全文获取类型
收费全文 | 614篇 |
免费 | 9篇 |
国内免费 | 34篇 |
专业分类
儿科学 | 16篇 |
妇产科学 | 1篇 |
基础医学 | 51篇 |
口腔科学 | 8篇 |
临床医学 | 43篇 |
内科学 | 73篇 |
皮肤病学 | 7篇 |
神经病学 | 105篇 |
特种医学 | 170篇 |
外科学 | 40篇 |
综合类 | 19篇 |
预防医学 | 79篇 |
眼科学 | 11篇 |
药学 | 15篇 |
中国医学 | 1篇 |
肿瘤学 | 18篇 |
出版年
2023年 | 4篇 |
2022年 | 5篇 |
2021年 | 8篇 |
2020年 | 5篇 |
2019年 | 1篇 |
2018年 | 12篇 |
2017年 | 9篇 |
2016年 | 11篇 |
2015年 | 17篇 |
2014年 | 15篇 |
2013年 | 14篇 |
2012年 | 31篇 |
2011年 | 29篇 |
2010年 | 25篇 |
2009年 | 41篇 |
2008年 | 34篇 |
2007年 | 41篇 |
2006年 | 34篇 |
2005年 | 31篇 |
2004年 | 16篇 |
2003年 | 9篇 |
2002年 | 17篇 |
2001年 | 24篇 |
2000年 | 11篇 |
1999年 | 21篇 |
1998年 | 26篇 |
1997年 | 33篇 |
1996年 | 20篇 |
1995年 | 11篇 |
1994年 | 8篇 |
1993年 | 12篇 |
1992年 | 5篇 |
1991年 | 1篇 |
1990年 | 6篇 |
1989年 | 13篇 |
1988年 | 18篇 |
1987年 | 7篇 |
1986年 | 8篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 5篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 3篇 |
1976年 | 1篇 |
1975年 | 3篇 |
排序方式: 共有657条查询结果,搜索用时 31 毫秒
71.
Heike Kölsch Michael Wagner Andras Bilkei-Gorzó Mohammad Reza Toliat Michael Pentzek Angela Fuchs Hanna Kaduszkiewicz Hendrik van den Bussche Steffi G. Riedel-Heller Matthias C. Angermeyer Siegfried Weyerer Jochen Werle Horst Bickel Edelgard Mösch Birgitt Wiese Moritz Daerr Frank Jessen Wolfgang Maier Martin Dichgans 《Journal of neural transmission (Vienna, Austria : 1996)》2009,116(7):897-903
Cognitive functions show large variation in elderly people and are substantially heritable. Animal studies revealed that dynorphins influence cognition and memory, especially in aged animals. Thus, we tested the effect of four SNPs (rs7272891, rs1997794, rs2235751 and rs910080) and the VNTR promoter polymorphism in the prodynorphin gene (PDYN) on episodic memory and verbal fluency in a large (n = 1619) sample of elderly people (mean age: 80 ± 3.39 years; range 75–90 years) recruited through the German study on ageing, cognition and dementia in primary care patients (AgeCoDe). We found that carriers of the minor alleles of rs1997794 (P < 0.002) and rs910080 (P < 0.005) presented with higher episodic memory scores than homozygote carriers of the major allele. Also, a three marker haplotype including these two SNPs and rs2235751 was associated with better episodic memory scores. Verbal fluency scores were non-significantly better in carriers of these respective alleles. Thus, our results suggest a role of PDYN gene variations in determining memory function also in elderly humans. 相似文献
72.
Per Y Adolphson Mats OF Salemyr Olof G Sk?ldenberg Henrik SG Bodén 《Acta orthopaedica》2009,80(1):14-19
Background and purpose Periprosthetic bone loss after uncemented femoral hip revision is a matter of concern. We have used a proximally porous- and hydroxyapatite-coated prosthesis (Bi-Metric) in revision since 1989 and now we report the bone changes. This prosthesis is intended to distribute the forces more evenly and to avoid proximal femoral unloading.Methods 22 patients were unilaterally reoperated because of aseptic loosening. Only patients with a healthy contralateral hip were included. Mean age at revision was 69 (55–80) years. Bone defects were graded by Gustilo-Pasternak and Endo-Klinik classifications. Clinical assessment was performed with Harris hip score. We used radiographs and dual-energy X-ray absorptiometry to evaluate migration, femoral remodeling, and bone mineral density after 72 (30–158) months.Results The mean Harris hip score was 74 (30–100) points at follow-up. Mild thigh discomfort was present in 1 patient and moderate thigh pain in 3 patients. There was no loosening or subsidence. Osteolysis seen at revision had diminished in 19 of the 22 hips at follow-up. We noted a large reduction in bone mineral density. It was most pronounced in Gruen regions 1, 2, 6, and 7.Interpretation Revision with this stem is a reliable procedure; however, we noted a large degree of proximal bone loss that could lead to later mechanical complications or fractures. 相似文献
73.
Background
In persons
free of dementia, accelerated cognitive
decline might be an indicator
of pathological impairment and a
potential predictor of future dementia.
However, the reliable detection
of cognitive decline is a challenging
task in some cases.
Changes in psychometric test
scores do not necessarily result
from ‘true’ clinical change and may
result from factors like measurement
error and regression to the
mean. Reliable Change Indices
(RCI) facilitate the interpretation of
changes in psychometric test
scores. However, it is unknown
whether RCI predict future dementia
in persons who are presently
free of dementia.
Aim
To examine
for a widely used screening instrument
for cognitive impairment and
dementia (SIDAM) whether RCI
methods contribute to the prediction
of dementia diagnosis in older
adults who are presently free of dementia.
Methods
A sample of 554
elderly individuals aged 75 and
over who participated in the
Leipzig Longitudinal Study of the
Aged (LEILA 75+) and had no diagnosis
of dementia at the first two
visits. Participants have been tested
with the test part of the SIDAM at
maximal six visits with 1.5 year intervals.
In all participants, RCI for
change in SIDAM score (Time 1 to
Time 2) have been computed. The
main outcome measure was the diagnosis
of dementia.
Results
ROC
analyses showed that RCI were significant
predictors of future dementia.
Participants who deteriorated
in SIDAM score –4 points or
more had a three-fold increased
risk of developing dementia (odds
ratio 2.71, CI 1.6 to 4.6). However,
RCI were not independent predictors
of dementia in multivariate
analysis.
Conclusion
RCI may support
the early diagnosis of dementia. 相似文献
74.
Roick C Fritz-Wieacker A Matschinger H Heider D Schindler J Riedel-Heller S Angermeyer MC 《Social psychiatry and psychiatric epidemiology》2007,42(4):268-276
Background The aim of the study was to analyze the physical activity, dietary, drinking, and smoking habits of schizophrenia patients
(SP).
Methods Data from 194 schizophrenia outpatients collected using sections of the German National Health Interview and Examination Survey
were compared with data from the German general population (GP). In addition to univariate data analyses, a multivariate regression
analysis was performed.
Results Schizophrenia patients have a supper snack more frequently, consume instant meals and calorie-reduced food more frequently,
and eat healthy groceries more rarely. Though they drink less alcohol, a greater proportion currently smokes, smoking on average
4 cigarettes more per day. On workdays they spend less time with strenuous activities, and in leisure time a greater proportion
is involved in no sports. Regression analysis revealed that schizophrenia by itself or in interaction with demographic variables
influences physical activity as well as alcohol, nicotine, and healthy grocery consumption. Health habits were particularly
disadvantageously affected by schizophrenia in connection with unemployment.
Conclusions Schizophrenia patients are an appropriate target group for public health interventions. They need information about a healthy
diet and motivation to prepare their own meals, to quit smoking, and to exercise. 相似文献
75.
Kuske B Hanns S Luck T Angermeyer MC Behrens J Riedel-Heller SG 《International psychogeriatrics / IPA》2007,19(5):818-841
BACKGROUND: We reviewed studies of in-service interventions for caregivers of persons with dementia in nursing homes published between 1990 and 2004. The aim was to obtain an overview of the evaluated interventions and to characterize their methodological quality. METHODS: A thorough literature search was conducted, including searching electronic databases for selected intervention studies and previous reviews. Selected studies were summarized and compared along certain categories, and methodological quality was assessed. RESULTS: A total of 21 studies were identified, mostly published in the United States. Most were of poor methodological quality. Although nearly all reported positive effects, their results must be interpreted cautiously due to methodological weaknesses. Extensive interventions with ongoing support successfully demonstrated sustained implementation of new knowledge. Owing to methodological weaknesses and a lack of follow-up evaluations, little or no evidence existed for the efficacy or, particularly, the transfer of knowledge in simpler interventions when reinforcing and enabling factors were not present. CONCLUSION: On an international and, particularly, on a national level a lack of evaluated in-service training programs for caregivers in homes for people with dementia is apparent. Methodological weakness is common. This study highlights the need for well-defined methodologically improved studies, providing conclusive evidence of the effects of intervention types to help improve the quality of dementia care. 相似文献
76.
Thomas Kerr Brandon DL Marshall Cari Miller Kate Shannon Ruth Zhang Julio SG Montaner Evan Wood 《BMC public health》2009,9(1):171-7
Background
Street-involved youth contend with an array of health and social challenges, including elevated rates of blood-borne infections and mortality. In addition, there has been growing concern regarding high-risk drug use among street-involved youth, in particular injection drug use. We undertook this study to examine the prevalence of injection drug use and associated risks among street-involved youth in Vancouver, Canada. 相似文献77.
Christina Kim Thomas Kerr Kathy Li Ruth Zhang Mark W Tyndall Julio SG Montaner Evan Wood 《BMC public health》2009,9(1):270
Background
There has emerged growing recognition of the link between housing and health. Since Vancouver, Canada has had increasing concerns with homelessness brought about by urban renewal in the lead-up to the 2010 Winter Olympic Games, we evaluated hepatitis C virus (HCV) incidence among injection drug users (IDU) with and without stable housing. 相似文献78.
Dr. I. Bermejo G. Kl?rs K. B?hm J. Hundertmark-Mayser T. Lampert U. Maschewsky-Schneider S. Riedel-Heller M. H?rter 《Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz》2009,52(10):897-904
In 2006, Germany’s sixth national health target entitled “Depressive illnesses – prevention, early diagnosis, sustainable treatment” was developed by an interdisciplinary group of experts. A total of six areas of activity and proposals for action with potential for improvement were defined. Subsequently, a group of experts was entrusted with designing evaluation strategies, defining indicators of progress, and examining the accessibility of data sources for evaluation. For the primary start-up activities set out in the health targets, specific progress indicators were deduced, and routine data available for evaluation were identified. As a next step, the limitations of these data sources were analyzed and necessary improvements described. Relevant indicators of progress for specific areas of activity have been described, the availability and usability of different existing data sources examined, and further supplements or additional specifications with respect to the indicators described. Due to inadequate data sources, additional systematic surveys are required to evaluate the health target and its implementation. Existing German surveys should be extended by questions concerning relevant measures and progress indicators; various progress indicators should be analyzed on a general basis. 相似文献
79.
80.