Navegando por Autor "ROTH, Anna Paula de Toledo Piza"

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Acesso aberto (Open Access)
Estabilidade aeróbia, pH e dinâmica de desenvolvimento de microrganismos da cana-de-açúcar in natura hidrolisada com cal virgem
(Universidade Federal do Pará, 2011-04) DOMINGUES, Felipe Nogueira; OLIVEIRA, Mauro Dal Secco de; SIQUEIRA, Gustavo Rezende; ROTH, Anna Paula de Toledo Piza; SANTOS, Juliana dos; MOTA, Diego Azevedo
The objective of this work was to evaluate the effect of whitewash addition and the times after application on aerobic stability and growth of microorganisms (fungi and yeasts) in fresh sugarcane. It was used a completely randomized experimental design, with four replications. Aerobic stability (temperature) and the concentrations of yeast and fungus and pH were evaluated in a split-splot scheme with five doses of whitewash (0; 0.5; 1.0; 1.5 and 2.0%) and five times after treatment (0, 24, 48, 72 and 96 hours). There was a significant effect of doses of whitewash for all evaluated parameters. The sugarcane which was not treated with whitewash (0.0%) showed a break in stability at the shortest time interval. The pH values increased gradually according to the dose of whitewash applied and they decreased over time. There was a numerical increase on the counting of yeast until 72 hours after application of whitewash, regardless to the dose, and the values tended to stabilize in 96 hours after treatment. There was no significant effect of whitewash doses on fungi development. The use of whitewash is effective in yeast growth control and it also promotes aerobic stability in fresh sugar cane.
Acesso aberto (Open Access)
Óxido de cálcio e Lactobacillus buchneri NCIMB 40788 na ensilagem de cana-de-açúcar in natura ou queimada
(Universidade Federal do Pará, 2011-11) SIQUEIRA, Gustavo Rezende; SCHOCKEN-ITURRINO, Ruben Pablo; ROTH, Anna Paula de Toledo Piza; DOMINGUES, Felipe Nogueira; FERRAUDO, Antonio Sergio; REIS, Ricardo Andrade
The objective of this trial was to evaluate the effects of the inclusion of calcium oxide (CaO) and/or L. buchneri (LB) on the losses and chemical composition changes of in natura and burned sugar cane silages. Silage treatments were: in natura sugar cane without additive (IS), with Lactobacillus buchneri (ISLB), with calcium oxide (ISCaO) equivalent to 1% of natural matter, and the combination of LB and CaO (ISLBCaO). Experimental design was completely randomized in a factorial scheme (2 × 4) considering status (burned or not) and additives (LB, CaO and LB+CaO) with three replications per treatment. Dry matter variation was lower for in natura and burned silages treated with CaO; regardless of the LB presence, the mean difference was 5.85 percentage units. In sugar cane silages without additives, higher dry matter recoveries were observed when the plant was ensiled with in natura silage (63.5%) compared with burned silage (46.8%). However, when additives (CaO and LB) were used, no significant differences occurred between the in natura and burned silage treatments. The presence of calcium oxide was the factor that provided the greatest discrimination among the data. Calcium oxide is effective in reducing losses and chemical changes on the in natura and burned silages. The L. buchneri acts effectively on burned sugar cane silages, and the latter are more susceptible to losses than those of in natura sugar cane.