Stimulatory effect of alcohols (methanol and ethanol) on citric acid productivity by a 2-deoxy D-glucose resistant culture of Aspergillus niger GCB-47

Production of polyhydroxyalkanoates (PHAs) by Bacillus subtilis and Escherichia coli grown on cane molasses fortified with ethanol

“…With further increase in ethanol concentration, a decrease in the growth and PHA production occurred. This might be due to the fact that the higher ethanol concentration in the medium disturbed the bacterial metabolism and inoculum morphology, which resulted in decreasing in PHA production by the tested strains (Haq et al 2003). The stimulating effect of ethanol on PHA production suggested that ethanol could be used as an additional cheap carbon source to be converted into PHA.…”

Enhanced solubilization of iron and calcium phosphates by Aspergillus niger by the addition of alcohols

“…Grisham and Barnett (1972) attributed the decline in citric acid production to the higher concentrations of alcohols, which inhibited the membrane enzymes. Haq et al (2003) reported that the decrease in citric acid production was due to a change in fungal metabolism and mycelial morphology. In fact, this mechanism is complex and many physiological and biochemical effects induced by alcohols may change the permeability of the membrane and the enzymes involved in the absorption of nutrients and secretion of citric acid.…”

The use of additives as the stimulator on mycelial biomass and exopolysaccharide productions in submerged culture of Grifola umbellata

“…It was found that all the alcohols produced negative effects for cell growth and EPS production in G. umbellata culture. Haq et al [22] had reported that alcohols addition could increase the permeability of cell membrane in Aspergillus niger culture. Yung et al [15] also found that ethanol addition could enhance mycelial biomass and EPS productions in Ganoderma lucidum culture.…”