全文获取类型
收费全文 | 475篇 |
免费 | 24篇 |
国内免费 | 19篇 |
专业分类
儿科学 | 25篇 |
基础医学 | 29篇 |
口腔科学 | 8篇 |
临床医学 | 42篇 |
内科学 | 123篇 |
皮肤病学 | 4篇 |
神经病学 | 6篇 |
特种医学 | 157篇 |
外科学 | 25篇 |
综合类 | 11篇 |
预防医学 | 13篇 |
眼科学 | 37篇 |
药学 | 25篇 |
2篇 | |
肿瘤学 | 11篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2018年 | 4篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2015年 | 4篇 |
2014年 | 3篇 |
2013年 | 4篇 |
2012年 | 7篇 |
2011年 | 5篇 |
2010年 | 6篇 |
2009年 | 9篇 |
2008年 | 9篇 |
2007年 | 22篇 |
2006年 | 6篇 |
2005年 | 4篇 |
2004年 | 8篇 |
2003年 | 4篇 |
2002年 | 11篇 |
2001年 | 2篇 |
2000年 | 7篇 |
1999年 | 11篇 |
1998年 | 28篇 |
1997年 | 26篇 |
1996年 | 27篇 |
1995年 | 21篇 |
1994年 | 22篇 |
1993年 | 24篇 |
1992年 | 8篇 |
1991年 | 8篇 |
1990年 | 11篇 |
1989年 | 33篇 |
1988年 | 18篇 |
1987年 | 25篇 |
1986年 | 21篇 |
1985年 | 30篇 |
1984年 | 15篇 |
1983年 | 11篇 |
1982年 | 6篇 |
1981年 | 8篇 |
1980年 | 11篇 |
1979年 | 5篇 |
1978年 | 3篇 |
1977年 | 14篇 |
1976年 | 7篇 |
1975年 | 2篇 |
1974年 | 2篇 |
排序方式: 共有518条查询结果,搜索用时 31 毫秒
1.
2.
V Allen PhD DW Ryan MB FRCA A Murray PhD FIPSM 《International journal of clinical practice》1994,48(3):125-129
SUMMARY Four specialised air mattresses had interface pressure measured under six body sites prone to pressure sores in 10 subjects, supine and sitting. The mattresses were the Clinirest (SSI) and FirstStep (KCI) continuous airflow mattress overlays, and Airwave (Pegasus) and Nimbus (Huntleigh) alternating pressure air mattresses. On the mattress overlays, average supine interface pressures were 2.33 kPa (scapula), 4.15 kPa (elbow), 1.94 kPa (sacrum) and 2.79 kPa (buttock), although they were higher at the occiput (7.97 kPa) and heel (11.7 kPa). The alternating pressure air mattresses had an average minimum interface pressure close to zero for three sites, rising to 4.28 kPa under the heel. Average maximum interface pressures were 8.61 kPa (occiput), 5.21 kPa (scapula), 4.90 (elbow), 4.85 kPa (sacrum), 4.61 kPa (buttock) and 13.2 kPa (heel). No accepted scientific method exists for comparing the two types of mattress. Our data suggest a clinical benefit at the occiput and heel (supine) in using an alternating pressure air mattress and a benefit in using a continuous airflow mattress overlay at other sites. 相似文献
3.
4.
The rate of glucose consumption in cultured epithelium, endothelium, and keratocytes was measured; and the effect of reduced glucose availability on the consumption rate of these three cell lines was delineated. All three cell types exhibited an asymptotic decrease of glucose over time while being incubated in Krebs-Ringers solutions of varying glucose concentrations. At a concentration resembling that of the aqueous, epithelium (EPI), endothelium (ENDO), and keratocytes (K) consumed 6.7, 7.4, and 9.0 micrograms/cm2/hr respectively. Each cell type consumed glucose at a rate that was related to the amount of available glucose. As glucose concentration was reduced from 90 to 30 mg%, which was a 66% reduction in available glucose, the consumption of EPI, ENDO, and K dropped 74%, 61%, and 44% respectively. 相似文献
5.
Eleven radiologists appointed by the major radiological societies participated for the past 5 years in the development of the Health Policy Agenda for the American People. The Agenda is an action plan to address a wide variety of serious problems in medicine. The first phase involved establishment of 159 principles, broad value statements that were the foundation of the project. Phase 2 involved the development of policy proposals on 38 urgent issues for action in medical science; education; health resources; delivery mechanisms; evaluation, assessment, and control; and payment for services. These proposals are summarized in this report. The activities and recommendations of representatives for the field of radiology are described. The Agenda has been released, and an implementation phase has begun. It will likely be of great importance to the practice of radiology over the next decade. Important issues can be addressed by acting with the coalitions that are being formed from among the more than 150 participating organizations. 相似文献
6.
7.
8.
9.
10.