scholarly journals Strategy for Rapid Recovery of Simultaneous Sulfide and Nitrite Removal under High Substrate Inhibition

2021 ◽  
Author(s):  
Kaiquan Wang ◽  
Mahmood Qaisar ◽  
Bilong Chen ◽  
Siyi Liu ◽  
Yuanyuan Wu ◽  
...  
Keyword(s):  
Substrate Concentration ◽  
Substrate Inhibition ◽  
Process Research ◽  
Sulfide Concentration ◽  
High Substrate Concentration ◽  
Short Term ◽  
High Substrate ◽  
Quick Recovery ◽  
Nitrite Removal ◽  
High Sulfide

Abstract The paper deals with the strategy for a quick recovery of reactor treating sulfide and nitrite simultaneously under inhibition caused by high substrate concentration. For influent sulfide concentration of 360 mg S/L, respective sulfide and nitrite removal percentages dropped to 74.19% and 14.33% due to inhibition caused by high sulfide and nitrite concentrations. It was found that reduction in the influent substrate concentration (300 mg S/L) could not revive the nitrite removal performance in 4 days’ operation, which still showed a declining tendency from 47.16–18.52%. Regulating the influent pH around 6.70 ± 0.10, it only took 4 days to recover the performance for 300 mg S/L. Furthermore, at influent sulfide concentration increased to 360 mg S/L, respective sulfide and nitrite removal percentages were 99.76 ± 0.27% and 100%. The strategy of regulating influent pH could recover the process performance in a short term, which would provide great convenience for subsequent process research.

scholarly journals Lack of deviation from Michaelis–Menten kinetics for pig heart fumarase

1980 ◽  
Vol 189 (3) ◽  
pp. 653-654 ◽  
Author(s):  
B Andersen
Keyword(s):  
Steady State ◽  
Substrate Concentration ◽  
Substrate Inhibition ◽  
High Substrate Concentration ◽  
High Substrate ◽  
Steady State Kinetics ◽  
Km Value ◽  
Kinetics Of

Studies of steady-state kinetics of fumarase in the usual substrate-concentration range from 0.1 Km to 10 Km and in the high substrate-concentration range from 10 Km to 200 Km are described. The purpose is to investigate reports of substrate inhibition and oscillatory kinetics. In the normal substrate-concentration range, no deviations from hyperbolic kinetics were found, and in the extended concentration range, up to more than 200 times the Km value, no substrate inhibition was demonstrated. A discussion of the discrepancies between the mentioned reports of deviations from the hyperbolic kinetics and the present findings is given.

Enhanced thermostability and tolerance of high substrate concentration of an esterase by directed evolution

2004 ◽  
Vol 27 (4-6) ◽  
pp. 169-175 ◽  
Author(s):  
Ji-Heui Kim ◽  
Gi-Sub Choi ◽  
Seung-Bum Kim ◽  
Won-Ho Kim ◽  
Jin-Young Lee ◽  
...  
Keyword(s):  
Directed Evolution ◽  
Substrate Concentration ◽  
High Substrate Concentration ◽  
High Substrate

scholarly journals N-Halosuccinimides as Precatalysts for C-, N-, O-, and X-Nucleophilic Substitution Reactions of Alcohols under Mild Reaction Conditions

Catalysts ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 460
Author(s):  
Njomza Ajvazi ◽  
Stojan Stavber
Keyword(s):  
Nucleophilic Substitution ◽  
Substrate Concentration ◽  
Solvent Free ◽  
Substitution Reactions ◽  
High Substrate Concentration ◽  
Reaction Conditions ◽  
High Substrate ◽  
Nucleophilic Substitution Reactions ◽  
Solvent Free Reaction

N-halosuccinimides (chloro, bromo, and iodo, respectively) were introduced, tested, and applied as efficient and non-metal precatalysts for C-, N-, O-, and X-nucleophilic substitution reactions of alcohols under solvent-free reaction conditions (SFRC) or under high substrate concentration reaction conditions (HCRC) efficiently and selectively, into the corresponding products.

scholarly journals Synthesis and oxidation of aminoalkyl-onium compounds by pig kidney diamine oxidase

1971 ◽  
Vol 122 (4) ◽  
pp. 557-567 ◽  
Author(s):  
W. G. Bardsley ◽  
J. S. Ashford ◽  
C. M. Hill
Keyword(s):  
Substrate Concentration ◽  
Diamine Oxidase ◽  
Amino Group ◽  
High Substrate Concentration ◽  
High Substrate ◽  
Pig Kidney ◽  
Substrate Interaction ◽  
Enzyme Substrate ◽  
Potent Inhibition

1. The preparation of a series of compounds derived from diamines by replacing one amino group by a dimethylsulphonium, isothiuronium, trimethylammonium, NN′-dimethylimidazolium or N-methylpyridinium species is described. 2. The behaviour of these compounds as substrates of pig kidney diamine oxidase is reported. All but the trimethylammonium compounds proved to be substrates. 3. Many of these compounds showed potent inhibition at high substrate concentration and this was studied. 4. On the basis of these and other observations a scheme for enzyme–substrate interaction is suggested.

scholarly journals Effect of Substrate Feeding Concentration on Initial Biofilm Development in Anaerobic Hybrid Reactor

2017 ◽  
Vol 20 (3&4) ◽  
pp. 361-372
Author(s):  
B. Suraraksa ◽  
A. Nopharatana ◽  
P. Chaiprasert ◽  
S. Bhumiratana ◽  
M. Tanticharoen
Keyword(s):  
High Glucose ◽  
Glucose Concentration ◽  
Substrate Concentration ◽  
Early Stage ◽  
Hybrid Reactor ◽  
High Glucose Concentration ◽  
High Substrate Concentration ◽  
High Substrate ◽  
Low Glucose ◽  
Biofilm Development

To elucidate the effect of substrate concentration on biofilm development, glucose concentrations of 500 and 1,000 mg/L were used.  At an early stage, biofilm development at both concentrations was not significantly different (P=0.621).  After removing suspended biomass at 24 operational hours, the biofilm development at high substrate concentration was higher than at lower concentration.  At 72 operational hours, the amounts of attached biomass at low and high glucose feeding were 9.04±1.17 and 28.58±2.72 g VSS/m2, respectively.  The activities of acidogens, acetogens, and methanogens at the low glucose concentration were 0.334, 0.016 and 0.003 g COD/g VSS/h, and those at the high glucose concentration were 0.145, 0.003 and 0.001 g COD/g VSS/h, respectively.  Moreover, the ratio of methanogenic activity at low glucose concentration was higher than at high glucose concentration.  The glucose utilization at low and high feeding concentrations was 33% and 27%, respectively.  These results indicated that rapid biofilm development by using high substrate concentration would be less beneficial if unbalance of methanogenic ratio was found in biofilm.

Enantioselective Reduction of 4-Fluoroacetophenone at High Substrate Concentration using a Tailor-Made Recombinant Whole-Cell Catalyst

2007 ◽  
Vol 349 (4-5) ◽  
pp. 709-712 ◽  
Author(s):  
Harald Gröger ◽  
Claudia Rollmann ◽  
Francoise Chamouleau ◽  
Isabelle Sebastien ◽  
Oliver May ◽  
...  
Keyword(s):  
Substrate Concentration ◽  
High Substrate Concentration ◽  
Whole Cell ◽  
High Substrate ◽  
Enantioselective Reduction
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