Use of cysteine to remove mercury from shark muscle

The efficiency of cysteine to remove mercury from sliced and minced shark was evaluated. Treatment with 0.5% cysteine at pH 2.0–2.5 and subsequent washing with sodium chloride (5%) failed to remove the mercury from the sliced shark. The efficiency of 0.5% cysteine at pH 7.0 in removing mercury from minced shark was 40–45% (dry material), obtained by two of the three methods studied. This removal rate was considered relatively low for it failed to attend to the practical proposal of decontaminating species of fish highly contaminated by mercury. The need for fuller understanding of the mechanisms involved in the removal of mercury by cysteine was also considered.     

Impact of job experience and ability on job knowledge, work sample performance, and supervisory ratings of job performance.

Based on data from 4 independent studies reported by R. Vineberg and E. N. Taylor (1972) with a total sample size of 1,474, path analysis was used to examine the causal impact of job experience on job knowledge, performance capability as measured by job sample tests, and supervisory ratings of job performance. Findings support the conclusion that (1) when mean job experience is 2–3 yrs, there is substantial variance in job experience and (2) when the jobs are of an intermediate complexity level, job experience has a substantial direct impact on job knowledge and a smaller direct impact on performance capabilities as assessed by job sample measures. Job experience also has a substantial indirect effect on work sample performance through its effect on job knowledge, which, in turn, was found to be the strongest determinant of work sample performance. The pattern and magnitude of causal effects of general mental ability were similar to those of job experience. The effect of job knowledge on supervisory ratings was several times stronger than the effect of job sample performance, confirming the findings of J. E. Hunter (1983). When job experience was held constant, the direct impact of ability on the acquisition of job knowledge increased substantially, and this, in turn, increased the indirect effect of ability on job sample performance. (28 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Relating consumer preferences to sensory and physicochemical properties of dry beans (Phaseolus vulgaris)

BACKGROUND: Dry beans (Phaseolus vulgaris) have a range of varieties, colours and sizes. Differences in physicochemical and sensory properties influence consumer choices for beans. This study related consumer preferences to sensory and physico‐chemical properties of selected bean varieties—Jenny, Kranskop, PAN 148, AC Calmont, PAN 150 and Mkuzi—grown in Mpumalanga (MP) and Free State (FS) in South Africa. RESULTS: Significant (P < 0.05) variety, location as well as location × variety interaction effects were found for both physico‐chemical and sensory properties of beans. Jenny‐FS, Mkuzi and PAN 148‐MP beans had relatively long cooking times (>60 min). Some beans (e.g. PAN 150 and Mkuzi beans) were described as bitter, soapy and metallic with a raw‐bean flavour whereas more preferred beans (e.g. Jenny‐MP, Kranskop‐MP) were sweet, soft and with a cooked‐bean flavour. CONCLUSION Apart from small seed size, sensory characteristics such as bitter taste, soapy and metallic mouthfeel and hard texture contributed to consumers' dislike of certain bean varieties. The sweet taste, cooked‐bean flavours, soft and mushy textures of the most accepted varieties seemed to be related to beans with good hydration capacities that facilitated softening during cooking. Copyright © 2007 Society of Chemical Industry     

Determination of the Fe2+/Fe3+ Ratio in Nuclear Waste Glasses

The Fe²⁺/Fe³⁺ ratios of 47 simulated nuclear waste glass samples with ratios varying from 0.01 (oxidized) to 1.6 (reduced) were determined by wet-chemical and Mössbauer spectral analyses. The wet-chemical method involved the spectrophotometric determination of Fe²⁺ and total iron using remote spectroscopy with fiber optic chemical sensing. Interferences from other species present in these glasses were examined and alternative analytical techniques were investigated. Results of wet-chemical and Mössbauer spectral analysis were comparable; however, the wet-chemical method is probably preferable for the analysis of highly radioactive glasses until such glasses have been shown to have satisfactory Mössbauer spectra.     

The Impact of Political Talk Radio Exposure on Attributions About the Outcome of the 1996 U.S. Presidential Election

This study investigates the media's potential to affect audiences' interpretations of news events. It compares perceptions of the causes of the 1996 presidential election outcome across four media consumption groups: listeners to the program of Rush Limbaugh, listeners to other political talk radio, consumers of mainstream news media, and nonconsumers of news media. Limbaugh listeners were more likely to discount substantive election explanations than were consumers of other types of political talk radio, consumers of mainstream news media, and nonconsumers of news media. These differences in interpretation parallel differences between the content of his program and that of other media.     

Unequal-area facility layout by genetic search

This paper applies genetic optimization with an adaptive penalty function to the shape-constrained unequal-area facility layout problem. We implement a genetic search for unequal-area facility layout, and show how optimal solutions are affected by constraints on permitted department shapes, as specified by a maximum allowable aspect ratio for each department. We show how an adaptive penalty function can be used to find good feasible solutions to even the most highly constrained problems. We describe our genetic encoding, reproduction and mutation operators, and penalty evolution strategy. We provide results from several test problems that demonstrate the robustness of this approach across different problems and parameter settings.     

Motor recovery after stroke depends on intact sustained attention: A 2-year follow-up study.

The functional recovery of 47 right-brain-damaged stroke patients was studied over a 2-year period. The researchers hypothesized that sustained attention capacity should predict the degree of motor and functional recovery over this period because of a proposed privileged role of sustained attention in learning-based recovery of function. As predicted, significant correlations were found between sustained attention capacity at 2 months and functional status (including the Barthel Index) at 2 years. This relationship was shown to exist independently of 2-month functional status. Furthermore, compared with a left-brain-damaged group of cerebrovascular accident (CVA) patients, the right-brain CVA group did not recover functional ability as well over the 2-year period. This increasing difference in functional status over a 2-year period was mirrored by an emerging difference in sustained attention capacity, in favor of the left-brain CVA group. (PsycINFO Database Record (c) 2010 APA, all rights reserved)