University of Arkansas

About: University of Arkansas is a education organization based out in Fayetteville, Arkansas, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 17225 authors who have published 33329 publications receiving 941102 citations. The organization is also known as: Arkansas & UA.

Antioxidant systems in insects

Abstract: Insects possess a suite of antioxidant enzymes and small molecular weight antioxidants that may form a concatenated response to an onslaught of dietary and endogenously produced oxidants. Antioxidant enzymes such as superoxide dismutase, catalase, glutathione transferase, and glutathione reductase have been characterized in insects. Water-soluble and lipid-soluble antioxidants such as ascorbate, glutathione, tocopherols, and carotenoids have not been well studied in insects but may play very important antioxidant roles. Additionally, the peritrophic matrix and trehalose may possess important antioxidant functions in insects. The enzymatic recycling of ascorbate, first noted in green plants, may also exist in insects. A greater understanding of these antioxidant systems may provide greater understanding about the ecological relationships of insects with their hosts.

Surface-Related Emission in Highly Luminescent CdSe Quantum Dots

Abstract: We report our experimental studies of surface-related emission in highly luminescent CdSe quantum dots (QDs) with controlled quantum yield and photooxidation by time-resolved photoluminescence measurements. This kind of surface-related emission, with a radiative lifetime of tens of nanoseconds, implies the involvement of surface states in the carrier recombination process of such highly luminescent CdSe QDs.

Unified Theory of Acceptance and Use of Technology: U.S. Vs. China

Abstract: This paper seeks to enrich our understanding of research on technology adoption by examining a potential boundary condition, related to culture, of the fairly recently developed model of technology adoption and use-i.e., unified theory of acceptance and use of technology (UTAUT). Based on the cultural differences between the U.S. and China, we outline the similarities and dissimilarities between the hypotheses specified in the original UTAUT, which was validated in the U.S., and how the relationships will play in the context of employees in China. We conducted an empirical study in a single organization that operated both in the U.S. and China and collected longitudinal data from a total of over 300 employees in one business unit in each of the two countries. Our study confirmed our hypotheses that social influence will be more uniformly important across all employees, without contingencies related to gender, age and volunatariness that were found to be the case in the U.S. As we theorized, other ...

A Mixed Methods Investigation of Mixed Methods Sampling Designs in Social and Health Science Research

Abstract: A sequential design utilizing identical samples was used to classify mixed methods studies via a two-dimensional model, wherein sampling designs were grouped according to the time orientation of ea...

Predicting Collaboration Technology Use: Integrating Technology Adoption and Collaboration Research

Abstract: The paper presents a model integrating theories from collaboration research (i.e., social presence theory, channel expansion theory, and the task closure model) with a recent theory from technology adoption research (i.e., unified theory of acceptance and use of technology, abbreviated to UTAUT) to explain the adoption and use of collaboration technology. We theorize that collaboration technology characteristics, individual and group characteristics, task characteristics, and situational characteristics are predictors of performance expectancy, effort expectancy, social influence, and facilitating conditions in UTAUT. We further theorize that the UTAUT constructs, in concert with gender, age, and experience, predict intention to use a collaboration technology, which in turn predicts use. We conducted two field studies in Finland among (1) 349 short message service (SMS) users and (2) 447 employees who were potential users of a new collaboration technology in an organization. Our model was supported in both studies. The current work contributes to research by developing and testing a technology-specific model of adoption in the collaboration context.