scholarly journals Stabilization Factors for Propionate Oxidation in Methanogenic Process Treating Artificial Wastewater

2010 ◽  
Vol 33 (9) ◽  
pp. 147-150 ◽  
Author(s):  
Nobuo KAKU ◽  
Toshikazu UTTANAI ◽  
Shino HASEGAWA ◽  
Atsuko UEKI ◽  
Katsuji UEKI
Keyword(s):  
Propionate Oxidation ◽  
Methanogenic Process

Effect of Short-Term Temperature Increase on the Performance of a Mesophilic UASB Reactor

1990 ◽  
Vol 22 (9) ◽  
pp. 183-190 ◽  
Author(s):  
J. B. van Lier ◽  
J. Rintala ◽  
J. L. Sanz Martin ◽  
G. Lettinga
Keyword(s):  
Sharp Decrease ◽  
Methanogenic Bacteria ◽  
Decay Rates ◽  
Uasb Reactor ◽  
Short Term ◽  
Retention Capacity ◽  
Temperature Shock ◽  
Biomass Retention ◽  
Propionate Oxidation ◽  
Ph Decrease

A study was carried out to assess the effects of short-term temperature increments on the treatment efficiency and methane production of UASB reactors at a working temperature of 37-39°C. Two different substrates were used to determine the effects on the several bacterial groups involved in the digestion process. One reactor was fed with defined synthetic acidified wastewater the other with unacidified wastewaler from a distillery process. Shocks of 5-24 hrs were applied at temperatures in the range of 45 to 61°C. Up to 45°C no detrimental effects were noticeable. Higher temperatures led to a sharp decrease of the activity of the different microbial populations as a result of elevated decay rates. Propionate oxidation turned out to be the most sensitive for temperature increments, whereas the acidogenic bacteria were least affected. Temperature shocks of 55 and 61°C led to a decrease of 50% of the overall efficiency after 10 and 3 hrs, respectively. By means of batch experiments decay rates of 0.44 and > 10 hr −1 of the methanogenic bacteria were estimated at 55 and 65°C respectively. As temporary inactivation of the mesophilic bacteria during a temperature shock was found to be unlikely, reactor recovery is dependent on the bacterial growth and the biomass retention capacity of the reactor. When unacidified wastewater is treated, a pH decrease has to be considered during a temperature shock.

scholarly journals 1-13C-propionate breath testing as a surrogate endpoint to assess efficacy of liver-directed therapies in methylmalonic acidemia (MMA)

2021 ◽  
Author(s):  
Irini Manoli ◽  
Alexandra R. Pass ◽  
Elizabeth A. Harrington ◽  
Jennifer L. Sloan ◽  
Jack Gagné ◽  
...  
Keyword(s):  
Clinical Laboratory ◽  
Oxidative Capacity ◽  
Methylmalonic Acidemia ◽  
Cognitive Test ◽  
Therapeutic Effects ◽  
Transplant Recipients ◽  
Mineral Density ◽  
Link Type ◽  
Breath Testing ◽  
Propionate Oxidation

Abstract Purpose To develop a safe and noninvasive in vivo assay of hepatic propionate oxidative capacity. Methods A modified 1-13C-propionate breath test was administered to 57 methylmalonic acidemia (MMA) subjects, including 19 transplant recipients, and 16 healthy volunteers. Isotopomer enrichment (13CO2/12CO2) was measured in exhaled breath after an enteral bolus of sodium-1-13C-propionate, and normalized for CO2 production. 1-13C-propionate oxidation was then correlated with clinical, laboratory, and imaging parameters collected via a dedicated natural history protocol. Results Lower propionate oxidation was observed in patients with the severe mut0 and cblB subtypes of MMA, but was near normal in those with the cblA and mut− forms of the disorder. Liver transplant recipients demonstrated complete restoration of 1-13C-propionate oxidation to control levels. 1-13C-propionate oxidation correlated with cognitive test result, growth indices, bone mineral density, renal function, and serum biomarkers. Test repeatability was robust in controls and in MMA subjects (mean coefficient of variation 6.9% and 12.8%, respectively), despite widely variable serum methylmalonic acid concentrations in the patients. Conclusion Propionate oxidative capacity, as measured with 1-13C-propionate breath testing, predicts disease severity and clinical outcomes, and could be used to assess the therapeutic effects of liver-targeted genomic therapies for MMA and related disorders of propionate metabolism. TRIAL REGISTRATION This clinical study is registered in www.clinicaltrials.gov with the ID: NCT00078078. Study URL: http://clinicaltrials.gov/ct2/show/NCT00078078

Propionate oxidation in Escherichia coli

1967 ◽  
Vol 121 (2) ◽  
pp. 440-442 ◽  
Author(s):  
Warner S. Wegener ◽  
Henry C. Reeves ◽  
Samuel J. Ajl
Keyword(s):  
Escherichia Coli ◽  
Propionate Oxidation

Nanoferrosonication: A novel strategy for intensifying the methanogenic process in sewage sludge

2019 ◽  
Vol 276 ◽  
pp. 318-324 ◽  
Author(s):  
Alfredo Córdova Lizama ◽  
Cristian Carrera Figueiras ◽  
Liliana Alzate Gaviria ◽  
Alejandro Zepeda Pedreguera ◽  
Juan Enrique Ruiz Espinoza
Keyword(s):  
Sewage Sludge ◽  
Novel Strategy ◽  
Methanogenic Process

Microbial colonization of different support materials used to enhance the methanogenic process

1994 ◽  
Vol 41 (4) ◽  
pp. 480-486
Author(s):  
J. M. Sanchez ◽  
S. Arijo ◽  
M. A. Mu�oz ◽  
M. A. Mori�igo ◽  
J. J. Borrego
Keyword(s):  
Microbial Colonization ◽  
Support Materials ◽  
Materials Used ◽  
Methanogenic Process
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