The internal structure of poly(methyl methacrylate) latexes in nonpolar solvents

Hypothesis: Poly(methyl methacrylate) (PMMA) latexes in nonpolar solvents are an excellent model system to understand phenomena in low dielectric media, and understanding their internal structure is critical to characterizing their performance in both fundamental studies of colloidal interactions and in potential industrial applications. Both the PMMA cores and the poly(12-hydroxystearic acid) (PHSA) shells of the latexes are known to be penetrable by solvent and small molecules, but the relevance of this for the properties of these particles is unknown. Experiments: These particles can be prepared in a broad range of sizes, and two PMMA latexes dispersed in n-dodecane (76 and 685 nm in diameter) were studied using techniques appropriate to their size. Small-angle scattering (using both neutrons and X-rays) was used to study the small latexes, and analytical centrifugation was used to study the large latexes. These studies enabled the calculation of the core densities and the amount of solvent in the stabilizer shells for both latexes. Both have consequences on interpreting measurements using these latexes. Findings: The PHSA shells are highly solvated (∼85% solvent by volume), as expected for effective steric stabilizers. However, the PHSA chains do contribute to the intensity of neutron scattering measurements on concentrated dispersions and cannot be ignored. The PMMA cores have a slightly lower density than PMMA homopolymer, which shows that only a small free volume is required to allow small molecules to penetrate into the cores. Interestingly, the observations are essentially the same, regardless of the size of the particle; these are general features of these polymer latexes. Despite the latexes being used as a model physical system, the internal chemical structure is complex and must be fully considered when characterizing them

Getting out and staying out: results of the prisoner Resettlement Pathfinders

Short-term prisoners have exceptionally high reconviction rates, fuelled by major social problems. Growing recognition of this, and of deficiencies in prison-probation coordination, has accelerated 'resettlement' of ex-prisoners up the penal agenda. The 'Resettlement Pathfinders' tested several new partnership-based approaches. This report evaluates three probation-led projects which combined practical assistance with interventions to improve motivation and capacity to change. Their key feature was the delivery of a cognitive-motivational programme ('FOR - A Change') specially designed for short-termers. The study found this produced significant changes in attitude, as well as greater 'continuity' (voluntary post-release contact between offenders and project staff) than previous approaches. It also found evidence of association between continuity and reduced reconviction. Overall, the findings support resettlement strategies based on fostering and nurturing offenders' motivation to change, facilitating access to services, and 'through the gate' contact with staff or volunteers with whom a relationship has already been built. The research offers findings and insights of practical value to probation and prison officers, as well as staff of other agencies that work with prisoners and ex-prisoners. The report should also be read by penal policy-makers, criminology/criminal justice academics and students, and those engaged in staff training

Tunirrusiangit : Kenojuak Ashevak and Tim Pitsiulak = ᑐᓂᕐᕈᓯᐊᖏᑦ : ᕿᓐᓄᐊᔪᐊᖅ ᐋᓯᕙᒃ ᐊᒻᒪᓗ ᑎᒻ ᐱᑦᓯᐅᓛᖅ

"Tunirrusiangit, "their gifts" or "what they gave" in Inuktitut, celebrates the achievements of two remarkable artists who challenged the parameters of tradition while consistently articulating a compelling vision of the Inuit world view. Published to coincide with a major exhibition at the Art Gallery of Ontario, opening on 16 June and continuing until late August, Tunirrusiangit features more than 60 reproductions of paintings, drawings, and documentary photographs. Completing the book are essays by contemporary artists and curators Jocelyn Piirainen, Anna Hudson, Georgiana Uhlyarik, Koomuatuk Curley, Laakkuluk Williamson Bathory, and Taqralik Partridge that address both the past and future of Inuit identity." -- Publisher's website

Shelter use interactions of invasive lionfish with commercially and ecologically important native invertebrates on Caribbean coral reefs.

Indo-Pacific lionfish have become invasive throughout the western Atlantic. Their predatory effects have been the focus of much research and are suggested to cause declines in native fish abundance and diversity across the invaded range. However, little is known about their non-consumptive effects, or their effects on invertebrates. Lionfish use shelters on the reef, thus there is potential for competition with other shelter-dwelling organisms. We demonstrate similar habitat associations between invasive lionfish, native spiny lobsters (Panulirus argus) and native long-spined sea urchins (Diadema antillarum), indicating the potential for competition. We then used a laboratory experiment to compare activity and shelter use of each species when alone and when lionfish were paired with each native species. Spiny lobsters increased their activity but did not change their shelter use in the presence of a lionfish, whilst long-spined sea urchins changed neither their activity nor shelter use. However, lionfish reduced their shelter use in the presence of spiny lobsters and long-spined sea urchins. This study highlights the importance not only of testing for the non-consumptive effects of invasive species, but also exploring whether native species exert non-consumptive effects on the invasive