5,642 research outputs found

    Augmenting the 6-3-5 method with design information

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    This paper describes a comparative study between the 6-3-5 Method and the ICR Grid. The ICR Grid is an evolved variant of 6-3-5 intended to better integrate information into the concept generation process. Unlike a conventional 6-3-5 process where participants continually sketch concepts, using the ICR Grid (the name derived from its Inform, Create, Reflect activities and structured, grid-like output) participants are additionally required to undertake information search tasks, use specific information items for concept development, and reflect on the merit of concepts as the session progresses. The results indicate that although the quantity of concepts was lower, the use of information had a positive effect in a number of areas, principally the quality and variety of output. Although grounded in the area of product development, this research is applicable to any organisation undertaking idea generation and problem solving. As well as providing insights on the transference of information to concepts, it holds additional interest for studies on the composition and use of digital libraries

    Stability and sensitivity of water T2 obtained with IDEAL-CPMG in healthy and fat-infiltrated skeletal muscle

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    Quantifying muscle water T2 (T2 -water) independently of intramuscular fat content is essential in establishing T2 -water as an outcome measure for imminent new therapy trials in neuromuscular diseases. IDEAL-CPMG combines chemical shift fat-water separation with T2 relaxometry to obtain such a measure. Here we evaluate the reproducibility and B1 sensitivity of IDEAL-CPMG T2 -water and fat fraction (f.f.) values in healthy subjects, and demonstrate the potential of the method to quantify T2 -water variation in diseased muscle displaying varying degrees of fatty infiltration. The calf muscles of 11 healthy individuals (40.5 ± 10.2 years) were scanned twice at 3 T with an inter-scan interval of 4 weeks using IDEAL-CPMG, and 12 patients with hypokalemic periodic paralysis (HypoPP) (42.3 ± 11.5 years) were also imaged. An exponential was fitted to the signal decay of the separated water and fat components to determine T2 -water and the fat signal amplitude muscle regions manually segmented. Overall mean calf-level muscle T2 -water in healthy subjects was 31.2 ± 2.0 ms, without significant inter-muscle differences (p = 0.37). Inter-subject and inter-scan coefficients of variation were 5.7% and 3.2% respectively for T2 -water and 41.1% and 15.4% for f.f. Bland-Altman mean bias and ±95% coefficients of repeatability were for T2 -water (0.15, -2.65, 2.95) ms and f.f. (-0.02, -1.99, 2.03)%. There was no relationship between T2 -water (ρ = 0.16, p = 0.07) or f.f. (ρ = 0.03, p = 0.7761) and B1 error or any correlation between T2 -water and f.f. in the healthy subjects (ρ = 0.07, p = 0.40). In HypoPP there was a measurable relationship between T2 -water and f.f. (ρ = 0.59, p < 0.001). IDEAL-CPMG provides a feasible way to quantify T2 -water in muscle that is reproducible and sensitive to meaningful physiological changes without post hoc modeling of the fat contribution. In patients, IDEAL-CPMG measured elevations in T2 -water and f.f. while showing a weak relationship between these parameters, thus showing promise as a practical means of quantifying muscle water in patient populations

    The Precursors and Products of Justice Climates: Group Leader Antecedents and Employee Attitudinal Consequences

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    Drawing on the organizational justice, organizational climate, leadership and personality, and social comparison theory literatures, we develop hypotheses about the effects of leader personality on the development of three types of justice climates (e.g., procedural, interpersonal, and informational), and the moderating effects of these climates on individual level justice- attitude relationships. Largely consistent with the theoretically-derived hypotheses, the results showed that leader (a) agreeableness was positively related to procedural, interpersonal and informational justice climates, (b) conscientiousness was positively related to a procedural justice climate, and (c) neuroticism was negatively related to all three types of justice climates. Further, consistent with social comparison theory, multilevel data analyses revealed that the relationship between individual justice perceptions and job attitudes (e.g., job satisfaction, commitment) was moderated by justice climate such that the relationships were stronger when justice climate was high

    Epidemiology of Eales Disease in the Central Western India

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    Objective: To investigate the clinical features and propose a new staging system based on the clinicopathological correlation and formulate new guidelines for management of Eales’ disease in healthy young males. Design: Prospective cohort study. Setting: Vitreo Retinal Department of a tertiary eye care center in Western Central India. Participants: Seventy-four eyes diagnosed with Eales’ disease. Materials and methods: From 2004 to 2010, patients clinically diagnosed with Eales’ disease were enrolled in this study using specific inclusion and exclusion criteria. We examined the patients’ anterior and posterior segments thoroughly. We performed the necessary ocular and systemic investigations. We divided the investigations into three stages: inflammatory, ischemic and complications and the patients were treated accordingly. We treated the patients using medical management, photocoagulation or pars plana vitrectomy. The patients were monitored according to standard schedules and formats. All information was documented using a pre-tested online format and statistical analyses were performed using SPSS ver. 17. A p-value < 0.05 was considered to indicate significance. Outcome measures: Visual acuity. Results: The cohort comprised 74 cases with a mean age of 30 ± 8.73 years. The visual acuity of the presenting cohort was < 3/60 in 64.9% of eyes. The final visual outcome was > 6/12 in 40 eyes (54.1%), 6/60 to 6/18 in 14 eyes (18.9%) and < 1/60 in the remaining 9 eyes at a mean follow-up of 592 days. The visual parameters differed significantly pre-and post-treatment. We evaluated the visual outcome following surgical management. Conclusion: We studied epidemiological facts about anterior and posterior segment findings

    International Veterinary Epilepsy Task Force recommendations for a veterinary epilepsy-specific MRI protocol

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    Epilepsy is one of the most common chronic neurological diseases in veterinary practice. Magnetic resonance imaging (MRI) is regarded as an important diagnostic test to reach the diagnosis of idiopathic epilepsy. However, given that the diagnosis requires the exclusion of other differentials for seizures, the parameters for MRI examination should allow the detection of subtle lesions which may not be obvious with existing techniques. In addition, there are several differentials for idiopathic epilepsy in humans, for example some focal cortical dysplasias, which may only apparent with special sequences, imaging planes and/or particular techniques used in performing the MRI scan. As a result, there is a need to standardize MRI examination in veterinary patients with techniques that reliably diagnose subtle lesions, identify post-seizure changes, and which will allow for future identification of underlying causes of seizures not yet apparent in the veterinary literature. There is a need for a standardized veterinary epilepsy-specific MRI protocol which will facilitate more detailed examination of areas susceptible to generating and perpetuating seizures, is cost efficient, simple to perform and can be adapted for both low and high field scanners. Standardisation of imaging will improve clinical communication and uniformity of case definition between research studies. A 6–7 sequence epilepsy-specific MRI protocol for veterinary patients is proposed and further advanced MR and functional imaging is reviewed

    BCR-ABL1 mutation development during first-line treatment with dasatinib or imatinib for chronic myeloid leukemia in chronic phase

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    BCR-ABL1 mutations are a common, well-characterized mechanism of resistance to imatinib as first-line treatment of chronic myeloid leukemia in chronic phase (CML-CP). Less is known about mutation development during first-line treatment with dasatinib and nilotinib, despite increased use because of higher response rates compared with imatinib. Retrospective analyses were conducted to characterize mutation development in patients with newly diagnosed CML-CP treated with dasatinib (n=259) or imatinib (n=260) in DASISION (Dasatinib versus Imatinib Study in Treatment-Naive CML-CP), with 3-year minimum follow-up. Mutation screening, including patients who discontinued treatment and patients who had a clinically relevant on-treatment event (no confirmed complete cytogenetic response (cCCyR) and no major molecular response (MMR) within 12 months; fivefold increase in BCR-ABL1 with loss of MMR; loss of CCyR), yielded a small number of patients with mutations (dasatinib, n=17; imatinib, n=18). Dasatinib patients had a narrower spectrum of mutations (4 vs 12 sites for dasatinib vs imatinib), fewer phosphate-binding loop mutations (1 vs 9 mutations), fewer multiple mutations (1 vs 6 patients) and greater occurrence of T315I (11 vs 0 patients). This trial was registered at www.clinicaltrials.gov as NCT00481247.T P Hughes, G Saglio, A Quintás-Cardama, M J Mauro, D-W Kim, J H Lipton6, M B Bradley-Garelik, J Ukropec and A Hochhau

    Clinical characterisation of cardiac involvement in Anderson-Fabry Disease

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    Background: Anderson – Fabry Disease (AFD) is an X-linked lysosomal storage disorder that results in a deficiency in lysosomal α-galactosidase A. This leads to an accumulation of glycosphingolipids in multiple cell types resulting in the characteristic angiokeratomata, acroparesthesiae, hypohidrosis, and corneal opacities of classical AFD. Although patients with AFD have a reduced life span, the pathogenesis and impact of cardiac involvement on prognosis remain unclear. The aim of this thesis was to clinically characterise cardiac involvement in AFD using a systematic cardiac assessment of a consecutive cohort of patients with AFD. / Methods: A cardiac assessment protocol including history and examination, 12 lead ECG, 24 hour ambulatory ECG monitoring, echocardiography and cardiopulmonary exercise testing were performed in a cohort of 122 consecutive patients. Subgroups had coronary flow reserve and evaluation of serum levels of MMP-9, TIMP-1 and TIMP-2 to assess coronary microvascular function and extracellular matrix (ECM) turnover, respectively. / Results: The main results of the thesis are as follows: (1) Tachy and brady arrhythmias are common and may contribute to premature death; (2) Left ventricular systolic impairment is common and decline in systolic function may represent a measure of disease severity; (3) objective evidence for exercise limitation is common and is related to overall disease severity as assessed with a validated disease severity score; (4) patients with AFD have markedly abnormal coronary microvascular function which does not improve with ERT; (5) patients with AFD have abnormal ECM turnover associated with overall disease severity. / Conclusion: Patients with AFD related cardiomyopathy have progressive disease characterised by heart failure and arrhythmia. It is likely that myocardial ischaemia and abnormal interstitial turnover are related in the pathogenesis of cardiac disease and complications. Patients with AFD need regular and continued cardiac follow up for early identification and treatment of cardiac complications

    A comprehensive 1000 Genomes-based genome-wide association meta-analysis of coronary artery disease

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    Existing knowledge of genetic variants affecting risk of coronary artery disease (CAD) is largely based on genome-wide association studies (GWAS) analysis of common SNPs. Leveraging phased haplotypes from the 1000 Genomes Project, we report a GWAS meta-analysis of 185 thousand CAD cases and controls, interrogating 6.7 million common (MAF>0.05) as well as 2.7 million low frequency (0.005<MAF<0.05) variants. In addition to confirmation of most known CAD loci, we identified 10 novel loci, eight additive and two recessive, that contain candidate genes that newly implicate biological processes in vessel walls. We observed intra-locus allelic heterogeneity but little evidence of low frequency variants with larger effects and no evidence of synthetic association. Our analysis provides a comprehensive survey of the fine genetic architecture of CAD showing that genetic susceptibility to this common disease is largely determined by common SNPs of small effect siz
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