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   15369篇
  免费   1023篇
  国内免费   104篇
耳鼻咽喉   183篇
儿科学   399篇
妇产科学   518篇
基础医学   1878篇
口腔科学   496篇
临床医学   1194篇
内科学   3435篇
皮肤病学   310篇
神经病学   709篇
特种医学   489篇
外国民族医学   5篇
外科学   2398篇
综合类   378篇
现状与发展   2篇
一般理论   9篇
预防医学   975篇
眼科学   491篇
药学   1556篇
中国医学   144篇
肿瘤学   927篇
  2023年   181篇
  2022年   178篇
  2021年   621篇
  2020年   516篇
  2019年   668篇
  2018年   784篇
  2017年   535篇
  2016年   515篇
  2015年   501篇
  2014年   686篇
  2013年   861篇
  2012年   1210篇
  2011年   1178篇
  2010年   697篇
  2009年   544篇
  2008年   837篇
  2007年   827篇
  2006年   705篇
  2005年   728篇
  2004年   599篇
  2003年   530篇
  2002年   464篇
  2001年   193篇
  2000年   165篇
  1999年   177篇
  1998年   88篇
  1997年   59篇
  1996年   69篇
  1995年   70篇
  1994年   60篇
  1993年   49篇
  1992年   95篇
  1991年   84篇
  1990年   95篇
  1989年   84篇
  1988年   84篇
  1987年   82篇
  1986年   82篇
  1985年   73篇
  1984年   53篇
  1983年   43篇
  1982年   33篇
  1981年   25篇
  1980年   36篇
  1979年   46篇
  1977年   37篇
  1976年   35篇
  1975年   23篇
  1974年   21篇
  1973年   21篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Clinical and Experimental Medicine - Virological responses after hepatitis C virus (HCV) treatment may alleviate liver disease and extra-hepatic manifestations. Our study aims to explore the impact...  相似文献   
2.
AIM: To compare the diagnostic ability of glaucoma parameters measured by the optical coherence tomography (OCT) in normal, preperimetric glaucoma (PPG) and perimetric glaucoma (PG) patients. METHODS: This cross-sectional observational study includes 127 eyes of 127 subjects. Patients were divided into PPG (51 eyes), PG (46 eyes), and normal controls (30 eyes) based on clinical optic disc assessment and Humphrey visual field changes. The Heidelberg Spectralis OCT machine using Glaucoma Module Premium Edition software was used to measure the retinal nerve fiber layer (RNFL) and Bruch’s membrane opening-minimum rim width (BMO-MRW) to assess the optic nerve head and ganglion cell layer (GCL) thickness in the macula. RESULTS: RNFL, MRW, and GCL thickness were all significantly thinner in PG compared to PPG and the normal group. The BMO-MRW parameters showed better specificity (>70%) at 90% specificity compared to both RNFL and GCL parameters to discriminate normal, PPG, and PG patients. All BMO-MRW parameters showed higher area under curves (AUC) compared to RNFL and GCL parameters with the highest AUC observed in the superotemporal sector of the BMO-MRW (AUC=0.819 and and 0.897 between normal and PPG and PG groups respectively). CONCLUSION: While the BMO-MRW best discriminates PPG and PG against normal eyes, GCL parameters poorly differentiate the three groups.  相似文献   
3.
Kiaei  Lily  Kiaei  Mahmoud 《Metabolic brain disease》2022,37(6):1697-1702
Metabolic Brain Disease - Amyotrophic lateral sclerosis (ALS), a fatal neurodegenerative disease, leads to the loss of motor neurons. There are currently no effective therapies to treat this...  相似文献   
4.

Background

The purpose of this study was to evaluate the foot involvement in a group of patients with spondyloarthritis in regard to symptoms, type and frequency of deformities, location and radiological changes.

Methods

We conducted a cross sectional study including 60 patients with spondyloarthritis over a period of six months. Anamnesis, clinical examination, podoscopic examination, biological tests and X-rays of feet were done for each patient.

Results

Foot involvement was found in 31 patients (52%). It was symptomatic in 35% of cases and inaugural in 42% of cases. The most frequent site was the hindfoot (22 patients/31). Radiological findings were: erosion (17%), reconstruction (33%), erosion and reconstruction (50%). Forefoot involvement was found in 18/31 patients. Forefoot deformities were found in 9 patients. Two patients had sausage toe and feet skin abnormalities were observed in 12 patients. At podoscopic examination, 23 patients had abnormal footprints. Foot involvement was more frequent in peripheral spondyloarthritis (p = 0.008). Patients with foot involvement had an advanced age of disease onset (p = 0.05), a shorter disease duration (p = 0.038) and more comorbidities (p = 0.039). Foot involvement was correlated with C Reactive protein (p = 0.043).

Conclusion

In our study, foot involvement and foot symptoms were seen frequently in spondyloarthritis and it is associated with late onset of the disease and with higher inflammation in blood tests.  相似文献   
5.
6.
Objectives:To review the experience of 2 tertiary centers in Saudi Arabia with intracranial hypertension (IH) in the pediatric population.Methods:We retrospectively reviewed and analyzed pediatric patients diagnosed with IH from June 2002 to May 2017 in 2 institutes.Results:We identified 53 patients (30 females and 23 males) with a mean age of 7 years at the time of presentation. Among them, 41 patients were younger than 12 years, and 12 were older. Obese and overweight patients constituted 27.00% (n = 14) of all cases, 8 (66.7%) of whom were older than 12 years. The most common presenting feature was papilledema followed by headache. Vitamin D deficiency, which constituted the most common associated condition, was identified in 12 (22.6%) patients. Acetazolamide was the treatment option in 98.11% of patients, and only 5.7% underwent surgical interventions. The length of follow-up ranged from 6 months to 8 years.Conclusion:Intracranial hypertension is rare in children and commonly seen in overweight females older than 12 years similar to adults. Patients younger than 12 years tend to develop secondary IH. More studies are needed to characterize the clinical presentation and guide the management plan.

Intracranial hypertension (IH) is rarely reported in children. It is characterized by increased intracranial pressure (ICP) without any evidence of underlying brain pathology, structural abnormalities, hydrocephalus, or any abnormal meningeal enhancement.1 The incidence of IH differs from region to region due to variations in the prevalence of obesity and other secondary causes. The annual incidence of IH in children is 0.9 per 100,000 in the United States,2 0.5 per 100,000 in Germany,3 0.6 per 100,000 in Nova Scotia and Prince Edward Island in Eastern Canada,4 and 1.2 per 100,000 in Croatia.5 A study carried out in Oman estimated the incidence of IH to be 1.9 per 100,000 in children below 15 years of age; with it being higher in female children.6 The present study aimed to review the clinical presentation, possible aetiological factors, diagnosis, management, and outcomes in children with IH in 2 tertiary institutes in Saudi Arabia.  相似文献   
7.

Objectives

Iatrogenic injury of the Profunda Femoris Artery (PFA) at time of hip fixation surgery can increase morbidity and mortality and prolong the hospital stay. This is an injury that tends to pass unnoticed as a cause of postoperative deterioration despite being frequently reported in the literature. Our study aims to describe the anatomy of the PFA in relation to the medial femoral cortex with specific emphasis on its orientation relative to the position of a sliding hip screw side plate construct. By doing so we are able to present clear guidance to orthopaedic surgeons on how to avoid iatrogenic PFA injury at the time of hip fracture fixation.

Methods

Using Computed Tomography Angiographic (CTA) studies, the course of the PFA in relation to the medial femoral cortex was traced in 44 patients (28 males and 16 females) with mean age of 65.6 years. Coronal and axial CT sections were cross-linked to specify the position of the PFA at 1?cm intervals.

Results

The course of the artery could be divided into three parts relative to a fixed reference point. Proximal and distal parts of the artery were in a safer position in comparison to the middle part of the artery that was found very close to the femoral cortex and along the coronal axis of the femur (mean angle 2.9° from the femoral coronal axis and 13.8?mm from the medial femoral cortex). Using the commercially available side plate constructs, this part of the artery corresponded to the distal part of the plate (third and fourth holes).

Conclusion

Special attention needs to be practiced by the operating surgeon while drilling into the third and fourth holes of the side plate.  相似文献   
8.
Clinical and Experimental Medicine - Identification of host genetic factors influencing the risk of developing hepatocellular carcinoma (HCC) in patients with chronic hepatitis C virus (HCV)...  相似文献   
9.
Dental pulp stem cells (DPSCs) have emerged as a promising tool with great potential for use in tissue regeneration and engineering. Some of the main advantages of these cells are their multifaceted differentiation capacity, along with their high proliferation rate, a relative simplicity of extraction and culture that enables obtaining patient-specific cell lines for their use in autologous cell therapy. PubMed, Scopus and Google Scholar databases were searched for relevant articles related to the use of DPSCs in regeneration of dentin-pulp complex (DPC), periodontal tissues, salivary gland and craniomaxillofacial bone defects. Few studies were found regarding the use of DPSCs for regeneration of DPC. Scaffold-based combined with DPSCs isolated from healthy pulps was the strategy used for DPC regeneration. Studies involved subcutaneous implantation of scaffolds loaded with DPSCs pretreated with odontogenic media, or performed on human tooth root model as a root slice. Most of the studies were related to periodontal tissue regeneration which mainly utilized DPSCs/secretome. For periodontal tissues, DPSCs or their secretome were isolated from healthy or inflamed pulps and they were used either for preclinical or clinical studies. Regarding salivary gland regeneration, the submandibular gland was the only model used for the preclinical studies and DPSCs or their secretome were isolated only from healthy pulps and they were used in preclinical studies. Likewise, DPSCs have been studied for craniomaxillofacial bone defects in the form of mandibular, calvarial and craniofacial bone defects where DPSCs were isolated only from healthy pulps for preclinical and clinical studies. From the previous results, we can conclude that DPSCs is promising candidate for dental and oral tissue regeneration.  相似文献   
10.
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