One obvious reason is that oxygen is required to metabolize methanol (by reaction 32), and therefore fermenting methanol is an inefficient way of getting NADH or ATP, because respiration (reaction 28) provides a better alternative more economical in terms of oxygen— to get these resources.
Such strategies were first applied to MutS P. pastoris strains, which can only metabolize methanol very slowly and, therefore, need extra energy for biomass accumulation and expression of foreign proteins.
The overall process of ethanol formation is controlled by CH3 formation and CO insertion into CH3, and the productivity and selectivity of ethanol is controlled by methanol and CH3 formations; therefore, to achieve high productivity and selectivity of ethanol, Cu has to get help from the promoters, which should be able to boost CH3 formation and/or decrease methanol formation.
The outstanding stability of LipM in isopropanol, methanol and ethanol may therefore prove useful for use in biocatalysis such as optical resolution of chiral compounds, organic synthesis [ 1, 28].
This is an important point in the economics of running these cars, since methanol is a liquid, and therefore easier to handle than gaseous hydrogen or methane.Even so, the two vehicles still pre-mass-production prototypes have a long way to go to match a petrol car's economics.
Oxygen was observed to be totally converted via total oxidation and therefore, higher methanol conversion in the OSRM together with CO2 selectivity of 99% and H2 selectivity of 60% were obtained.
Intracellular flux calculation showed that about half of the methanol was dissimilated to CO2 and therefore additional NADH was produced which may consequently lead to down-regulation of TCA-cycle flux.
The understanding of the Cu ZnO synergy in the creation of the active sites for methanol and CO formation is therefore a key for the development of catalysts for CO-free methanol synthesis.
The level of AOX1 mRNA, encoding the alcohol oxidase enzyme and therefore indicating the induction of methanol as well as an active methanol metabolism, was much lower than the level of procollagen II mRNA.
"But there are issues with handling it and putting it on planes". Concerns abound that flammable liquid methanol will cause safety issues if spilled, and therefore might not be allowed on airplanes for a long time to come.
