8 research outputs found
Phase segregation due to simultaneous migration and coalescence
Ground-based modeling and experiments have been performed on the interaction and coalescence of drops leading to macroscopic phase separation. The focus has been on gravity-induced motion, with research also initiated on thermocapillary motion of drops. The drop size distribution initially shifts toward larger drops with time due to coalescence, and then a back towards smaller drops due to the larger preferentially settling out. As a consequence, the phase separation rate initially increases with time and then decreases
Evolutionary Genomics of the HAD Superfamily: Understanding the Structural Adaptations and Catalytic Diversity in a Superfamily of Phosphoesterases and Allied Enzymes
Understanding Referral Patterns for Bone Mineral Density Testing among Family Physicians: A Qualitative Descriptive Study
Introduction. Evidence of inappropriate bone mineral density (BMD) testing has been identified in terms of overtesting in low risk women and undertesting among patients at high risk. In light of these phenomena, the objective of this study was to understand the referral patterns for BMD testing among Ontario’s family physicians (FPs). Methods. A qualitative descriptive approach was adopted. Twenty-two FPs took part in a semi-structured interview lasting approximately 30 minutes. An inductive thematic analysis was performed on the transcribed data in order to understand the referral patterns for BMD testing. Results. We identified a lack of clarity about screening for osteoporosis with a tendency for baseline BMD testing in healthy, postmenopausal women and a lack of clarity on the appropriate age for screening for men in particular. A lack of clarity on appropriate intervals for follow-up testing was also described. Conclusions. These findings lend support to what has been documented at the population level suggesting a tendency among FPs to refer menopausal women (at low risk). Emphasis on referral of high-risk groups as well as men and further clarification and education on the appropriate intervals for follow-up testing is warranted.Peer Reviewe
Striped, Ellipsoidal Particles by Controlled Assembly of Diblock Copolymers
Control of interfacial
interactions leads to a dramatic change
in shape and morphology for particles based on poly(styrene-<i>b</i>-2-vinylpyridine) diblock copolymers. Key to these changes
is the addition of Au-based surfactant nanoparticles (SNPs) which
are adsorbed at the interface between block copolymer-containing emulsion
droplets and the surrounding amphiphilic surfactant to afford asymmetric,
ellipsoid particles. The mechanism of formation for these novel nanostructures
was investigated by systematically varying the volume fraction of
SNPs, with the results showing the critical nature that the segregation
of SNPs to specific interfaces plays in controlling structure. A theoretical
description of the system allows the size distribution and aspect
ratio of the asymmetric block copolymer colloidal particles to be
correlated with the experimental results