全文获取类型
收费全文 | 915篇 |
免费 | 68篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 8篇 |
儿科学 | 42篇 |
妇产科学 | 17篇 |
基础医学 | 124篇 |
口腔科学 | 30篇 |
临床医学 | 64篇 |
内科学 | 176篇 |
皮肤病学 | 23篇 |
神经病学 | 42篇 |
特种医学 | 147篇 |
外国民族医学 | 1篇 |
外科学 | 71篇 |
综合类 | 54篇 |
预防医学 | 69篇 |
眼科学 | 7篇 |
药学 | 34篇 |
中国医学 | 4篇 |
肿瘤学 | 74篇 |
出版年
2023年 | 6篇 |
2021年 | 15篇 |
2020年 | 11篇 |
2019年 | 6篇 |
2018年 | 22篇 |
2017年 | 14篇 |
2016年 | 17篇 |
2015年 | 14篇 |
2014年 | 28篇 |
2013年 | 48篇 |
2012年 | 46篇 |
2011年 | 33篇 |
2010年 | 49篇 |
2009年 | 59篇 |
2008年 | 40篇 |
2007年 | 33篇 |
2006年 | 24篇 |
2005年 | 28篇 |
2004年 | 24篇 |
2003年 | 15篇 |
2002年 | 11篇 |
2001年 | 12篇 |
2000年 | 12篇 |
1999年 | 14篇 |
1998年 | 40篇 |
1997年 | 39篇 |
1996年 | 35篇 |
1995年 | 35篇 |
1994年 | 24篇 |
1993年 | 21篇 |
1992年 | 8篇 |
1991年 | 7篇 |
1990年 | 9篇 |
1989年 | 17篇 |
1988年 | 18篇 |
1987年 | 12篇 |
1986年 | 16篇 |
1985年 | 12篇 |
1984年 | 12篇 |
1983年 | 15篇 |
1982年 | 12篇 |
1981年 | 13篇 |
1980年 | 15篇 |
1979年 | 4篇 |
1978年 | 8篇 |
1976年 | 8篇 |
1975年 | 5篇 |
1968年 | 3篇 |
1967年 | 2篇 |
1966年 | 3篇 |
排序方式: 共有987条查询结果,搜索用时 18 毫秒
1.
Skeletal muscle blood flow and venous capacitance in patients with severe sepsis and systemic hypoperfusion 总被引:2,自引:0,他引:2
Alterations in peripheral vascular tone are presumed to contribute to circulatory failure during severe sepsis. Decreased venous tone with venous pooling may decrease effective circulatory blood volume, while decreased arterial tone with redistribution of systemic blood may compromise tissue nutrient flow. We compared forearm arterial and venous tone and forearm blood flow in ten patients with and ten patients without sepsis. The FVT, MVC, and FBF were measured by air plethysmography. In the septic patients, MCV was 1.4 +/- 0.1 ml compared with 3.1 +/- 0.2 ml in nonseptic patients (p less than 0.01). The FVT was 13.4 +/- 1.0 mm Hg/ml in septic patients versus 7.0 +/- 0.5 mm Hg/ml in nonseptic patients (p less than 0.01). The ratio of FBF to cardiac output was 0.28 +/- 0.07 percent in septic patients and 0.31 +/- 0.07 percent in nonseptic patients. These data suggest that increased peripheral venous capacitance and redistribution of skeletal muscle blood flow are not present in patients with sepsis. 相似文献
2.
3.
E MOLKE JENSEN K. A. THIESSEN AA. CHRISTENSEN 《Acta anaesthesiologica Scandinavica》1986,30(2):109-110
The effect of 4 mg oral naloxone on preoperative gastric volume and pH of gastric aspirate was studied in a double-blind, randomized study. Twenty patients received 10 ml of naloxone (4 mg) mixed with 10 ml of orange juice, and 20 patients received 10 ml of isotonic saline mixed with 10 ml of orange juice, 2 h before surgery. Gastric content was obtained immediately after intubation of the trachea. No significant difference in gastric volume and pH of gastric aspirate was found between the two groups. It is concluded that naloxone does not affect gastric emptying and gastric acid secretion to a degree great enough to protect against aspiration of gastric contents into the lungs. 相似文献
4.
5.
6.
7.
8.
Effect of a high affinity aluminosilicate sorbent on prevention of aflatoxicosis in growing pigs 总被引:1,自引:0,他引:1
B M Colvin L T Sangster K D Haydon R W Beaver D M Wilson 《Veterinary and human toxicology》1989,31(1):46-48
Adding 0.5% hydrated sodium calcium aluminosilicate to diets formulated with aflatoxin-contaminated corn significantly reduced the detrimental effects of the mycotoxin on live weight gains and feed intake. Hepatocellular changes normally associated with aflatoxin consumption could not be detected histopathologically in liver sections from pigs fed contaminated diets plus the aluminosilicate sorbent. 相似文献
9.
10.