On the changes in the physical properties of the ionized region around the Weigelt structures in Eta Carinae over the 5.54-yr spectroscopic cycle

We present HST/STIS observations and analysis of two prominent nebular structures around the central source of Eta Carinae, the knots C and D. The former is brighter than the latter for emission lines from intermediate or high ionization potential ions. The brightness of lines from intermediate and high ionization potential ions significantly decreases at phases around periastron. We do not see conspicuous changes in the brightness of lines from low ionization potential (<13.6 eV) that the total extinction towards the Weigelt structures is that the total extinction towards the Weigelt structures is AsubV =2/0. that the total extinction towards the Weigelt structures is AV = 2.0. Weigelt C and D are characterized by an electron density of that the total extinction towards the Weigelt structures is AV = 2.0. Weigelt C and D are characterized by an electron density of 10exp6.9 cm-3 that does not significantly change throughout the orbital cycle. The electron temperature varies from 5500 K (around periastron) to 7200 K (around apastron). The relative changes in the brightness of He I lines are well reproduced by the variations in the electron temperature alone. We found that, at phases around periastron, the electron temperature seems to be higher for Weigelt C than that of D. The Weigelt structures are located close to the Homunculus equatorial plane, at a distance of about 1240 AU from the central source. From the analysis of proper motion and age, the Weigelt complex can be associated with the equatorial structure called the Butterfly Nebula surrounding the central binary system.Comment: 19 pages, 18 figure

Management of functional neurological disorder.

Functional neurological disorder (FND) is a common cause of persistent and disabling neurological symptoms. These symptoms are varied and include abnormal control of movement, episodes of altered awareness resembling epileptic seizures and abnormal sensation and are often comorbid with chronic pain, fatigue and cognitive symptoms. There is increasing evidence for the role of neurologists in both the assessment and management of FND. The aim of this review is to discuss strategies for the management of FND by focusing on the diagnostic discussion and general principles, as well as specific treatment strategies for various FND symptoms, highlighting the role of the neurologist and proposing a structure for an interdisciplinary FND service

Magnetically controlled exciton transfer in hybrid quantum dot-quantum well nanostructures

A magnetophotoluminescence study of the carrier transfer with hybrid InAs/GaAs quantum dot(QD)-InGaAs quantum well (QW) structures is carried out where we observe an unsual dependence of the photoluminescence (PL) on the GaAs barrier thickness at strong magnetic field and excitation density. For the case of a thin barrier the QW PL intensity is observed to increase at the expense of a decrease in the QD PL intensity. This is attributed to changes in the interplane carrier dynamics in the QW and the wetting layer (WL) resulting from increasing the magnetic field along with changes in the coupling between QD excited states and exciton states in the QW and the WL

A Study of the Export Financing System in the Philippines

How much support is the Philippine government giving to its export sector by means of its financing schemes? Are the small and indirect exporters given preference or assistance? How supportive is the entire export financing system in the country to the attainment of an export-driven development strategy? These questions are the primary concern of this paper. Based on a survey sample of seven commercial banks, it examines the various components of the Philippine export financing system. A review of the Philippine trade policies and its export profiles is provided.financial market, financial economy, financial sector, export commodities, financial services

Mullitización de mezclas de arcilla caolinítica e hidróxido de aluminio

Se calcinaron mezclas de arcilla caolinítica e hidróxido de aluminio, los ensayos se realizaron entre 900 y 1400°C, a distintos tiempos de calentamiento. Los compuestos obtenidos se estudiaron por técnicas de difracción de rayos X, dejándose establecido que se produce reacción entre la $latex Al_{2}O_{3}$ agregada y la $latex SiO_{2}$ liberada, para formar mullita a temperaturas inferiores a 1400°C, cuando la mezcla se precalienta varias horas a temperaturas próximas a los 1000°C. Se confirmó el fenómeno de nucleación de mullita, por tratamientos térmicos similares en mezclas de ácido silícico e hidróxido de aluminio puros. Es de interés tecnológico lograr la transformación total a mullita, de mezclas arcilla alúmina, a temperaturas no mayores de 1400°C. Por esto, el presente trabajo tuvo por fin comprobar si la $latex \gamma -Al_{2}O_{3}$ que se forma durante el calentamiento del $latex Al(OH)_{3}$ puede entrar en la reacción de mullitización del caolín, combinándose con la sílice remanente.Mixtures of kaolin clay and aluminium hydroxide were heated to temperatures between 900 and 1400°C for different periods. The heat treated samples were studied by X-ray diffraction techniques. It was clearly shown that the added $latex Al_{2}O_{3}$ reacts with the free $latex SiO_{2}$ to form mullite at temperatures below 1400°C when the mixtures were preheated for several hours at temperatures approaching 1000°C. Through similar heating treatments in mixtures of silicic acid and pure aluminium hydroxide, the mullite nucleation phenomenon was confirmed. It is of technological interest to achieve the total transformation to mullite of the clay-alumina mixtures by heating to temperatures not exceeding 1400°C. It was the aim of the present investigation to observe the reaction between the $latex \gamma-Al_{2}O_{3}$ form ed from $latex Al(OH)_{3}$ and the silica freed from the kaolin to form mullite

Bioprospecção de actinobactérias da rizosfera para produção de metabólitos bioativos.

Actinobactérias rizosféricas, têm mostrado grande potencial na produção de metabólitos bioativos, sendo o gênero das Streptomyces o mais bem estudado e com melhor potencial para produção destes compostos. Assim, o presente trabalho visou realizar a bioprospecção de actinobactérias rizosféricas e avaliar o potencial de seus metabólitos bioativos no controle de bactérias patogênicas. Foram isoladas linhagens de actinobactérias de plantas sadias de milho, cultivado em diferentes regiões edafoclimáticas do Estado de São Paulo. As linhagens foram avaliadas quanto ao potencial de controle de Bacillus megaterium, Escherichia coli, Klebsiella spp., Pseudomonnas aeruginosa e Sthaphylococcus aureus. Os isolados que se mostraram eficientes em testes de antagonismo foram utilizados em ensaios de antibiose para verificação do potencial do composto bioativo no controle destes patógenos. Foram isolados 60 actinobactérias, identificadas morfologicamente como sendo do gênero Streptomyces. Dentre estas, 31 inibiram pelo menos 1 dos 5 patógenos em testes de antagonismos. Nos ensaios de antibiose, foi verificada a eficiência dos metabólitos de 25 actinobactérias no controle dos patógenos testados