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   1404817篇
  免费   101836篇
  国内免费   2563篇
耳鼻咽喉   19752篇
儿科学   45545篇
妇产科学   40289篇
基础医学   203183篇
口腔科学   38211篇
临床医学   120912篇
内科学   277588篇
皮肤病学   28110篇
神经病学   110841篇
特种医学   55080篇
外国民族医学   366篇
外科学   217686篇
综合类   28341篇
现状与发展   2篇
一般理论   480篇
预防医学   104644篇
眼科学   31796篇
药学   106885篇
  3篇
中国医学   2632篇
肿瘤学   76870篇
  2018年   14536篇
  2016年   12180篇
  2015年   14151篇
  2014年   19730篇
  2013年   30013篇
  2012年   41780篇
  2011年   44576篇
  2010年   26112篇
  2009年   24467篇
  2008年   42690篇
  2007年   46167篇
  2006年   46395篇
  2005年   45800篇
  2004年   44069篇
  2003年   42619篇
  2002年   41952篇
  2001年   59439篇
  2000年   60780篇
  1999年   52102篇
  1998年   15755篇
  1997年   14043篇
  1996年   14297篇
  1995年   13487篇
  1994年   12709篇
  1993年   11820篇
  1992年   41881篇
  1991年   41284篇
  1990年   40700篇
  1989年   39520篇
  1988年   36923篇
  1987年   36146篇
  1986年   34572篇
  1985年   33054篇
  1984年   24845篇
  1983年   21705篇
  1982年   13475篇
  1981年   12040篇
  1980年   11146篇
  1979年   23313篇
  1978年   16565篇
  1977年   14332篇
  1976年   13493篇
  1975年   14690篇
  1974年   17159篇
  1973年   16555篇
  1972年   15655篇
  1971年   14569篇
  1970年   13503篇
  1969年   12956篇
  1968年   12209篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
There is some evidence suggesting that Parkinson's disease (PD) patients exhibit lower body weight when compared to age-matched healthy subjects. Low body mass index (BMI) is correlated with low bone mineral density, both of which are major risk factors for hip fractures. Possible determinants of weight loss in PD patients include hyposmia, impaired hand-mouth coordination, difficulty chewing, dysphagia, intestinal hypomotility, depression, decreased reward processing of dopaminergic mesolimbic regions, nausea, and anorexia as the side effects of medication, and increased energy requirements due to muscular rigidity and involuntary movements. It is unclear whether PD patients in general, or only a subgroup of those affected, definitely show lower BMI in the advanced stages of the disease. We therefore recommend that the body weight of PD patients be monitored monthly as the disease progresses, and that a patient's nutrition should be supplemented with sufficient amounts of vitamin D and calcium to reduce the risk of hip fractures and strengthen bone density. Because meal times may coincide with unpredictable off periods associated with akinesia and impaired hand-mouth coordination, PD patients also need flexible food schedules that accommodate the associated symptoms of this disease.  相似文献   
22.
23.
Abstract: Background: Fetal pulse oximetry improves the assessment of fetal well‐being during labor. The objective of this study was to evaluate women's satisfaction with their experience with this additional technology. Methods: We surveyed women participating in the FOREMOST trial, a randomized controlled trial comparing the addition of fetal pulse oximetry (FPO) to conventional cardiotocograph (CTG) monitoring (intervention group), versus CTG‐only (control group), in the presence of nonreassuring fetal status during labor. Our survey evaluated 3 aspects of women's experience: labor, fetal monitoring, and participation in the research. The survey was administered within a few days of giving birth and repeated 3 months later. Results: No differences were found between the intervention and control groups for women's evaluations of their labor, fetal monitoring, research, or overall experiences when surveyed on both occasions. Within each study group, a small but statistically significant decline occurred in women's scores for their experience of labor and overall experience from the initial survey close to the time of giving birth, to 3 months later. The magnitude of differences in responses over time was similar for the both groups. Women were more satisfied after a spontaneous or assisted vaginal birth than after cesarean section. Length of time the research midwife was present had a significant positive effect on women's ratings of their experience several days after giving birth (p = 0.006), but no effect at 3 months. Conclusions: The addition of fetal pulse oximetry for the assessment of fetal well‐being during labor did not affect childbearing women's perceptions of fetal monitoring or their labor. Women evaluated their experience in the research process positively overall. Small changes occurred in women's perception of their satisfaction over time. (BIRTH 33:2 June 2006)  相似文献   
24.
25.
We report the case of a 38-year-old woman who presented with chronic lower abdominal pain. Her past medical history included a splenectomy due to abdominal trauma. Ultrasound examination revealed four pelvic tumors which, upon laparotomy, were found to be the result of splenosis. Approximately 100 cases of splenosis have been reported but only a minority of them have been published in the gynecological literature. Our case indicates that those involved in pelvic scanning (even of asymptomatic women) and/or treating those complaining of lower abdominal pain or presenting with pelvic tumors should be aware of splenosis as a possible diagnosis.  相似文献   
26.
27.
28.
29.
Neu-Laxova syndrome (NLS) is a rare autosomal recessive syndrome, characterized by severe intrauterine growth retardation (IUGR), microcephaly, abnormal brain development, oedema and ichthyosis. It was first reported in 1971 by Neu et al. (Pediatrics 47: 610-612) and since then no more than 60 cases have been reported. A newborn girl delivered from a 29-year-old healthy mother was admitted to hospital with a thick membrane covering her body and dismorphic appearance. The diagnosis of NLS was made according to characteristic features. The syndrome is known to have a poor prognosis and the baby lived for 9 weeks. This case is one of the longest living cases of NLS and the fourth case reported from Turkey.  相似文献   
30.
Leocani  L.  Comi  G. 《Neurological sciences》2006,27(1):s27-s29
Neurological Sciences - Brain plasticity, intended as the pattern of functional and structural changes in responses to environmental physiological or pathological events, is underlined by several...  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