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Ahmad, Bashir,Rizwan, Muhammad,Rauf, Abdur,Raza, Muslim,Azam, Sadiq,Bashir, Shumaila,Molnar, Joseph,Csonka, Akos,Szabo, Diana Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.4
A new compound namely (13-(3,3-dihydroxypropyl)-1,6-dihydroxy-3,4-dihydro-1H-isochromen-8(5H)-one (1) was isolated from an ethyl acetate extract of the borne fungi Screlotium rolfsii. Its chemical structure was elucidated by spectroscopic analysis. Screlotiumol 1 were evaluated for their effects on the reversion of multidrug resistant (MDR) mediated by P-glycoprotein (P-gp) of the soil borne fungi. The multidrug resistant P-glycoprotein is a target for chemotherapeutic drugs in cancer cells. In the present study rhodamine-123 exclusion screening test on human mdr1 gene transfected mouse gene transfected L5178 and L5178Y mouse T-cell lymphoma which showed excellent MDR reversing effect in a dose dependent manner against mouse T-lymphoma cell line. Moreover, molecular docking studies of compound-1 also showed better results as compared with the standard. Therefore the preliminary results obtained from this study suggest that screlotiumol 1 could be used as a potential agent for the treatment of cancer.
Shakoor, Muhammad Bilal,Nawaz, Rab,Hussain, Fida,Raza, Maimoona,Ali, Shafaqat,Rizwan, Muhammad,Oh, Sang-Eun,Ahmad, Sajjad Elsevier 2017 Science of the Total Environment Vol.601 No.-
<P><B>Abstract</B></P> <P>Arsenic (As) is a naturally occurring metalloid and Class-A human carcinogen. Exposure to As via direct intake of As-contaminated water or ingestion of As-contaminated edible crops is considered a life threatening problem around the globe. Arsenic-laced drinking water has affected the lives of over 200 million people in 105 countries worldwide. Limited data are available on various health risk assessment models/frameworks used to predict carcinogenic and non-carcinogenic health effects caused by As-contaminated water. Therefore, this discussion highlights the need for future research focusing on human health risk assessment of individual As species (both organic and inorganic) present in As-contaminated water. Various conventional and latest technologies for remediation of As-contaminated water are also reviewed along with a discussion of the fate of As-loaded waste and sludge.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Arsenic is recognized as a Class-A human carcinogen. </LI> <LI> Groundwater As contamination has affected over 200 million people worldwide. </LI> <LI> This paper reviews current knowledge regarding As in the environment. </LI> <LI> A critical assessment of remediation of contaminated water is presented. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
MUHAMMAD SALEEM,M. ASHFAQ AHMAD,RIZWAN RAZA,S. J. XUE,L. FANG,F. WU,W. J. LI,C. L. XU,L. HU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.6
Zinc oxide (ZnO) nanowire (NW) ¯lms were synthesized at low temperature (95?C) throughamine-assisted solution process and used as photoanode for the fabrication of dye-sensitized solarcells (DSSCs). It was found that with the addition of polyethyleneimine (PEI) and ammoniumhydroxide (NH 4 OH) in growth solution, the NWs were smaller in diameter and longer in lengthby prolonging the growth time without refreshing the growth solution. A reasonable overallconversion e±ciency of 1.25% was achieved with photoanode based on ZnO NWs containing PEIand NH 4 OH. However, DSSC fabricated with ZnO NWs not containing PEI and NH 4 OH showedlow conversion e±ciency of 0.58%. All the DSSCs exhibited almost similar values of open circuitvoltage ( V OC) and ¯ll factor (FF). Interestingly, DSSC based on ZnO NWs with PEI and NH 4 OHobtained two times higher short circuit current density ( J SC) compared to ZnO NWs photoanodewithout PEI and NH 4 OH. The increase in e±ciency and J SC with the length of NWs is attributedto the increase in internal surface area for su±cient dye loading and light harvesting.
Arshad, Javeria,Janjua, Naveed Kausar,Raza, Rizwan The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.1
The new emerging "High entropy materials" attract the attention of the scientific society because of their simpler structure and spectacular applications in many fields. A novel nanocrystalline high entropy (Be,Mg,Ca,Sr,Zn,Ni)3O4 oxide has been successfully synthesized through mechanochemical treatment followed by sintering and air quenching. The present research work focuses on the possibility of single-phase formation in the aforementioned high entropy oxide despite the great difference in the atomic sizes of reactant alkaline earth and 3d transition metal oxides. Structural properties of (Be,Mg,Ca,Sr,Zn,Ni)3O4 high entropy oxide were explored by confirmation of its single-phase Fd-3m spinel structure by x-ray diffraction (XRD). Further, nanocrystalline nature and morphology were analyzed by scanning electron microscopy (SEM). Among thermal properties, thermogravimetric analysis (TGA) revealed that the (Be,Mg,Ca,Sr,Zn,Ni)3O4 high entropy oxide is thermally stable up to a temperature of 1200℃. Whereas phase evolution in (Be,Mg,Ca,Sr,Zn,Ni)3O4 high entropy oxide before and after sintering was analyzed through differential scanning calorimetry (DSC). Electrochemical studies of (Be,Mg,Ca,Sr,Zn,Ni)3O4 high entropy oxide consists of a comparison of thermodynamic and kinetic parameters of water and hydrazine hydrate oxidation. Values of activation energy for water oxidation (9.31 kJ mol-1) and hydrazine hydrate oxidation (13.93 kJ mol-1) reveal that (Be,Mg,Ca,Sr,Zn,Ni)3O4 high entropy oxide is catalytically more active towards water oxidation as compared to that of hydrazine hydrate oxidation. Electrochemical impedance spectroscopy is also performed to get insight into the kinetics of both types of reactions.
Nazar Kashif,Jaffery Mujtaba Hussain,Shakir Imran,Nazar Atif,Raza Rizwan 한국물리학회 2022 Current Applied Physics Vol.40 No.-
This paper demonstrates the mathematical and MATLAB simulation model of 1 KW (28.8Vdc) PEM fuel cell system with boost convertor and RL load to analyze the yield behavior in accordance to control the hydrogen fuel utilization. Two cases have been designed to evaluate the performance of this model. In the first case, fuel cell parameters are examined with and without a fuel regulator that controls the hydrogen fuel rate while in the second case, the operating temperature of a fuel cell stack is varied to observe the impact on the system. PEM fuel cell based power systems can become an alternate choice in the transportation sector to overcome contamination concerns, especially in South Asia where the environmental issues are at peak. The purpose of this work is to introduce such environmentally friendly system of transportation in South Asia, especially in Pakistan and this stack model can be used as a prototype for developing FC based motorbike as currently no practical models have been tested in this region. Therefore, this model has unique advantages over the existing in the literature.
Modeling and simulation of planar SOFC to study the electrochemical properties
Jawad Hussain,Rashid Ali,Majid Niaz Akhtar,Mujtaba Hussain Jaffery,Imran Shakir,Rizwan Raza 한국물리학회 2020 Current Applied Physics Vol.20 No.5
In this paper, modeling and simulations are carried out using COMSOL Multiphysics. A three-dimensional model is developed for a planar intermediate temperature (IT) solid oxide fuel cell (SOFC). A parametric study has been carried out to analyze the performance of SOFC. Simulations reveal some promising features and enhanced performance of SOFC. It is shown that the maximum value of power (4–3.3) kW/m2 still remains higher with significant rise of temperature (600 °C–1000 °C), nearly 0.15 kW/m2 is the very small loss of power per 100 °C rise of temperature. Results have shown that the electrolytic current density is (6700–5500) A/m2 for peak value of power (4–3.3) kW/m2 with increase of temperature (600 °C–1000 °C). For model validation we have plotted a comparison of average current density.