%0 Journal Article %A Maleszka, Ryszard %A James, Allen P. %A Schneider, Henry %T Ethanol Production from Various Sugars by Strains of Pachysolen tannophilus Bearing Different Numbers of Chromosomes %D 1983 %J Microbiology, %V 129 %N 8 %P 2495-2500 %@ 1465-2080 %R https://doi.org/10.1099/00221287-129-8-2495 %I Microbiology Society, %X Increasing chromosome number of Pachysolen tannophilus above the haploid level increased the yield of ethanol from d-xylose. There was a large increment on going from the haplophase to the diplophase, and the highest yields were obtained with either a triploid or a probable tetraploid, depending on the concentration of d-xylose. In addition, the rate of ethanol production from d-xylose and d-glucose increased, with the increment being larger on d-xylose. On d-galactose, the amount of ethanol produced within a given time also increased. The level of a by-product from d-xylose, xylitol, decreased on going from a haploid to higher ploidy, but there was no discernible trend for two other by-products, acetic acid and arabinitol. Increasing ploidy increased growth rate on d-galactose, but not appreciably on d-xylose. The altered properties on D-xylose of the strains tested were not due to increased levels of either d-xylose reductase or xylitol dehydrogenase, nor probably of alcohol dehydrogenase. %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-129-8-2495