全文获取类型
收费全文 | 17755篇 |
免费 | 1308篇 |
国内免费 | 728篇 |
专业分类
耳鼻咽喉 | 53篇 |
儿科学 | 59篇 |
妇产科学 | 39篇 |
基础医学 | 1510篇 |
口腔科学 | 330篇 |
临床医学 | 1445篇 |
内科学 | 518篇 |
皮肤病学 | 34篇 |
神经病学 | 2172篇 |
特种医学 | 840篇 |
外国民族医学 | 2篇 |
外科学 | 4080篇 |
综合类 | 2624篇 |
现状与发展 | 1篇 |
预防医学 | 350篇 |
眼科学 | 3196篇 |
药学 | 801篇 |
13篇 | |
中国医学 | 1602篇 |
肿瘤学 | 122篇 |
出版年
2024年 | 67篇 |
2023年 | 298篇 |
2022年 | 512篇 |
2021年 | 678篇 |
2020年 | 660篇 |
2019年 | 454篇 |
2018年 | 524篇 |
2017年 | 567篇 |
2016年 | 634篇 |
2015年 | 609篇 |
2014年 | 1270篇 |
2013年 | 1343篇 |
2012年 | 1107篇 |
2011年 | 1164篇 |
2010年 | 1001篇 |
2009年 | 824篇 |
2008年 | 872篇 |
2007年 | 872篇 |
2006年 | 731篇 |
2005年 | 613篇 |
2004年 | 547篇 |
2003年 | 553篇 |
2002年 | 465篇 |
2001年 | 373篇 |
2000年 | 320篇 |
1999年 | 285篇 |
1998年 | 261篇 |
1997年 | 240篇 |
1996年 | 209篇 |
1995年 | 169篇 |
1994年 | 157篇 |
1993年 | 148篇 |
1992年 | 123篇 |
1991年 | 114篇 |
1990年 | 87篇 |
1989年 | 89篇 |
1988年 | 74篇 |
1987年 | 73篇 |
1986年 | 82篇 |
1985年 | 111篇 |
1984年 | 91篇 |
1983年 | 67篇 |
1982年 | 84篇 |
1981年 | 68篇 |
1980年 | 50篇 |
1979年 | 37篇 |
1978年 | 35篇 |
1977年 | 30篇 |
1976年 | 14篇 |
1975年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
B超诊断腰椎间盘突出症的临床价值(附64例分析) 总被引:1,自引:0,他引:1
报告经CT检查和临床治疗证实的64倒腰椎间盘突出症的B超检查结果,B超检出70个突出之椎间盘,CT检出73个,阳性率之比为70/73。70个突出椎间盘中,中央型5个,偏中央型20个,后外侧型44个,极外侧型1个;轻度30个,中度28个,重度12个。分型分度与临床表现及治疗选择有密切关系。B超检查与CT相此较,具有近似的诊断价值,但经济、实用,操作简单方便,值得推广。 相似文献
22.
采用经皮弧式椎间盘切除器械治疗L_5~S_1椎间盘突出症22例,21例成功。术后优良率为86.4%。该器械能够避开髂嵴阻挡进入L_5~S_1椎间隙,并增加椎间盘切除量,提高经皮L_5~S_1椎间盘切除成功率。定位正确是成功的关键。 相似文献
23.
David G. Wilder 《American journal of industrial medicine》1993,23(4):577-588
This work is a review of the mechanical factors related to low back pain production in a vibration environment. The sitting posture is an extreme orientation for the lumbar intervertebral disc that 1) increases its internal pressure, 2) increases its anteroposterior shear flexibility, while: 3) decreasing its resistance to buckling instability and 4) stressing the posterior region of the disc. Vibration is an additional mechanical stressor. Several studies suggest that the following preventive measures be taken to reduce the risk of low back pain due to driving: 1) minimize the vibration reaching the driver, 2) avoid lifting or bending immediately following driving, and 3) walk around for a few minutes following driving. © 1993 Wiley-Liss, Inc. 相似文献
24.
25.
Linkage studies and mutation analysis of the PDEB gene in 23 families with Leber congenital amaurosis. 总被引:1,自引:0,他引:1
The phenotype in the rd mouse is similar to the clinical presentation of Leber congenital amaurosis (LCA) in humans. Recently a nonsense mutation in the beta subunit of the cGMP phosphodiesterase (Pdeb) gene has been defined as the cause for the rd phenotype in the mouse and has raised the question as to whether mutations in the human PDEB gene might cause LCA. We have previously cloned and characterized the human homologue of the mouse Pdeb gene and have mapped it to chromosome 4p16.3. In this study, a total of 23 LCA families of various ethnic backgrounds have been investigated. Linkage analysis using highly polymorphic (CA)n microsatellites has excluded the PDEB gene as a cause for LCA in 6 families. In the remaining 17 families, we have searched for mutations in the 22 exons of the PDEB gene using single-strand gel electrophoresis (SSGE). Multiple exonic polymorphisms have been determined. However, no DNA changes in the PDEB gene have been identified in our study population which could be causative for the LCA phenotype. 相似文献
26.
MRI of the brain in chronic carbon monoxide poisoning 总被引:3,自引:0,他引:3
We examined 13 patients with chronic carbon monoxide (CO) poisoning by magnetic resonance imaging (MRI); all of them had been in an explosion in a coal mine 25 years previously. Symmetrical globus pallidus lesions were observed in 12, as was degeneration of the white matter, with focal cortical atrophy. The temporal parietal and occipital lobes were usually affected, the parietooccipital region being the most frequently and extensively damaged. Of the 12 patients with white matter degeneration 7 had definitely asymmetrical cortical and subcortical lesions. There were 6 patients with dilated temporal horns, probably due to atrophy of the hippocampal gyri. A history of CO inhalation and an awareness of the typical distributions of lesions are important for recognition of the effects of CO poisoning, especially when patients are in the chronic stage. 相似文献
27.
报告手术治疗腰椎间盘突出症合并退行性腰椎管狭窄症104例。术后随访90例,随诊时6个月~6年。优良率86.5%,无腰椎不稳和腰椎滑脱等并发症。为获得优良效果,作者强调在处理椎间盘突出的同时必须彻底解除侧隐窝及神经根管,黄韧带肥厚对神经根的压迫,才能彻底根除症状 相似文献
28.
Ping Zhao 《中国结合医学杂志》1995,1(3):197-200
AStudyonExtension-FlexionDynamicLumbarSpineRadiographsinPatientswithLumbarIntervertebralDiscHerniationAStudyonExtension-Flexi... 相似文献
29.
30.
T. Saito 《European journal of pediatrics》1987,146(3):261-265
The presenting symptoms of Wilson disease and its natural history as related to age are described based on 283 cases collected in Japan. The disease presented with a variety of signs and symptoms; the most frequent were in order of frequency jaundice, dysarthria, clumsiness, tremor, drooling, gait disturbance, malaise and arthralgia. The mean age at onset of the disease was 12.0 years. Hepatic and osteoarthral symptoms developed early and neurological symptoms late. Fifty-eight cases develolped neurological symptoms only, 28 cases had hepatic symptoms only, and in 26 cases hepatic mortality rate was observed in hepatic, hepato-haematological and hepato-renal cases mainly due to acute hepatic failure resulting in death only a few weeks after onset. Cases having only neurological symptoms showed a more favourable prognosis with a longer survival. 相似文献