全文获取类型
收费全文 | 7047篇 |
免费 | 429篇 |
国内免费 | 27篇 |
专业分类
耳鼻咽喉 | 49篇 |
儿科学 | 333篇 |
妇产科学 | 138篇 |
基础医学 | 790篇 |
口腔科学 | 106篇 |
临床医学 | 1482篇 |
内科学 | 1213篇 |
皮肤病学 | 61篇 |
神经病学 | 522篇 |
特种医学 | 122篇 |
外科学 | 573篇 |
综合类 | 77篇 |
一般理论 | 9篇 |
预防医学 | 911篇 |
眼科学 | 84篇 |
药学 | 381篇 |
中国医学 | 1篇 |
肿瘤学 | 651篇 |
出版年
2024年 | 5篇 |
2023年 | 36篇 |
2022年 | 62篇 |
2021年 | 119篇 |
2020年 | 81篇 |
2019年 | 96篇 |
2018年 | 151篇 |
2017年 | 113篇 |
2016年 | 136篇 |
2015年 | 144篇 |
2014年 | 234篇 |
2013年 | 348篇 |
2012年 | 504篇 |
2011年 | 594篇 |
2010年 | 308篇 |
2009年 | 267篇 |
2008年 | 497篇 |
2007年 | 576篇 |
2006年 | 528篇 |
2005年 | 545篇 |
2004年 | 507篇 |
2003年 | 462篇 |
2002年 | 473篇 |
2001年 | 56篇 |
2000年 | 34篇 |
1999年 | 72篇 |
1998年 | 59篇 |
1997年 | 56篇 |
1996年 | 51篇 |
1995年 | 43篇 |
1994年 | 47篇 |
1993年 | 29篇 |
1992年 | 33篇 |
1991年 | 32篇 |
1990年 | 18篇 |
1989年 | 14篇 |
1988年 | 12篇 |
1987年 | 15篇 |
1986年 | 14篇 |
1985年 | 11篇 |
1984年 | 23篇 |
1983年 | 13篇 |
1982年 | 19篇 |
1981年 | 12篇 |
1980年 | 19篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1975年 | 4篇 |
1973年 | 4篇 |
1969年 | 6篇 |
排序方式: 共有7503条查询结果,搜索用时 15 毫秒
11.
CONTEXT: The limited information available on the oral health status of rural children in the United States makes it difficult to devise policy strategies to address perceived problems. PURPOSE: To document the oral health status and dental care utilization of US children by place of residence, METHODS: Data from National Health Interview Surveys for 1995, 1997, and 1998, and from the third National Health and Nutrition Examination Survey (1988-1994) were analyzed. FINDINGS: Children residing in rural areas were more likely to be uninsured for dental care than were children from urban areas (41.1% versus 34.7%). A greater percentage of rural than urban children reported unmet dental needs (7.5% versus 5.6%); there was no difference in self-reported poor dental status. Urban children were more likely than rural children to have visited the dentist in the past year (73.6% versus 69.9%) and were also more likely to be regular users of dental care (61.7% versus 51.4%). Differences in percentage of rural and urban children with caries lesions and caries experience were not significant. CONCLUSIONS: Children residing in rural areas have less access to and utilization of dental care compared to children residing in urban areas. Moreover, poor rural children display less utilization of dental services than poor urban children. Differences in the sum of decayed and filled primary teeth and the sum of decayed, missing, and filled permanent teeth were not significant. 相似文献
12.
Tony Hope Kathleen M. Tilling Kathy Gedling Janet M. Keene Sandra D. Cooper Christopher G. Fairburn 《International journal of geriatric psychiatry》1994,9(2):149-155
‘Wandering’ is one of the most troublesome of behavioural problems in dementia. The term ‘wandering’ covers many different types of behaviour. We examined the hypothesis that the different types of wandering behaviour seen in dementia from a scale using data collected on 83 elderly subjects suffering from either Alzheimer's disease or multiinfarct dementia. We reject the scaling hypothesis. Our data suggest that there are three main categories of wandering behaviour, and that one of these categories is usefully divided into four subcategories. 相似文献
13.
竞争已经拉开了序幕。对1型和2型糖尿病,各个制药厂家都希望通过研发可以更好的治疗疾病、改善患者生活质量以及最终能彻底的预防糖尿病并发症发生的新治疗方法来获得在这一领域内的重要位置。对于1型糖尿病来说,主要的趋势就是向人工胰腺发展从而可以更好的控制病情、预防或者降低疾病的并发症。可以实现此目标第一步的技术已经存在,包括DexCom有限公司的STS连续血糖检测系统(STS Continuous Glucose Monitoring System,于2005年通过FDA批准)以及最近才通过批准的美敦力有限公司的Guardian实时系统(Guardian REAL-TimeSystem)以… 相似文献
14.
This paper reports the findings from the first 2 years of the Belfast Youth Development Study. The Belfast Youth Development Study is a 5-year longitudinal investigation of the onset and development of adolescent drug using behaviours, the findings of the first 2 years from the study in relation to drug use patterns among the young people participating in the research are reported here. The findings show that while the majority of young people have not yet used an illicit substance, the study has seen a substantial increase in the numbers using such substances between year 1 and year 2. Boys still make up the majority of drug users in this period but there has been a substantial increase in the number of girls using illicit drugs and, more generally, an increase in the frequency of use among all those using such substances during this period. 相似文献
15.
Philip J. Bossart M.D. F.A.C.E.P. Lenard Brunsdale M.D. Matt Hughes M.D. B. J. Manaster M.D. Ph.D. Anthony Doyle M.D. Kathy Murray M.D. David Tripp Ph.D. 《Emergency radiology》1997,4(1):26-29
To determine the utility of the lateral view of the chest in emergency department patients, records of all patients who had had 2-view chest x-rays ordered in the emergency department were reviewed retrospectively. A study radiologist recorded a reading of the posteroanterior (PA) radiograph alone. The lateral radiograph was then provided, along with the PA view, and a second reading was recorded. A comparison was then made between the first and second readings.A total of 417 sets of x-rays were included. The PA view alone successfully diagnosed or suspected 92% of pulmonary nodules, 95% of effusions, 97% of cases of emphysema, 98% of pneumonias, and 100% of cases of cardiomegaly, pulmonary edema, interstitial pulmonary disease, and atelectasis.In the emergency department patient population, lateral views of the chest have minimal diagnostic yield and therefore may be used selectively to safely decrease the amount of breast radiation exposure to young women. 相似文献
16.
17.
18.
Linda Klieman MSN ANP Shauna Hyde MS RD CDE Kathy Berra MSN ANP William Haskell PhD 《Current cardiovascular risk reports》2007,1(4):335-339
The benefits of regular physical activity in older persons are numerous and well established. Regular physical activity in
older adults is associated with an overall improvement in health, functional capacity, quality of life, and independence.
Many questions arise for healthcare providers regarding an older person’s ability and motivation to be physically active.
The healthcare provider has a unique opportunity to assess the older client’s incentives, preferences, and abilities for physical
activities, as well as to prescribe a safe, appropriate, and enjoyable exercise plan. The exercise precription can be simple
yet thorough enough to ensure benefits in an older person’s health and functional capacity. 相似文献
19.
Kathy Dujardin Pascal Sockeel David Devos Marie Delliaux Pierre Krystkowiak Alain Destée Luc Defebvre 《Movement disorders》2007,22(6):778-784
The objective of this study was to use the Lille Apathy Rating Scale to assess apathy in a large population of Parkinson's disease (PD) patients and identify several different apathy profiles. One hundred fifty-nine patients with probable PD and 58 healthy controls participated in the study. Apathy was assessed using the Lille Apathy Rating Scale. Motor, cognitive, and depressive symptoms were rated on standardized scales. Data were analyzed using linear regression and multivariate analyses of variance. Thirty-two percent of the PD patients were classified as apathetic. Apathy was more frequent in patients with dementia. The four apathy dimensions contributed differently to the overall severity of the apathetic condition. Action initiation and intellectual curiosity had a marked influence. Linear regression analysis revealed that the apathy level was mainly determined by cognitive impairment, not associated with the severity of motor symptoms, and only associated with the apathy subcomponent of the Montgomery and Asberg Depression Rating Scale. Apathy is highly prevalent in PD patients. Apathy profiles vary according to the clinical presentation of PD. The high prevalence of apathy in PD suggests the involvement of frontal-subcortical circuits. Although the neurochemical substrate of apathy remains poorly characterized, the strong link between apathy and cognitive impairment observed in several studies suggests the participation of nondopaminergic circuits. 相似文献
20.
Nicholas N Nissen Jeremy Korman Thomas Kleisli Kathy E Magliato 《JSLS, Journal of the Society of Laparoendoscopic Surgeons》2005,9(4):481-484
Evaluation and management of abdominal pathology in patients with ventricular assist devices is likely to become increasingly important as the utilization of these devices expands. Ventricular assist devices represent a class of intracorporeal or paracorporeal mechanical devices that augment cardiac output in patients with congestive heart failure. Patients with ventricular assist devices supporting both right and left ventricles (biventricular assist devices) are uniquely challenging to the general surgeon because these devices restrict direct access to the abdominal cavity and because of the perioperative implications of biventricular heart failure. We describe herein the first reported successful laparoscopic cholecystectomy in a patient with a paracorporeal biventricular assist device. Cholecystectomy was performed in this patient for acute cholecystitis that occurred while the patient was awaiting heart transplantation. Our results add weight to the small body of evidence that laparoscopy is well tolerated in ventricular assist devices patients. The unique aspects of the biventricular assist device patient make laparoscopic abdominal intervention particularly suitable in this patient population. 相似文献