On the comprehensive role of thermodynamic and kinetic factors in pyrolysis reaction systems

1986 ◽  
Vol 83 ◽  
pp. 1-6 ◽  
Author(s):  
Zou Renjun
Keyword(s):  
Reaction Systems ◽  
Pyrolysis Reaction

Role of pyrolysis reaction temperature and heating-rate in the growth and morphology of carbon nanostructures

2017 ◽  
Vol 12 ◽  
pp. 229-238 ◽  
Author(s):  
Rajeev Kumar ◽  
Rajmohan Rajendiran ◽  
Harish Kumar Choudhary ◽  
Naveen Kumar G.M. ◽  
Badimela Balaiah ◽  
...  
Keyword(s):  
Heating Rate ◽  
Reaction Temperature ◽  
Carbon Nanostructures ◽  
Pyrolysis Reaction

scholarly journals Role of thylakoid membranes in oxygenic photosynthesis: A comparative perspective using murburn concept

2020 ◽  
Author(s):  
Kelath Murali Manoj ◽  
Daniel Andrew Gideon ◽  
Abhinav Parashar ◽  
Deepak Haarith ◽  
Afsal Manekkathodi
Keyword(s):  
Lipid Membranes ◽  
Biological Membrane ◽  
Thylakoid Membranes ◽  
Oxygenic Photosynthesis ◽  
Evolutionary Significance ◽  
Reaction Systems ◽  
Membrane Interfaces ◽  
Gradient Based ◽  
Electron Group

Murburn concept is a new redox metabolic paradigm which advocates that several redox enzymes generate/stabilize diffusible reactive (oxygen) species (DRS or DROS) to carry out useful electron/moiety transfer reactions at biological membrane interfaces (Manoj 2020a). Herein, we show that the components and principles of redox reactions within chloroplasts/cyanobacteria share several similarities with soluble and simple extracellular or peroxisomal heme-enzymes that carry out electron/group transfer. We explore the comparison in detail with membrane-embedded and complex systems that catalyze: (i) microsomal xenobiotic metabolism and (ii) mitochondrial oxidative phosphorylation. We point out that the murburn interpretations of catalytic phenomena are consistent through the various reaction systems cited above. Further, we argue that evolutionary constraints and the physiological restrictions of neutral pH ranges discount proton-gradient based explanations for bioenergetic phosphorylations in chloroplasts. Therefore, we propose that the highly packed thylakoid membranes with minute aqueous volumes serve to enhance the lifetimes of oxygen-centered radicals and intermediates. The murburn perspective could also potentially explain protein supercomplexes in chloroplasts, and generation of ATP in mitochondria by photo-activation. Our proposal also highlights the evolutionary significance of lipid membranes and utility of oxygen in diverse life processes.

scholarly journals Enhanced Photocatalytic and Antimicrobial Performance of Cuprous Oxide/Titania: The Effect of Titania Matrix

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2069 ◽  
Author(s):  
Marcin Janczarek ◽  
Maya Endo ◽  
Dong Zhang ◽  
Kunlei Wang ◽  
Ewa Kowalska
Keyword(s):  
Cuprous Oxide ◽  
Low Cost ◽  
Antimicrobial Properties ◽  
Solar Irradiation ◽  
Photocatalytic Efficiency ◽  
Methanol Dehydrogenation ◽  
Reaction Systems ◽  
Antimicrobial Performance ◽  
Uv Visible

A simple, low-cost method was applied to prepare hybrid photocatalysts of copper (I) oxide/titania. Five different TiO2 powders were used to perform the study of the effect of titania matrix on the photocatalytic and antimicrobial properties of prepared nanocomposites. The photocatalytic efficiency of such a dual heterojunction system was tested in three reaction systems: ultraviolet-visible (UV-Vis)-induced methanol dehydrogenation and oxidation of acetic acid, and 2-propanol oxidation under visible light irradiation. In all the reaction systems considered, the crucial enhancement of photocatalytic activity in relation to corresponding bare titania was observed. The reaction mechanism for a specific reaction and the influence of titania matrix were discussed. Furthermore, antimicrobial (bactericidal and fungicidal) properties of Cu2O/TiO2 materials were analyzed. The antimicrobial activity was found under UV, visible and solar irradiation, and even for dark conditions. The origin of antimicrobial properties with emphasis on the role of titania matrix was also discussed.

Enzymatic transformation of flavonoids and terpenoids: Structural and functional diversity of the novel derivatives

2010 ◽  
Vol 82 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Epameinondas Xanthakis ◽  
Eleni Theodosiou ◽  
Sophia Magkouta ◽  
Haralambos Stamatis ◽  
Heleni Loutrari ◽  
...  
Keyword(s):  
Enzymatic Synthesis ◽  
Functional Foods ◽  
Biological Function ◽  
Biological Activities ◽  
Perillyl Alcohol ◽  
The Novel ◽  
Reaction Systems ◽  
Enzymatic Transformation ◽  
Enzymatic Acylation

Flavonoids and terpenoids are promising candidates for use as functional foods and novel therapeutics due to their prominent biological activities. However, the use of several bioactive plant compounds is limited by low stability and solubility problems. This review underlines the feasibility of enzymatic synthesis of novel bioactive analogs of selected flavonoids (silybin, rutin) and terpenoids (perillyl alcohol, POH) in nonconventional reaction systems. The effect of various parameters on the enzymatic acylation and/or glucosylation of these phytochemicals was studied. Also, the role of the structure of the novel molecules in relation to their biological function was investigated in various cancer cell lines.

Encoding Threshold Boolean Networks into Reaction Systems for the Analysis of Gene Regulatory Networks

2021 ◽  
Vol 179 (2) ◽  
pp. 205-225
Author(s):  
Roberto Barbuti ◽  
Pasquale Bove ◽  
Roberta Gori ◽  
Damas Gruska ◽  
Francesca Levi ◽  
...  
Keyword(s):  
Gene Regulatory Networks ◽  
Regulatory Networks ◽  
Boolean Network ◽  
Reaction System ◽  
Boolean Networks ◽  
Specific Cell ◽  
Reaction Systems ◽  
Gene Regulatory ◽  
Closed Reaction System

Gene regulatory networks represent the interactions among genes regulating the activation of specific cell functionalities and they have been successfully modeled using threshold Boolean networks. In this paper we propose a systematic translation of threshold Boolean networks into reaction systems. Our translation produces a non redundant set of rules with a minimal number of objects. This translation allows us to simulate the behavior of a Boolean network simply by executing the (closed) reaction system we obtain. This can be very useful for investigating the role of different genes simply by “playing” with the rules. We developed a tool able to systematically translate a threshold Boolean network into a reaction system. We use our tool to translate two well known Boolean networks modelling biological systems: the yeast-cell cycle and the SOS response in Escherichia coli. The resulting reaction systems can be used for investigating dynamic causalities among genes.

Methane adsorption and dissociation on iron oxide oxygen carriers: the role of oxygen vacancies

2016 ◽  
Vol 18 (24) ◽  
pp. 16423-16435 ◽  
Author(s):  
Zhuo Cheng ◽  
Lang Qin ◽  
Mengqing Guo ◽  
Jonathan A. Fan ◽  
Dikai Xu ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Methane Conversion ◽  
Oxygen Vacancies ◽  
Oxygen Carrier ◽  
Methane Adsorption ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Reaction Systems ◽  
Adsorption And Dissociation

We investigated the interaction between methane and iron oxide oxygen carrier for chemical looping reaction systems and found the oxygen vacancies can facilitate methane conversion.

The Role of Electrical and Volume Transport in Heterogeneous Reaction Systems

1975 ◽  
Vol 30 (1-2) ◽  
pp. 127-128
Author(s):  
E. Kahrig ◽  
H. Beßerdich ◽  
E. Brecht ◽  
D. Kirstein
Keyword(s):  
Kinetic Parameters ◽  
Electrical Transport ◽  
Heterogeneous Reaction ◽  
Volume Transport ◽  
Concentration Profiles ◽  
Reaction Systems ◽  
Transport Measurements

Abstract For autocatalysis coupled with diffusion the local periodic concentration profiles are influenced essentially by electrical transport and convection. When diffusion is negligible for Michaelis-Menten-kinetics equations are given to determine the kinetic parameters Vmax and Km from transport measurements.

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