poly methyl methacrylate (pmma) is the most common material used in prosthodontics. several studies indicate a breakdown of the number of very high resin bases after 2 to 3 years to avoid breaking bass and several attempts have been made, such as altering the chemical structure of resin by adding causes cross linking or copolymerization. the innovative method for improving the physical properti...

Evidence for the functional superiority of cells cultured as 3D aggregates or on 3D scaffolds over conventional 2D monolayer cultures has created interest in material and cell based methods that influence the formation and structure of multicellular aggregates in vitro. We have created a co-culture of primary rat hepatocytes and hepatic stellate cells on a poly(DL-lactic acid) surface, a poor s...

BACKGROUND Poly(amidoamine)s (PAAs) are synthetic polymers endowed with many biologically interesting properties, being highly biocompatible, non toxic and biodegradable. Hydrogels based on PAAs can be easily modified during the synthesis by the introduction of functional co-monomers. Aim of this work is the development and testing of novel amphoteric nanosized poly(amidoamine) hydrogel film in...

The ability to fabricate aligned nanofibers may open new avenues for the development of nerve regeneration using tissue engineering scaffolds. In this study, aligned poly(3-hydroxybutyrate)/poly(3-hydroxy butyrate-co-3-hydroxyvalerate) (PHB/PHBV) nanofibrous scaffolds were fabricated using electrospinning for the culture in vitro of Schwann cells (SCs) that physiologically assist in directing t...

conclusions the results suggest that b. coagulans is a good candidate for the fermentative production of phb. background biodegradable polyesters are candidates for the development of environmental friendly plastics. poly-β-hydroxybutyrate (phb) is a type of polyester from the hydroxyalkanoates family, synthesized by bacteria as an intracellular material and accumulated as granules in the cytop...

A chemically defined thermoresponsive hydrogel, poly(AEtMA-Cl-co-DEAEA) cross-linked with N,N'-methylenebisacrylamide, which allows enzyme-free passaging, was used as a substrate to culture murine embryonic stem cells (mESCs) under defined and undefined conditions. Analysis of 14 stem cell markers showed that the mESCs remained in a "naïve" state of pluripotency with differentiation potential t...

Extracts and tissue culture supernatants of axenic forms of T. rangeli were assayed for the presence of sialidase and trans-sialidase activities. Using sialyl(alpha 2-3)lactose, sialyl(alpha 2-6)lactose, poly(alpha 2-8)N-acetylneuraminic acid, fetuin and 4-methylumbelliferyl-N-acetylneuraminic acid as sialic acid donors, and lactose as a sialic acid acceptor, no trans-sialidase activity was det...

Expression of a Madin-Darby canine kidney (MDCK) cell taurine transporter was examined in Xenopus oocytes that had been injected with poly(A)+ RNA extracted from MDCK cells. Compared with water-injected oocytes, injection of total poly(A)+ RNA resulted in an increase in Na+-dependent taurine uptake which was directly related to the amount of RNA injected. The magnitude of expression in poly(A)+...