placed in artificial saliva at 37 +/- 1 degrees C and, after 1-, 3-, 5-, 24-h and 3-, 7-, 14-, and 30-day intervals, aliquots were removed and analyzed using high performance liquid chromatography. Data were analyzed by using Wilcoxon, Mann-Whitney or Kruskal-Wallis selleck screening library tests (alpha = 0.05). At 1 h, the concentration of MA released from U control specimens was higher than those of the other ones, and decreased after 3 h. WB specimens released lower amounts of MA than control specimens only for material U, at the 1- and 3-h periods. For all control specimens, concentrations of leached BA progressively decreased within 5 h and from 24 h to the end. WB specimens released significantly find more lower amounts of BA than did the control groups. The highest concentration of MA was leached from control specimens of Ufi Gel hard. Water-bath post-polymerization treatment caused a significant reduction in elution of BA. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 123:732-739, 2012″
“Bacteriocin produced by Lactobacillus lactis strain isolated from the marine environment, showed broad range of antibacterial activity against some major food borne pathogens. Maximum bacteriocin production was observed at 30 degrees C, pH 6.0 and 1.5% sodium chloride solution. The
enzymes alpha-amylase, DNase, RNase and lipase had a positive effect on bacteriocin production. Proteinase K and pepsin strongly inhibited bacteriocin production. Among detergents, Sodium dodecyl
sulphate (SDS), Tween 80 and Tritone AP24534 Angiogenesis inhibitor X-100 stimulated bacteriocin production. EDTA and urea strongly inhibited bacteriocin production. The bacteriocin was purified by ammonium sulphate precipitation and ion exchange ( DEAE cellulose) chromatography. The molecular weight was 94 kDA. The purified bacteriocin showed strong cytotoxicity in brine shrimp lethality assay and the LC50 value was 21.54 mu g/ml. The study revealed the possibility of using the bacteriocin as a food preservative and the L. lactis strain as a probiotic.”
“Polyetheretherketone (PEEK) composites reinforced by short carbon fibers (SCF) and potassium titanate whiskers (PTW) were prepared using twin-screw extrusion compounding and injection molding. The tribological properties of hybrid composites were investigated in dry sliding condition against steel. The effects of filler contents on the wear behavior were studied. It was found that the hybrid composite showed an excellent tribological property in dry sliding condition. Applied load had great effect on the tribological behavior of the composites. In most cases, the friction coefficient of the composite decreased with the load rising. The composites with higher CF contents showed outstanding tribological performances at low load but could worsen the wear behavior at high load.