2.5. Scanning electron microscopy
Scanning electron microscopy was carried out following the
method described by Karnovsky[21] under high vacuum using a
microscope Zeiss Supra 55VP (Carl Zeiss, Oberkochen, Germany).
Samples were processed and observed in the Centro Integral de
Microscopía Electr onica (CIME), CCT-CONICET-UNT, San Miguel de
Tucum an (Argentina).
2.6. Statistical analysis
Determinations of total reducing sugars, ethanol and biomass
concentrations were carried out in triplicate, and the results
expressed as mean values. The mean values were submitted to
analysis of variance (ANOVA) by the Statistica Software 12. They
were compared using the Tukey's test at significance level
(P)