Browsing Química by Title
Now showing items 199-218 of 313
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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 ... -
Microfluidic encapsulation for controlled release and its potential for nanofertilisers
(Royal Society of Chemistry, 2021)Nanotechnology is increasingly being utilized to create advanced materials with improved or new functional attributes. Converting fertilizers into a nanoparticle-form has been shown to improve their efficacy but the current ... -
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 ... -
Near-infrared hyperspectral imaging for deoxynivalenol and ergosterol estimation in wheat samples
(Elsevier, 2020-09-30)The present study aimed to evaluate the use of hyperspectral imaging (HSI)-NIR spectroscopy to assess the presence of DON and ergosterol presence in wheat samples through prediction and classification models. To achieve ... -
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 ... -
New polymeric/inorganic hybrid sorbents based on red mud and nanosized magnetite for large scale applications in As(V) removal
(Elsevier, 2017-03-01)Red mud (RM), a waste product generated in the industrial production of aluminium, was recovered for a second use as As(V) adsorbent. RM adsorption properties were compared to those obtained with a nanostructured in-lab ... -
Non-monotonic behavior of weak-polyelectrolytes adsorption on a cationic surface: a Monte Carlo simulation study
(Elsevier, 2021)In this work, the weak polyelectrolyte (PE) adsorption on a strong cationic surface is studied with constant pH Monte Carlo simulations using a coarse-grained model. When a large number of PE chains is added to the system, ... -
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 ... -
Novel and efficient biotechnological approach to produce 2,5-diformylfuran from biomass-derived 5-hydroxymethylfurfural
(American Chemical Society, 2021)The preparation of compounds of interest from biomass-derived 5-hydroxymethylfurfural (HMF) has attracted considerable attention. One such compound is 2,5-diformylfuran (DFF), obtained through oxidation of the hydroxyl ... -
Numerical Simulation of Non-Linear Models of Reaction—Diffusion for a DGT Sensor
(MDPI, 2020-04-20)In this work, we present a novel strategy for the numerical solution of a coupled system of partial differential equations that describe reaction–diffusion processes of a mixture of metals and ligands that can be absorbed ... -
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 ... -
Oligosaccharides: Defense Inducers, Their Recognition in Plants, Commercial Uses and Perspectives
(MDPI, 2020-12-16)Plants have innate immune systems or defense mechanisms that respond to the attack of pathogenic microorganisms. Unlike mammals, they lack mobile defense cells, so defense processes depend on autonomous cellular events ... -
Optimal sizing of a hybrid grid-connected photovoltaic and wind power system
(Elsevier, 2015-09)Hybrid renewable energy systems (HRES) have been widely identified as an efficient mechanism to generate electrical power based on renewable energy sources (RES). This kind of energy generation systems are based on the ...