全文获取类型
收费全文 | 1345篇 |
免费 | 94篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 24篇 |
儿科学 | 62篇 |
妇产科学 | 7篇 |
基础医学 | 108篇 |
口腔科学 | 21篇 |
临床医学 | 81篇 |
内科学 | 143篇 |
皮肤病学 | 41篇 |
神经病学 | 71篇 |
特种医学 | 63篇 |
外科学 | 326篇 |
综合类 | 315篇 |
一般理论 | 1篇 |
预防医学 | 65篇 |
眼科学 | 11篇 |
药学 | 43篇 |
1篇 | |
肿瘤学 | 58篇 |
出版年
2022年 | 7篇 |
2021年 | 15篇 |
2020年 | 17篇 |
2019年 | 17篇 |
2018年 | 15篇 |
2017年 | 17篇 |
2016年 | 16篇 |
2015年 | 35篇 |
2014年 | 33篇 |
2013年 | 41篇 |
2012年 | 42篇 |
2011年 | 57篇 |
2010年 | 77篇 |
2009年 | 62篇 |
2008年 | 61篇 |
2007年 | 67篇 |
2006年 | 66篇 |
2005年 | 62篇 |
2004年 | 75篇 |
2003年 | 42篇 |
2002年 | 43篇 |
2001年 | 48篇 |
2000年 | 32篇 |
1999年 | 35篇 |
1998年 | 34篇 |
1997年 | 35篇 |
1996年 | 42篇 |
1995年 | 19篇 |
1994年 | 27篇 |
1993年 | 15篇 |
1992年 | 17篇 |
1991年 | 17篇 |
1990年 | 18篇 |
1989年 | 28篇 |
1988年 | 33篇 |
1987年 | 15篇 |
1986年 | 21篇 |
1985年 | 18篇 |
1984年 | 17篇 |
1983年 | 9篇 |
1982年 | 8篇 |
1979年 | 6篇 |
1978年 | 10篇 |
1977年 | 7篇 |
1976年 | 9篇 |
1975年 | 6篇 |
1974年 | 6篇 |
1973年 | 7篇 |
1972年 | 6篇 |
1970年 | 6篇 |
排序方式: 共有1441条查询结果,搜索用时 15 毫秒
1.
Previous studies of giant axonal neuropathy have reported clinical and pathological findings that indicate involvement of the central nervous system. We studied 3 boys with giant axonal neuropathy, who were 14 to 16 years of age, using auditory, visual, and somatosensory evoked potentials. Absence of waveforms and prolongation of peak and interwave latencies were found. Abnormalities were noted in all modalities. The auditory brainstem evoked response in particular indicated a significant increase in brainstem conduction time. These studies add clinical neurophysiological confirmation of the central nervous system involvement in this disorder and may also provide a means of quantitative evaluation of its progression. 相似文献
2.
3.
4.
5.
6.
7.
Use of triple-lumen subclavian catheters for administration of total parenteral nutrition. 总被引:1,自引:0,他引:1
N Clark-Christoff V A Watters W Sparks P Snyder J P Grant 《JPEN. Journal of parenteral and enteral nutrition》1992,16(5):403-407
This study evaluated the safety of triple vs single-lumen catheters in intravenous nutrition. Patients who were judged likely to benefit from a triple-lumen catheter were randomized to receive either a single-lumen catheter, with additional peripheral or central venous access as needed, or a triple-lumen catheter. All patients were at increased risk of catheter-related infection because of one or more of the following conditions: > 60 years of age, breakdown of skin integrity, severe underlying illness, diagnosis of acute pancreatitis, recent head or neck surgery, or presence of a preexisting infection. Patients were excluded who had neutropenia, were immunosuppressed, had body burns > 40%, or had contaminated wounds in the subclavicular area. Of 204 patients entered between June 1989 and November 1991, 177 completed the required > or = 7 days of therapy. Seventy-eight of these patients were randomized to a single-lumen catheter and 99 to a triple-lumen catheter. Catheters were inserted and maintained by the Nutrition Support Team. Dressings were monitored daily and changed weekly using a bio-occlusive dressing. When parameters were met for a possible septic episode, simultaneous peripheral and central catheter blood cultures were obtained using the Isolator method. Catheter-related sepsis was considered present if the colony count from a central catheter lumen was > or = 5 times that of the peripheral blood. The incidence of catheter-related sepsis for single-lumen catheters was 2.6% (2 of 78) compared with 13.1% for triple-lumen catheters (13 of 99) (p < .01). No correlation was found with the number of insertion attempts, catheter days, or patient's age.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
8.
9.
D Chitayat K A Hodgkinson O Ginsburg J Dimmick G V Watters 《American journal of medical genetics》1992,43(6):954-956
We report on a patient with myopathy, kyphoscoliosis, joint contractures, and a facial appearance consistent with King syndrome. Unlike other reported cases, our patient had hyperextensible joints, normal stature, and pectus excavatum. The cardiac ventricles, aorta, and pulmonary artery were dilated. Malignant hyperthermia did not occur under anaesthesia although there was a transient increase in CK levels. Muscle bulk and tone were significantly decreased but collagen and elastin fibres were normal. The variable clinical presentation of King syndrome suggests that the manifestations are caused by different congenital myopathies and in all cases there is probably an increased risk of malignant hyperthermia. 相似文献
10.
A monoclonal antibody capable of blocking the biological activity of the ciliary neurotrophic factor purified from bovine cardiac muscle has been produced. This antibody, when administered perinatally to mice, causes a failure of the normal development of the parasympathetic innervation of the iris as determined by assay for the activity of the cholinergic marker enzyme choline acetyltransferase. The same treatment has no effect on the adrenergic neuronal marker, tyrosine hydroxylase. This immunoparasympathectomy suggests that the ciliary neurotrophic factor has an essential role in regulating the development of the mammalian parasympathetic nervous system. 相似文献