Protonated melonate Ca[HC6N7(NCN)3]·7H2O – synthesis, crystal structure, and thermal properties

Calcium hydrogenmelonate heptahydrate Ca[HC6N7(NCN)3]·7H2O was obtained by metathesis reaction in aqueous solution. The structure of the molecular salt was elucidated by single-crystal X-ray diffraction. The crystal structure consists of alternating layers of planar monopronated melonate ions, Ca2+ and crystal water molecules. The anions of adjacent layers are staggered so that no π–π stacking occurs. The melonate entities are interconnected by hydrogen bonds within and between the layers. Ca[HC6N7(NCN)3]·7H2O was investigated by solid-state NMR and FTIR spectroscopy, TG and DTA measurements.

Collagen type-I leads to in vivo matrix mineralization and secondary stabilization of Mg-Zr-Ca alloy implants

Biodegradable magnesium-zirconia-calcium (Mg-Zr-Ca) alloy implants were coated with Collagen type-I (Coll-I) and assessed for their rate and efficacy of bone mineralization and implant stabilization. The phases, microstructure and mechanical properties of these alloys were analyzed using X-ray diffraction (XRD), optical microscopy and compression test, respectively, and the corrosion behavior was established by their hydrogen production rate in simulated body fluid (SBF). Coll-I extracted from rat tail, and characterized using fourier transform infrared (FT-IR) spectroscopy, was used for dip-coating the Mg-based alloys. The coated alloys were implanted into the femur bones of male New Zealand white rabbits. In vivo bone formation around the implants was quantified by measuring the bone mineral content/density (BMC/BMD) using dual-energy X-ray absorptiometry (DXA). Osseointegration of the implant and new bone mineralization was visualized by histological and immunohistochemical analysis. Upon surface coating with Coll-I, these alloys demonstrated high surface energy showing enhanced performance as an implant material that is suitable for rapid and efficient new bone tissue induction with optimal mineral content and cellular properties. The results demonstrate that Coll-I coated Mg-Zr-Ca alloys have a tendency to form superior trabecular bone structure with better osteoinduction around the implants and higher implant secondary stabilization, through the phenomenon of contact osteogenesis, compared to the control and uncoated ones in shorter periods of implantation. Hence, Coll-I surface coating of Mg-Zr-Ca alloys is a promising method for expediting new bone formation in vivo and enhancing osseointegration in load bearing implant applications.

Exposure to As(III) and As(V) changes the Ca��⁺-activation properties of the two major fibre types from the chelae of the freshwater crustacean Cherax destructor

Arsenic is a known carcinogen found in the soil in gold mining regions at concentrations thousands of times greater than gold. Mining releases arsenic into the environment and surrounding water bodies. The main chemical forms of arsenic found in the environment are inorganic arsenite (As(III)) and arsenate (As(V)). Yabbies (Cherax destructor) accumulate arsenic at levels comparable to those in the sediment of their environment but the effect on their physiological function is not known. The effects of arsenic exposure (10 ppm sodium arsenite, AsNaO2 - 5.7 ppm As(III)) and 10 ppm arsenic acid, Na2HAsO4·7H2O - 2.6 ppm As(V)) for 40 days on the contractile function of the two major fibre types from the chelae were determined. After exposure, individual fibres were isolated from the chela, "skinned" (membrane removed) and attached to the force recording apparatus. Contraction was induced in solutions containing increasing [Ca(2+)] until a maximum Ca(2+)-activation was obtained. Submaximal force responses were plotted as a percentage of the maximum Ca(2+)-activated force. As(V) exposure resulted in lower levels of calcium required for activation than As(III) indicating an increased sensitivity to Ca(2+) after long term exposure to arsenate compared to arsenite. Myosin heavy chain and tropomyosin content in individual fibres was also decreased as a result of arsenic exposure. Single fibres exposed to As(V) produced significantly more force than muscle fibres from control animals. Long-term exposure of yabbies to arsenic alters the contractile function of the two major fibre types in the chelae.

A tampa institucional da panela comunitária: quando o Poder Público se apropria do discurso comunitário - Jornal “Bilhete”, de Paranapiacaba/Parque Andreense, Santo André (SP)

O trabalho tem por objetivo analisar algumas edições do jornal “Bilhete”, produzido pela Prefeitura de Santo André e distribuído pelas regiões de Paranapiacaba e Parque Andreense. O veículo em questão conta com algumas características específicas que reúnem traços de folkcomunica��ão(baseado no “jornal do poste”), usa discurso local e comunitário e tem como uma de suas finalidades promover a divulgação de ações do Poder Público para a região, além de integrá-la à cidade.

Os bailes do Palácio de Mármore na cidade industrial: o Moinho São Jorge e o patrimônio industrial de Santo André (1950-2000) (Parte 1)

Pautado nessa perspectiva de valorização do patrimônio industrial na região do ABC, esse texto volta-se para as relações entre indústria, lazer e memória. Tem como foco o tema do lazer e do entretenimento como uma das construções patrimoniais da sociedade industrial. O Palácio de Mármore do Moinho São Jorge representa um caso em que tais relações se conjugam. Dessa forma, propõe-se com esse artigo, apontar as relações existentes entre industrialização e lazer no ABC no período de 1950/60, tomando como ponto de partida as lembranças das pessoas que viveram à época.

Benefícios fiscais nas importações executadas pelas Trading Company e as Comerciais Exportadoras pelos estados do Espírito Santo e Santa Catarina versus o fomento à exportação brasileira

Dissertação apresentada ao Programa de Pós – Graduação em Administração da Universidade Municipal de São Caetano do Sul como requisito parcial para obtenção do titulo de Mestre em Administração.