Fe Overload and Ascorbyl Radical Steady State Concentration in Rat Brain | Chapter 01 | Issues and Developments in Medicine and Medical Research Vol. 4

 The ascorbyl radical is produced by the one-electron oxidation of ascorbate, and it has been proposed as a marker of oxidative stress in vitro and in vivo in a variety of systems. We were able to estimate the steady state concentration of using a simple kinetic analysis. These findings were compared to experimental values obtained in the rat brain under physiological conditions and in response to stress caused by subchronic Fe overload. The major goal of this chapter is to expand on the information offered in a previously published work by applying a basic kinetic model created to estimate steady state concentration to other Fe-dependent oxidative situations in the rat brain to other Fe-dependent oxidative conditions. Acute Fe-overload appears to alter steady-state concentration via a more complex route network than sub-chronic Fe-overload, according to this data. The mechanisms that govern living organisms' responses to toxicologically relevant challenges will be better understood thanks to the mechanistic investigation given here.

Author(S) Details

Natacha E. Piloni
Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Fisicoquímica, Buenos Aires, Argentina and CONICET-Universidad de Buenos Aires, Instituto de Bioquímica y Medicina Molecular (IBIMOL), Buenos Aires, Argentina.

Susana Puntarulo
Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Fisicoquímica, Buenos Aires, Argentina and CONICET-Universidad de Buenos Aires, Instituto de Bioquímica y Medicina Molecular (IBIMOL), Buenos Aires, Argentina.

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Kinetic Study and Model Development for Cumulative Biogas Production from Cattle Dung | Chapter 5 | Advanced Aspects of Engineering Research Vol. 15

 Methane, carbon dioxide, and traces of numerous trace elements make up biogas. It is produced by the anaerobic digestion of organic materials such as cattle manure, and it is influenced by a number of factors that affect the population and activity of the bacteria that produce biogas. One of the many factors that influences biogas production from cattle manure is temperature.

At temperatures ranging from 35°C to 55°C, with each step of 5°C, the influence of temperature on biogas production from cattle dung was tested. A mathematical model developed in this work is used to assess the effect of temperature on the rate of biogas production from cattle manure.

To develop the new mathematical model, the temperature influence is added to the modified Gompertz model. At temperatures ranging from 35°C to 55°C, the new model was found to be capable of predicting biogas production from cattle manure. The new model's results are found to be substantially connected with the current study's experimental data.

Author (S) Details

Dr. Manjula Das Ghatak
Department of Mechanical Engineering, NIT Arunachal Pradesh, Yupia, Papum Pare, India.

Prof. Pinakeswar Mahanta
Department of Mechanical Engineering, IIT Guwahati, North Guwahati, Assam, India.

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Dual- and 3-wavelength Controlled Photopolymerization Confinement for 3D-Printing: Kinetics and Analysis | Chapter 10 | Current Advances in Chemistry and Biochemistry Vol. 5

 The kinetics and dynamic profiles of monomer conversion for blue-light only, 2-light (red and UV), and 3-light (red, blue, UV) are shown for diverse conditions. Higher oxygen concentration leads to lesser conversion, which can be improved by lowering S-inhibition via pre-irradiation with red or blue light. The conversion rate of the UV-only system is lower than that of the blue-only system. However, dual-light (blue and UV) could boost conversion, and red-light pre-irradiation could boost it even more. N-inhibition and S-inhibition, two competing variables, could be modified separately and selectively to achieve: (i) efficient PC begun by UV-light created N-inhibition for low confinement thickness and high print speed; and (ii) high conversion of blue-light (without UV-light), augmented by red-light pre-irradiation for low S-inhibition. Due to various C=C bond rate constants and conversion efficacies, the UV-light induced inhibitory effect for a dual-wavelength (UV and blue) is substantially monomer-dependent. Without UV light, increased initiator concentration and rate constant lead to higher conversion for a given blue-light intensity. Blue-only conversion is substantially higher than UV-only and UV-blue combination conversion. A tertiary amine co-initiator and butyl nitrite are used in the UV-light controlled methacrylate conversion of a glycidyl dimethacrylate resin, for example. The system is exposed to a continuous blue light, but just an on-off exposure to UV radiation. Finally, we created a theoretical novel finding for the criterion of a good material/candidate, [I₂₀C₂₀]/ [I₁₀C₁₀], which is governed by a double ratio of light intensity and concentration.

Author(s) Details

Jui-Teng Lin
New Vision, Inc. New Taipei City 242 Taiwan, ROC.

Kuo-Ti Chen
Jin-Dynamic Intelligets Co. E Xingyuan Rd, Nanfeng Town, Suzhou City, Jiangsu province, China.

Da-Chuan Cheng
Department of Biomedical Imaging and Radiological Science, China Medical University, 404, Taiwan, ROC.

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