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Study of a novel phenolic-ester as antioxidant additive in lube, biodiesel and blended diesel
Raj K. Singh,Aruna Kukrety,Om P. Sharma,Siddharth Baranwal,Neeraj Atray,Siddharth S. Ray 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
A novel phenolic-ester denoted as Bz–4–tBz was synthesized by esterification reaction between the1,2,4,5-benzenetetracarboxylic acid and 3,5-di-tert-butyl-4-hydroxybenyl alcohol in N,N0-dimethyla-cetamide using N,N0-dicyclohexylcarbodiimide as catalyst. The Bz–4–tBz was evaluated as antioxidantin polyol by the rotatory bomb oxidation test while the Rancimat test were also done for evaluating theantioxidant potential in the biodiesel (B100) and blended diesel (B20). The RBOT time of polyol wasobserved to be increased from 6.72 min to 17.42 min when blended 2000 mg/kg Bz–4–tBz in it. Theoxidation stability of biodiesel (B100) and blended diesel (B20) was also found to be increased.
COMMON FIXED POINT RESULTS VIA F-CONTRACTION ON C<sup>*</sup> -ALGEBRA VALUED METRIC SPACES
Shivani Kukreti,Gopi Prasad,Ramesh Chandra Dimri The Kangwon-Kyungki Mathematical Society 2023 한국수학논문집 Vol.31 No.4
In this work, we establish common fixed point results by utilizing a variant of F-contraction in the framework of C<sup>*</sup>-algebra valued metric spaces. We utilize E.A. and C.L.R. property possessed by the mappings to prove common fixed point results in the same metric settings. To validate the applicability of these common fixed point results, we provide illustrative examples too.
FIXED POINTS OF SET-VALUED MAPPINGS IN RELATIONAL METRIC SPACES
( Gopi Prasad ),( Ramesh Chandra Dimri ),( Shivani Kukreti ) 한국수학교육학회 2021 純粹 및 應用數學 Vol.28 No.3
In this paper, we generalize the notion of comparable set-valued mappings by introducing two types of R-closed set-valued mappings and utilize these to obtain an analogue of celebrated Mizoguchi and Takahashi fixed point theorem in relational metric spaces. To annotate the claims and usefulness of such findings, we prove fixed point results for both set-valued and single-valued mappings and validate the assertions with the help of examples. In this way, these investigations extend, modify and generalize some prominent recent fixed point results obtained by Tiammee and Suantai [24], Amini-Harandi and Emami [4], Prasad and Dimri [19] and several others in the settings of relational metric spaces.
( Sagar Verma ),( Priyanka Singh ),( Shiffali Khurana ),( Nirmal Kumar Ganguly ),( Ritushree Kukreti ),( Luciano Saso ),( Devinder Singh Rana ),( Vibha Taneja ),( Vinant Bhargava ) 대한신장학회 2021 Kidney Research and Clinical Practice Vol.40 No.2
Moderate levels of endogenous reactive oxygen species (ROS) are important for various cellular activities, but high levels lead to toxicity and are associated with various diseases. Levels of ROS are maintained as a balance between oxidants and antioxidants. Accumulating data suggest that oxidative stress is a major factor in deterioration of renal function. In this review, we highlight the possible mechanism by which oxidative stress can lead to chronic kidney disease (CKD). This review also describes therapies that counter the effect of oxidative stress in CKD patients. Numerous factors such as upregulation of genes involved in oxidative phosphorylation and ROS generation, chronic inflammation, vitamin D deficiency, and a compromised antioxidant defense mechanism system cause progressive detrimental effects on renal function that eventually lead to loss of kidney function. Patients with renal dysfunction are highly susceptible to oxidative stress, as risk factors such as diabetes, renal hypertension, dietary restrictions, hemodialysis, and old age predispose them to increased levels of ROS. Biomolecular adducts (DNA, proteins, and lipids) formed due to reaction with ROS can be used to determine oxidative stress levels. Based on the strong correlation between oxidative stress and CKD, reversal of oxidative stress is being explored as a major therapeutic option. Xanthine oxidase inhibitors, dietary antioxidants, and other agents that scavenge free radicals are gaining interest as treatment modalities in CKD patients.