Browsing Chemistry & Earth Sciences by Title
Now showing items 426-445 of 557
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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. ... -
Secretory laccase from pestalotiopsis species CDBT-F-G1 fungal strain isolated from high altitude: Optimization of its production and characterization
( MDPI AG , 2019 , Article)Microorganisms producing laccases may be used for the pretreatment of lignocellulosic biomass to recover fermentable sugar. Very few fungi and other microbes growing in high altitudes have been tested for this purpose. As ... -
Selective determination of thiamine (vitamin B1) in pharmaceutical preparations by direct potentiometric argentometric titration with use of the silver-silver sulphide ion-selective electrode
( Elsevier , 1989 , Article)A simple and selective argentometric titration method is described for determination of thiamine (vitamin B1), based on direct potentiometric titration in alkaline media (⩾0.5M) in which a chemical transformation takes ... -
Self-assembled zirconia nanotube arrays: Fabrication mechanism, energy consideration and optical activity
( Royal Society of Chemistry , 2014 , Article)We present a comprehensive roadmap for the precise control of the dimensions and optical properties of anodically fabricated zirconia nanotubes. The effects of anodization time, applied voltage, solvent composition, as ... -
Sesquiterpene lactones from Pulicaria sicula
( Elsevier , 1988 , Article)The aerial parts of Pulicaria sicula afforded the known xanthanolides 1-6, the guaianolides 7 and 8 as well as two new ones, the lactone 9 and the corresponding epoxide 10. Furthermore nerylisobutyrate and the thymol ... -
SiGe@Cu films as stable and high energy density anodes for lithium-ion microbatteries
( Springer , 2020 , Article)In this work, the deposition of stoichiometric SiGe alloy on Cu substrate by radio frequency (RF) magnetron sputtering was examined. The structure, morphology, and composition of the SiGe@Cu were identified by X-ray ... -
Silica-based chelating resin bearing dual 8-Hydroxyquinoline moieties and its applications for solid phase extraction of trace metals from seawater prior to their analysis by ICP-MS
( Elsevier B.V. , 2019 , Article)Solid phase extraction (SPE) using chelating resins has been established as a convenient technique for samples pretreatment prior to trace metal analysis from complex matrices. Oxine chelating agents (e.g., 8-Hydroxyquinoline ... -
Silicon nanofilms as anode materials for flexible lithium ion batteries
( Elsevier B.V. , 2019 , Article)Silicon (Si)-based anodes demonstrate great potential for the revolutionary enhancement in the energy storage of Li-ion cells. Unfortunately, these materials suffer from several shortcomings, such as high electrical ... -
Silicon–Germanium bilayer sputtered onto a carbon nanotube sheet as anode material for lithium–ion batteries
( Elsevier Ltd , 2019 , Article)In this work, multiwalled carbon nanotube-silicon/germanium (MWCNT-Si/Ge) electrodes were prepared by layer-by-layer deposition of Si and Ge films onto an MWCNT sheet using RF magnetron sputtering. The MWCNT-Si/Ge composites ... -
Silver Nanoparticles-Decorated Titanium Oxynitride Nanotube Arrays for Enhanced Solar Fuel Generation
( Nature Publishing Group , 2017 , Article)We demonstrate, for the first time, the synthesis of highly ordered titanium oxynitride nanotube arrays sensitized with Ag nanoparticles (Ag/TiON) as an attractive class of materials for visible-light-driven water splitting. ... -
A simple method for developing efficient room temperature reduced graphene oxide-coated polyurethane sponge and cotton for oil-water separation
( Taylor & Francis , 2022 , Article)Oil spilled during transportation, domestic, and industrial usage causes grave water and soil pollution. Therefore, oil recovery through absorption or separation from water has been a challenge to the scientific community. ... -
Sodium and lithium incorporated cathode materials for energy storage applications - A focused review
( Elsevier B.V. , 2021 , Article Review)The idea of lithium (Li)/sodium (Na) incorporated cathodes for both Li/Na-ion batteries has gained significant consideration throughout the past decade. The encouraging performance of various reported Li/Na incorporated ... -
Solid-State Ac-Conductivity Analysis For The Long Debated Catalytic Activity Of The Boralite Sieve
( Qatar University , 1996 , Article)The ac-phase dependent impedance, capacitance and dielectric loss of boralite are measured and correlated with those of a similar history HZSM-5 as a function of frequency (0.1-100 kHz) and temperature (373-638 K) at 0.8 ... -
Solid-state planar microsensors for selective potentiometric determination of ethylmorphine
( Marcel Dekker Inc. , 1999 , Article)The potentiometric performance characteristics of microelectronically fabricated solid-state planar ethylmorphine sensors based on silicon/silicon nitride substrate and a mixture of ethylmorphine-tetraphenylborate and ... -
Solution combustion synthesis of Ni-based hybrid metal oxides for oxygen evolution reaction in alkaline medium
( The Royal Society of Chemistry , 2022 , Article)Oxygen evolution reaction (OER) has arisen as an outstanding technology for energy generation, conversion, and storage. Herein, we investigated the synthesis of nickel-based hybrid metal oxides (NixM1−xOy) and their catalytic ... -
Solution combustion synthesis of Ni/La2O3for dry reforming of methane: Tuning the basicity via alkali and alkaline earth metal oxide promoters
( Royal Society of Chemistry , 2021 , Article)The production of syngas via dry reforming of methane (DRM) has drawn tremendous research interest, ascribed to its remarkable economic and environmental impacts. Herein, we report the synthesis of K, Na, Cs, Li, and ... -
Solvent Influence on Absorption Spectra and Tautomeric Equilibria of Symmetric Azomethine-Functionalized Derivatives: Structural Elucidation and Computational Studies.
( Wiley Open Access , 2022 , Article)A new series of azomethine-functionalized compounds was synthesized from the condensation of 2-hydroxy-1,3-propanediamine and 2-thienylcarboxaldehydes in the presence of a drying agent. The derivatives were spectroscopically ... -
Spectral, thermal, and molecular modeling studies on the encapsulation of selected sulfonamide drugs in ?-cyclodextrin nano-cavity
( Elsevier , 2014 , Article)In the present work the inclusion complexation of three sulfonamide (SA) drugs, namely sulfisoxazole (SSX), sulfamethizole (SMZ), and Sulfamethazine (STM) with β-cyclodextrin (β-CD) has been investigated using UV–Vis ... -
Spectrofluorometric investigations on the solvent effects on the photocyclization reaction of diclofenac
( Elsevier , 2023 , Article)The solvent effects on the photochemical conversion rate of the photosensitizing drug diclofenac (DCF) were investigated using steady-state fluorescence spectroscopy. The spectral information obtained for the photochemical ...