Browsing Química by Title
Now showing items 278-297 of 313
-
Targeted transcriptomic and metabolic profiling reveals temporal bottlenecks in the maize carotenoid pathway that may be addressed by multigene engineering
(Wiley, 2013)Carotenoids are a diverse group of tetraterpenoid pigments found in plants, fungi, bacteria and some animals. They play vital roles in plants and provide important health benefits to mammals, including humans. We ... -
The 79°N Glacier cavity modulates subglacial iron export to the NE Greenland Shelf
(Nature Research, 2021)Approximately half of the freshwater discharged from the Greenland and Antarctic Ice Sheets enters the ocean subsurface as a result of basal ice melt, or runoff draining via the grounding line of a deep ice shelf or ... -
The chronic toxicity of ZnO nanoparticles and ZnCl2 to Daphnia magna and the use of different methods to assess nanoparticle aggregation and dissolution.
(Taylor & Francis, 2014-11)In this study, the effect of ZnO nanoparticles and ZnCl2 on growth, reproduction and accumulation of Daphnia magna was determined in a 21 day chronic toxicity test. Different techniques were used to distinguish between the ... -
The effect of frozen storage on the phenolic compounds of Morus nigra L. (black mulberry) and Morus alba L. (white mulberry) fruit
(Cirad / EDP Sciences, 2015-03-01)Morus nigra L. (black mulberry) and Morus alba L. (white mulberry) display high concentrations of health-promoting compounds, particularly phenolics. However, no published studies have addressed the changes in the content ... -
The effects of sous-vide cooking parameters on texture and cell wall modifications in two apple cultivars: A response surface methodology approach
(SAGE Publications, 2017)This work aimed at evaluating the effects of sous-vide cooking parameters, such as time and temperature and their interactions, on textural attributes of 'Mondial Gala' and 'Granny Smith' apple cultivars. For this, different ... -
The fruit cuticle as a modulator of postharvest quality
(Elsevier, 2014-06)The composition and structure of the surface tissues have a noticeable influence on the postharvest storage potential of fruits, inasmuch as they behave as a barrier against drying, chemical attacks, mechanical injuries ... -
The impact of electrodic adsorption on Zn, Cd and Pb speciation measurements with AGNES
(Elsevier, 2014-05-27)The systems assayed in this work (Cd with iodide, Cd with polyacrylic acid, Pb or Zn with xylenol orange, etc.) as well as others previously studied in our lab (Pb/Cd/Zn with humic acids, Pb with pyridinedicarboxylic acid, ... -
The impact of high Zn degrees concentrations on the application of AGNES to determine free Zn(II) concentration
(Elsevier, 2010-01-01)AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) determination of free Zn(II) in a solution can be affected by the reaching of high Zn° concentrations inside the amalgam. At concentrations about the solubility ... -
The impact of the transient uptake flux on bioaccumulation: linear adsorption and first-order internalisation coupled with spherical semi-infinite mass transport
(Elsevier, 2004)The uptake of a chemical species (such as an organic molecule or a toxic metal ion) by an organism is modelled considering linear pre-adsorption followed by a first-order internalisation. The active biosurface is supposed ... -
The influence of Arctic Fe and Atlantic fixed N on summertime primary production in Fram Strait, North Greenland Sea
(Springer Nature, 2020-09-17)Climate change has led to a ~ 40% reduction in summer Arctic sea-ice cover extent since the 1970s. Resultant increases in light availability may enhance phytoplankton production. Direct evidence for factors currently ... -
The proton binding properties of biosorbents
(Springer Nature, 2019-04-15)A broad variety of materials of biological origin have been successfully used in recent decades for the removal of pollutants from waters. These biosorbents include natural polymers that play a key role for adsorption. It ... -
The use of microelectrodes with AGNES
(Elsevier, 2007)Absence of gradients and nernstian equilibrium stripping (AGNES) is a new electroanalytical technique designed to determine free heavy metal ion concentrations in solutions. AGNES had been applied, up to date, with ... -
Theoretical aspects of dynamic metal speciation with electrochemical techniques
(Elsevier, 2017)Understanding the reaction-diffusion processes of metal species is essential for an adequate description and control of metal availability. Electroanalytical techniques are well suited to probe dynamic speciation in aqueous ... -
Time weighted average concentrations measured with Diffusive Gradients in Thin films (DGT)
(Elsevier, 2019-07-04)Time weighted average (TWA) concentrations can improve the assessment of water quality. DGT (Diffusive Gradients in Thin films) devices have been suggested as simple tools to measure TWA metal concentrations, but the ... -
Towards improving the electroanalytical speciation analysis of indium
(Elsevier, 2019)The geochemical fate of indium in natural waters is still poorly understood, while recent studies have pointed out a growing input of this trivalent element in the environment as a result of its utilisation in the manufacturing ... -
Trace Element (Fe, Co, Ni and Cu) Dynamics Across the Salinity Gradient in Arctic and Antarctic Glacier Fjords
(Frontiers Media, 2021-09-27)Around the Greenlandic and Antarctic coastlines, sediment plumes associated with glaciers are significant sources of lithogenic material to the ocean. These plumes contain elevated concentrations of a range of trace metals, ... -
Transient biouptake flux and accumulation by microorganisms: the case of two types of sites with Langmuir adsorption
(Elsevier, 2006)The uptake of a chemical species by an aquatic microorganism is modelled considering two kinds of sites where Langmuirian adsorption is followed by first order internalisation kinetics. Simpler models, such as only one ... -
Transport Properties of the Ionic Liquid 1-Ethyl-3-Methylimidazolium Chloride from Equilibrium Molecular Dynamics Simulation. The Effect of Temperature
(American Chemical Society, 2006)We present here equilibrium molecular dynamics simulation results for self-diffusion coefficients, shear viscosity, and electrical conductivity in a model ionic liquid (1-ethyl-3-methylimidazolium chloride) at ... -
UHPLC–MS Analysis of Juvenile Hormone II in Mediterranean Corn Borer (Sesamia nonagrioides) Hemolymph Using Various Ionization Techniques
(American Chemical Society, 2012)The juvenile hormones (JHs) have been considered the most versatile hormones in the animal kingdom. JH-II is the most abundant JH in Sesamia nonagrioides, important maize pests in the Mediterranean basin. This study compared ... -
Use of biobased crude glycerol, obtained biocatalytically, to obtain biofuel additives by catalytic acetalization of furfural using SAPO catalysts
(Elsevier, 2022)High-pure crude glycerol, obtained from the transesterification of coconut oil with ethanol using lipase enzyme- type as biocatalyst, has been used for the acetalization of furfural with several SAPO 5 and SAPO 34 catalysts. ...