全文获取类型
收费全文 | 1589篇 |
免费 | 121篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 60篇 |
妇产科学 | 6篇 |
基础医学 | 227篇 |
口腔科学 | 63篇 |
临床医学 | 92篇 |
内科学 | 236篇 |
皮肤病学 | 68篇 |
神经病学 | 100篇 |
特种医学 | 96篇 |
外科学 | 262篇 |
综合类 | 281篇 |
预防医学 | 77篇 |
眼科学 | 7篇 |
药学 | 59篇 |
1篇 | |
肿瘤学 | 77篇 |
出版年
2023年 | 17篇 |
2022年 | 23篇 |
2021年 | 50篇 |
2020年 | 31篇 |
2019年 | 40篇 |
2018年 | 38篇 |
2017年 | 27篇 |
2016年 | 28篇 |
2015年 | 52篇 |
2014年 | 48篇 |
2013年 | 55篇 |
2012年 | 66篇 |
2011年 | 60篇 |
2010年 | 98篇 |
2009年 | 70篇 |
2008年 | 99篇 |
2007年 | 87篇 |
2006年 | 81篇 |
2005年 | 60篇 |
2004年 | 68篇 |
2003年 | 51篇 |
2002年 | 57篇 |
2001年 | 66篇 |
2000年 | 41篇 |
1999年 | 36篇 |
1998年 | 29篇 |
1997年 | 36篇 |
1996年 | 33篇 |
1995年 | 24篇 |
1994年 | 26篇 |
1993年 | 10篇 |
1992年 | 15篇 |
1991年 | 15篇 |
1990年 | 16篇 |
1989年 | 16篇 |
1988年 | 12篇 |
1987年 | 15篇 |
1986年 | 12篇 |
1985年 | 11篇 |
1984年 | 9篇 |
1982年 | 6篇 |
1981年 | 9篇 |
1979年 | 9篇 |
1978年 | 12篇 |
1977年 | 6篇 |
1976年 | 9篇 |
1974年 | 4篇 |
1973年 | 3篇 |
1970年 | 6篇 |
1967年 | 3篇 |
排序方式: 共有1716条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
During the time from 1982/83 the intracranial pressure was continuously measured from patients who were polytraumatized and also had severe head injuries. In 53% of these cases the first readings could be obtained within 6 hours after the injury and in 33% first after 12 hours. During the time of evaluation this relationship shifted to earlier implantation. From 27% of these patients the intracranial pressure values fell into a range that instigated immediate therapeutical measures. This proves how important it is to have a direct reading from the intracranial pressure as soon as possible after injury. The aspects of therapy by increased intracranial pressure were discussed. 相似文献
7.
8.
9.
Biochemical characteristics of 130 recent isolates from Haemophilus influenzae meningitis. 总被引:9,自引:4,他引:9 下载免费PDF全文
A total of 130 Haemophilus strains, comprising virtually all isolates from Danish and Norwegian cases of Haemophilus meningitis occurring in the period from October 1975 through September 1976, were examined by biochemical and serological means. All isolates were identified as H. influenzae and, except for one noncapsulated strain, possessed a capsule of serotype b. The vast majority of strains (93%) belonged to biotype I, which, in contrast to biotypes II and III, is rarely encountered as a commensal of the upper respiratory tract. This finding is a strong incentive for studies of possible additional virulence factors associated with biotype I organisms. The results are discussed in the light of North American reports, which have suggested changes in the etiology of Haemophilus meningitis. 相似文献
10.
Lack of cleavage of immunoglobulin A (IgA) from rhesus monkeys by bacterial IgA1 proteases. 总被引:3,自引:1,他引:3 下载免费PDF全文
Bacterial immunoglobulin A1 (IgA1) proteases cleaving IgA1 and secretory IgA1 molecules in the hinge region are believed to be important virulence factors. Previous studies have indicated that IgA of humans, gorillas, and chimpanzees are the exclusive substrates of these enzymes. In a recent study, IgA from the rhesus monkey was found to be susceptible to the IgA1 protease activity of Streptococcus pneumoniae. In an attempt to reproduce this observation, we found that neither five isolates of S. pneumoniae nor other IgA1 protease-producing bacteria representing different cleavage specificities caused cleavage of rhesus monkey IgA. Hence, the rhesus monkey does not appear to be a suitable animal model for studies of IgA1 proteases as virulence factors. 相似文献