Browsing Articles publicats (Química) by Title
Now showing items 158-177 of 275
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Ion binding to polyelectrolytes: Monte Carlo simulations versus classical mean field theories
(Springer Verlag, 2009)The influence of ion size and surface charge model in titrations of ionizable polyelectrolytes is studied by means of the Semi Grand Canonical Monte Carlo simulation method in the context of the primitive model. Three ... -
Ionization and Conformational Equilibria of Citric Acid: Delocalized Proton Binding in Solution
(American Chemical Society, 2017-07-13)The microspeciation of citric acid is studied by analyzing NMR titration data. When the site binding (SB) model, which assumes fully localized proton binding to the carboxylic groups, is used to obtain microscopic energy ... -
Iron Speciation in Fram Strait and Over the Northeast Greenland Shelf: An Inter-Comparison Study of Voltammetric Methods
(Frontiers Media, 2021-01-21)Competitive ligand exchange - adsorptive cathodic stripping voltammetry (CLE-AdCSV) is a widely used technique to determine dissolved iron (Fe) speciation in seawater, and involves competition for Fe of a known added ligand ... -
Is it possible to substitute hexane with green solvents for extraction of carotenoids? A theoretical versus experimental solubility study
(Royal Society of Chemistry, 2016)The present study was designed to evaluate five green solvents, i.e. 2-methyltetrahydrofuran (2-MeTHF), dimethyl carbonate (DMC), cyclopentyl methyl ether (CPME), isopropyl alcohol (IPA) and ethyl acetate, for the substitution ... -
Labile trace metal concentration measurements in marine environments: From coastal to open ocean areas
(Elsevier, 2019-05-06)In seawater, trace metals occur in many forms: free ion, labile and non-labile complex, colloid, associated with particles, but only free ions and very labile metal complexes can cross the phytoplankton membrane and be ... -
Lability and mobility effects on mixtures of ligands under steady-state conditions
(Royal Society of Chemistry, 2003)Analytical solutions for the steady-state flux arriving at an active surface from a mixture (in which one active species reacts with non-active ligands in the medium) can be helpful in a variety of problems: voltammetric ... -
Lability of complexes in steady-state finite planar diffusion
(Elsevier, 2006)The analytical solution of the reaction-diffusion problem of a species forming a complex (with any association and dissociation rate constants) in solution and disappearing at an active planar surface is presented for a ... -
Las propiedades antioxidantes de la cereza 'Sweetheart' protegen al fruto del deterioro post-cosecha
(Interempresas Media, 2013)Los mecanismos enzimáticos de modificación de las paredes celulares, que resultan en cambios en la firmeza, la textura y la calidad general del fruto durante su vida postcosecha, han sido históricamente el objetivo preferente ... -
LBGK method coupled to time splitting technique for solving reaction-diffusion processes in complex systems
(The Royal society of Chemistry, 2005)A new approach to numerically solve a reaction-diffusion system is given, specifically developed for complex systems including many reacting/diffusing species with broad ranges of rate constants and diffusion coefficients, ... -
Life cycle assessment of Italian and Spanish bovine leather production systems
(Asociación de Químicos e Ingenieros del Instituto Químico de Sarriá, 2011)El objetivo de la investigación aquí descrita fue era estudiar el perfil ambiental de dos sistemas de fabricación de cuero vacuno (el italiano y el español), para identificar sus puntos débiles y para averiguar si las ... -
Limits of the Linear Accumulation Regime of DGT Sensors
(American Chemical Society, 2013)A key question for the practical application of DGT (Diffusive Gradients in Thin films) as dynamic sensors in the environmental monitoring of trace metals is the influence of pH and dissolved ligands over the linear ... -
Limonene as an agro-chemical building block for the synthesis and extraction of bioactive compounds
(Académie des sciencesElsevier, 2016-06-28)The objective of this study was to transform limonene as an agro-chemical platform for the production of a wide range of added-value compounds for pharmaceutical, cosmetic and food ingredients. This molecule was also ... -
Lipase activity and enantioselectivity of whole cells from a wild-type Aspergillius flavus strain
(Elsevier, 2014)This study reports the high enantiomeric preference of whole cell lipase from Aspergillus flavus wild-type that allows the preparation of a chiral secondary alcohol. Whole cells prepared from a wild-type Aspergillus flavus ... -
Lipoxygenase activity is involved in the regeneration of volatile ester-synthesizing capacity after ultra-low oxygen storage of 'Fuji' apple.
(American Chemical Society, 2009)An extra period under cold air after ultra-low oxygen storage has been shown to increase the concentration of some volatile compounds emitted by stored 'Fuji' apples. The purpose of this work was to assess the role, if ... -
Long-term storage of Pink Lady apples modifies volatile-involved enzyme activities: consequences on production of volatile esters
(American Chemical Society, 2008)Pink Lady apples were harvested at commercial maturity and stored at 1 °C and 92% relative humidity under either air or controlled atmosphere conditions (2 kPa O2:2 kPa CO2 and 1 kPa O2:1 kPa CO2) for 27 weeks. Data on ... -
Macromolecular diffusion in crowded media beyond the hard-sphere model
(Royal Society of Chemistry, 2018-03-20)The effect of macromolecular crowding on diffusion beyond the hard-core sphere model is studied. A new coarse-grained model is presented, the Chain Entanglement Softened Potential (CESP) model, which takes into account the ... -
Measurement of vibrations in two tower-typed assistant personal robot implementations with and without a passive suspension system
(MDPI, 2017)This paper presents the vibration pattern measurement of two tower-typed holonomic mobile robot prototypes: one based on a rigid mechanical structure, and the other including a passive suspension system. Specific to the ... -
Mechanisms of silver nanoparticle toxicity to the coastal marine diatom Chaetoceros curvisetus
(Springer Nature, 2017-09-07)Inputs of silver nanoparticles (AgNPs) to marine waters continue to increase yet mechanisms of AgNPs toxicity to marine phytoplankton are still not well resolved. This study reports a series of toxicity experiments on a ... -
Mercury species export from the Arctic to the Atlantic Ocean
(Elsevier, 2020-09-10)The Fram Strait is the only deep connection between the Arctic and Atlantic Oceans. The main water and mercury (Hg) fluxes between these oceans occur via the Fram Strait and Barents Sea Opening. Several Hg mass balance ... -
Metal (Pb, Cd, and Zn) Binding to Diverse Organic Matter Samples and Implications for Speciation Modeling
(American Chemical Society, 2018)This study evaluated the influence of dissolved organic matter (DOM) properties on the speciation of Pb, Zn and Cd. Six DOM samples were categorized into autochthonous and allochthonous source based on their absorbance and ...