2 Selection of thermotolerant yeasts with ethanol production
activity
4.2.1 Screening of yeast morphology under microscope
All isolates of yeast-like colonies were observed under compound microscope.
The number of yeast was only one strain from silage samples at 40 °
C. The
thermotolerant yeast strain S1 was screened from these colonies according to test for
their ethanol production at 40 °
C. Cell morphology was morphologically observed
under a microscope as shown in Figure 4.1.