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Tripathi, V. K.,Kumar, V.,Pandey, A.,Vatsa, P.,Dhasmana, A.,Singh, R. P.,Appikonda, S. H.,Hwang, I.,Lohani, M. Humana Press 2017 Molecular Neurobiology Vol. No.
<P>Expression of various cytochrome P450s (CYPs) in mammalian brain cells is well documented. However, such studies are hampered in neural/glial cells of human origin due to nonavailability of human brain cells. To address this issue, we investigated the expression and inducibility of CYP2C8 and CYP3A4 and their responsiveness against cyclophosphamide (CPA) and organophosphorus pesticide monocrotophos (MCP), a known developmental neurotoxicant in human neural (SH-SY5Y) and glial (U373-MG) cell lines. CPA induced significant expression of CYP2C8 and CYP3A4 in both types of cells in a time-dependent manner. Neural cell line exhibited relatively higher constitutive and inducible expression of CYPs than the glial cell line. MCP exposure alone could not induce the significant expression of CYPs, whereas the cells preexposed to CPA showed a significant response to MCP. Similar to the case of CPA induced expressions, neural cells were found to be more vulnerable than glial cells. Our data indicate differential expressions of CYPs in cultured human neural and glial cell lines. The findings were synchronized with protein ligand docking studies, which showed a significant modulatory capacity of MCP by strong interaction with CYP regulators-CAR and PXR. Similarly, the known CYP inducer CPA has also shown significant high docking scores with the two studied CYP regulators. We also observed a significant induction in reactive oxygen species (ROS), lipid peroxides (LPO), micronucleus (MN), chromosomal aberration (CA), and reduction in reduced glutathione (GSH) and catalase following the exposure of MCP. Moreover, the expressions of apoptotic markers such as caspase-3, caspase-9, Bax, and p53 were significantly upregulated, whereas the levels of antiapoptotic marker, Bcl2, was downregulated after the exposure of MCP in both cell lines. These findings confirm the involvement of ROS-mediated oxidative stress, which subsequently triggers apoptosis pathways in both human neural (SH-SY5Y) and glial (U373-MG) cell lines following the exposure of MCP.</P>
Dimri, M.C.,Tripathi, V.K.,Kashyap, S.C.,Jeong, Y.H.,Dube, D.C. IEEE 2009 IEEE transactions on instrumentation and measureme Vol.58 No.9
<P>A simple theoretical model is developed for studying the magnetic behavior of films at microwave frequencies, and verified experimentally on the ferrite-polymer thick-film samples. The measured values of permeability by the proposed model/technique are found to be in good agreement with the values obtained by the standard cavity perturbation technique.</P>
Kinetic Studies on Physical and Chemical Activation of Phenolic Resin Chars
Damyanti Agarwal,Darshan Lal,V.S. Tripathi,G.N. Mathur 한국탄소학회 2003 Carbon Letters Vol.4 No.3
Granular Activated Carbon (GAC) has been proven to be an excellent material for many industrial applications. A systematic study has been carried out of the kinetics of physical as well as chemical activation of phenolic resin chars. Physical activation was carried out using CO2 and chemical activation using KOH as activating agent. There are number of factors which influence the rate of activation. The activation temperature and residence time at HTT varied in the range 550~1000℃ and ½~8 hrs respectively. Kinetic studies show that the rate of chemical activation is 10 times faster than physical activation even at much lower temperature. Above study show that the chemical activation process is suitable to prepare granular activated carbon with very high surface area i.e. 2895 m2/g in short duration of time i.e. 1 to 2 hrs at lower temperature i.e. 750℃ from phenolic resins.
Kinetic Studies on Physical and Chemical Activation of Phenolic Resin Chars
Agarwal, Damyanti,Lal, Darshan,Tripathi, V.S.,Mathur, G.N. Korean Carbon Society 2003 Carbon Letters Vol.4 No.3
Granular Activated Carbon (GAC) has been proven to be an excellent material for many industrial applications. A systematic study has been carried out of the kinetics of physical as well as chemical activation of phenolic resin chars. Physical activation was carried out using $CO_2$ and chemical activation using KOH as activating agent. There are number of factors which influence the rate of activation. The activation temperature and residence time at HTT varied in the range $550{\sim}1000^{\circ}C$ and $\frac{1}{2}{\sim}8$ hrs respectively. Kinetic studies show that the rate of chemical activation is 10 times faster than physical activation even at much lower temperature. Above study show that the chemical activation process is suitable to prepare granular activated carbon with very high surface area i.e.$ 2895\;m^2/g$ in short duration of time i.e. 1 to 2 hrs at lower temperature i.e. $750^{\circ}C$ from phenolic resins.
Preparation and Charecterization of Bromofullerenes in New Stoichiometry
Mehrotra, Reema,Lal, Darshan,Tripathi, V.S.,Mathur, G.N. Korean Carbon Society 2003 Carbon Letters Vol.4 No.4
It is well established that halogenated fullerene derivatives act as synthetic intermediates for further substitution via replacement with nucleophlies. In the present work, systematic studies were carried out on the synthesis of bromofullerenes under different experimental conditions. The effect of reaction time on the product formed was observed. We observed the formation of new compound of bromofullerenes in a different stoichiometric ratio i.e., $C_{60}Br_{14}$; in addition to previous reported bromofullerenes in the stoichiometric ratio of $C_{60}Br_6$, $C_{60}Br_8$, and $C_{60}Br_{24}$. The new derivative of bromofullerene was isolated and well characterized by various analytical techniques like FT-IR, TGA, DSC, and elemental analysis. In this paper, detail of the synthesis and characterization of the bromofullerene prepared are described. The yields obtained were better than those reported previously.
Preparation and Charecterization of Bromofullerenes in New Stoichiometry
Reema Mehrotra,Darshan Lal,V.S. Tripathi,G.N. Mathur 한국탄소학회 2003 Carbon Letters Vol.4 No.4
It is well established that halogenated fullerene derivatives act as synthetic intermediates for further substitution viareplacement with nucleophlies. In the present work, systematic studies were carried out on the synthesis of bromofullerenesunder different experimental conditions. The effect of reaction time on the product formed was observed. We observed theformation of new compound of bromofullerenes in a different stoichiometric ratio i.e., C60Br14; in addition to previousreported bromofullerenes in the stoichiometric ratio of C60Br6, C60Br8, and C60Br24. The new derivative of bromofullerene wasisolated and well characterized by various analytical techniques like FT-IR, TGA, DSC, and elemental analysis. In this paper,detail of the synthesis and characterization of the bromofullerene prepared are described. The yields obtained were better thanthose reported previously.