Motion picture study of the temporal and geometric parameters of ethanol fixation of an isolated neuron

The work has employed a combination of microscopic observation, filming and computer processing of the data obtained. The proper time, rate and latent period of fixation with ethanol of different concentration were analyzed in the isolated surviving neuron. The temporal parameters of fixation were shown to depend on the size of the neuron and the concentration of the fixator. The authors describe the regularities and distinctions in changes of large and small diameters as well as the volumes in vegetative neurons of different size in frog. An attempt has been made to consider the fixation not only as a momentary action but also as a prolonged-in-time complex morphological process.     

Perceptual concommitants of racial attitudes in urban grade-school children.

Investigated children's racial attitudes and their concomitant perceptual responses in a 2-part study. In Phase 1, a total of 400 2nd, 4th and 6th graders at 2 racially integrated urban elementary schools were given a battery of 4 attitude tests (e.g., the Projective Prejudice Test). In Phase 2, a subsample of 96 Ss were classified into high- and low-prejudice groups on the basis of attitude scores and judged the similarity of pictures of facial pairs. Stimuli varied as to color, shade, expression, and hair type. A 4-way factorial design was employed (Grade * Prejudice Level * Race of Subject * Race of Examiner). Findings indicate that the various ways of assessing Ss' racial attitudes were not equivalent. Some instruments were strongly affected by developmental and racial factors, whereas others were not. Correlations between indices were low. Findings in Phase 2 indicated that racial attitudes do have perceptual correlates, particularly for white children. Race-related cues were accentuated by high-prejudice children, whereas non-race-related ones were less salient. (22 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Meta-analysis as a means of discovery.

Comments on M. W. Lipsey and D. B. Wilson's (see record 1994-18340-001) review of meta-analytic assessments of research on psychological treatment effectiveness. Sohn considers the comparative properties of empirical research (typically referred to as primary research) and the literature review as a means of scientific discovery and discusses the way that scientific discovery is made. Sohn described the hypothesis-testing view of science in psychology and argues that psychological researchers need to develop the kind of fundamental (probably biological) knowledge of the organism that will enable researchers to formulate hypotheses that are in touch with basic knowledge. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

PIV study of vortexing during draining from square tanks

The flow field in square tanks with various corner roundings is studied to investigate drain flow characteristics. An attempt is made to understand the mechanism of flow field responsible for vortex suppression by the different radius of rounding at the corner. For this purpose, flow visualization studies using particle image velocimetry are employed to determine the flow patterns in a square tank. Results are obtained for no draining and with draining experiments. The flow field is visualized both in horizontal and vertical planes. The results reveal that the secondary vortices formed at the corners are responsible for vortex suppression.     

Effect of bleeding treatment and perfusion of yellowtail on lipid oxidation in post-mortem muscle

The present study investigated the effects of bleeding treatment and perfusion of antioxidant compounds on lipid oxidation in ordinary and dark muscles of yellowtail in the early stage of ice storage. The lipid hydroperoxide contents of dark muscles obtained from yellowtails with and without bleeding treatment were higher and increased more rapidly than those of ordinary muscles. There were no significant differences in the rates of change of the lipid hydroperoxide content (up to 48 h), fatty acid composition and metmyoglobin formation between dark muscles with and without bleeding treatment. Physiological saline containing ascorbic acid or 6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid (Trolox^®) was perfused into live yellowtail or added to minced dark muscle. Trolox^® significantly (P < 0.01) delayed the accumulation of lipid hydroperoxide in dark muscle compared to ascorbic acid in perfusion experiment. These results indicate that simply removing a portion of the blood from live yellowtail by bleeding is not sufficient to prevent lipid oxidation in the early stage of ice storage. Contrary to this, addition of antioxidants into fish flesh is effective to delay lipid oxidation in post-mortem muscle.     

Effect of CaSO4 Pelletization Conditions on a Novel Process for Converting SO2 to Elemental Sulfur by Reaction Cycles Involving CaSO4/CaS – Part II: Reduction of SO2 with CaS

A new process for converting sulfur dioxide to elemental sulfur by a cyclic process involving calcium sulfide and calcium sulfate without generating secondary pollutants, developed at the University of Utah, was described in Part I of this series. In this process, sulfur dioxide is reacted with calcium sulfide to produce elemental sulfur and calcium sulfate; the latter is reduced by hydrogen to regenerate calcium sulfide. Here, in Part II, the effects of different pelletization conditions for the initial reactant calcium sulfate on the reactivity of CaS pellets produced from calcium sulfate pellets toward sulfur dioxide were studied. Experiments were performed to investigate the effects of temperature in the range 1023–1173 K, pellet size, cycle repetition, and water vapor or carbon dioxide content in the sulfur dioxide stream. The binder amount and the presence of nickel catalyst did not significantly affect the reaction rate.     

An experimental study for chlorine residual and trihalomethane formation with rechlorination.

Maintenance of adequate chlorine residuals and control of disinfection byproducts (DBPs) throughout water distribution systems is currently an important issue. In particular, rechlorination can be a powerful tool in controlling adequate chlorine residual in a large distribution system. The patterns of chlorine decay and formation of DBPs due to rechlorination are different from those of chlorination; chlorine decay is slower and trihalomethane (THM) formation is lower with rechlorination. The present study evaluates whether existing predictive models for chlorine residual and THM formation are applicable in the case of rechlorination. A parallel first-order decay model represents the best simulation results for chlorine decay, and an empirical power function model (modified Amy model) with an introduced correction coefficient (phi1, phi2) is more suitable to THM formation.