Browsing Chemistry & Earth Sciences by Title
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Reduction kinetics of ceria surface by hydrogen
( Elsevier , 2004 , Article)Sintered ceria pellets of porosity 16.4% and density 5.99gcm−3 were treated in a hydrogen flow at 1atm and various temperatures. The electrical conductivity was measured in situ while hydrogen gas was flowing over the CeO2. ... -
Reduction kinetics of ceria surface by hydrogen
( Wiley Periodicals, Inc. , 2004 , Article)Powdered cerium dioxide (ceria, CeO2) as compressed, sintered pellets, of porosity 16.4% and density 5.99 g cm−3, were treated in hydrogen flow at 1 atm and various temperatures to effect reduction. The electrical conductivity ... -
Regiospecific Photochemical Synthesis of Methylchrysenes
( MDPI , 2023 , Article)Methylated polycyclic aromatic hydrocarbons (PAHs) are suspected to be some of the toxic compounds in crude oil towards marine life and are needed as single compounds for environmental studies. 1-, 3- and 6-methylchrysene ... -
Regulatory Mechanisms That Guide the Fetal to Postnatal Transition of Cardiomyocytes
( Multidisciplinary Digital Publishing Institute (MDPI) , 2023 , Article)Heart disease remains a global leading cause of death and disability, necessitating a comprehensive understanding of the heart’s development, repair, and dysfunction. This review surveys recent discoveries that explore the ... -
Relationship of plant proteins and amino acids within taxonomic categories in Qatari range plants
( Asian Publication Corporation , 2005 , Article)Protein and amino acids of sixty-eight range plants growing wild in Qatar belonging to fifty-six genera and twenty-three families are studied to evaluate their nutritive values -
Remote Corticospinal Tract Degeneration After Cortical Stroke in Rats May Not Preclude Spontaneous Sensorimotor Recovery
( SAGE Publications Inc. , 2021 , Article)Background. Recovery of motor function after stroke appears to be related to the integrity of axonal connections in the corticospinal tract (CST) and corpus callosum, which may both be affected after cortical stroke. ... -
REMOTE MONITORING AND CONTROL OF MICROCOMPUTER RAISED DATA ACQUISITION SYSTEMS
( Blackwell Publishing Ltd , 1994 , Article) -
Removal of Toxic Elements and Microbial Contaminants from Groundwater Using Low-Cost Treatment Options
( Springer Science and Business Media Deutschland GmbH , 2021 , Article)Purpose of Review: This paper reviews various low-cost treatment techniques such as adsorption, permeable reactive barrier, and biological techniques for the simultaneous removal of chemical and microbial contaminants from ... -
Response to: "Cancer risk due to contamination: Consideration from market basket survey in Qatar"
( Elsevier , 2014 , Other)We welcome the comments on our article entitled “A market basket survey of As, Zn and Se in rice imports in Qatar: Health implications” (Rowell et al., 2014). The commenter opens up the debate on what constitutes a safe ... -
A review for Metal-Organic Frameworks (MOFs) utilization in capture and conversion of carbon dioxide into valuable products
( Elsevier Ltd , 2021 , Article Review)Carbon dioxide (CO2) has become a primary atmospheric greenhouse gas that has stirred up numerous energies and environmental-related mishaps around the world. Its unwelcome contribution to the decay of the global ecosystem ... -
Review on Synthesis, Characterizations, and Electrochemical Properties of Cathode Materials for Lithium Ion Batteries
( OMICS International , 2016 , Article)The development of cutting-edge cathode materials is a challenging research topic aiming to improve the energy and power densities of lithium ion batteries (LIB) to cover the increasing demands for energy storage devices. ... -
RGO/Stibnite Nanocomposite as a Dual Anode for Lithium and Sodium Ion Batteries
( American Chemical Society , 2016 , Article)RGO/Sb2S3 nanocomposite has been investigated in this study as a dual anode material for Li- and Na-ion battery applications. The stibnite phase of Sb2S3, and its rGO composite have been obtained from a molecular complex, ... -
Rice is a potential dietary source of not only arsenic but also other toxic elements like lead and chromium
( Elsevier B.V. , 2017 , Article)Rice is a staple food and a good source of nutrition for half of the earth’s population including Middle Eastern countries. However, rice may accumulate hazardous levels of toxic elements. In KSA, rice is imported from ... -
Role of doping and sheet size in tailoring optoelectronic properties of germanene: A TDDFT study
( John Wiley and Sons Inc. , 2018 , Article)Germanene is a novel 2D material with promising optoelectronic properties, tuning of which is to be explored. This work demonstrates that doping and increasing the sheet size can alter optical and electronic properties of ... -
Role of organic cation in modern lead-based perovskites
( Elsevier Ltd , 2019 , Article)Hybrid organic-inorganic metal perovskites (ABX3, A- organic cation, B-metal ion, X-halide ion) have shown significant potential as thin-film solar cells or Dye solar cells (DSC) materials. Using a time-dependent density ... -
Role of Post-Hydrothermal Treatment on the Microstructures and Photocatalytic Activity of TiO2-Based Nanotubes
( MDPI , 2022 , Article)The present study demonstrates the thermal stability and photocatalytic activity of TiO2-based nanotubes with respect to post-hydrothermal treatment. Titanate nanotubes were synthesized by adapting an alkali hydrothermal ... -
Role of Solvent Polarity and Hydrogen-Bonding on Excited-State Fluorescence of 3-[(E)-{4-[Dimethylamino]benzylidene}amino]-2-naphthoic Acid (DMAMN): Isomerization vs Rotomerization
( American Chemical Society , 2018 , Article)The present experimental and theoretical study on a new chromophore DMAMN of the type push-?-pull (push = dimethylaniline, ? = imine, pull = 2-naphthoic acid), allows understanding of the mechanism by which the molecular ... -
Roll-over cyclometalation: A versatile tool to enhance the catalytic activity of transition metal complexes
( Elsevier B.V. , 2018 , Article)Roll-over cyclometalation is a special case of cyclometalation. While in classical cyclometalation, C,H-activation (deprotonation or oxidative addition) has to occur at the ligand to result in a metallacycle, in roll-over ... -
Salicylic acid restricts mercury translocation by activating strong antioxidant defense mechanisms in sweet pepper (Capsicum annum L.)
( Elsevier B.V. , 2023 , Article)Mercury (Hg) availability in soil and its absorption in plants is seriously concerned for plant production and human health. Salicylic acid (SA) is one of the major plant hormones involved in plant growth and development ... -
Screening and optimization of samarium-assisted complexation for the determination of norfloxacin, levofloxacin and lomefloxacin in their corresponding dosage forms employing spectrofluorimetry
( Elsevier B.V. , 2019 , Article)Multivariate strategy was applied for setting a fluorescent technique for the determination of three fluoroquinolones: norfloxacin (NOR), levofloxacin (LEV) and lomefloxacin (LOM) in their pure powder and dosage forms. ...