University of North Texas

About: University of North Texas is a education organization based out in Denton, Texas, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 11866 authors who have published 26984 publications receiving 705376 citations. The organization is also known as: Fight, North Texas & UNT.

Reduced Hippocampal Functional Connectivity in Alzheimer Disease

Abstract: Objective To determine if functional connectivity of the hippocampus is reduced in patients with Alzheimer disease. Design Functional connectivity magnetic resonance imaging was used to investigate coherence in the magnetic resonance signal between the hippocampus and all other regions of the brain. Participants Eight patients with probable Alzheimer disease and 8 healthy volunteers. Results Control subjects showed hippocampal functional connectivity with diffuse cortical, subcortical, and cerebellar sites, while patients demonstrated markedly reduced functional connectivity, including an absence of connectivity with the frontal lobes. Conclusion These findings suggest a functional disconnection between the hippocampus and other brain regions in patients with Alzheimer disease.

Testing a Four-Factor Model of Psychopathy and Its Association With Ethnicity, Gender, Intelligence, and Violence.

Abstract: Although a 2-factor model has advanced research on the psychopathy construct, a 3-factor model was recently developed that emphasized pathological personality and eliminated antisocial behavior. However, dropping antisocial behavior from the psychopathy construct may not be advantageous. Using a large sample of psychiatric patients from the MacArthur Risk Assessment Study (J. Monahan & H. J. Steadman, 1994), the authors used confirmatory factor analysis to test a 4-factor model of psychopathy, which included interpersonal, affective, and behavioral impulsivity dimensions and an antisocial behavior dimension. Model fit was good for this 4-factor model, even when ethnicity, gender, and intelligence variables were included in the model. Structural equation modeling was used to compare the 3- and 4-factor models in predicting proximal (violence) and distal (intelligence) correlates of psychopathy.

Toward an integrated framework for online consumer behavior and decision making process: A review

Abstract: This paper presents a comprehensive review of recent empirical studies dealing with online consumer behavior and decision-making processes. To that end, the paper adapts and extends Engel, Kollat, and Blackwell's (1978) and Engel, Blackwell, and Miniard's (1986) decision-making model as backdrop in the review of the literature. The vast majority of studies examine the link between external factors and one or more components of the decision-making process. The findings of this study show a paucity of research on a number of components of decision making, as well as inconsistencies in the way the online environment is characterized. Finally, the findings show that student samples are prevalent among the studies identified and the research method is biased toward the survey method as opposed to experimentation. Discussion and conclusions are provided, and directions for future research are presented. ©2010 Wiley Periodicals, Inc.

Facile, scalable synthesis of edge-halogenated graphene nanoplatelets as efficient metal-free eletrocatalysts for oxygen reduction reaction

Abstract: A series of edge-selectively halogenated (X 5 Cl, Br, I) graphene nanoplatelets (XGnPs 5 ClGnP, BrGnP, IGnP) were prepared simply by ball-milling graphite in the presence of Cl2 ,B r 2 and I2, respectively. High BET surface areas of 471, 579 and 662 m 2 /g were observed for ClGnP, BrGnP and IGnP, respectively, indicating a significant extent of delamination during the ball-milling and subsequent workup processes. The newly-developed XGnPs can be well dispersed in various solvents, and hence are solution processable. Furthermore, XGnPs showed remarkable electrocatalytic activities toward oxygen reduction reaction (ORR) with a high selectivity, good tolerance to methanol crossover/CO poisoning effects, and excellent long-term cycle stability. First-principle density-functional calculations revealed that halogenated graphene edges could provide decent adsorption sites for oxygen molecules, in a good agreement with the experimental observations.