scholarly journals Energetics of end product excretion in anaerobic bacteria and the metabolism of fatty acids by Syntrophomonas wolfei

1986 ◽  
Author(s):  
M. J. McInerney
Keyword(s):  
Fatty Acids ◽  
Anaerobic Bacteria ◽  
Syntrophomonas Wolfei

Adhesion of Biodegradative Anaerobic Bacteria to Solid Surfaces

1999 ◽  
Vol 65 (11) ◽  
pp. 5082-5088 ◽  
Author(s):  
Paula M. van Schie ◽  
Madilyn Fletcher
Keyword(s):  
Anaerobic Bacteria ◽  
Solid Surfaces ◽  
The Other ◽  
Strictly Anaerobic ◽  
Anoxic Environments ◽  
Syntrophomonas Wolfei ◽  
Subsurface Environments ◽  
Desulfomonile Tiedjei ◽  
Glass Surfaces

ABSTRACT In order to exploit the ability of anaerobic bacteria to degrade certain contaminants for bioremediation of polluted subsurface environments, we need to understand the mechanisms by which such bacteria partition between aqueous and solid phases, as well as the environmental conditions that influence partitioning. We studied four strictly anaerobic bacteria, Desulfomonile tiedjei,Syntrophomonas wolfei, Syntrophobacter wolinii, and Desulfovibrio sp. strain G11, which theoretically together can constitute a tetrachloroethylene- and trichloroethylene-dechlorinating consortium. Adhesion of these organisms was evaluated by microscopic determination of the numbers of cells that attached to glass coverslips exposed to cell suspensions under anaerobic conditions. We studied the effects of the growth phase of the organisms on adhesion, as well as the influence of electrostatic and hydrophobic properties of the substratum. Results indicate thatS. wolfei adheres in considerably higher numbers to glass surfaces than the other three organisms. Starvation greatly decreases adhesion of S. wolfei and Desulfovibrio sp. strain G11 but seems to have less of an effect on the adhesion of the other bacteria. The presence of Fe3+ on the substratum, which would be electropositive, significantly increased the adhesion ofS. wolfei, whereas the presence of silicon hydrophobic groups decreased the numbers of attached cells of all species. Measurements of transport of cells through hydrophobic-interaction and electrostatic-interaction columns indicated that all four species had negatively charged cell surfaces and that D. tiedjei andDesulfovibrio sp. strain G11 possessed some hydrophobic cell surface properties. These findings are an early step toward understanding the dynamic attachment of anaerobic bacteria in anoxic environments.

Synbiotics impact on dominant faecal microbiota and short-chain fatty acids production in sows

2019 ◽  
Vol 366 (13) ◽  
Author(s):  
Katarzyna Śliżewska ◽  
Agnieszka Chlebicz
Keyword(s):  
Fatty Acids ◽  
Intestinal Microbiota ◽  
High Performance ◽  
Anaerobic Bacteria ◽  
Short Chain Fatty Acids ◽  
Feed Additives ◽  
Short Chain ◽  
Control Group ◽  
The Impact ◽  
Chain Fatty Acids

ABSTRACT The aim of this study was to estimate the influence of synbiotics on intestinal microbiota and its metabolism in sows. Three different synbiotics were administered with feed to animals from three experimental groups. Two groups of sows were given commercially available probiotics (BioPlus 2B®, Cylactin® LBC) as forage additives for comparison. The control group of sows was given unmodified fodder. The study was conducted for 48 days (10 days before farrowing, and continued 38 days after) and faeces samples were collected four times. The scope of this work was to designate the dominant microbiota in sows’ faeces. Therefore, the total number of anaerobic bacteria, Bifidobacterium sp., Lactobacillus sp., Bacteroides sp., Clostridium sp., Enterococcus sp., Enterobacteriaceae, Escherichia coli and yeast was determined, using the plate method. Changes in the concentration of lactic acid, short-chain fatty acids (SCFAs) and branched-chain fatty acids (BCFAs) were also determined in correlation with the feed additives administered to the sows using high-performance liquid chromatography analysis (HPLC). Our results allowed us to conclude that synbiotics have a beneficial effect on intestinal microbiota of sows and its metabolism. We observed that the impact of the synbiotics on the microbiota was more significant than the one induced by probiotics.

Odorous compounds treatment of winery and distillery effluents during natural evaporation in ponds

2005 ◽  
Vol 51 (1) ◽  
pp. 129-136 ◽  
Author(s):  
A. Bories ◽  
Y. Sire ◽  
T. Colin
Keyword(s):  
Fatty Acids ◽  
Electron Acceptor ◽  
Volatile Fatty Acids ◽  
Anaerobic Bacteria ◽  
Anaerobic Respiration ◽  
Preventive Treatment ◽  
Nitrate Addition ◽  
Tartaric Acids ◽  
Distillery Wastewater ◽  
Main Component

During treatment of winery and distillery wastewater by natural evaporation in ponds, formation of malodorous compounds induces harmful olfactory effects. In this work, we studied the origin of malodorous compounds and methods to prevent and treat odours. The formation of volatile fatty acids (VFA) from pure substrates (glycerol, lactic and tartaric acids, ethanol) and complex media (winery and distillery wastewater) was studied. Various anaerobic bacteria ferment the glycerol and produce butyric or propionic acid. Valeric and caproic acids were observed at lower concentrations than butyric and propionic acids, but their malodorous intensities were higher. Microflora produce butyric, valeric, caproic, heptanoic and octanoic acids from ethanol, the main component of winery wastewater. When nitrate (an electron acceptor) is added, catabolism leads to an anaerobic respiration phenomenon (denitrification). The organic compounds are oxidised to CO2 and the nitrate is reduced to N2 (odourless compounds), without VFA formation. The preventive treatment of odours by nitrate addition was tested on an industrial scale in winery and distillery ponds. Furthermore, the study took the effect of nitrate on VFA degradation into consideration. The results make it possible to consider using nitrate for the curative treatment of pond odours.

Sign in / Sign up

Export Citation Format

Share Document