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   2343篇
  免费   193篇
  国内免费   16篇
耳鼻咽喉   1篇
儿科学   283篇
妇产科学   647篇
基础医学   199篇
口腔科学   7篇
临床医学   235篇
内科学   198篇
皮肤病学   1篇
神经病学   124篇
特种医学   18篇
外科学   42篇
综合类   282篇
一般理论   1篇
预防医学   354篇
眼科学   9篇
药学   108篇
  6篇
中国医学   20篇
肿瘤学   17篇
  2024年   8篇
  2023年   38篇
  2022年   59篇
  2021年   95篇
  2020年   97篇
  2019年   100篇
  2018年   103篇
  2017年   130篇
  2016年   108篇
  2015年   82篇
  2014年   101篇
  2013年   244篇
  2012年   117篇
  2011年   100篇
  2010年   88篇
  2009年   101篇
  2008年   100篇
  2007年   95篇
  2006年   97篇
  2005年   63篇
  2004年   71篇
  2003年   53篇
  2002年   43篇
  2001年   46篇
  2000年   36篇
  1999年   40篇
  1998年   31篇
  1997年   30篇
  1996年   23篇
  1995年   23篇
  1994年   26篇
  1993年   14篇
  1992年   14篇
  1991年   14篇
  1990年   23篇
  1989年   21篇
  1988年   13篇
  1987年   8篇
  1986年   20篇
  1985年   16篇
  1984年   8篇
  1983年   6篇
  1982年   7篇
  1981年   8篇
  1980年   5篇
  1979年   9篇
  1977年   3篇
  1975年   3篇
  1973年   2篇
  1971年   2篇
排序方式: 共有2552条查询结果,搜索用时 15 毫秒
41.
42.
43.
With advances in the care of HIV-positive pregnant women, the likelihood of perinatal transmission is now less than 1%. In resource-rich settings women are instructed to abstain from breastfeeding, as studies have shown that breastfeeding increases the likelihood of infant acquisition of HIV. As practitioners caring for HIV-positive parents, we are now facing growing tension about the complex issues that inform decisions about infant feeding. In the face of changing guidelines and global immigration patterns, simply telling women that breastfeeding is contraindicated may no longer be good enough. We must fully open the lines of communication regarding this important and evolving issue. This commentary will review the clinical, social and cultural considerations that impact decisions regarding infant feeding in the context of HIV.  相似文献   
44.
胡伟 《当代医学》2013,(24):38-38
目的探讨孕妇围产期的营养注意和身体调节对围产期结局的影响。方法选择孕妇1200例,其中共有587例患者进行了科学营养注意和身体调节,将其设置为观察组,其余孕妇设置为对照组。对两组患者的并发症情况进行统计分析。结果观察组孕妇并发症发生率、新生儿窒息等概率明显低于对照组,P<0.05,差异具有统计学意义。结论对孕妇进行围产期的营养指导和身体调节,能够有效降低孕妇发生并发症的几率,明显改善围产期结局。  相似文献   
45.
Black women have long experienced racism in various areas of their lives. Pregnancy is one of the times in a woman’s life when she is most vulnerable, and she should not have to worry that her health care will be subpar simply because she is Black. Most health care providers do not intend to harm their patients; however, systemic racism and the unconscious biases we hold may cause harm. Training nurses and other health care providers about implicit bias is one step toward eradicating racism from maternity care.  相似文献   
46.
Objective: To explore perinatal health care professionals’ perspectives on barriers and facilitators to addressing perinatal depression. Background: Perinatal depression is common and associated with deleterious effects on mother, foetus, child and family. Although the regular contact between mothers and perinatal health care professionals may make the obstetric setting ideal for addressing depression, barriers persist, and depression remains under-diagnosed and under-treated. Methods: Four 90-minute focus groups were conducted with perinatal health care professionals, including obstetric resident and attending physicians, licensed independent practitioners, nurses, patient care assistants, social workers and administrative support staff. Focus groups were transcribed, and resulting data were analysed using a grounded theory approach. Results: Participants identified patient-, provider- and system-level barriers and facilitators to addressing perinatal depression. Provider-level barriers included lack of resources, skills and confidence needed to diagnose, refer and treat perinatal depression. Limited access to mental health care and resources were identified as system-level barriers. Facilitators identified included targeted training for perinatal health care professionals’, structured screening and referral processes, and enhanced support and guidance from mental health providers. Conclusion: A complex set of interactions between women and perinatal health care professionals contributes to perinatal depression being untreated. Service gaps could be closed by addressing identified barriers through integrated obstetric and depression care and enhanced collaborations. Future intervention testing could include targeted training, improved access, and mental health provider support to empower perinatal health care professionals’ to address perinatal depression, and thereby improve delivery of depression treatment in obstetric settings.  相似文献   
47.
Objective: A dissociative experience refers to phenomena such as depersonalization, derealization, amnesia, out of body experience, altered time perception and body image. The aim of this study was to assess dissociative experience during childbirth and the possible related variables. Method: A total of 328 women, up to 72 hours postpartum, completed the peritraumatic dissociative experience questionnaire (PDEQ), the socio-demographic and obstetrical questionnaire, the pain numeric rating scale, the Trauma History Questionnaire and an SCID-I for traumatic events. Results: A total of 11.3% of the sample experienced significant dissociation. In particular, symptoms like a sensation of time changes during the event/things seemed to be happening in slow motion, not being aware of things that happened, and disorientation. A traumatic childbirth, previous trauma, obstetrical complications, forceps, prematurity, complications with the baby, dissatisfaction with the maternity care, unemployment, high score pain during labor and years of schooling were the factors considered. Conclusion: Dissociative experiences can occur during childbirth.  相似文献   
48.
Objectives To estimate, by neonatal screening, the birth prevalence of congenital toxoplasmosis among live‐born infants in Sergipe state, Brazil, and to investigate the clinical features of affected infants. Methods Dried blood spot specimens obtained from 15 204 neonates were assayed for the presence of anti‐T. gondii IgM antibodies. Duplicate retesting was done in infants with positive and borderline results. Confirmatory testing in peripheral blood samples consisted of testing for anti‐T. gondii IgG and IgM in infants and mothers. Those with possible congenital toxoplasmosis were evaluated and followed up to a median age of 20 months. Congenital infection was confirmed in the presence of persisting anti‐T. gondii IgG antibodies beyond 12 months of age. All infants with confirmed infection were treated with pyrimethamine, sulfadiazine and folinic acid for 1 year. Results Fifty‐three infants had detectable IgM in dried blood spot specimens. Confirmatory testing was reactive in 39/50, of which, 38 completed follow‐up. Six of 15 204 newborns were diagnosed with congenital toxoplasmosis, resulting in an estimated birth prevalence of four per 10 000 [CI 95% 1.4–8.0]. Four infants (67%) showed signs of congenital toxoplasmosis in their first year of life; three (75%) had retinochoroidal scars, and one had cerebral calcifications. Two infants remained asymptomatic until 20 months of age. Conclusions The birth prevalence of congenital toxoplasmosis is high in the Brazilian state of Sergipe, with most of the infants showing ocular lesions. Preventive measures are strongly warranted.  相似文献   
49.
50.
Developmental toxicity caused by environmental exposure to heavy metals during the perinatal period has raised questions about offspring health. Cadmium (Cd) is an endocrine‐disrupting chemical with the potential to interfere with morphogenesis and susceptibility to diseases in reproductive organs. Taking into account that in the rat prostate morphogenesis occurs during the perinatal period, and that pregnant females absorb and retain more dietary Cd than their non‐pregnant counterparts, it is important to understand the effects of perinatal Cd exposure on the adult rat prostate. Therefore this study investigated the effects of gestational and lactational Cd exposure on adult offspring rat prostate histopathology. Pregnant rats (n = 20) were divided into two groups: Control (treated with aqueous solution of sodium acetate 10 mg/l) and treated (treated with aqueous solution of cadmium acetate 10 mg/l) administered in the drinking water. After weaning, male offspring from different litters (n = 10) received food and water ‘ad libitum’. The animals were euthanized at postnatal day 90 (PND90), the ventral prostates (VPs) were removed, weighed and examined histopathologically. Blood was collected for the measurement of testosterone (T) levels. Immunohistochemistry for androgen receptor (AR) and Ki67, and a TUNEL assay were performed. There were no differences in T levels, cell proliferation and apoptosis indexes, or AR immunostaining between the experimental groups. Stromal inflammatory foci and multifocal inflammation increased significantly in the treated group. These changes were associated with inflammatory reactive epithelial atypia and stromal fibrillar rearrangement. In conclusion, VP was permanently affected by perinatal Cd exposition, with increased incidence of inflammatory disorders with ageing.  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