Reaction Pathways and Kinetics of a Cyanobacterial Neurotoxin β-N-Methylamino-L-Alanine (BMAA) during Chlorination

2017 ◽  
Vol 51 (3) ◽  
pp. 1303-1311 ◽  
Author(s):  
Yi-Ting Chen ◽  
Wan-Ru Chen ◽  
Zhi-Quan Liu ◽  
Tsair-Fuh Lin
Keyword(s):  
Reaction Pathways ◽  
Kinetics Of

scholarly journals Combustion Characteristics of Hydrochar and Pyrochar Derived from Digested Sewage Sludge

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4164 ◽  
Author(s):  
Pablo J. Arauzo ◽  
María Atienza-Martínez ◽  
Javier Ábrego ◽  
Maciej P. Olszewski ◽  
Zebin Cao ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Reaction Pathways ◽  
Energy Yield ◽  
Combustion Kinetics ◽  
Coal Blending ◽  
Carbon Recovery ◽  
And Storage ◽  
Kinetics Of ◽  
Digested Sewage Sludge ◽  
Lower Carbon

In this paper, hydrochars and pyrochars were produced at 260 °C under different residence times (2 and 4 h) using anaerobic digested sewage sludge (SSL) as initial feedstock. The effect of reaction time on the fuel properties of hydrochars and pyrochars was evaluated. Moreover, the combustion kinetics of raw SSL and the derived pyrochars and hydrochars without coal blending were determined at two different air flows (20 and 90 mL/min) and compared. In the same conditions, the yield of hydrochar was significantly lower than that of pyrochar, confirming the different reaction pathways followed in each process. The results showed hydrochars have lower carbon recovery and energy yield than pyrochars, making the latter more suitable for energy purposes. The thermogravimetric combustion study showed that both thermochemical treatments increased the ignition temperature but decreased the burnout temperature, which results in higher stability during handling and storage. However, raw SSL is better for combustion than hydrochar according to the combustibility index. In addition, the kinetic study showed that the activation energy of the combustion of biochars, especially pyrochar, is lower than that of raw SSL, which is advantageous for their combustion.

Acridone studies. XIV. The selective demethylation of 2,3-Dimethoxy-10-methyl-9-oxoacridine-1,4-quinone by base

1975 ◽  
Vol 28 (6) ◽  
pp. 1351 ◽  
Author(s):  
JR Cowan ◽  
DKC Hodgeman ◽  
RH Prager
Keyword(s):  
Sodium Hydroxide ◽  
Sodium Methoxide ◽  
Reaction Pathways ◽  
Methoxyl Group ◽  
Product Composition ◽  
Relative Extent ◽  
Kinetics Of

The selective demethylation of 2,3-dimethoxy-10-methyl-9-oxoacridine- 1,4-quinone by sodium hydroxide has been studied by following the change in product composition with hydroxide concentration, by measuring the relative extent of exchange at C2 and C3 with sodium methoxide[T], and by following the kinetics of the reaction in alkali. Reaction pathways are proposed to rationalize the observation that the C2 methoxyl group is replaced more readily in dilute alkali or on warming, but the C 3 methoxyl group is replaced in more concentrated alkali.

scholarly journals A thermodynamic model of bacterial transcription

2021 ◽  
Author(s):  
Jin Qian ◽  
David Dunlap ◽  
Laura Finzi
Keyword(s):  
Transcription Factor ◽  
Optical Tweezers ◽  
Thermodynamic Model ◽  
Reaction Pathways ◽  
Rna Structures ◽  
Nascent Transcript ◽  
Bacterial Transcription ◽  
Transcriptional Pausing ◽  
Template Dna ◽  
Kinetics Of

Transcriptional pausing is highly regulated by the template DNA and nascent transcript sequences. Here, we propose a thermodynamic model of transcriptional pausing, based on the thermal energy of transcription bubbles and nascent RNA structures, to describe the kinetics of the reaction pathways between active translocation, intermediate, backtracked, and hairpin-stabilized pauses. The model readily predicts experimentally detected pauses in high-resolution optical tweezers measurements of transcription. Unlike other models, it also predicts the effect of tension and the GreA transcription factor on pausing.

Degradation Pathway and Kinetics of Vanillin with Gordonia sp.

2012 ◽  
Vol 550-553 ◽  
pp. 2824-2827 ◽  
Author(s):  
Liping Yao ◽  
Wenzhe Song ◽  
Yuan Cai Chen
Keyword(s):  
Rate Constant ◽  
Removal Rate ◽  
Degradation Pathway ◽  
Spectroscopic Technique ◽  
Product Structure ◽  
Reaction Pathways ◽  
Order Model ◽  
First Order ◽  
Kinetics Of

This study is to discuss the reaction pathways of vanillin (3-methoxy-4-hydroxy-benzaldehyde) degradation by Gordonia sp.The product structure was analyzed by spectroscopic technique. Vanillin removal kinetics could be best described by a simple recalcitrant first order model:-dS/dt=k s,1 X(S-S∞),k s,1 is the vanillin removal rate constant.

REACTION KINETICS OF CH4 AND C2H6 WITH O2 IN EXCITED ELECTRONIC STATES: REACTION PATHWAYS AND RATE CONSTANTS

2020 ◽  
Author(s):  
V. A. Pelevkin ◽  
◽  
A. S. Sharipov ◽  
Keyword(s):  
Quantum Chemical Study ◽  
Electronic States ◽  
Chemical Study ◽  
Reaction Pathways ◽  
Fuel Reforming ◽  
Plasma Chemical ◽  
Complete Active Space ◽  
Consistent Field ◽  
Self Consistent Field ◽  
Kinetics Of

Quantum chemical study with the use of the multireference state-averaged complete active space self-consistent field approach was carried out to explore the reactions of CH4 and C2H6 molecules with O2 in different electronic states highly relevant for plasma-assisted combustion and plasma-chemical fuel reforming.

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