全文获取类型
收费全文 | 2528篇 |
免费 | 174篇 |
国内免费 | 28篇 |
专业分类
耳鼻咽喉 | 18篇 |
儿科学 | 99篇 |
妇产科学 | 73篇 |
基础医学 | 275篇 |
口腔科学 | 91篇 |
临床医学 | 272篇 |
内科学 | 637篇 |
皮肤病学 | 36篇 |
神经病学 | 148篇 |
特种医学 | 323篇 |
外国民族医学 | 3篇 |
外科学 | 275篇 |
综合类 | 36篇 |
一般理论 | 1篇 |
预防医学 | 179篇 |
眼科学 | 30篇 |
药学 | 153篇 |
肿瘤学 | 81篇 |
出版年
2022年 | 19篇 |
2021年 | 29篇 |
2020年 | 10篇 |
2019年 | 34篇 |
2018年 | 50篇 |
2017年 | 23篇 |
2016年 | 30篇 |
2015年 | 45篇 |
2014年 | 57篇 |
2013年 | 80篇 |
2012年 | 127篇 |
2011年 | 104篇 |
2010年 | 78篇 |
2009年 | 75篇 |
2008年 | 88篇 |
2007年 | 118篇 |
2006年 | 115篇 |
2005年 | 96篇 |
2004年 | 68篇 |
2003年 | 79篇 |
2002年 | 67篇 |
2001年 | 63篇 |
2000年 | 51篇 |
1999年 | 72篇 |
1998年 | 82篇 |
1997年 | 89篇 |
1996年 | 95篇 |
1995年 | 56篇 |
1994年 | 50篇 |
1993年 | 55篇 |
1992年 | 44篇 |
1991年 | 47篇 |
1990年 | 46篇 |
1989年 | 75篇 |
1988年 | 68篇 |
1987年 | 50篇 |
1986年 | 56篇 |
1985年 | 46篇 |
1984年 | 22篇 |
1983年 | 22篇 |
1982年 | 19篇 |
1981年 | 19篇 |
1980年 | 20篇 |
1978年 | 13篇 |
1977年 | 23篇 |
1976年 | 19篇 |
1975年 | 14篇 |
1974年 | 10篇 |
1973年 | 15篇 |
1972年 | 11篇 |
排序方式: 共有2730条查询结果,搜索用时 15 毫秒
11.
目的 探索LDH实验检测细胞活力的可行性。方法 原代培养骨髓细胞和软骨细胞,用LDH实验测定上述两组细胞的活力,并与镜下活体观察到细胞的生长状况相比较。与目前比较成熟的测定细胞活力的MTS实验的测得的值相比较。结果 LDH实验对上述两组细胞的活力的测定结果与镜下活体观察到的结果相符合。与MTS实验的测得的结果经统计学处理无显著差异。结论 LDH实验可用于细胞活力的直接测定,而对活细胞的生存、繁殖无影响。 相似文献
12.
13.
A.K. Pringle F. Iannotti G.J.C. Wilde J.E. Chad P.J. Seeley L.E. Sundstrom 《Brain research》1997,755(1):36-46
We have investigated the relative contributions of oxygen and glucose deprivation to ischaemic neurodegeneration in organotypic hippocampal slice cultures. Cultures prepared from 10-day-old rats were maintained in vitro for 14 days and then deprived of either oxygen (hypoxia), glucose (hypoglycaemia), or both oxygen and glucose (ischaemia). Hypoxia alone induced degeneration selectively in CA1 pyramidal cells and this was greatly potentiated if glucose was removed from the medium. We have also characterised the effects of both pre-and post-treatment using glutamate receptor antagonists and the sodium channel blocker tetrodotoxin (TTX). Neuronal death following either hypoxia or ischaemia was prevented by pre-incubation with CNQX, MK-801 or tetrodotoxin. MK-801 or CNQX also prevented death induced by either hypoxia or ischaemia if added immediately post-insult, however, post-insult addition of TTX prevented hypoxic but not ischaemic damage. Organotypic hippocampal slice cultures are sensitive to both NMDA and non-NMDA glutamate receptor blockade and thus represent a useful in vitro system for the study of ischaemic neurodegeneration paralleling results reported using in vivo models of ischaemia. 相似文献
14.
A comprehensive anatomic and radiographic analysis of the peribursal fat plane in 12 cadavers confirmed that the fat plane seen on radiographs represents extrasynovial fat lining the subacromial bursa and documented the anatomic relations of the bursa. A three-part retrospective clinical evaluation of rotator cuff tears, calcific tendinitis, and rheumatoid arthritis was performed. Two osteoradiologists blindly graded the appearance of the peribursal fat plane with the shoulder in external versus internal rotation in 21 patients with arthrographically intact rotator cuffs and 21 patients with disrupted rotator cuffs. The peribursal fat plane was seen better with disrupted rotator cuffs. The peribursal fat plane was seen better with the shoulder in internal rotation and was seen in 60% of control subjects but only 21% of patients with rotator cuff tears. Partial or complete obliteration of this fat plane is a sensitive (79%) but less specific (60%) indicator of rotator cuff tears. Obliteration of the peribursal fat plane by inflammatory processes in adjacent tissues, including calcific tendinitis and rheumatoid arthritis, occurred with a high frequency. 相似文献
15.
16.
17.
Marie Louise Hall-Lord PhD RNT Bodil Wilde Larsson PhD RNT Carina Bth MsC RN Inger Johansson PhD RNT 《Journal of Orthopaedic Nursing》2004,8(4):76
The aims were to investigate: (1) experiences of physical pain in elderly patients with hip fracture; (2) if background variables, confusion, experiences of pain and distress and interventions aimed at reducing pain and distress, functional ability, pain in the ambulance, and type of fracture varied between patients with more intense physical pain and patients with less intense physical pain. The sample included 49 patients, 70 years or older, with hip fracture. Structured instruments were used to interview and observe the patients on four occasions during the hospital stay. The patients’ experiences of physical pain decreased during the hospital stay. Physical pain at rest was lower than pain with movement. Patients who scored physical pain as more intense (group B) during the visit to the hospital had significantly more unfavourable experiences in the sensory, emotional, and existential dimensions the day before discharge from the hospital compared with the patients who scored pain as less intense (group A). The patients in group B perceived the interventions as less favourable than group A. Furthermore, group B had more intense physical pain in the ambulance than the patients in the other group. More patients in group B than in group A had additional health problems. 相似文献
18.
Oscillatory motion of the normal cervical spinal cord 总被引:2,自引:0,他引:2
19.
Periosteal Ewing sarcoma 总被引:3,自引:0,他引:3
20.