scholarly journals Development of a simultaneous bioreactor system for characterization of gas production kinetics of methanogenic archaea at high pressure

2019 ◽  
Vol 19 (7) ◽  
pp. 537-544 ◽  
Author(s):  
Patricia Anna Pappenreiter ◽  
Sara Zwirtmayr ◽  
Lisa‐Maria Mauerhofer ◽  
Simon Karl‐Maria Rasso Rittmann ◽  
Christian Paulik
Keyword(s):  
High Pressure ◽  
Methanogenic Archaea ◽  
Gas Production ◽  
Production Kinetics ◽  
Bioreactor System ◽  
Kinetics Of

A comparison of the suitability of different models for describing the gas production kinetics of whole-crop wheat

1998 ◽  
Vol 22 ◽  
pp. 215-216
Author(s):  
A. T. Adesogan ◽  
E. Owen ◽  
D. I. Givens
Keyword(s):  
Mathematical Model ◽  
Time Course ◽  
Rumen Fluid ◽  
Gas Production ◽  
Ruminal Fermentation ◽  
Production Kinetics ◽  
Fermentation Profile ◽  
Kinetics Of

Menkeet al. (1979), Beuvinket al. (1992) and Theodorouet al. (1994) developed techniques for measuring the time course of gas production of foods fermentedin vitrowith rumen fluid. These techniques require description of the fermentation profile with an appropriate mathematical model. Although several authors have used these techniques to study the ruminal fermentation of foods, little information is available on the suitability of the model chosen for describing the fermentation profile of the food under study. In this study, the models of Ørskov and McDonald (1979), Franceet al. (1993) and Beuvink and Kogut (1993) were fitted to thein vitrogas production profiles of 10 whole-crop wheat (WCW) forages (cv.Slepjner) to determine the model most suited to describing the data.

scholarly journals Thermodynamics and high-pressure kinetics of a fast carbon dioxide fixation reaction by a (2,6-pyridinedicarboxamidato-hydroxo)nickel(ii) complex

2014 ◽  
Vol 43 (14) ◽  
pp. 5274-5279 ◽  
Author(s):  
O. Troeppner ◽  
D. Huang ◽  
R. H. Holm ◽  
I. Ivanović-Burmazović
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Transition State ◽  
Carbon Dioxide Fixation ◽  
Fixation Reaction ◽  
High Pressure Kinetics ◽  
Kinetics Of

The thermodynamics and high-pressure kinetics of the fastest CO2 fixation reaction by a metal-bound hydroxide resulted in a clear mechanistic picture and characterization of a very compact five-coordinate transition state.

scholarly journals In vitro Ruminal Gas Production Kinetics of Four Fodder Trees Ensiled With or Without Molasses and Urea

2013 ◽  
Vol 12 (7) ◽  
pp. 1234-1242 ◽  
Author(s):  
Abdelfattah ZM Salem ◽  
Chuan-she ZHOU ◽  
Zhi-liang TAN ◽  
Miguel Mellado ◽  
Moises Cipriano Salazar ◽  
...  
Keyword(s):  
Gas Production ◽  
Fodder Trees ◽  
Production Kinetics ◽  
Kinetics Of

scholarly journals Kinetic and substrate complex characterization of RamA, a corrinoid protein reductive activase from Methanosarcina barkeri

2020 ◽  
Vol 367 (17) ◽  
Author(s):  
Katherine A Huening ◽  
Ruisheng Jiang ◽  
Joseph A Krzycki
Keyword(s):  
Direct Evidence ◽  
Atp Hydrolysis ◽  
Methanogenic Archaea ◽  
Methanosarcina Barkeri ◽  
Serine Residue ◽  
Substrate Complex ◽  
Apparent Kinetic Parameters ◽  
Kinetics Of

ABSTRACT In microbial corrinoid-dependent methyltransferase systems, adventitious Co(I)-corrinoid oxidation halts catalysis and necessitates repair by ATP-dependent reductive activases. RamA, an activase with a C-terminal ferredoxin domain with two [4Fe-4S] clusters from methanogenic archaea, has been far less studied than the bacterial activases bearing an N-terminal ferredoxin domain with one [2Fe-2S] cluster. These differences suggest RamA might prove to have other distinctive characteristics. Here, we examine RamA kinetics and the stoichiometry of the corrinoid protein:RamA complex. Like bacterial activases, K+ stimulates RamA. Potassium stimulation had been questioned due to differences in the primary structure of bacterial and methanogen activases. Unlike one bacterial activase, ATP is not inhibitory allowing the first determination of apparent kinetic parameters for any corrinoid activase. Unlike bacterial activases, a single RamA monomer complexes a single corrinoid protein monomer. Alanine replacement of a RamA serine residue corresponding to the serine of one bacterial activase which ligates the corrinoid cobalt during complex formation led to only moderate changes in the kinetics of RamA. These results reveal new differences in the two types of corrinoid activases, and provide direct evidence for the proposal that corrinoid activases act as catalytic monomers, unlike other enzymes that couple ATP hydrolysis to difficult reductions.

1636 Effects of inoculum source and ammoniation on in vitro gas production kinetics of barley straw

2016 ◽  
Vol 94 (suppl_5) ◽  
pp. 796-797
Author(s):  
L. Xu ◽  
Z. X. He ◽  
P. X. Jiao ◽  
G. O. Ribeiro ◽  
V. Bremer ◽  
...  
Keyword(s):  
Gas Production ◽  
Barley Straw ◽  
Inoculum Source ◽  
Production Kinetics ◽  
In Vitro Gas Production ◽  
Kinetics Of

scholarly journals Unravelling methanogenesis in ruminants, horses and kangaroos: the links between gut anatomy, microbial biofilms and host immunity

2018 ◽  
Vol 58 (7) ◽  
pp. 1175 ◽  
Author(s):  
R. A. Leng
Keyword(s):  
Gut Microbiota ◽  
Close Association ◽  
Methanogenic Archaea ◽  
H2 Production ◽  
Gas Production ◽  
Gas Pressure ◽  
Lymphoid Cells ◽  
Lymphoid Tissues ◽  
Microbial Biofilms ◽  
Kinetics Of

The present essay aims to resolve the question as to why macropod marsupials (e.g. kangaroos and wallabies, hereinafter termed ‘macropods) and horses produce much less methane (CH4) than do ruminants when digesting the same feed. In herbivores, gases produced during fermentation of fibrous feeds do not pose a major problem in regions of the gut that have mechanisms to eliminate them (e.g. eructation in the rumen and flatus in the lower bowel). In contrast, gas pressure build-up in the tubiform forestomach of macropods or in the enlarged tubiform caecum of equids would be potentially damaging. It is hypothesised that, to prevent this problem, evolution has favoured development of controls over gut microbiota that enable enteric gas production (H2 and CH4) to be differently regulated in the forestomach of macropods and the caecum of all three species, from the forestomach of ruminants. The hypothesised regulation depends on interactions between their gut anatomy and host-tissue immune responses that have evolved to modify the species composition of their gut microbiota which, importantly, are mainly in biofilms. Obligatory H2 production during forage fermentation is, thus, captured in CH4 in the ruminant where ruminal gases are readily released by eructation, or in acetate in the macropod forestomach and equid caecum–colon where a build-up in gas pressure could potentially damage these organs. So as to maintain appropriate gut microbiota in different species, it is hypothesised that blind sacs at the cranial end of the haustral anatomy of the macropod forestomach and the equid caecum are sites of release of protobiofilm particles that develop in close association with the mucosal lymphoid tissues. These tissues release immune secretions such as antimicrobial peptides, immunoglobulins, innate lymphoid cells and mucin that eliminate or suppress methanogenic Archaea and support the growth of acetogenic microbiota. The present review draws on microbiological studies of the mammalian gut as well as other microbial environments. Hypotheses are advanced to account for published findings relating to the gut anatomy of herbivores and humans, the kinetics of digesta in ruminants, macropods and equids, and also the composition of biofilm microbiota in the human gut as well as aquatic and other environments where the microbiota exist in biofilms.

Sign in / Sign up

Export Citation Format

Share Document