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Efeito fungitóxico in vitro do óleo resina e do óleo essencial de copaíba (Copa...
Deus,R.J.A.; Carvalho,A.S.C.; Banna,D.A.D.S.; Arruda,M.S.P.; Alves,C.N.; Santos,A.S.Óleo de Copaifera multijuga Hayne, in natura e as frações foram avaliadas quanto às atividades fungitóxicas in vitro, frente a cinco espécies de fungos filamentosos do gênero Aspergillus e três espécies de leveduras do gênero Candida. Concentrações de óleo resina e de óleo essencial na faixa de 0,08 mg mL-1 a 1,6 mg mL-1 foram usadas para as análises qualitativa e quantitativas. As amostras foram dispostas sobr...
Effect of the pH of growth on the survival of Lactobacillus delbrueckii subsp. ...
Silva, J.; Carvalho, A. S.; Ferreira, R.; Vitorino, R.; Amado, F.; Domingues, P.; Teixeira, P.; Gibbs, P. A.Aims: The aim of this study was to optimize survival of Lactobacillus delbrueckii subsp. bulgaricus during spraydrying and subsequent storage through optimizing the pH of growth conditions. Methods and Results: Cell concentrates previously grown without or with pH controlled were spray-dried and stored at 20ºC and heat treated at 57ºC. Cells grown under noncontrolled pH were more resistant to both drying and he...
Effect of various growth media upon survival during storage of freeze-dried Ent...
Carvalho, A.S.; Silva, J.; Ho, P.; Teixeira, P.; Malcata, F. X.; Gibbs, P.The effects of three different growth media (MRS, M17 and Lee’s) on survival during freeze-drying and subsequent storage of six strains of Enterococcus faecalis and two strains of E. durans were investigated. Methods and Results: Distinct Enterococcus spp. strains were grown on M17, MRS and Lee’s broth, freeze-dried and stored at 20 C in air under darkness. At regular intervals throughout storage, freeze-dried ...
Effects of addition of sucrose and salt, and of starvation upon thermotolerance...
Carvalho, A. S.; Silva, J.; Ho, P.; Teixeira, P.; Malcata, F. X.; Gibbs, P.Increased survival of freeze-dried cells of Lactobacillus bulgaricus was observed when the drying medium was supplemented with sucrose; however, the magnitude of such protection was dependent on the growth medium used. Supplementing the growth medium with NaCl markedly increased survival of dried cells, and only a small effect was exerted by the composition of the drying medium or prior to starvation of cells. ...
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