Electromagnetic energy within magnetic spheres

Consider that an incident plane wave is scattered by a homogeneous and isotropic magnetic sphere of finite radius. We determine, by means of the rigorous Mie theory, an exact expression for the time-averaged electromagnetic energy within this particle. For magnetic scatterers, we find that the value of the average internal energy in the resonance picks is much larger than the one associated with a scatterer with the same nonmagnetic medium properties. This result is valid even, and especially, for low size parameter values. Expressions for the contributions of the radial and angular field components to the internal energy are determined. For the analytical study of the weak absorption regime, we derive an exact expression for the absorption cross section in terms of the magnetic Mie internal coefficients. We stress that, although the electromagnetic scattering by particles is a well-documented topic, almost no attention has been devoted to magnetic scatterers. Our aim is to provide some new analytical results, which can be used for magnetic particles, and emphasize the unusual properties of the magnetic scatters, which could be important in some applications. (C) 2010 Optical Society of America

Evaluation of the influence of different types of seats on postural control in individuals with paraplegia

Study design: Cross-sectional study. Objectives: To assess the importance of proprioceptive and vision information on different types of wheelchair seats with regard to postural control in paraplegic individuals during static posture. Setting: Centre of Rehabilitation at the University Hospital/FMRP-USP and Rehabilitation Outpatient Clinic at University Hospital/UNICAMP, Brazil. Methods: This study involved 11 individuals with paraplegia. All individuals were submitted to an evaluation of static balance with their eyes open and closed in three different types of seats: wheelchair seat, foam seat and gel seat. Balance evaluation was performed by using the Polhemus system, in which body displacements and anteroposterior and mediolateral speeds were assessed in a static seated position in the different types of seats. Data were analyzed using analysis of variance. The differences were considered at P<0.05. Results: No statistical differences were found between the three types of seats in terms of displacements and anteroposterior and mediolateral speeds, or between seats with individuals keeping their eyes open or closed (P>0.05). However, it was observed that body displacements were more prominent toward an anteroposterior than a mediolateral direction. Conclusion: This study suggests that individuals with paraplegia tend to exhibit a more anteroposterior body displacement than a mediolateral one, with no significant differences between the types of seats in both situations of eyes open and closed. Spinal Cord (2010) 48, 825-827; doi:10.1038/sc.2010.30; published online 30 March 2010

Delayed orbital hemorrhage after routine strabismus surgery

PURPOSE: To report a case of delayed rectus muscle hemorrhage after strabismus surgery. METHODS: Case report. RESULTS: Rectus muscle hemorrhage occurred 36 hours after strabismus surgery in a 26-year-old man, causing temporary loss of vision and reduced ocular motility. Urgent lateral cantholysis and orbital exploration to restore hemostasis were undertaken. Full recovery of vision occurred and a small residual motility disturbance was present 3 months postoperatively. CONCLUSION: Delayed rectus muscle hemorrhage post-strabismus surgery is rare but can have sight-threatening effects. When vision is threatened because of optic nerve compromise, urgent orbital exploration may allow full recovery of function. (Am J Ophthalmol 2001;131: 818-819, (C) 2001 by Elsevier Science Inc. All rights reserved.).

Corneal endothelial response to induced myopia in the chicken

Purpose: To investigate the role of corneal endothelial surface enlargement in the chicken myopia model in inducing corneal endothelial changes. Methods: Lid suture was performed on one eye of 1-day-old cockerels. Five chickens were killed at 1 week, and four chickens killed at each of 3 weeks, 6 weeks, and 10 weeks postnatal. The endothelial morphology was obtained by flat mounting the endothelial surface and the subsequent digitisation. Comparisons were undertaken between the control unsutured eye and the lid-sutured eye endothelium, and between the central endothelial areas compared to the peripheral endothelial areas in both the myopic and the normal corneas. Calculation of the contribution to the endothelial change by hypertrophy and mitosis were calculated using Bahn's formula. Results: Total endothelial surface area increased significantly over time in the myopic model compared to control eyes but the mean cell area of endothelial cells remained the same for both the enlarged myopic endothelial surface area and in the normal controls. Sampling from the central and the peripheral corneal endothelial surface also disclosed no difference. The mean cell area did increase steadily with age but was the same for both normal and myopic corneas. Conclusions: It would appear that there are equal contributions from hypertrophy and mitosis in the myopic group and the normal corneal group with a slightly increasing trend towards mitotic activity in the myopic corneal endothelial layer.

Review of treatment of pterygium in Queensland: 10 years after a primary survey

Purpose: To assess the practices in pterygium removal as a follow-up study to a similar project 10 years ago, in order to compare the current trends with those noted a decade ago. Methods: A survey was sent to all practising ophthalmologists in Queensland (100). Results: Eighty-seven of the 100 ophthalmologists undertook pterygium surgery with no change in indications for removal, grading or anaesthesia compared to 10 years ago. Nearly half of the ophthalmologists varied their surgical technique from eight commonly used methods according to the individual patient. More than half the respondents used a swinging conjunctival flap and 29% used simple excision leaving the area bare for primary pterygia, although nearly one-quarter of the ophthalmologists added adjunctive therapies such as beta irradiation or mitomycin. For recurrent pterygia, one-third of ophthalmologists preferred adjunctive therapies, and 57% used an autoconjunctival transplant. Conclusion: There has been no consistent trend in surgical removal of pterygia with a significant number of primary pterygia still removed using bare scleral closure.

Corticosteroid-induced glaucoma in a child after a scleral reinforcement procedure

Corticoteroid-induced glaucoma can result from either topical or systemic corticosteroid use. Compared with adults, the corticosteroid response in children is less well known. The case is reported of a child who developed glaucoma after receiving topical corticosteroids following a scleral re-inforcement procedure. The raised intraocular pressure was controlled after cessation of the corticosteroids and with the use of antiglaucoma therapy. As many forms of cortico-steroids are widely used, children on corticosteroids should have regular intraocular pressure measurements as part of their management.

Intraorbital anatomy of the koala (Phascolarctos cinereus)

This is the first documented study of the anatomical details of the contents of the normal koala orbit, excluding the bulbus oculi. Baseline data were established which are necessary for understanding and treating ocular disease in the koala (Phascolarctos cinereus). The anatomy of the orbital contents of the koala were examined and described from animals that presented dead or were euthanized for humane reasons. Dissections of the orbital cavity were performed under magnification. Polymethyl methacrylate (PMMA) casts of the nasolacrimal system and the vascular supply of the orbit were also made in order to study these systems. The superficial lymphatic drainage of the conjunctival tissues was studied by subcutaneous injection of Evan's Blue into the palpebral conjunctiva of a freshly deceased animal, and by Microfil casts of the efferent lymphatics. In general, the orbital contents of the koala are consistent with those of other carnivorous polyprotodont and herbivorous diprotodont marsupials.

Bony orbital anatomy of the koala (Phascolarctos cinereus)

This is the first documented study of the anatomical details of the normal koala orbit. Baseline data are established which are necessary for understanding and treating ocular disease in the koala (Phascolarctos cinereus). The bony anatomy of the orbit of the koala was examined and described from animals that presented dead or had been euthanized for humane reasons. Dissections of the orbital cavity were performed under magnification, and descriptions of the orbital bones were from macerated skulls that had been boiled and cleaned, In general, the orbital bones of the koala, and their respective foramina, are consistent with those of other carnivorous polyprotodont and herbivorous diprotodont marsupials.

Análise do processo de implementação de políticas de saúde: Um estudo de caso baseado no enfoque da política institucional

O processo de implementação de políticas públicas tem se apresentado como o elo perdido da ação governamental. Apesar da importância desse processo, esta etapa carece de métodos de análises que deem conta de sua complexidade como forma de lhe garantir uma posição chave dentro do ciclo da análise de políticas públicas. A partir da adaptação do referencial da política institucional, proposta pelo grupo Francês Strategor, que analisa uma instituição sob quatro determinantes – estratégia, estrutura, decisão e identidade-, este estudo propõe-se a analisar o processo de implementação de uma política municipal de saúde voltada para Hipertensos e Diabéticos no município de Venda Nova do Imigrante/ES, avaliada como uma estratégia exitosa. Como resultado, esse estudo evidenciou que o processo exitoso de implementação da política avaliada pautou-se numa decisão participava e colegiada, no reconhecimento e valorização da autonomia profissional e na discussão democrática. Além disso, a estrutura institucional analisada proporcionou uma coordenação menos normativa, que favoreceu momentos de encontro entre o núcleo estratégico e os centros operacionais, rompendo com a excessiva verticalização das estruturas tradicionais. A análise do determinante identidade demonstrou uma apropriação dos valores e da missão institucional e um importante envolvimento dos atores, indicado pelo fortalecimento de parcerias e sinergias internas. A estratégia de implementação dessa política municipal mostrou-se potente no sentido de inverter a lógica do modelo de atenção, dentro de um processo de aprendizado, sendo este o grande diferencial competitivo de sucesso da instituição. A partir desses resultados, o referencial de Strategor se afirma como importante método de análise do processo de implementação, além de sua potência para indicar questões que colaborem para garantir à etapa de implementação uma posição de destaque dentro do ciclo da política pública.

Edward Said Um Intelectual Crítico e Cosmopolita

Edward Said, palestiniano cidadão do mundo, historiador crítico da literatura e da cultura preocupa-se em analisar e desmistificar as representações ideológicas que afirmam a superioridade de uma cultura sobre as outras. Em Orientalismo , publicado originalmente em 1978, demonstra como o colonialismo europeu constrói uma representação do mundo oriental, especialmente do mundo árabe e muçulmano, em que os representados surgem como seres incapazes de autonomia, racionalidade e autogoverno. Como contraponto a esta concepção, desenvolve-se, no período da emancipação e das independências coloniais, uma nova visão em que os povos colonizados de mero objecto de representação se transformam em sujeitos da sua própria história. Em Cultura e Imperialismo , publicado em 1993, Said analisa como os intelectuais e os criadores dos povos dominados elaboram uma nova representação de si próprios e do Outro no âmbito do processo de luta e emancipação colonial. Mas apenas a livre interacção e interdependência das culturas poderá constituir uma síntese superadora do imperialismo e do nacionalismo anticolonial. Dimensão libertadora que se tornará a verdadeira missão e vocação do intelectual sem fronteiras de que Said foi um dos maiores expoentes contemporâneos.

A influência da poesia no desenvolvimento da linguagem oral de uma aluna com Trissomia 21

O conceito de poesia é uma forma de arte e traduz-se como um espelho do pensamento do homem realizado na palavra oral e escrita. A poesia poderá ensinar o homem no estudo da palavra, através do seu significado nos valores denotativo e/ou conotativo. A aplicação destes conceitos faz sentido, a partir da ideia de que a palavra no contexto da poesia pode produzir emoções e sensações nas pessoas a quem ela é transmitida. A poesia tem funções multissensoriais que podem definir o input linguístico como forma de desenvolver a linguagem. Vários são os estudos que apontam para as principais competências deficitárias nos indivíduos com Trissomia 21, mas poucas são as investigações que se debruçam sobre a influência da poesia nas várias competências linguísticas. Uma perceção mais ampla e visionária da Arte na voz da poesia pela parte da escola, professores e, em particular, professores de Educação Especial permitirá adotar estratégias de intervenção inovadoras. Pretende este estudo investigar e analisar a forma como a poesia pode influenciar o desenvolvimento da linguagem oral numa aluna com Trissomia 21. Neste projeto, a partir da identificação do caso-problema e da constatação da ausência da poesia no currículo da aluna, procurou-se intervir, no sentido de melhorar as suas competências linguísticas, utilizando para tanto a poesia. A implementação do projeto aconteceu ao longo de seis meses durante quinze sessões de intervenção individuais. Os resultados do projeto mostram que, em todas as competências linguísticas, houve um processo evolutivo, sendo particularmente significativo o desenvolvimento da competência fonológica, aumento de vocabulário e uma maior noção da palavra em contexto. Estes dados levam-nos a crer que a utilização da poesia poderá, também, constituir uma forma de promover a socialização e a autonomia, revelando os efeitos colaterais que poderão decorrer deste tipo de intervenção. - Abstract The concept of poetry is a form of art, showing the man's thought held in the spoken and written word. Poetry can teach man in the study of the word, its meaning through denotative and/or connotative values. The application of these concepts makes sense, from the idea that the word in the context of poetry can stir emotions and feelings in the people to whom it is transmitted. Poetry has multisensory functions that can set the linguistic input as a way to develop language at phonological, lexical, semantics, pragmatic and morfosyntactic skills. There are several studies that point out to the key skills deficit in individuals with Trisomy 21, but there are few investigations that focus on the influence of poetry in various language skills. A broader perception and vision of poetry as art given by school, and teachers, and, particularly teachers of Special Education will allow a more effective intervention strategies. This study aims to investigate and analyze how poetry can influence the development of oral language in a student with Trisomy 21. In this project, we tried to intervene, improving the language skills of the student, using poetry from the identification case-problem and confirmation of the absence of poetry in her curriculum. The implementation of the project took place throughout six months for fifteen individual intervention sessions. The project results show that, in all language skills, there was a progressive process, being particularly significant the development of the phonological skills, increased vocabulary and a greater sense of the word into context. These data lead us to believe that the use of poetry can also be a way to promote socialization and autonomy, revealing the side effects that may result from this type of intervention.