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   3691篇
  免费   215篇
  国内免费   6篇
耳鼻咽喉   37篇
儿科学   119篇
妇产科学   31篇
基础医学   326篇
口腔科学   100篇
临床医学   294篇
内科学   895篇
皮肤病学   57篇
神经病学   251篇
特种医学   131篇
外科学   777篇
综合类   74篇
一般理论   1篇
预防医学   124篇
眼科学   153篇
药学   261篇
中国医学   3篇
肿瘤学   278篇
  2024年   1篇
  2023年   36篇
  2022年   80篇
  2021年   208篇
  2020年   79篇
  2019年   127篇
  2018年   158篇
  2017年   125篇
  2016年   137篇
  2015年   143篇
  2014年   199篇
  2013年   244篇
  2012年   335篇
  2011年   352篇
  2010年   205篇
  2009年   177篇
  2008年   225篇
  2007年   220篇
  2006年   152篇
  2005年   191篇
  2004年   164篇
  2003年   131篇
  2002年   107篇
  2001年   27篇
  2000年   9篇
  1999年   13篇
  1998年   16篇
  1997年   6篇
  1996年   5篇
  1995年   9篇
  1994年   8篇
  1993年   5篇
  1992年   5篇
  1991年   2篇
  1990年   4篇
  1989年   5篇
  1987年   1篇
  1970年   1篇
排序方式: 共有3912条查询结果,搜索用时 296 毫秒
51.
Health status of neonates in urban slums has not been studied in smaller towns. A questionnaire was administered to 154 families of 10 urban slums of Anand (population — 197351) and 160 families from 6 villages of Anand district. The socioeconomic and education status of the slum dwellers versus rural participants were significantly lower (P<0.001). Antenatal care (79.9 vs 94.4%, P<0.001), hospital delivery (82.5 vs 93.8%, P=0.002), neonatal follow-up (27.9 vs 78.8%, P<0.001), health seeking (56.5 vs 91.3%, P<0.001), essential newborn care and exclusive breastfeeding (6.5 vs 85.6%, P<0.001) were also lower in urban slums, as compared to villages, Care seeking was low in urban slums, Hindus and illiterate mothers. Health care and socioeconomic status of neonates in slums of smaller cities is poorer than in surrounding villages.  相似文献   
52.
Inflammation Research - Gallic acid (GA) a naturally occurring phenolic compound, known to possess antioxidant/anti-inflammatory activities. The aim of the present work was to investigate the...  相似文献   
53.
Purpose: The purpose of the study is to report the prognostic factors and outcomes of vitrectomy (PPV) with silicone oil tamponade in rhegmatogenous retinal detachment (RRD) secondary to acute retinal necrosis (ARN).

Methods: This retrospective, non-randomized, interventional comparative study included 38 eyes of 38 patients. All cases underwent PPV with silicone oil tamponade. The main outcome measure was improvement of final visual acuity relative to the presenting visual acuity and factors affecting the same Group A included eyes with favorable vision of 20/400 or better and Group B included the others.

Results: Group A included 16 eyes (42.10%), group B included 22 eyes (57.89%). In Group A 2 eyes out of 16 (12.5%) and in Group B 12 eyes out of 22 (54.54%) had RRD at presentation (p = 0.02, 95% CI for the difference 7.88–65.78%). The time interval between first presentation and development of RRD in Group A was 30.94 ± 38.8 days (median 30 days) whereas that in Group B was 10.81 ± 11.73 days (median 8 days) (p = 0.02). The odds of visual improvement post-vitrectomy when RRD occurred later was 8.4 (p = 0.01, 95% CI 1.53–46.1). The usage of systemic steroids (odds 5.2, p = 0.03, 95% CI 1.14–23.54) and oral valacyclovir (odds 4.33, p = 0.04, 95% CI 1.05–17.84) were associated with odds favoring a good visual outcome. Recurrent RRD was noted in 3/16 eyes (18.75%) in Group A and 13/22 eyes (59.09%) in Group B (p = 0.03).

Conclusion: Delayed occurrence of RRD after ARN is a good prognostic factor. Usage of systemic steroids and oral valacylocvir are associated with a favorable visual outcome when started before the onset of RRD.  相似文献   

54.
55.
56.
An epiphrenic oesophageal diverticulum is most commonly a pulsion diverticulum which develops consequent to protrusion of mucosa through the muscular wall of the distal oesophagus. Most of them are associated with underlying oesophageal motility disorders. The predominant symptoms are dysphagia with regurgitation, and sometimes retrosternal pain, if accompanied by spasm of the oesophagus. Surgical management is recommended for symptomatic patients. Traditional procedures include thoracotomy or laparotomy with excision of the diverticula, but these are associated with high morbidity. Laparoscopic approach is a safe treatment option associated with lesser morbidity. Here, we present a case of epiphrenic diverticulum which was treated by the robotic approach without any complication. There was also no associated motility abnormality in our case so fundoplication was not done. Robotic surgery is a useful tool while operating near the hiatus and gastro-oesophageal junction. We consider transhiatal robotic approach as a safe and easy approach for surgery of epiphrenic diverticulum.  相似文献   
57.
58.
Colorectal mucus is a key component of the protective gut barrier which is altered in inflammatory bowel disease (IBD). We aimed to cytologically characterize colorectal mucus non‐invasively collected from IBD patients using our new sampling technique. Colorectal mucus was self‐collected by 58 IBD patients comprising 31 ulcerative colitis (UC) and 27 Crohn's disease (CD) cases. The samples were examined cytologically, and immunocytochemically. Large numbers of well‐preserved granulocytes were typically detected (neutrophils undergoing degradation were observed as well). Plasma cells and erythrophagocytosis were present in 18.2% and 29.1% of cases, respectively, predominantly in patients with UC and distal CD. Immunocytochemical visualization of calprotectin in neutrophils, eosinophil‐derived neurotoxin in eosinophils and tumour necrosis factor‐α in macrophages was also achieved. Correct cytological diagnosis was made in 61.8% of analysed IBD cases. Our new method of colorectal mucus sampling provides highly informative material for cytology. Findings of the presence of plasmocytes and erythrophagocytosis in colorectal mucus are unique and may reflect previously unknown mechanisms of IBD pathogenesis. Immunocytochemical detection of inflammation biomarkers demonstrates the suitability of this material for biomarker quantification. These promising results suggest a potential role for colorectal mucus cytology in the non‐invasive diagnosis of IBD.  相似文献   
59.
The ligament of the head of femur (LHF) has gained clinical attention recently and is reported to contribute to hip stability. This study explores its morphology and morphometry, information that may help inform surgical decision making. Gross anatomical dissections were undertaken on 229 embalmed hips from European (n = 105) and Thai (n = 124) adult cadavers to examine LHF anatomy. Ligament morphometry was statistically compared at different sites, between sexes and sides. The origin of ligamental arteries and absence of the ligament were documented. The LHF was pyramidal or quadrangular in shape. Sub‐synovial fibrous bands originated from the transverse acetabular ligament, edges of the acetabular notch, and acetabular floor; less frequently from the hip joint capsule. Distally, the ligament flattened and converged onto the fovea capitis. The ligament was 22.3 ± 4.4 mm long and was significantly wider (P = 0.001) and thicker (P = 0.0003) at the fovea, compared to its mid‐zone. Branches of the obturator artery entered the acetabular foramen inferomedially and penetrated the middle third of the LHF. Blood vessels ran within the LHF and appeared to enter the fovea. The ligament was absent in 2.8% of Thai hips and there were no significant sex or side differences in ligament dimensions. The morphology of the LHF is complex. While individual variation was apparent, blood vessels were seen in the distal ligament. Precise information on LHF morphometry and attachment sites will help inform appropriate graft dimensions and choice of fixation sites necessary for ligament reconstruction. Clin. Anat., 2018. © 2018 Wiley Periodicals, Inc. Clin. Anat., 2018. © 2018 Wiley Periodicals, Inc.  相似文献   
60.
Plasmodium vivax infection is increasingly a major public health burden and the second most frequent human malaria. Higher levels of clinical severity and chloroquine resistance are major factors responsible for such increases. Malarial glomerular injury is uncommon and mainly observed in Plasmodium malariae-infected patients. Occasionally, transient immune complex-mediated glomerulonephritis is associated with Plasmodium falciparum infection. Coexistent crescentic glomerulonephritis and vivax malaria have not previously been reported. We report a fatal case of P. vivax malaria, who presented with acute renal failure. P. vivax monoinfection status was diagnosed with peripheral blood smear and rapid antigen test. Further evaluation for renal failure related to systemic illness and immunological markers were inconclusive. He was treated with antimalarial drugs, hemodialysis, and supportive therapy. Renal biopsy performed for nonrecovering renal failure reveled crescentic glomerulonephritis. This case highlights the need to thoroughly search for malaria-associated crescentic glomerulonephritis using renal biopsy after nonrecovering renal failure.  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