Object permanence in rhesus monkeys (Macaca mulatta).

We evaluated the performance of 6 adult rhesus monkeys (Macaca mulatta) on object permanence tasks. In Experiment 1, monkeys received search tasks that correspond to Stages 4, 5, and 6 of object permanence. Subjects were successful on tasks of visible displacements (Stages 4 and 5) but failed to find the object in invisible displacements (Stage 6). The monkeys adopted a search strategy of investigating a specific hiding location. In Experiment 2, monkeys were given a second opportunity to find the object if they investigated a location that was part of the displacement on their first search. Subjects relied on the same search strategy identified in Experiment 1. In Experiment 3, the experimenter hid the object in her hand rather than a container. The monkeys failed to recover the object, and individual differences were found in the strategies used. These results suggest that the upper limit of object permanence in rhesus monkeys is Stage 5. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Lipoprotein composition in the insulin-deficient non-acidotic phase of type I diabetic patients and early evolution after the start of insulin therapy

Lipoproteins, including intermediate density lipoproteins and lipoprotein(a), and apolipoproteins A-I, B, C-II, C-III and E, were studied in 13 newly-diagnosed type I diabetic patients with severe insulinopenia without dehydration or acidosis. At baseline, the main finding was a significant increase in serum triglycerides due to raised triglyceride concentrations in all lipoproteins, particularly triglyceride-rich lipoproteins. Cholesterol concentrations were slightly increased in lipoproteins and led to a significant increase in serum cholesterol. Two days after the start of insulin therapy, lipoprotein profiles had normalized except for the LDL triglyceride contents, which remained significantly increased on the fifth day of treatment. No significant modifications were observed in lipoprotein(a), apolipoproteins A-I and E concentrations throughout the study. However, serum apolipoproteins B, C-II and C-III were increased at baseline and fell to normal levels 2 days after the start of insulin therapy. On the other hand, apolipoprotein C-II/C-III ratios in high and very low density lipoprotein, showed no significant differences at baseline compared with controls, suggesting that an apolipoprotein C-II deficiency or apolipoproteins Cs imbalance can be ruled out. In conclusion, significant lipoprotein abnormalities were observed in the insulin-deficient state of type I diabetes mellitus; insulin therapy normalizes the lipoprotein profile in two days, except for low density lipoprotein triglyceride contents which remain increased at the fifth day.     

Longitudinal relations among parental emotional expressivity, children's regulation, and quality of socioemotional functioning.

The role of regulation as a mediator of the relations between maternal emotional expressivity and children's adjustment and social competence was examined when children (N=208) were 4.5 to just 8 years old (Time 1, T1) and 2 years later (Time 2, T2). At T2, as at T1, regulation mediated the relation between positive maternal emotional expressivity and children's functioning. When T1 relations and the stability of variables over time were controlled for in a structural equation model, T2 relations generally were nonsignificant, although parents' dominant negative expressivity predicted high regulation. In contrast, in regressions, the findings for parent positive expressivity, but not negative expressivity, held at T2 when T1 variables were controlled. Thus, relations for negative expressivity, but not positive expressivity, changed with age. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Alcohol use and type of life events experienced during adolescence.

Measured the incidence of stressful life events among 119 adolescents who had an alcohol abusing parent, were in treatment for alcohol/drug abuse, or had no personal or family history of alcohol abuse. Group scores were compared for 7 types of life events based on the Life Event Checklist (LEC) of M. D. Newcomb et al (see record 1982-20103-001). Adolescents in treatment experienced more deviance and emotional distress events whereas adolescents with an alcoholic parent reported significantly more family-related problems. Results provide evidence for the usefulness of the LEC in clinical populations of adolescents. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The cocurrent downflow contactor–a novel reactor for gas-liquid-solid catalysed reactions

The Cocurrent Downflow Contactor (CDC) has been developed as a mass transfer and reactor device, with and without addition of tangential (swirl) flow, giving gas hold-up (E_g) values of 0.5–0.75, interfacial areas in the range 1000–6000 m²m^?3 liquid and k_La values in the range of 0.15–1.55 s^?1 for absorption using the O₂/H₂O system. It has been studied as a catalytic slurry reactor for the hydrogenation of (i) itaconic acid and (ii) triglycerides catalysed by Pd and Ni catalysts. The reactions were observed to be largely surface-reaction rate controlled, due to the very efficient mass transfer (k_La up to 11.75 s^?1 under reaction conditions) and application of swirl flow-enhanced reaction rates. The CDC has recently been found to be capable of operating as a fixed bed reactor, thus eliminating a downstream catalyst separation problem (therefore more cost effective), and is superior in its mass transfer characteristics to other known devices. Scale-up can be undertaken without loss of performance efficiency.     

Infants' perception of musical relations in short transposed tone sequences.

Tested 104 infants (aged 7–11 mo) for their detection of a frequency relational change of 1 semitone in a 5-note melody. In Exp I, Ss were able to discriminate contrasting melodies that differed from the background melodies by 1 semitone. In Exp II, Ss detected a semitone difference more easily when the major triad was background and a relatively uncommon triad, the augmented triad, was the contrast. In Exp III, Ss discriminated the major and minor backgrounds used in Exps I and II from contrasting variations, called inversions, that did not differ in triad quality. Results indicate that infants can respond to precise relations between the component tones of a melody based on familiar or stable structures. Findings also imply that sets of tones that are unfamiliar or unstable may present encoding or memory difficulties for infants, as has been found for children and adults. (French abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Differential processing of in-group and out-group information.

People have a more differentiated cognitive representation of in-groups than of out-groups. This has led to the prediction that memory should be better for in-group information than for out-group information. However, past research has provided equivocal support for that prediction. This article advances a differential processing hypothesis that offers a solution to this paradox. The hypothesis suggests that whereas in-group information is organized by person categories, out-group information is organized through attribute categories. In-group membership alters the categorical basis of memory for person information, but these categories are not necessarily superior to the attribute categories that are used to organize out-group information. That is, both person and attribute categories elicit equal amounts of recall for the in-group and the out-group. Three experiments are reported that support the differential processing hypothesis. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Control of the morphology of waterborne nanocomposite films

Nanocomposite materials are prepared by drying a mixed colloidal suspension of film‐forming latex and silica. The dispersion state of the silica particles in the dry film controls the properties. We describe, with the help of some examples, how the colloidal stability of the particles in the mixed suspension dictates the final morphology of the dry film. Next, some recent work aimed at controlling the morphology by means of formulation additives is described. Such additives are either surfactants or polymer dispersants (block copolymers) which stabilize the particles (latex and/or silica) in the drying suspension. As a result of the mixing‐and‐drying preparation process, suitable additives are necessarily different from the conventional dispersants used in the formulation of composites prepared by means of melt‐processing. Copyright © 2004 Society of Chemical Industry     

Extraction methods and some physical properties of mesquite (Prosopis chilensis (Mol) Stuntz) seed gum

To evaluate the potential use of mesquite (Prosopis chilensis (Mol) Stuntz) seed gum, the behaviour of the gum was studied using two extraction methods (alkaline and acid), different pH values, two concentrations (0.2 and 0.4% w/v) and different temperatures. The capacity of the gum to stabilise food foams was also evaluated. The alkaline extraction yield (24.9%) was higher than the acid extraction yield (17.7%). Owing molecular to hydrolysis caused by the acid, acid extraction resulted in a lower protein content. Gum from acid extraction had a higher viscosity than that from alkaline extraction at all temperatures investigated (10, 20, 30, 40, 50 and 60 °C). There were no significant differences between the viscosities of mucilage dispersions at the different values of pH studied (3.0, 4.0 and 5.0). The addition of extracted mesquite gum (obtained by either method and at either concentration studied) to egg white foam provided a higher stability and decreased the liquid drainage and collapse of the foam. Copyright © 2004 Society of Chemical Industry