全文获取类型
收费全文 | 616篇 |
免费 | 35篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 25篇 |
基础医学 | 52篇 |
口腔科学 | 13篇 |
临床医学 | 57篇 |
内科学 | 163篇 |
皮肤病学 | 4篇 |
神经病学 | 27篇 |
特种医学 | 166篇 |
外科学 | 37篇 |
综合类 | 22篇 |
预防医学 | 27篇 |
眼科学 | 16篇 |
药学 | 31篇 |
2篇 | |
肿瘤学 | 26篇 |
出版年
2022年 | 2篇 |
2021年 | 7篇 |
2019年 | 5篇 |
2018年 | 5篇 |
2017年 | 3篇 |
2016年 | 2篇 |
2015年 | 6篇 |
2014年 | 5篇 |
2013年 | 6篇 |
2012年 | 16篇 |
2011年 | 16篇 |
2010年 | 11篇 |
2009年 | 17篇 |
2008年 | 15篇 |
2007年 | 24篇 |
2006年 | 13篇 |
2005年 | 14篇 |
2004年 | 14篇 |
2003年 | 7篇 |
2002年 | 9篇 |
2001年 | 7篇 |
2000年 | 17篇 |
1999年 | 18篇 |
1998年 | 28篇 |
1997年 | 31篇 |
1996年 | 31篇 |
1995年 | 23篇 |
1994年 | 23篇 |
1993年 | 25篇 |
1992年 | 8篇 |
1991年 | 14篇 |
1990年 | 13篇 |
1989年 | 37篇 |
1988年 | 18篇 |
1987年 | 29篇 |
1986年 | 17篇 |
1985年 | 31篇 |
1984年 | 17篇 |
1983年 | 11篇 |
1982年 | 7篇 |
1981年 | 10篇 |
1980年 | 14篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 13篇 |
1976年 | 7篇 |
1974年 | 4篇 |
1972年 | 4篇 |
1970年 | 2篇 |
1941年 | 2篇 |
排序方式: 共有670条查询结果,搜索用时 15 毫秒
1.
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
2.
3.
The Johns Hopkins Wilmer Eye Institute and the NASA Stennis Space Center are collaborating on the development of a new high technology low vision aid called the Low Vision Enhancement System (LVES). The LVES consists of a binocular head-mounted video display system, video cameras mounted on the head-mounted display, and real-time video image processing in a system package that is battery powered and portable. Through a phased development approach, several generations of the LVES can be made available to the patient in a timely fashion. This paper describes the LVES project with major emphasis on technical problems encountered or anticipated during the development process. 相似文献
4.
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
5.
6.
7.
8.
9.
Microarray based comparative genomic hybridisation (array-CGH) detects submicroscopic chromosomal deletions and duplications in patients with learning disability/mental retardation and dysmorphic features 总被引:24,自引:2,他引:24
下载免费PDF全文
![点击此处可从《Journal of medical genetics》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Shaw-Smith C Redon R Rickman L Rio M Willatt L Fiegler H Firth H Sanlaville D Winter R Colleaux L Bobrow M Carter NP 《Journal of medical genetics》2004,41(4):241-248
The underlying causes of learning disability and dysmorphic features in many patients remain unidentified despite extensive investigation. Routine karyotype analysis is not sensitive enough to detect subtle chromosome rearrangements (less than 5 Mb). The presence of subtle DNA copy number changes was investigated by array-CGH in 50 patients with learning disability and dysmorphism, employing a DNA microarray constructed from large insert clones spaced at approximately 1 Mb intervals across the genome. Twelve copy number abnormalities were identified in 12 patients (24% of the total): seven deletions (six apparently de novo and one inherited from a phenotypically normal parent) and five duplications (one de novo and four inherited from phenotypically normal parents). Altered segments ranged in size from those involving a single clone to regions as large as 14 Mb. No recurrent deletion or duplication was identified within this cohort of patients. On the basis of these results, we anticipate that array-CGH will become a routine method of genome-wide screening for imbalanced rearrangements in children with learning disability. 相似文献
10.