全文获取类型
收费全文 | 341877篇 |
免费 | 282189篇 |
国内免费 | 37487篇 |
专业分类
耳鼻咽喉 | 3186篇 |
儿科学 | 8430篇 |
妇产科学 | 5986篇 |
基础医学 | 98986篇 |
口腔科学 | 3473篇 |
临床医学 | 65939篇 |
内科学 | 111026篇 |
皮肤病学 | 6176篇 |
神经病学 | 28034篇 |
特种医学 | 14742篇 |
外国民族医学 | 12篇 |
外科学 | 53734篇 |
综合类 | 58505篇 |
现状与发展 | 1篇 |
一般理论 | 24篇 |
预防医学 | 51006篇 |
眼科学 | 21084篇 |
药学 | 63302篇 |
4篇 | |
中国医学 | 48020篇 |
肿瘤学 | 19883篇 |
出版年
2020年 | 6317篇 |
2019年 | 13273篇 |
2018年 | 17695篇 |
2017年 | 18932篇 |
2016年 | 15933篇 |
2015年 | 14590篇 |
2014年 | 14195篇 |
2013年 | 14179篇 |
2012年 | 18250篇 |
2011年 | 19877篇 |
2010年 | 18748篇 |
2009年 | 25982篇 |
2008年 | 15074篇 |
2007年 | 11276篇 |
2006年 | 10589篇 |
2005年 | 20192篇 |
2004年 | 28006篇 |
2003年 | 22171篇 |
2002年 | 13790篇 |
2001年 | 14247篇 |
2000年 | 8345篇 |
1999年 | 13779篇 |
1998年 | 14991篇 |
1997年 | 14746篇 |
1996年 | 15476篇 |
1995年 | 15475篇 |
1994年 | 15318篇 |
1993年 | 14243篇 |
1992年 | 13366篇 |
1991年 | 12651篇 |
1990年 | 11577篇 |
1989年 | 11310篇 |
1988年 | 10786篇 |
1987年 | 10133篇 |
1986年 | 9612篇 |
1985年 | 8617篇 |
1984年 | 6643篇 |
1983年 | 6633篇 |
1982年 | 7667篇 |
1981年 | 7222篇 |
1980年 | 6873篇 |
1979年 | 6706篇 |
1978年 | 5868篇 |
1977年 | 6165篇 |
1976年 | 5779篇 |
1975年 | 5534篇 |
1974年 | 5078篇 |
1973年 | 4799篇 |
1972年 | 4791篇 |
1971年 | 4115篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
181.
182.
足部骨筋膜室综合征早期诊断与治疗 总被引:2,自引:0,他引:2
目的:探讨足部骨筋膜室综合征早期诊断与治疗结果。方法:1998年1月-2003年12月收治15例足骨筋膜室综合征患者(均为男性:年龄15~55岁,平均32岁),行足背双切口减压4例,足底内侧减压9例,足内外两侧减压2例。1周后行减张缝合或植皮术。结果:15例随访9~24个月,12例恢复佳,足运动感觉正常;2例有足底感觉减退、足趾麻木;1例遗留前足挛缩、无力,足趾麻木。无爪形趾及功能障碍者。结论:足损伤后,Whiteside法测定组织间隙压力是诊断足骨筋膜室综合征的可靠方法。治疗时足部如有骨折、血肿者,骨筋膜室减张切口,宜选择足底内侧切开效果较好。 相似文献
183.
184.
Three-dimensional diffusion tensor tract (DTT) is the newest imaging to describe the structure of white matter fiber in three-dimensions, it has great significance in dividing the concrete anatomic site of gray and white matter lesions, displaying the correlation with fibrous band and judging clinical prognosis, which is incomparable by other imagings.OBJECTTVE: To observe the conditions of corticospinal tract (CST) in acute cerebral ischemic stroke patients,and analyze the relationship between motor function and the severity of CST injury.DESIGN: A case-control observation.SETTTNG: Department of Medical Imaging, Fuzhou General Hospital of Nanjing Military Area Command of Chinese PLA.PARTTCTPANTS: Fifteen patients with acute cerebral infarction were selected from Fuzhou General Hospital of Nanjing Military Area Command of Chinese PLA from February to December in 2005. They all suffered from acute attack and motor disorder of hemiplegic limbs to different extent, and were conformed by CT or MRI.There were 9 males and 6 females, aging 16-87 years old, the median age was 51.7 years, and all were right handed. Fifteen right-handed normal subjects, who were matched by age and sex with the patients in the cerebral infarction group, were selected from the relatives of patients and physicians of the Imaging Department as the control group. All the subjects were informed and agreed with the study.METHODS: The patients with acute cerebral infarction and subjects in the control group received MR diffusion tensor imaging (DTI) with GE 1.5 T nuclear magnetic resonance system, fiber tracking with the software of dTV- Ⅱ. Fractional anisotropy (FA) maps and three-dimensional tractography of bilateral CST of all patients were created. Displacement, continuity and destroy of fibrous bands were observed. At the same time, muscle strength of ipsilateral hand of patients with cerebral infarction was measured with Brunnstrom standard. The correlation between the severity of CST injury and the muscle strength of ipsilateral hand was analyzed with spearman correlation analysis.MAIN OUTCOME MEASURES: ① FA values in the infarcted sites and those in the contralateral corresponding sites of patients with cerebral infarction; ② CST manifestations in the patients with cerebral infarction and the control group.RESULTS: All the 30 testees were involved in the analysis of results. ① The FA values in infarcted sites of white matter were significantly lower than those in the contralateral ones (t =4.570, P < 0.001 ). ② In the control group, bilateral CST were reconstructed, they originated from precentral gyrus, went downwards to internal capsule, and extended to pontine and medulla oblongata, each fiber had good uniformity in continuous form. In the patients with cerebral infarction, the forms of contralateral CST were consistent with those in the control group with good continuity. Due to the involvement by the infarcted site to different extents, the ipsilateral CST manifested as continuous interruption and loss of uniformity in anatomic structure and form. The CST involvements were divided into three grades: integrated CST for grade I (n =2); integrated CST but compressed or displaced for grade 2 (n =5); interrupted CST for grade 3 (n =8). ③ The severity of CST injury was obviously correlated with the muscle strength of the ipsilateral hand (r=0.888, P< 0.05=.CONCLUSION: ① CST is injured to different extents in patients with acute cerebral infarction, and the severity of injury is associated with muscle strength. It is indicated that it can be used to judge the prognosis of rehabilitative treatment. ②DTT can directly display the status of pyramidal tract more three-dimensionally. 相似文献
185.
186.
Jean-Sébastien Fallu Jürgen Rehm Emmanuel N. Kuntsche Esther Grichting Neerav Monga Edward M. Adlaf Susan J Bondy Gerhard Gmel 《Sozial- und Pr?ventivmedizin》2006,8(1):363-372
Volume and profile of alcohol consumption among students and classmates as predictors of aggression and victimization: a multilevel
analysis among Swiss adolescents
Objective:
To test the effects of the volume of alcohol consumption and drinking patterns on alcohol-related aggression and victimization, both at the individual and class levels. 相似文献187.
188.
189.
190.
Tetsuro Sano Munetaka Masuda Shigeki Morita Hisataka Yasui 《The Japanese Journal of Thoracic and Cardiovascular Surgery》2006,54(4):149-154
OBJECTIVE: It is well documented that cardiopulmonary bypass (CPB) severely impairs cellular immunity. The objective of this study was to investigate the effect of prostaglandin E1 (PGE1) on cellular immunity after CPB. METHODS: Patients who underwent elective cardiac surgery were randomly divided into the PGE1 group (n=12) and the control group (n=12). In the PGE1 group, PGE1 was administered at 20 ng/kg/min from just after the induction of anesthesia to the end of surgery. Peripheral blood mononuclear cells (PBMCs) were taken before anesthesia and on postoperative days 1, 3 and 7 (POD 1, POD 3 and POD 7). Proliferation responses of T cells to phytohemagglutinin (PHA) and pure protein derivative (PPD) antigen were measured as indicators of cellular immunity. RESULTS: PGE1 significantly attenuated the impairment of both PHA and PPD response after cardiac surgery on POD 1 (PHA response, 30 +/- 21% vs. 53 +/- 32%, control vs. PGE, p=0.048; PPD response, 18 +/- 21% vs. 39 +/- 27%, control vs. PGE, p=0.046). The reduced glutathione content of PBMCs in the control group was significantly decreased on POD 1. CONCLUSION: PGE1 attenuated the impairment of cellular immunity after cardiac surgery with CPB by reducing oxidative stress on PBMCs. 相似文献