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.

The design and effects of control systems: tests of direct- and indirect-effects models

Abstract: Two models are developed on the effects of a control system that include participative standard setting, standard-based incentives, and standard tightness. The direct model proposes that the control system directly affects performance, whereas the indirect model proposes that the effects of the control system on performance are indirect through the mediating influence of job-related stress. Hypothesis tests and a models-comparison test using structural equation modeling indicate that the indirect model has a significantly better fit to the data than does the direct model.

ACTIVATION CROSS SECTIONS FOR 14.8-Mev NEUTRONS AND SOME NEW RADIOACTIVE NUCLIDES IN THE RARE EARTH REGION

Abstract: Activation cross sections on 27 stable nuclides of elements Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Er, Yb, and Lu were measured for 14.8\ifmmode\pm\else\textpm\fi{}0.8-Mev neutrons. Highly enriched isotopes were used as targets in most cases, and in a few instances radiochemical separations were performed whenever it was necessary and possible in view of the product half-lives. The measured cross sections for ($n, 2n$) reactions were found to agree within an order of magnitude with predictions from statistical evaporation theory. However, experimental values of ($n, p$) and ($n, \ensuremath{\alpha}$) cross sections generally appear to be larger than calculated from continuum theory of the compound nucleus. The cross sections show no significant effects due to the 82-neutron closed shell and, furthermore, the Levkovskii effect, which is quite striking in the low $Z$ region, appears to be negligible for ($n, p$) and ($n, \ensuremath{\alpha}$) reactions in the rare earth region. The ($n, 2n$) cross sections show little variation with mass number at constant $Z$, and they exhibit a decrease with increasing mass number at $N=82$.Several previously unreported activities were observed; their half-lives, assignment, and gamma radiations are as follows: 12\ifmmode\pm\else\textpm\fi{}3 min ${\mathrm{Pr}}^{148}$ from the ${\mathrm{Nd}}^{148}(n, p)$ reaction; 0.5\ifmmode\pm\else\textpm\fi{}0.1 min ${\mathrm{Sm}}^{157}$ from the ${\mathrm{Gd}}^{160}(n, \ensuremath{\alpha})$ reaction, 0.57\ifmmode\pm\else\textpm\fi{}0.01 Mev gamma; 7\ifmmode\pm\else\textpm\fi{}1 min ${\mathrm{Tb}}^{163}$ from the ${\mathrm{Dy}}^{163}(n, p)$ reaction, 0.18\ifmmode\pm\else\textpm\fi{}0.05-Mev gamma; 3.3\ifmmode\pm\else\textpm\fi{}0.5 min ${\mathrm{Ho}}^{168}$ from the ${\mathrm{Er}}^{168}(n, p)$ reaction, 0.85\ifmmode\pm\else\textpm\fi{}0.05-Mev gamma; 40\ifmmode\pm\else\textpm\fi{}10 sec ${\mathrm{Ho}}^{170}$ from the ${\mathrm{Er}}^{170}(n, p)$ reaction; 4.4\ifmmode\pm\else\textpm\fi{}0.4 min ${\mathrm{Dy}}^{167}$ from the ${\mathrm{Er}}^{170}(n, \ensuremath{\alpha})$ reaction; 2.0\ifmmode\pm\else\textpm\fi{}0.5 min activity with gammas at 0.18\ifmmode\pm\else\textpm\fi{}0.01, 0.25\ifmmode\pm\else\textpm\fi{}0.01, and 0.36\ifmmode\pm\else\textpm\fi{}0.01 Mev which may be ${\mathrm{Tm}}^{176}$, ${\mathrm{Er}}^{173}$, or possibly isomeric ${\mathrm{Yb}}^{177m}$ from enriched ${\mathrm{Yb}}^{176}$ bombardments. Tentative assignment of a 5.5\ifmmode\pm\else\textpm\fi{}0.5-min activity to ${\mathrm{Tm}}^{174}$ is suggested from bombardment of enriched ${\mathrm{Yb}}^{174}$.

Forums for MIS scholars

Abstract: W here should I publish my scholarly research? is a question often heard in academic circles. On the surface this appears to be a trivial question. However, when one considers the vast number of journals available, the pressure on faculty to publish, and the impact of publishing on promotion and tenure, the question no longer seems trivial. As early as 1983, Hamilton and Ives [6] noted that the abundance of journals and long publication lead times made it important to identify journal quality so researchers know where to submit their work. Many parties other than MIS faculty have an interest in the quality ratings of MIS publication outlets: (1) selection, promotion, and tenure committees seeking to secure and retain the best faculty [3, 7]; (2) journal editors and associates seeking to raise the quality of their journals [12]; (3) students of the discipline seeking to gain an understanding of the field [6, 11]; (4) members of the MIS field as it continues to mature as a discipline [6, 11]; and (5) librarians seeking to invest wisely their ever-decreasing funds [12]. Overall, the determination of journal quality helps to further the MIS discipline. Several studies have evaluated the quality of MIS publication outlets. However, as Gillenson and Stutz [5] note: “earlier studies addressed the issue of MIS journals in a variety of ways, no two quite the same.” An assortment of methods has been used to assess journal quality. Some have used a numeric scale to assign ratings to various journals [5, 6, 12]. Others have asked respondents to rank the journals in some fashion [3, 7]. Most of the studies asked a crosssection of MIS faculty to evaluate the journals [3, 6, 7, 12]; although at least one polled specific members of the MIS faculty such as department chairs or senior faculty [5]. The only thing these studies have in common is that they all attempt to do the same thing—identify the quality of journals. The study described in this article is a follow-up and update to the 1991 study by Walstrom et al. [12], using the same population and data collection instrument; thus allowing a direct comparison to be made between the findings in this study and those of the 1991 study. MIS faculty in the U.S. and Canada were asked to rate 53 journals according to their appropriateness as publication outlets and 11 conferences according to their value to the MIS field. Over 350 responses were received—by far the largest sample for this type of

Determination of acetaminophen-protein adducts in mouse liver and serum and human serum after hepatotoxic doses of acetaminophen using high-performance liquid chromatography with electrochemical detection

Abstract: Acetaminophen-induced hepatotoxicity has been attributed to covalent binding of the reactive metabolite N-acetyl-p-benzoquinone imine to cysteine groups on proteins as an acetaminophen-cysteine conjugate. We report a high-performance liquid chromatography with electrochemical detection (HPLC-ECD) assay for the conjugate with increased sensitivity compared with previous methods. Previous methods to quantitate the protein-bound conjugate have used a competitive immunoassay or radiolabeled acetaminophen. With HPLC-ECD, the protein samples are dialyzed and then digested with protease. The acetaminophen-cysteine conjugate is then quantified by HPLC-ECD using tyrosine as an internal reference. The lower limit of detection of the assay is approximately 3 pmol/mg of protein. Acetaminophen protein adducts were detected in liver and serum as early as 15 min after hepatotoxic dosing of acetaminophen to mice. Adducts were also detected in the serum of acetaminophen overdose patients. Analysis of human serum samples for the acetaminophen-cysteine conjugate revealed a positive correlation between acetaminophen-cysteine conjugate concentration and serum aspartate aminotransferase (AST) activity or time. Adducts were detected in the serum of patients even with relatively mild liver injury, as measured by AST and alanine aminotransferase. This assay may be useful in the diagnostic evaluation of patients with hepatotoxicity of an indeterminate etiology for which acetaminophen toxicity is suspect.

Use of the ideal protein concept for precision formulation of amino acid levels in broiler diets

Abstract: Ideal amino acid ratios for chicks during the early growth period (0 to 21 days) are well documented by empirical evidence, but suggested ratios for older birds are in need of confirmation. Based on best empirical estimates of lysine, SAA, and threonine requirements of broiler chicks during 0 to 21, 21 to 42, and 42 to 56 days of age, together with new knowledge of maintenance contributions to the total requirement for these amino acids, it appear that the ideal ratio of SAA and threonine to lysine may change very little as birds advance in age and weight toward a 56-day market weight. This paper presents regression equations that predict both digestible and total lysine, SAA, and threonine requirements at any age or weight between hatching and 56 days.