Synergistic association between cytochrome bd-encoded Proteiniphilum and reactive oxygen species (ROS)-scavenging methanogens in microaerobic-anaerobic digestion of lignocellulosic biomass

Microaerobic conditions in anaerobic sludge promote changes in bacterial composition favouring biodegradation of polymeric siloxanes

“…In these cases, it seems that methanogens may have been beneted from the loss of abundance of Clostridia-related organisms, such as Desulfofarcimen sp., considering that these sulphate-reducing bacteria (SRB) may compete for hydrogen, acetate, and carbon dioxide with methanogens. Furthermore, it is likely that other, nondominant populations of facultative fermentative organisms efficiently contribute to sustain and maintain the balance of the AD trophic chain, showing an apparent community replacement with the same functional capabilities, as suggested by Wu et al 95 on synergetic systems. Nonetheless, considering the limitations of DGGE analyses, above-mentioned hypotheses must be conrmed with metagenomic and metatranscriptomics further analysis.…”

“…3B, band 1). This shi can be explained by the presence of reactive oxygen species (ROS), produced in redox reactions (triggered by oxygen), 41 which are toxic to strict anaerobes 95 such Desulfofarcimen sp. These organisms do not have the enzymatic machinery to reduce ROS (i.e., aerobic respiration), consequently causing a decrease in its viability and abundance, 96 as evidenced by the disappearance of DGGE band 1.…”

Correlation Analysis of the Bacterial Community and Wood Properties of Populus × euramericana cv. “74/76” Wet Heartwood

“…According to reports, the main gases in wet heartwood are CH 4 , N 2 , and CO 2 , with a small amount of H 2 but no O 2 ( Schink et al, 1981a ; Schink and Ward, 1984 ). Proteiniphilum is a facultative anaerobe and potent cellulolytic bacterium that directly degrades lignocellulose to CO 2 , formate, and acetate via aerobic respiration and anaerobic fermentation ( Hahnke et al, 2016 ; Wu et al, 2020 ). Actinotalea is an anaerobic bacterium from Cellulomonadaceae family.…”

Enrichment of Anaerobic Microbial Communities from Midgut and Hindgut of Sun Beetle Larvae (Pachnoda marginata) on Wheat Straw: Effect of Inoculum Preparation

“…This ASV was more abundant in the midgut than in the hindgut enrichment cultures (Figure 4). Members of the Dysgonomonadaceae family have been reported as a recurrent family in the gut environment of insects that feed on organic matter rich in lignocellulose [20,[90][91][92][93][94][95][96][97] and in biogas reactors that run with lignocellulosic biomass as the main carbon source [98,99], suggesting an essential role in the cell wall degradation of plant cells [97,100]. Members of the genus Proteiniphilum have been described as obligate anaerobes that use proteins to produce acetic acid and propionic acid [101].…”

“…Members of the genus Proteiniphilum have been described as obligate anaerobes that use proteins to produce acetic acid and propionic acid [101]. However, Wu and collaborators [98], during an investigation of the effect of intermittent microaeration in digesters, found that this genus was able to degrade lignocellulose to acetate, formate, and carbon dioxide, by anaerobic fermentation and aerobic respiration. Dysgonomonas gadei is a facultative anaerobic species capable of converting carbohydrates such as cellobiose, fructose, lactose, starch, sucrose, and xylose into different acids but not able to produce any gas [102].…”