The goal of this study is to test photoelastic resins for manufacturing models with teeth and/or implants under chewing load. Four commercial brands have been chosen: Araldite (Ciba Chemicals), Flexible GIV-Rigid GIV (Polipox) and PL2 (Measurements Group). Nine discs were manufactured, four of them from each of the photoelastic resin brands and five from different proportions of mixture between Flexible GIV and Rigid GIV. All the models were subjected to the diametral compression test, and observed in a circular polariscope. The first order fringe has always been adopted as a benchmark to calculate the photoelastic constant. To the load of interest (150 Newtons), Flexible GIV resin showed areas that followed the elastic regime. Residual stresses for the resin PL2 and persistence of bubbles within the model were observed. Rigid GIV Resin generated the first fringe order only at 280 Newtons load. Araldite resin behaved within the elastic regime and there were no areas with excessive concentration of fringes. The models generated from the manual mixing generated non-homogeneous photoelastic images. The Araldite resin showed to be the most suitable material for manufacturing birefringent models with teeth and/or implants under chewing load.

The interest in the chemistry of cobalt (II) tetrasulfonated phthalocyanine (PcTsCo) comes mainly from its macrocycle-ligand structure combined with their special chemical characteristics, such as high solubility, well-defined redox reactions and remarkable optical absorption in the visible region. In this work, we use layer-by-layer technique in order to assemble CoTsPc and poly(allylaminehydrochloride) (PAH) in hybrid supramolecular system. The electronic spectroscopy and cyclic voltammetry techniques were utilized to study PAH/CoTsPc multilayers growth and the cysteine catalytic oxidation. PAH/CoTsPc showed high electrochemical stability and worthwhile to mention is the remarkable influence of supramolecular arrangement on the final redox properties of the system.

Objetivou-se com este trabalho avaliar o efeito de diferentes coberturas de plantas sobre a qualidade fisiológica de sementes de feijão em plantio direto no município de Diamantina - MG. O experimento foi instalado no Campus II da UFVJM, num Neossolo Quartzarênico Órtico típico, no delineamento em blocos casualizados, com dez tratamentos e quatro repetições. Os tratamentos constituíram-se de palhada dessecada e roçada de 1) Brachiaria decumbens cv. Basilisk, 2) Brachiaria brizantha cv. Marandu, 3) Panicum maximum cv. Tanzânia, 4) Panicum maximum cv. Mombaça, 5) Mucuna aterrina (mucuna preta), 6) Calopogonio muconoides cv. Calopogonio, 7) Dolichos lab lab (lab lab), 8) Cajanus cajan (guandu), 9) Cobertura natural e 10) Plantio convencional onde se efetuou o plantio de feijão cultivar Talismã. A qualidade fisiológica das sementes foi avaliada pelos testes de germinação (primeira contagem e contagem final); condutividade elétrica dos solutos; peso de 100 sementes; comprimento e peso das plântulas; índice de velocidade de germinação e teor de água das sementes de feijão. As gramíneas Panicum. maximum cv. Mombaça, Brachiaria brizantha cv. Marandu, B. decumbens cv. Basilisk e P. maximum cv. Tanzânia produziram matéria seca em quantidade e uniformidade para maior conservação de água e proteção do solo para viabilizar o sistema plantio direto. A qualidade das sementes não foi afetada pelos manejos de solo utilizados e sim pelas condições climáticas na maturação.

The objective this work was evaluate the effect of different coverings plants on the physiological quality seeds of bean in no-tillage system in Diamantina - MG. The experiment was installed in the Campus II of UFVJM, in a Neossolo Quartzarênico Órtico típico, in blocks randomized design, with ten treatments and four replicates. The treatments were constituted of control chemical and rubbed straw of 1) Brachiaria decumbens cv. Basilisk, 2) Brachiaria brizantha cv. Marandu, 3) Panicum maximum cv. Tanzania, 4) Panicum maximum cv. Mombaça, 5) Mucuna aterrina (black mucuna), 6) Calopogonio muconoides cv. Calopogonio, 7) Dolichos lab lab (lab lab), 8) Cajanus cajan (guandu), 9) Natural covering and 10) Conventional plantation where the bean plantation was made to cultivate Talisman. The physiological quality of the seeds was evaluated by the germination tests (first and final count); electric conductivity of the solute; weigh of 100 seeds; length and weight of the plants; index of germination speed and text of water of the bean seeds. The grass Panicum. maximum cv. Mombaça, Brachiaria brizantha cv. Marandu, B. decumbens cv. Basilisk and P. maximum cv. Tanzania produced dry matter in amount and uniformity for larger conservation of water and protection of the soil to make possible the no-tillage system. The quality of the seeds was not affected by the used soil handlings but had the influence of the climatic conditions in the maturation.

O objetivo deste trabalho foi avaliar a produção de palhada e o efeito de diferentes plantas de cobertura sobre características do feijão, em sistema de plantio direto, em Diamantina, MG. O experimento foi instalado num Neossolo Quartzarênico Órtico típico, utilizando-se o delineamento em blocos ao acaso e três repetições. Os tratamentos constituíram-se de: Brachiaria decumbens, B. brizantha, Panicum maximum cv. Tanzânia, P. maximum cv. Mombaça, Mucuna aterrima, Calopogonio mucunoides cv. Calopogônio, Dolichos lab lab, Cajanus cajan, Crotalaria juncea, pousio e testemunha, sobre os quais foi cultivado feijão cv. Talismã. Avaliou-se a massa de matéria seca das plantas de cobertura e, no feijoeiro, estande de plantas, número de sementes, número de vagens, número de sementes por vagem, altura de plantas, peso de 100 sementes e produtividade. Não houve diferença significativa entre os tratamentos para as variáveis número de sementes, número de vagens, número de sementes por vagem e altura das plantas. Os maiores valores de peso de 100 sementes e de produtividade de feijão foram obtidos nas parcelas com as gramíneas P. maximum cv. Mombaça, B. brizantha, B. decumbens e P. maximum cv. Tanzânia, que também produziram quantidade suficiente de matéria seca para viabilizar o sistema de plantio direto de feijão.

The objective of this work was to evaluate the straw production and the effect of different covering plants on some common bean characteristics, in no-tillage system, in Diamantina, MG, Brazil. A radomized block was used as experimental design, with three replications. Treatments were constituted of: Brachiaria decumbens, B. brizantha, Panicum maximum cv. Tanzania, P. maximum cv. Mombaça, Mucuna aterrima, Calopogonio mucunoides cv. Calopogônio, Dolichos lab lab, Cajanus cajan, Crotalaria juncea, fallow and control, on which common bean cultivar Talismã was planted. For covering, the weight of dry matter was evaluated and, for bean plants, the following data were analyzed: the final stand of plants, number of seeds, number of pods, number of seeds per bean, plants height, weight of 100 seeds and the yield of the culture. There was no significant difference among treatments for the variables number of seeds, number of beans, number of seeds per bean and plants height. The largest values of weight of 100 seeds and productivity of bean were obtained when cultivation was made in the no-tillage system on straw of P. maximum cv. Mombaça, B. brizantha, B. decumbens and P. maximum cv. Tanzania. These cover crops also produced sufficient amount of dry matter to make possible the no-tillage system.