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   412篇
  免费   18篇
耳鼻咽喉   32篇
儿科学   9篇
妇产科学   3篇
基础医学   70篇
口腔科学   6篇
临床医学   35篇
内科学   61篇
皮肤病学   6篇
神经病学   36篇
特种医学   13篇
外科学   61篇
综合类   7篇
一般理论   1篇
预防医学   29篇
眼科学   1篇
药学   25篇
肿瘤学   35篇
  2023年   4篇
  2022年   5篇
  2021年   10篇
  2020年   6篇
  2019年   6篇
  2018年   8篇
  2017年   8篇
  2016年   7篇
  2015年   13篇
  2014年   17篇
  2013年   19篇
  2012年   32篇
  2011年   38篇
  2010年   24篇
  2009年   24篇
  2008年   35篇
  2007年   33篇
  2006年   23篇
  2005年   17篇
  2004年   21篇
  2003年   23篇
  2002年   10篇
  2001年   3篇
  2000年   3篇
  1998年   3篇
  1997年   2篇
  1996年   2篇
  1995年   1篇
  1994年   1篇
  1993年   3篇
  1992年   3篇
  1990年   1篇
  1988年   1篇
  1987年   4篇
  1984年   3篇
  1980年   1篇
  1977年   3篇
  1976年   2篇
  1975年   2篇
  1974年   2篇
  1973年   2篇
  1972年   2篇
  1970年   2篇
  1961年   1篇
排序方式: 共有430条查询结果,搜索用时 15 毫秒
421.
422.
423.

Objectives

The percentage of free prostate-specific antigen (%fPSA) improves the diagnostic accuracy for prostate cancer when the serum level of total PSA (tPSA) is elevated. Approximately 14% of men with a tPSA below 3 μg/l have prostate cancer on biopsy, but the diagnostic value of %fPSA in such men is rather unknown. The purpose was to estimate the impact of %fPSA on future prostate cancer risk among men with a normal tPSA in prostate cancer screening.

Subjects and methods

The first round of the Finnish arm of the European Randomized Trial for Screening of Prostate Cancer in 1996 to 1999 comprised 20,793 men aged 55–67 yr. Screen-negative men (tPSA level below 3.0 μg/l, n = 17,680) were followed up until the end of 2003. Cumulative risk of prostate cancer was calculated as a function of %fPSA.

Results

During the median follow-up of 5.8 yr (range, 0–7.7 yr), 327 men were diagnosed with prostate cancer and 25% of them had a Gleason score of 7 or higher. Five years after the first screening, cumulative risk of prostate cancer was 1.7% (95%CI, 1.5–1.9%). Men with a %fPSA in the lowest quartile (<14.2%) showed a 6.9-fold risk compared with those with a level in the highest quartile (>23.7%).

Conclusions

In men with a low serum tPSA, a low %fPSA is a strong predictor of later diagnosis of prostate cancer.  相似文献   
424.
There is only a paucity of studies concerning the pharmacological treatment of personality disorders per se. On the other hand the clinical use of medication in these conditions is quite high, although there is no effective psychopharmacological treatment of distinct personality disorders. The psychopharmacological treatment of patients suffering from a personality disorder focuses on distinct symptoms and its comorbidity. Some symptoms could also be associated with other disorders like depression or psychosis, which often makes an exact differentiation of these disorders and a personality disorder difficult. Since symptoms of personality disorders are ego-syntonic, chronic and very often dependent on psychosocial factors, it is unlikely that a solely psychopharmacological treatment will be successful in most patients with a personality disorder. However, severe syndromes like depressive, impulsive, aggressive, dissociative, anxious or psychotic features may render a pharmacotherapy necessary. For the treatment of depressive syndromes or impulsivity a medical therapy with serotonin reuptake inhibitors, for the treatment of psychotic syndromes a medication with atypical antipsychotics is recommended. Impulsive or aggressive behaviour could be treated with mood stabilizers as well. Furthermore, there are indications for the use of alpha2-agonists, micro-opiate-antagonists and omega-3 fatty acid. The general use of benzodiazepines should be avoided as well as polypragmasy. Advantages versus potential damage of a high dose pharmacotherapy should be carefully weighed against each other. This article gives an overview over the today's most common psychopharmacological treatment possibilities in patients with a personality disorder.  相似文献   
425.
426.
Epilepsy research suffers from a deficiency of systematic studies concerning the phenomenology of the contents of consciousness during seizures, partially because of the lack of suitable research methods. The Phenomenology of Consciousness Inventory (PCI), a standardized, valid, and reliable questionnaire, was used here to study which dimensions of the contents of consciousness are distorted during partial epileptic seizures compared with baseline. Further, the similarity of the altered pattern of subjective experiences across recurring seizures was also explored. Our results indicate that patients with epilepsy report alterations on most dimensions of the contents of consciousness in conjunction with seizures, but individual seizure experiences remain similar from one seizure to another. The PCI was found suitable for the assessment of subjective experiences during epileptic seizures and could be a valuable tool in providing new information about phenomenal consciousness in epilepsy in both the research and clinical settings.  相似文献   
427.
The aim of this study was to describe the underlying theory and the implementation of a 2-year individualized physical activity counseling intervention and to evaluate whether benefits persisted 1.5 years after the intervention. The sample included 632 sedentary 75- to 81-year-old participants. Data were collected in 2003-2005. The participants were randomly assigned to an intervention group and a control group. The intervention consisted of an individualized face-to-face meeting followed by telephone contacts every 4 months for 2 years, with the aim to increase participation in specific physical activities as well as to increase habitual physical activity. At the 2-year follow-up, the prevalence of physical activities in the intervention group vs. control group was as follows: supervised calisthenics training 20 vs. 16%, walking for fitness 69 vs. 62%, weight training 13 vs. 8% and water aerobics 19 vs. 7%. For water aerobics and walking for fitness, the treatment effect was significant [water aerobics odds ratio (OR) 2.49, 95% confidence interval (CI) 1.16-5.36, walking for fitness OR 1.58, 95% CI 1.05-2.40]. As to the other activities, the effect did not reach statistical significance. At the 1.5-year post-intervention, the follow-up results indicated that the intervention effect was still evident. The subgroup analyses suggested that physical activity counseling may be most efficacious among people with intact mobility, while those having manifest mobility limitations may not benefit from it. Older people who have manifest mobility limitations may need more face-to-face counseling.  相似文献   
428.
Berlin  Clara  Quante  Markus  Halm  Henry 《European spine journal》2023,32(4):1187-1195
Purpose

Adolescent idiopathic scoliosis (AIS) often correspond with hypo thoracic kyphosis (TK) or even lordosis. The aim of this study was to analyze the influence of posterior instrumentation in thoracic AIS.

Methods

Analysis of prospectively collected AIS-data with structural thoracic curves (Lenke type 1 & 2), operated 2010–2019 with pedicle screw dual rod systems in one scoliosis center. Follow-up (FU) minimum 24 months. Coronal and sagittal angles measured based on standing long-cassette-X-rays: thoracic major (MC), proximal thoracic (PC) and lumbar curve (LC), TK, lumbar lordosis (LL). Statistical analysis: values as mean ± SD, differences by student’s t-test (significancy a = 0.05), Pearson’s correlation, sub-analysis with sagittal modifier (−, N, +).

Results

A total of 127 AIS could be identified (63% type 1, 37% type 2). Mean FU 32.2 ± 16.6 months, mean age 14 ± 1.5 years. Mean Correction of MC 73 ± 12%, PC 51 ± 17%, LC 69 ± 21% with a significantly better correction of PC in Lenke 2 curves(p < 0.05). On average, TK (FU-preop) decreased by -2.1 ± 12.1°(p < 0.05) in all AIS. Whereas TK in type 1 was unchanged (p = 0.9), TK significantly decreased by − 6.0 ± 12.7°(p < 0.05) in type 2. No significant difference in LL. TK in hypokyphotic cases increased by 9.5 ± 5.5°(p < 0.05), stayed almost unchanged (− 1.4 ± 9.1°,p = 0.2) in normokyphotic, decreased by − 17.2 ± 14.2°(p < 0.05) in hyperkyphotic cases. Only hypokyphotic cases had a moderately strong correlation between correction of LC (r = 0.6) and PC (r = − 0.4) (frontal plane) and change from pre- to postoperative TK (sagittal plane) (r = 0.6). No relevant correlations for normo- and hyperkyphotic AIS. Postoperative hypokyphosis was significantly more often in Lenke 2 (16.3% vs. 2.6%, p < 0.05). Rod diameter (5,5 mm versus 6 mm) had no significant influence.

Conclusion

Significant correction of hypo- and hyperkyphosis can be achieved with posterior spinal fusion (pedicle screw dual rod systems), whereas normokyphotic spines stay unchanged. However, Lenke 2 curves have a significantly higher risk for a postoperative thoracic hypokyphosis.

  相似文献   
429.
Background

Headaches are the most common complaints among pediatric populations. Determining the cause and appropriate treatment for headaches may be challenging and costly, and the impact of headaches on the lives of patients and their families is not well understood.

Objective

A systematic literature review was conducted to examine what PROMs are currently used, and to identify quality of life (QoL) concepts important to children suffering from headaches and any known determinants of QoL.

Methods

Embase, Medline, Web of Science, CINAHL, EBSCOhost, PsychINFO, Cochrane CENTRAL and Google Scholar were searched from their inception through to June 2021. Studies investigating QoL, using a validated outcome measure in pediatric patients with headaches, were included. Relevant studies were identified through title and abstract screening and full text review by two independent reviewers. A citation review of included studies was performed. QoL concepts were extracted from the outcome measures that were used in each study to develop a preliminary conceptual model of QoL in children suffering from headaches. Determinants of QoL were also identified and categorized.

Results

A total of 5421 studies were identified in the search. Title and abstract screening resulted in the exclusion of 5006 studies. Among the 415 studies included for full text review, 56 were eligible for final analysis. A citation review resulted in the addition of five studies. Most studies were conducted in high-income countries and included a patient-sample accordingly (n = 45 studies). Sixteen different PROMs were identified in the included studies, of which the PedsQL was used the most often (n = 38 studies).

The most common health concepts reported were physical functioning (n = 113 items), social and psychological wellbeing (N = 117, n = 91 resp.). Twenty-five unique determinants of QoL were extracted from the included studies.

Conclusion

There is a need for a condition-specific PROM to facilitate the measurement of QoL outcomes in the pediatric headache population. A conceptual model was developed based on the findings from the health concepts. Findings from this review could be used for future qualitative interviews with pediatric patients with headaches to elicit and refine important QoL concepts.

  相似文献   
430.

Background

Protein synthesis is a tightly controlled process, involving a host of translation-initiation factors and microRNA-associated repressors. Variants in the translational regulator EIF2AK2 were first linked to neurodevelopmental-delay phenotypes, followed by their implication in dystonia. Recently, de novo variants in EIF4A2, encoding eukaryotic translation initiation factor 4A isoform 2 (eIF4A2), have been described in pediatric cases with developmental delay and intellectual disability.

Objective

We sought to characterize the role of EIF4A2 variants in dystonic conditions.

Methods

We undertook an unbiased search for likely deleterious variants in mutation-constrained genes among 1100 families studied with dystonia. Independent cohorts were screened for EIF4A2 variants. Western blotting and immunocytochemical studies were performed in patient-derived fibroblasts.

Results

We report the discovery of a novel heterozygous EIF4A2 frameshift deletion (c.896_897del) in seven patients from two unrelated families. The disease was characterized by adolescence- to adulthood-onset dystonia with tremor. In patient-derived fibroblasts, eIF4A2 production amounted to only 50% of the normal quantity. Reduction of eIF4A2 was associated with abnormally increased levels of IMP1, a target of Ccr4-Not, the complex that interacts with eIF4A2 to mediate microRNA-dependent translational repression. By complementing the analyses with fibroblasts bearing EIF4A2 biallelic mutations, we established a correlation between IMP1 expression alterations and eIF4A2 functional dosage. Moreover, eIF4A2 and Ccr4-Not displayed significantly diminished colocalization in dystonia patient cells. Review of international databases identified EIF4A2 deletion variants (c.470_472del, c.1144_1145del) in another two dystonia-affected pedigrees.

Conclusions

Our findings demonstrate that EIF4A2 haploinsufficiency underlies a previously unrecognized dominant dystonia-tremor syndrome. The data imply that translational deregulation is more broadly linked to both early neurodevelopmental phenotypes and later-onset dystonic conditions. © 2023 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.  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