Browsing Articles publicats (Química) by Title
Now showing items 131-150 of 212
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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, ... -
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 ... -
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 ... -
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 ... -
Model-independent link between the macroscopic and microscopic descriptions of multidentate macromolecular binding: Relationship between stepwise, intrinsic, and microscopic equilibrium constants
(American Chemical Society, 2009)The binding of ions or other small molecules to macromolecules and surfaces can be macroscopically characterized by means of the stepwise (or stoichiometric) equilibrium constants, which can be obtained experimentally ... -
Modeling biominerals formed by apatites and DNA
(Springer, 2013)Different aspects of biominerals formed by apatite and DNA have been investigated using computer modeling tools. Firstly, the structure and stability of biominerals in which DNA molecules are embedded into hydroxyapatite and ... -
Modelling the steady-state current at the inlaid disc microelectrode for homogeneous mediated enzyme catalysed reactions
(Elsevier, 2001)The steady-state currents at an inlaid microdisc electrode have been modelled for a redox mediated enzyme catalysed reaction (such as the glucose/glucose oxidase/ferrocene system) in which all the components are present ... -
La naturalesa de l'enllaç químic. Contribucions de Linus Pauling
(Societat Catalana de Ciències Físiques, Químiques i Matemàtiques (Barcelona, Catalunya), 1996)Aquest treball comença amb un breu repàs de l'evolució històrica del concepte d'enllaç químic, seguit d'una introducció als dos models que, en el marc de la mecànica quàntica, es fan servir actualment per explicar aquell ... -
New methodology to measure low free indium (III) concentrations based on the determination of the lability degree of indium complexes. Assessment of In(OH)3 solubility product
(Elsevier B.V., 2019)The vast industrial and consumer application of indium (solar cells, displays, etc.) risks its eventual leakage to the environment. Given the relevant role of speciation on the ecotoxicological effects of a certain total ... -
Non-purged voltammetry explored with AGNES
(Royal Society of Chemistry, 2013)The reduction of oxygen increases pH in the surroundings of an electrode. A theoretical model estimates the steady-state pH profile from the surface of the electrode up to the bulk solution. A very simple formula predicts ... -
Número de ciclos cortos necesarios para inducir la diapausa en huevos y larvas de Sesamia nonagrioides (Lefebvre)
(Espanya. Ministerio de Medio Ambiente y Medio Rural y Marino, 2000)Se sometieron huevos de Sesamia nonagrioides (LEFEBVRE) durante su desarrollo embrionario a fotoperiodo corto 12:12 (L:O) y posteriormente a fotoperiodos 16:8 y 0:24, sin observar que se hubiera inducido diapausa en ... -
Optimización de la composición del atrayente sexual de Sesamia nonagrioides Lef.
(Espanya. Ministerio de Medio Ambiente y Medio Rural y Marino, 1992)Se describen una serie de ensayos de campo y laboratorio (pruebas de EAG, Electro-Anteno-Grama), para optimizar el tipo de trampa, la composición y la dosis de la mezcla atrayente, con miras a obtener un nivel máximo de ...