全文获取类型
收费全文 | 573篇 |
免费 | 30篇 |
国内免费 | 15篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 22篇 |
妇产科学 | 5篇 |
基础医学 | 44篇 |
口腔科学 | 8篇 |
临床医学 | 50篇 |
内科学 | 134篇 |
皮肤病学 | 10篇 |
神经病学 | 21篇 |
特种医学 | 139篇 |
外科学 | 30篇 |
综合类 | 33篇 |
预防医学 | 16篇 |
眼科学 | 12篇 |
药学 | 32篇 |
中国医学 | 1篇 |
肿瘤学 | 59篇 |
出版年
2023年 | 1篇 |
2022年 | 4篇 |
2021年 | 3篇 |
2020年 | 5篇 |
2019年 | 7篇 |
2018年 | 7篇 |
2017年 | 7篇 |
2016年 | 3篇 |
2015年 | 6篇 |
2014年 | 9篇 |
2013年 | 11篇 |
2012年 | 7篇 |
2011年 | 10篇 |
2010年 | 14篇 |
2009年 | 18篇 |
2008年 | 13篇 |
2007年 | 13篇 |
2006年 | 18篇 |
2005年 | 20篇 |
2004年 | 12篇 |
2003年 | 17篇 |
2002年 | 18篇 |
2001年 | 21篇 |
2000年 | 14篇 |
1999年 | 15篇 |
1998年 | 26篇 |
1997年 | 39篇 |
1996年 | 26篇 |
1995年 | 23篇 |
1994年 | 24篇 |
1993年 | 18篇 |
1992年 | 11篇 |
1991年 | 17篇 |
1990年 | 9篇 |
1989年 | 26篇 |
1988年 | 18篇 |
1987年 | 19篇 |
1986年 | 10篇 |
1985年 | 15篇 |
1984年 | 8篇 |
1983年 | 13篇 |
1982年 | 10篇 |
1981年 | 11篇 |
1980年 | 6篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 4篇 |
1976年 | 3篇 |
1975年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有618条查询结果,搜索用时 15 毫秒
101.
102.
Complications of spinal cord arteriography: prospective assessment of risk for diagnostic procedures
Forbes G; Nichols DA; Jack CR Jr; Ilstrup DM; Kispert DB; Piepgras DG; Wiebers DO; Earnest F th; Axley PL 《Radiology》1988,169(2):479-484
A prospective study was done of complications associated with 134 consecutive diagnostic spinal cord arteriograms in 96 patients (63 men and 33 women aged 17-78 years). Patients were examined for either arteriovenous malformation (n = 88) or tumor (n = 8), as indicated by myelography. Among the complications, 11 (8.2%) were local, five (3.7%) were systemic nonneurologic, and three (2.2%) were neurologic (two were associated with full recovery in less than 24 hours, and one was associated with full recovery in less than 1 week). No specific clinical or technical factors were significantly associated with the development of neurologic complications. Details of the clinical profile, angiographic technique, and pathologic findings for each patient were recorded and analyzed with respect to the potential risk for arteriographic complications. Diagnostic spinal cord arteriography had an acceptable risk within the range of other neuroangiographic diagnostic procedures. 相似文献
103.
104.
105.
Pneumothorax: appearance on lateral chest radiographs 总被引:1,自引:0,他引:1
The appearance of pneumothorax on lateral radiographs obtained with the patient erect were reviewed in 100 patients (122 total examinations). A pneumothorax could be seen on the lateral projection in 89% of the examinations (109 of 122). The displaced pleural line was most frequently identified anteriorly or posteriorly and was less commonly identified at the lung apex or in a subpulmonic location. In 11 cases, an air-fluid level was the only recognizable finding of a pneumothorax on the lateral projection. Although in 27% of examinations (32 of 122) the pneumothorax was either not seen (11%) (n = 13) or was a subtle finding (16%) (n = 19), in 14% of examinations (17 of 122) the lateral projection provided helpful information to supplement the posteroanterior projection. 相似文献
106.
The role of the endoplasmic reticulum Ca2+ store in the plasticity of central neurons 总被引:7,自引:0,他引:7
The smooth endoplasmic reticulum (SER) is a well-characterized buffer and source of Ca2+ in both axonal and dendritic compartments of neurons. Ca2+ release from the SER can be evoked by stimulation of the ryanodine receptor or the inositol (1,4,5)-trisphosphate [Ins(1,4,5)P3] receptor. Both receptors can couple to the activation of neurotransmitter-gated receptors and voltage-gated Ca2+ channels on the plasma membrane, thus enabling the SER to discriminate between different types of neuronal activity. In axonal terminals, Ca2+-induced Ca2+ release (CICR) mediates spontaneous, evoked and facilitated neurotransmission. Store release might also regulate the mobilization and recycling of synaptic vesicles. In the dendritic compartment, the distribution of Ins(1,4,5)P3 receptors and ryanodine receptors influences the intracellular encoding of neuronal activity. Thus, the functionality of the Ca2+ store can affect both the polarity and the spatial extent of Ca2+-dependent shifts in synaptic efficacy. In hippocampal neurons, for example, CICR in the spine heads underlies homosynaptic plasticity, whereas heterosynaptic plasticity is mediated by Ins(1,4,5)P3-dependent Ca2+ signalling. Purkinje neurons primarily express Ins(1,4,5)P3 receptors in the spine heads, and long-term depression of synaptic efficacy is crucially dependent on Ins(1,4,5)P3. 相似文献
107.
108.
109.
110.