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Influência da temperatura de formação do íon de Keggin no processo de pilarizaç...
Guerra,D. L; Lemos,V. P; Fernandes,E. F; Angélica,R. S; Costa,M. L. daAs amostras de esmectita do estado do Pará, Amazônia, Brasil foram caracterizados utilizando XRD, FTIR e análise textural por curvas isotérmicas adsorpition-desorption nitrogênio. Na produção das argilas pilarizadas foi usado o íon Al13 (o íon de keggin), este íon foi obtido pela reação das soluções AlC(l3)6H2O / NaOH, com razão molar OH/Al=2, com intercalação em temperatura ambiente, durante as 3 horas e calci...
Changes in cell shape and desmin intermediate filament distribution are associa...
Mermelstein,C.S.; Amaral,L.M.; Rebello,M.I.L.; Reis,J.S.N.; Borojevic,R.; Costa,M.L.Desmin is the main intermediate filament (IF) protein of muscle cells. In skeletal muscle, desmin IFs form a scaffold that interconnects the entire contractile apparatus with the subsarcolemmal cytoskeleton and cytoplasmic organelles. The interaction between desmin and the sarcolemma is mediated by a number of membrane proteins, many of which are Ca2+-sensitive. In the present study, we analyzed the effects of ...
Monte Carlo study of the spin-1 Baxter-Wu model
Costa,M. L. M.; Plascak,J. A.The two-dimensional spin-1 Baxter-Wu model is studied by using Monte Carlo simulations. The standard single-spin-flip Metropolis algorithm is used to generate the configurations from which the order parameter, specific heat and magnetic susceptibility are measured. The finite-size scaling procedure is employed in order to get the critical behavior. Extensive simulations show that the critical exponents are diff...
Desmin: molecular interactions and putative functions of the muscle intermediat...
Costa,M.L.; Escaleira,R.; Cataldo,A.; Oliveira,F.; Mermelstein,C.S.Desmin is the intermediate filament (IF) protein occurring exclusively in muscle and endothelial cells. There are other IF proteins in muscle such as nestin, peripherin, and vimentin, besides the ubiquitous lamins, but they are not unique to muscle. Desmin was purified in 1977, the desmin gene was characterized in 1989, and knock-out animals were generated in 1996. Several isoforms have been described. Desmin I...
Cytoskeletal and cellular adhesion proteins in zebrafish (Danio rerio) myogenesis
Costa,M.L.; Escaleira,R.; Manasfi,M.; Souza,L.F. de; Mermelstein,C.S.The current myogenesis and myofibrillogenesis model has been based mostly on in vitro cell culture studies, and, to a lesser extent, on in situ studies in avian and mammalian embryos. While the more isolated artificial conditions of cells in culture permitted careful structural analysis, the actual in situ cellular structures have not been described in detail because the embryos are more difficult to section an...
Changes in cell shape, cytoskeletal proteins and adhesion sites of cultured cel...
Mermelstein,C.S.; Rebello,M.I.L.; Amaral,L.M.; Costa,M.L.Although much is known about the molecules involved in extracellular Ca2+ regulation, the relationship of the ion with overall cell morphology is not understood. The objective of the present study was to determine the effect of the Ca2+ chelator EGTA on the major cytoskeleton components, at integrin-containing adhesion sites, and their consequences on cell shape. Control mouse cell line C2C12 has a well-spread ...
Assessment of proteolysis and lipolysis in Serra cheese: effects of axial chees...
Macedo, A. C.; Costa, M. L.; Malcata, F. X.The degrees of proteolysis and Iipolysis in Serra cheese were measured in cheese samples obtained from experiments laid out as a three-way facto rial design replicated twice. The independent variables studied were the location within the cheese (from the center to the surface), the position in the lactation season (from October to June) and the ripening time (from 0 to 35 days). Ali three variables had statisti...
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