Advances in the Study of Respiration-Deficient (Rd) Mutation in Yeast and Other Microorganisms

Differential Effect of Respiratory Inhibitors on Ergosterol Synthesis bySaccharomyces cerevisiaeDuring Adaptation to Oxygen

“…5 with the control cells exhibiting the decline and subsequent increase in sterol content, it can be seen that, whereas the control cells show a decline at 16 hr, the cells aerated with acriflavine continue to increase in sterol content at 12 hr, after which the sterol content gradually declines. This phenomenon is explainable if one considers the evidence (14) that in the beta fraction of mitochondrial DNA is encoded information for some component necessary for respiratory competency, that acriflavine in solution with DNA is intercalated between adjacent nucleotide bases causing an extension and partial unwinding of the DNA (9), and that yeasts aerated in the presence of acriflavine do not become respiratory-competent (15). If the hypothesis that the adaptation from a fermentative to a respiratory metabolism is intimately related to the decline and subsequent increase in base-labile sterol is correct (1), the "overshoot" of base-labile sterol detected in the presence of the acriflavine can be explained.…”

Investigating the Dynamics of Pt/CeO2 Catalysts at the Powder Agglomerate Scale by Combining In Situ Hyperspectral Raman Imaging and SEM‐EDX Analysis

“…[1,[6][7][8][9] In fact, the Pt/CeO 2 catalytic performance is related to the geometric and electronic properties of Pt active sites and the metal-oxide interfacial structure, [10,11] which in turn depend on the reaction conditions. [12,13] Pt single atoms (SAs) are prone to agglomerate into Pt clusters/nanoparticles under reducing atmosphere, while the strong PtÀ OÀ Ce interaction favours redispersion of platinum as PtO x clusters or SAs [13][14][15][16] (e.g. Pt SAs trapped on ceria defects).…”

“…Pt single atoms (SAs) are prone to agglomerate into Pt clusters/nanoparticles under reducing atmosphere, while the strong Pt−O−Ce interaction favours redispersion of platinum as PtO x clusters or SAs [13–16] (e.g. Pt SAs trapped on ceria defects) [17,18] .…”

“…Rapid and efficient oxidative redispersion of large Pt agglomerates on a ceria‐based oxide support during rapid redox cycling (60 s) was evidenced from X‐ray absorption spectroscopy analysis at 500 °C and above, but not at 400 °C [16] . However, a high mobility and redispersion of Pt particles was observed already at 400 °C after 10 min under O 2 (2.5 mbar), especially for small nanoparticles (<2 nm), by Transmission Electron Microscopy (TEM) and Scanning Transmission Electron Microscopy (STEM) [26] .…”

Production of petite mutants of Saccharomyces cerevisiae by patulin

“…This extrachromosomal hereditary material is responsible for control of many, if not all, of the aerobic processes of mitochondria. Mutation of this genetic factor results in a cell which is unable to reduce the dye 2,3,5-triphenyltetrazolium chloride, cannot utilize carbon sources requiring oxidative degradation such as lactate, acetate, and glycerol, and has a modified cytochrome content (Nagai et al, 1961).…”