Browsing Chemistry & Earth Sciences by Title
Now showing items 357-376 of 551
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Performance of Pristine versus Magnetized Orange Peels Biochar Adapted to Adsorptive Removal of Daunorubicin: Eco-Structuring, Kinetics and Equilibrium Studies
( Multidisciplinary Digital Publishing Institute (MDPI) , 2023 , Article)Drugs and pharmaceuticals are an emergent class of aquatic contaminants. The existence of these pollutants in aquatic bodies is currently raising escalating concerns because of their negative impact on the ecosystem. This ... -
Phospholipid fatty acid composition of nine marine sponges from Qatar
( IFREMER , 1998 , Conference Paper)Phospholipid fatty acid composition was studied in sponge from Qatar including eight Demospongia and one Calcarea. More than 60 fatty acids were identified in each species as methyl esters and N-acyl pyrrolidides by gas ... -
Phospholipid Fatty Acids Compositions of Sponges from Qatar I- Haplosclerida
( Qatar University , 2006 , Article)The phospholipid fatty acid contents of six Haplosclerida sponges collected along Qatari ;ts, Arabian Gulf, were identified by coupling GC-MS experiments. More than hundred of rated and unsaturated fatty acids have been ... -
Phosphonated Polyetheramine-Coated Superparamagnetic Iron Oxide Nanoparticles for Inhibition of Oilfield Scale
( American Chemical Society , 2023 , Article)Oilfield scale is one of the significant problems in hydrocarbon production in the oil and gas industry. Many research groups have attempted to develop greener chemicals to meet environmental regulations. Magnetic nanoparticles ... -
Photocatalytic degradation of methyl orange as a model compound
( Elsevier , 2002 , Article)Titanium dioxide (TiO2) was used as a photocatalyst for the detoxification of water containing methyl orange (MO), which was used as a model compound. Solar radiation was used as an irradiation source. It was found that ... -
Photodynamic therapy for hair removal
( Hamad bin Khalifa University Press (HBKU Press) , 2013 , Article)Background: Unwanted hair is one of the most common medical problems affecting women of reproductive age inducing a lot of psychological stress and threatening their femininity and self-esteem. Old methods of removing ... -
Photoelectrocatalytic hydrogen production on ternary Co-Pi/Ag/TiON nanotube array photocatalysts
( John Wiley and Sons Ltd , 2021 , Article)Ternary Co-Pi-Ag/TiON photocatalysts were designed and fabricated by a facile precipitation and electrochemical strategy. The results showed the superiority of the Co-Pi-Ag/TiON as a promising photoanode for photoelectrochemical ... -
Photoinduced electron transfer interaction of anthraquinones with aniline quenchers: Influence of methyl substitution in aniline donors
( Elsevier , 2017 , Article)© 2016 Elsevier B.V. Photoinduced electron transfer between triplet state of 9,10-anthraquinone (AQ) and its two derivatives: 2-chloro-9,10-anthraquinone (CAQ) and sodium anthraquinone-2-sulfonate (AQS) and ground state ... -
Physical functionalization of multi-walled carbon nanotubes for enhanced dispersibility in aqueous medium
( Springer Nature , 2020 , Article)Noncovalent functionalization of multi-walled carbon nanotubes (MWCNTs) by anionic surfactants (sodium dodecylbenzene sulfonate; SDBS and sodium cholate; SC) results in stable aqueous dispersions. SDBS showed better ... -
Physicochemical Properties of Derivatives of N,N-Dimethylamino–cyclic–chalcones: Experimental and Theoretical Study
( Wiley-Blackwell , 2016 , Article)A series of three N,N-dimethyl-amino-cyclic-chalcones chromophores of the D-π-A type (1-3) where, (Donor= N,N-dimethyl-aniline) and Acceptor= indan-1-one (1), 3,4-dihydro-2H-naphthalen-1-one (2) and 3,4,5-tetrahydro-benz ... -
Phytochemical Analysis of Acacia ehrenbergiana (Hayne) Grown in Qatar: Identification of Active Ingredients and Their Biological Activities
( MDPI , 2022 , Article)Acacia ehrenbergiana (Hayne), also known as Salam, is a highly drought resistant shrub distributed in North and East Africa, and the Arabian Peninsula. The plant is gathered for its gum and fiber, and is an important legume ... -
Phytochemical Analysis of Anastatica hierochuntica and Aerva javanica Grown in Qatar: Their Biological Activities and Identification of Some Active Ingredients
( MDPI , 2023 , Article)Plant-derived compounds and their extracts are known to exhibit chemo preventive (antimicrobial, antioxidant and other) activities. The levels of such chemo preventive compounds vary depending on environmental factors, ... -
Piezoelectric properties of zinc oxide/iron oxide filled polyvinylidene fluoride nanocomposite fibers
( Springer , 2021 , Article)Piezoelectric nanogenerators (PENG) with flexible and simple design have pronounced significance in fabricating sustainable devices for self-powering electronics. This study demonstrates the fabrication of electrospun ... -
Pinctada radiata (pearl oyster): A bioindicator for metal pollution monitoring in the Qatari waters (Arabian Gulf)
( Springer Nature , 1998 , Article)Bivalves are extensively used in monitoring programmes in the marine environment due to their ability to concentrate pollutants to several orders of magnitude above ambient levels in sea water. Commonly, the levels of ... -
Plackett-Burman and Box-Behnken designs as chemometric tools for micro-determination of L-Ornithine
( Elsevier B.V. , 2018 , Article)Plackett-Burman (PB) and Box-Behnken (BB) screening and response surface factorial designs were used to evaluate spectrophotometric and spectrofluorimetric approaches for the determination of l-Ornithine (ORN) as per se ... -
Plasmonic Modulator Based on Fano Resonance
( Hamad bin Khalifa University Press (HBKU Press) , 2016 , Conference Paper)The field of plasmonics is continuously attracting research in the area of integrated photonics development, to highly integrate photonic components, devices and detectors in a single photonic chip, just as electronic chips ... -
Plastic Membrane Electrodes for the Potentiometric Determination of Codeine in Pharmaceutical Preparations
( Springer New York , 1997 , Article)Four PVC membrane electrode systems responsive to codeinium cation are described. These electrodes are based on the use of the ion-association complexes of the codeinium cation with tetraphenylborate and reineckate ... -
Poisonous plants contaminating edible ones and toxic substances in plant foods IV. Phytochemistry and toxicity of lolium temulentum
( Taylor & Francis , 2008 , Article)Different procedures were carried out for the preparation and separation of the total alkaloids of Lolium temulentum. Loline has been identified as the major pyrrolizidine alkaloid of the seeds. The toxicity of the alcoholic ... -
Polarization resistance study of inhibition of corrosion of lead by sodium benzoate in 0.1 M sodium hydroxide solution
( Council of Scientific and Industrial Research , 1989 , Article)The effect of sodium benzoate (SB) as an inhibitor of corrosion of lead in 0.1 M NaOH solution has been investigated by using the polarization resistance technique. The concentrations of SB employed are in the range 1-5 × ... -
Polarization Resistance Study on Copper Corrosion in Aqueous Potassium Hydrogen Phthalate Solution
( WILEY-VCH Verlag , 1987 , Article)The effect of temperature on corrosion of copper in 0.1 M aqueous solution of potassium hydrogen phthalate (KHPh) has been investigated using polarization resistance technique. it was found that that the corrosion rate in ...
