首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   384篇
  免费   15篇
  国内免费   69篇
耳鼻咽喉   4篇
儿科学   9篇
妇产科学   5篇
基础医学   30篇
口腔科学   7篇
临床医学   73篇
内科学   66篇
皮肤病学   8篇
神经病学   11篇
特种医学   55篇
外科学   64篇
综合类   27篇
预防医学   14篇
眼科学   7篇
药学   69篇
中国医学   1篇
肿瘤学   18篇
  2023年   4篇
  2022年   5篇
  2021年   12篇
  2020年   8篇
  2019年   8篇
  2018年   12篇
  2017年   8篇
  2016年   5篇
  2015年   10篇
  2014年   11篇
  2013年   18篇
  2012年   8篇
  2011年   13篇
  2010年   13篇
  2009年   10篇
  2008年   19篇
  2007年   50篇
  2006年   11篇
  2005年   18篇
  2004年   6篇
  2003年   8篇
  2002年   8篇
  2001年   9篇
  2000年   10篇
  1999年   11篇
  1998年   18篇
  1997年   18篇
  1996年   18篇
  1995年   15篇
  1994年   4篇
  1993年   6篇
  1992年   4篇
  1991年   6篇
  1990年   6篇
  1989年   17篇
  1988年   12篇
  1987年   6篇
  1986年   5篇
  1985年   2篇
  1984年   3篇
  1980年   3篇
  1978年   3篇
  1977年   5篇
  1976年   2篇
  1972年   1篇
  1971年   5篇
  1970年   3篇
  1969年   3篇
  1968年   1篇
  1967年   3篇
排序方式: 共有468条查询结果,搜索用时 15 毫秒
91.

Objective

The aim of this study was to assess the accuracy of ultrasound elastography as a recent imaging technique in diagnosis of CTS and evaluation of its severity in patients suffering clinically compared to the results of the gold standard electrophysiological tests.

Materials and methods

This was a prospective cross sectional study included 100 patients clinically diagnosed as having unilateral idiopathic CTS (90% of the dominant hand), referred to radiology department from physical medicine department at Alexandria main university hospital from June 2015 till May 2016 after being evaluated electrophysiologically for correlation with the data of the ultrasound and ultrasound elastography of the median nerve. A control group of 100 patients with no wrist or hand complain were included in the study.

Results

As diagnosed electrophysiologically, there were 44 (44%), 35 (35%) and 21 (21%) patients with mild, moderate and severe degree of CTS respectively. The mean cross sectional area of the median nerve among the studied cases was 12.19?±?1.59?mm2 while the mean strain ratio of the median nerve by ultrasound elastography was 2.20 (1.0–5.0).

Conclusion

In addition to electrophysiological study, ultrasound and ultrasound elastography are valuable tools for the diagnosis and classification of CTS.  相似文献   
92.

Background

This study compares the differences in acetabular component position, leg length discrepancy, and hip offset between the anterior and posterior approach. A novel method is applied to determine the acetabular anteversion using the C-arm tilt angle for the anterior approach.

Methods

Hundred consecutive anterior total hip arthroplasties were matched according to gender, body mass index, and age to a cohort of 100 primary total hip arthroplasties operated on through a posterior approach. Postoperative radiographs were analyzed to determine cup inclination, cup anteversion, leg length discrepancy, and hip offset.

Results

The mean inclination was 40.8° (range 33°-48°) and 45.1° (range 33°-55°) for the anterior and posterior approach, respectively. Using the new C-arm tilt plane technique, an average acetabular anteversion of 18.4° (range 11°-26°) was achieved with the anterior approach compared with 23.6° (range 8°-38°) with the posterior approach. Hundred percent cups in the anterior group and 81% in the posterior group fell within the safe zone (P < .001). There was no difference in the overall hip offset between the operated side and the contralateral side for the anterior (P = .074) and posterior (P = .919) group. There was no difference in leg length discrepancy between the 2 approaches (P = .259).

Conclusion

Intraoperative fluoroscopy-assisted direct anterior approach was associated with improved acetabular component positioning. However, no benefit was shown with regards to restoration of hip offset or leg length.  相似文献   
93.
94.
杜仲新炮制工艺参数优选   总被引:8,自引:0,他引:8  
目的;采用正交试验法对盐杜仲的炮制工艺进行优选试验。方法;选择微波强度和加热时间2个因素,每个因素各取3个水平,按L9(3)4正文表安排试验,用2个指标评定工艺的优劣。结果:采用微波高火,加热15min为最佳工艺条件。结论:微波加热炮制盐杜仲的工艺是可行的。  相似文献   
95.
标  题 瑞典老年高血压试验中的发病率及病死率作  者 DahlofB,LindholmLH,HanssonL,etal.  参考文献 Lancet,1991,338:1281~1285研究的疾病 高血压病。目  的 是为了评估抗高血压药物治疗对70~84岁老年高血压患者的益处岁的高血压患者,基础血压≥180/90mmHg,或舒张压≥105mmHg。进入试验前12个月内有心肌梗死、脑卒中、体位性低血压及血压>230/120mmHg者已除外。随  访 随访1~4年,平均25个月。治疗方案 患者被随机安排接受药物或安慰剂治疗,药物治疗任选下列四种方案…  相似文献   
96.
树突状细胞与肝脏疾病   总被引:9,自引:3,他引:6  
免疫反应的产生首先是由抗原提呈细胞(antigenpresenting cells,APC)捕获抗原,经其加工处理后将抗原信息传递给T,B淋巴细胞,从而引发一系列的特异性免疫应答.APC包括树突状细胞(dendritic cells,DC)、巨噬细胞(MΦ)、B细胞等,其中DC是人体内最具潜能的抗原提呈细胞(APC),能在体内外直接激活纯真(naive)T细胞,提呈抗原给MHC-Ⅰ类限制性CD8+和MHC-Ⅱ类限制性CD4+T淋巴细胞,诱导特异性免疫应答[1-6].  相似文献   
97.
In this work, the quantitative determination of an erectile dysfunctional drug avanafil in the presence of its acid-induced degradation product was achieved via the application of a pre-optimized novel spectrofluorimetric method. The fluorescence emission wavelength was recorded at 370 and 407 nm, after being excited at 268 and 271 nm for avanafil and its acid-induced degradation product, respectively. Direct determination of avanafil based on its native fluorescence is restricted because the emission spectra of both components are heavily overlapped. Therefore, to overcome this constraint, a novel second derivative synchronous fluorescence method was evolved to eliminate this overlapping. The ideal determination wavelength was found to be 377 nm. Augmentation of lean six sigma (LSS) with response surface methodology (RSM) play a significant role in the development of robust specifications to ensure quality at the six sigma level with a high level of statistical confidence and targeted performance. All of the experimental conditions were optimized using D-optimal design as a RSM to select the optimal parameters. In addition, this work includes a graphical representation of the relationships between various variables that can greatly affect the results and the intensity of the synchronous fluorescence.

In this work, the quantitative determination of an erectile dysfunctional drug avanafil in the presence of its acid-induced degradation product was achieved via the application of a pre-optimized novel spectrofluorimetric method.  相似文献   
98.
99.
Background: Different imaging techniques can be used for assessment of chest problems in ICU patients, however ultrasound is a good diagnostic tool giving more information and at the same time without exposure to radiation and without risk of critical patient transfer.Aim of the work: The aim of this work was to study the role of thoracic ultrasound in assessment of ICU patients.Materials and methods: The study was carried out on 30 patients admitted to the ICU.B and M modes chest ultrasound was done for all patients using EsaoteMyLab?Alpha with eHD Technology.Results: The study included 19 males and 11 females with mean age of 42.6 ± 21.4 years. In this study ultrasound was able to diagnose Pneumothorax: 3 cases (10%). Pleural effusion: 20 cases (66.6%). Alveolar interstitial syndrome: 7 cases (23.3%). Lung consolidation: 20 cases (66.6%). Pulmonary infarcts: 1 case (3.3%). Neoplastic disease: 1 case (3.3%). Chest wall pathology: 1 case (3.3%).Conclusion: Ultrasound examination of the chest is a non- invasive, and promising bed side tool for examination of ICU patients.  相似文献   
100.

Introduction

Cystic pancreatic lesions are currently discovered at higher rate, hence adequate characterization of these lesions by the radiologist is important in guiding management.

Aim of the work

Was to identify the role of MRI in characterization of cystic pancreatic lesions.

Patients and methods

Thirty patients with suspected cystic lesions of the pancreas were examined by MRI using 1.5?T machines including conventional MRI sequences, dynamic contrast enhanced imaging, DWI and IP/OP sequence.

Results

The study included 30 patients (12 males and 18 females) with their age ranging from 16 to 88?years (mean age 55?years), MRI analysis of the cyst contents and communication with ductal system were used to characterize different cyst types, among these patients we found serous cystadenoma in five patients, mucinous cystadenoma in seven patients, mucinous cystadenocarcinoma in one patient, branch type Intraductal papillary mucinous neoplasms (IPMN) in seven patients, Mixed IPMN in two patients. Cystic neuroendocrine tumors (CNET) in three patients. Solid cystic pancreatic neoplasm (SPN) in two patients. Pseudocyst in one patient and walled off necrosis (WON) in two patients. Pathological assessment of the lesions was done whenever indicated.

Conclusions

MRI with its superior soft tissue resolution is of value in characterization of different cystic pancreatic lesions helping to reach the correct diagnosis.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号