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   1655篇
  免费   206篇
  国内免费   26篇
耳鼻咽喉   6篇
儿科学   99篇
妇产科学   41篇
基础医学   138篇
口腔科学   89篇
临床医学   162篇
内科学   514篇
皮肤病学   33篇
神经病学   67篇
特种医学   147篇
外科学   172篇
综合类   39篇
预防医学   162篇
眼科学   9篇
药学   139篇
肿瘤学   70篇
  2021年   8篇
  2020年   10篇
  2019年   10篇
  2018年   17篇
  2017年   14篇
  2016年   15篇
  2015年   17篇
  2014年   18篇
  2013年   44篇
  2012年   62篇
  2011年   51篇
  2010年   35篇
  2009年   58篇
  2008年   58篇
  2007年   82篇
  2006年   42篇
  2005年   66篇
  2004年   53篇
  2003年   62篇
  2002年   56篇
  2001年   61篇
  2000年   53篇
  1999年   51篇
  1998年   50篇
  1997年   61篇
  1996年   75篇
  1995年   54篇
  1994年   49篇
  1993年   44篇
  1992年   33篇
  1991年   40篇
  1990年   33篇
  1989年   44篇
  1988年   45篇
  1987年   44篇
  1986年   46篇
  1985年   45篇
  1984年   30篇
  1983年   16篇
  1982年   18篇
  1981年   18篇
  1980年   17篇
  1979年   22篇
  1978年   11篇
  1977年   21篇
  1976年   16篇
  1975年   16篇
  1974年   14篇
  1971年   9篇
  1970年   9篇
排序方式: 共有1887条查询结果,搜索用时 15 毫秒
131.
The effect of oxytocin in induced labour on neonatal jaundice.   总被引:1,自引:0,他引:1  
A prospective study in 180 mothers and babies examined the effects of oxytocin in induced labour on plasma bilirubin levels in cord blood, as well as on the incidence of neonatal jaundice. Raised plasma bilirubin levels in cord blood, probably enhanced by breakdown of fetal red cells, appeared to be a dose dependent effect of oxytocin. Commensurate with this was the finding that a larger proportion of babies in the induced group manifested a greater severity of jaundice.  相似文献   
132.
A patient with progressive osteolysis of the carpal and tarsal bones with glomerulonephritis of unusual severity is described. There was a notable absence of osteodystrophy in this and other reported cases who had chronic renal failure.  相似文献   
133.
Abstract – Objectives: The aim of the study was to investigate the prevalence of orofacial pain (OFP) among young adults (30–31 years old) and to determine the effect of childhood and adulthood risk factors on the occurrence of OFP. Methods: Prospective cohort study to investigate dental and social effects of malocclusion and effectiveness of orthodontic treatment was conducted in Wales, United Kingdom. At 20‐year follow‐up 337 subjects aged 30–31 participated (74% from previous follow‐up aged 19–20 and 33% from the baseline) and were asked about OFP. Results: The prevalence of OFP was 23% (95% CI: 19%, 28%). Childhood factors, socio‐demographic, lifestyle, health behavior factors, history of orthodontic treatment and tooth wear were not associated with OFP. Participants with OFP were more likely to report that their teeth did not fit together properly [odds ratio (OR) = 12.4, 95% CI: 2.7–56.5) and reported previous trauma to the jaws (2.3; 1.3–4.2). Both diurnal and nocturnal teeth clenching and grinding were significantly associated with OFP (3.1; 1.4–7.1). Participants with frequent headaches had increased risk of having OFP (3.7; 1.6–8.4) while having reported 4–10 types of pain in other parts of the body other than the head, was associated with OR = 9.2 (3.7–23.0). An increased tendency to have OFP was seen in those individuals with higher levels of psychological distress (2.3; 1.4–3.9), high score on Life Event Inventory (2.6; 1.3–5.3), depressive symptoms (2.2; 1.2–4.0) and stress (2.2; 1.2–4.0). High self‐esteem associated with lower risk of OFP (0.5; 0.3–0.9). Conclusions: This study shows that OFP is frequently reported by young adults aged 30–31 and supports a multifactorial etiology with factors from many domains, including local mechanical factors, psychological and co‐morbidities. However, none of the childhood factors considered in this study were associated with OFP in adulthood.  相似文献   
134.
We present two patients with renovascular hypertension in association with neurofibromatosis. In both cases the diagnosis was established by angiography. The first patient suffered occlusion of the right renal artery combined with intrarenal arterial lesions. Treatment was by autotransplantation. The second patient suffered bilateral intrarenal arterial lesions alone and was treated medically. In both patients, control of the hypertension was established. We discuss the aetiology of renovascular hypertension in neurofibromatosis and consider its treatment.  相似文献   
135.
136.
137.
Objectives: Without good evidence, post‐swallow pharyngeal residue is considered abnormal. Our aim was to document residue from normal food and fluid boluses in young and elderly healthy populations. Design: Prospective, single‐blind assessment of residue severity from Fibreoptic Endoscopic Evaluation of Swallowing. Setting: Tertiary specialist ENT teaching hospital. Participants: Fifty‐one healthy participants; twenty‐one aged <40 and thirty aged 65+. Each swallowed six representative boluses. Outcomes: Two teams independently rated pharyngeal residue severity at 11 anatomical sites. Results: The mean residue scores were less than 1 when averaged across all boluses and anatomic sites. Differences due to age were slight. Conclusions: Our preliminary data indicate that substantial pharyngeal residue is not common in young or elderly, and probably indicates disordered swallowing.  相似文献   
138.
139.
During 1986 and 1987 parents in part of the Oxfordshire district health authority were given their child's health and development records while in the other part of the health district the records remained with the clinic. Between August 1988 and February 1989 an audit was made of a sample of parents attending child health clinics in the two areas: the study examined 284 parents who had parent held records and 168 who did not; how many records were available and if not, why not; how well and by whom records were completed and parents' views on who they felt should keep the record. Interviews revealed that parents with a parent held record liked the scheme and were confident about remembering to take the record to the clinic. Those without experience were less confident and more concerned about losing the record. At the time of the audit 7% of parent held records had been lost or forgotten, but 5% of clinic held records were not available for inspection. Overall, parent held records were more likely to have comments contributed by parents and to be more thoroughly completed by professionals. The results suggest that parent held records are not only workable but desirable.  相似文献   
140.
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