty or short jump grafts) in the treatment of these lesions. We have always favored balloon angioplasty as primary treatment and have summarized our experience with treating 72 stenotic reversed femoropopliteal and femorotibial vein grafts, which represent 12% of 521 bypass grafts performed at our institution. Prosthetic and in situ grafts are specifically excluded from this report, as well as occluded grafts, found to have stenotic lesions after lytic therapy. The most common stenotic lesion occurred within 4 cm of the proximal anastomosis (29/72 = 40%). The other sites were near the distal anastomosis (7/72 = 10%), and in the middle of the graft (15/72 = 12%). Eighty-one percent (58/72) of the lesions were treated initially by balloon angioplasty with a 31% recurrence. Twenty-nine percent of the 14 grafts treated surgically by vein patch angioplasty or short jump grafts experienced recurrence. Overall 61% (44/72) of the stenotic grafts were treated by balloon angioplasty alone. The 5-year life-table assisted primary patency after correction of the stenotic lesion was 61%. The patency of the grafts from the time of initial bypass surgery, however, was 80%. Location of the stenosis within the graft was a major determinant of patency. Lesions in the proximal graft, proximal anastomosis, and distal graft taken as a group had significantly better patency than the midgraft and distal anastomotic lesions (5-year patency, 65% vs 48%, p less than 0.001 log rank test). We continue to recommend balloon angioplasty as primary therapy for vein graft stenosis except for those occurring in the midgraft and distal anastomosis. Fortunately, this group accounts for only 36% of lesions seen with reversed veins. Recurrent stenosis after balloon angioplasty should be repaired surgically. 相似文献
4.
5.
6.
Decrements in vigilance and cognitive functioning associated with ragweed-induced allergic rhinitis. 总被引:2,自引:0,他引:2
Jeffrey A Wilken Robert Berkowitz Robert Kane 《Annals of allergy, asthma & immunology》2002,89(4):372-380
BACKGROUND AND OBJECTIVE: The adverse effects of untreated seasonal allergic rhinitis (AR) on performance in the workplace, school, and home are poorly understood. To delineate more clearly the impact and consequences of the disease on performance, the effect of symptomatic AR on vigilance and a wide range of cognitive functions was investigated. METHODS: A battery of automated neuropsychological tests was administered to asymptomatic adult subjects with histories of AR. Subjects were randomized to either a symptomatic or to an asymptomatic group. Subjects in the symptomatic group were exposed to ragweed pollen in a controlled exposure setting until they demonstrated predetermined severities of AR symptoms. Subjects in the asymptomatic group were not exposed to ragweed pollen in the environmental unit and retained a minimum symptom profile. The battery of cognitive measures was re-administered to both groups. RESULTS: AR had major adverse impacts on measures of vigilance. Further, AR adversely affected a broad range of cognitive functions. Specifically, subjects with AR symptoms demonstrated longer response times and decreased efficiency on measures of working memory, psychomotor speed, reasoning/computation, and divided attention as compared with asymptomatic subjects. CONCLUSIONS: In addition to decreased vigilance, AR was associated with decrements in speed and efficiency across several cognitive domains. This is similar to findings in research on medications and medical conditions that cause sedation. Findings may represent a link between AR and poor productivity/personal safety among AR sufferers. This suggests that these results have implications with regard to public health. 相似文献
7.
8.
9.
10.