Self-blocking of dislocations in intermetallic compound Ni<Subscript>3</Subscript>Ge: Cubic slip

Self-blocking of dislocations belonging to the cube plane has been detected in the intermetallic compound Ni₃Ge. The nature of cubic slip has been clarified. The experiments included deformation at a temperature above T _max (the temperature of the yield-stress peak) and subsequent heating without stress. In addition, changes in the dislocation structure upon slow cooling from the temperature of the preliminary deformation have been investigated; in doing so, self-blocking of dislocations has been revealed for the first time. Based on the totality of experimental data, a conclusion has been made on the two-valley potential relief for a dislocation motion in the cube plane. It is the difference in the depths between the Peierls valley (a diffuse core in the cube plane) and the deepest valley (a superpartial dislocation split in the octahedron plane) that provides for the driving force of self-blocking in the absence of an external stress. Different aspects of cubic slip have been considered: the disappearance of cubic slip at T < T _max and, correspondingly, the nonobservation of an anomalous behavior of the yield stress, as well as the disappearance of octahedral slip at T > T _max.     

The crying infant

The crying infant is a common presenting complaint and a difficult diagnostic dilemma that may represent the primary manifestation of a serious or even life-threatening condition. Although many children experience an exacerbation of the normal crying tendencies or minor ailments typical of the early months of life, a significant number of infants have underlying pathologic conditions requiring immediate intervention. This article briefly reviews current and past research on this phenomenon and presents differential diagnoses and recommendations for the evaluation and management of the acute crying episode.     

Enzymatic synthesis of monosaccharide fatty acid esters and their comparison with conventional products

5-O-Acyl-1,2-O-isopropylidene-D-xylofuranose and 6-O-acyl1,2∶3,4-di-O-isopropylidene-D-galactopyranose were enzymatically prepared from the corresponding monosaccharide acetals and commercial (crude) fatty acid mixtures. Subsequent acid-catalyzed hydrolysis of the isopropylidene group(s) gave monosaccharide esters with overall yields of 59–88%, where the monoester content was at least 80% (galactose oleate) and typically 90% for the other preparations. In contrast to sugar fatty acid esters prepared by conventional, high-temperature (trans)esterification, the enzymatically obtained monosaccharide esters contained no appreciable quantities of undersirable side products, and the only contaminants were monosaccharides and fatty acids.     

Reply to Mahrer.

Replies to Mahrer's response (see record 2007-09057-001) to the current author's book review (see record 2007-09053-001). Mahrer raises some important questions and submits that different approaches differ significantly in the categories they use to make sense of what clients do, and that each has its own way of eliciting, listening to and observing what the client says and does. I agree that approaches differ on these features and believe that what we listen for and how we make sense of what we hear is the most fundamental aspect of any therapeutic approach. In fact training in an approach involves not only learning the intervention skills of the approach, which is the easy part, but learning when and how to use the intervention, which is based on listening and process diagnosis. (PsycINFO Database Record (c) 2010 APA, all rights reserved)