Consulta: subjectFacets:"Colloids"
Registros recuperados: 7
Data/hora: 16/06/2024 04:58:41

Stability of a colloidal system based on avocado ( Persea americana Mill. cv. Hass) and others: Effect of process and composition
Provedor de dados: 109
Autores: Estrada Mesa,Eliana María; Cortés Rodríguez,Misael; Correa Londoño,Guillermo Antonio.
Abstract Avocado (Persea americana Mill. cv. Hass), is a perishable fruit, which compositionally presents nutritional benefits, which has led to its productive chain to look for new alternatives of agroindustrialization to improve its competitiveness in the market, being guacamole a potential option. The aim of this research was to evaluate the influence of composition and homogenization process on the colloidal system stability based on avocado and other ingredients for a potential use in the aspersion drying process. We used the surface response methodology and a central composite experimental design for experimental optimization of the process, considering three independent variables as follows: avocado dry solids (DSavocado), homogenization time and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colloids; Fruits; Functional foods; Guacamole.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000300338

Comparison of the effects of lactated Ringer solution with and without hydroxyethyl starch fluid resuscitation on gut edema during severe splanchnic ischemia
Provedor de dados: 56
Autores: Lobo,S.M.; Orrico,S.R.P.; Queiroz,M.M.; Contrim,L.M.; Cury,P.M.
The type of fluid used during resuscitation may have an important impact on tissue edema. We evaluated the impact of two different regimens of fluid resuscitation on hemodynamics and on lung and intestinal edema during splanchnic hypoperfusion in rabbits. The study included 16 female New Zealand rabbits (2.9 to 3.3 kg body weight, aged 8 to 12 months) with splanchnic ischemia induced by ligation of the superior mesenteric artery. The animals were randomized into two experimental groups: group I (N = 9) received 12 mL·kg-1·h-1 lactated Ringer solution and 20 mL/kg 6% hydroxyethyl starch solution; group II (N = 7) received 36 mL·kg-1·h-1 lactated Ringer solution and 20 mL/kg 0.9% saline. A segment from the ileum was isolated to be perfused. A tonometric...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fluid resuscitation; Colloids; Crystalloids; Splanchnic ischemia; Intestinal edema.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008000700014

Additive rheology of complex granular flows
Provedor de dados: 5
Autores: Trung Vo, Thanh; Nezamabadi, Saeid; Mutabaruka, Patrick; Delenne, Jean-yves; Radjai, Farhang.
Granular flows are omnipresent in nature and industrial processes, but their rheological properties such as apparent friction and packing fraction are still elusive when inertial, cohesive and viscous interactions occur between particles in addition to frictional and elastic forces. Here we report on extensive particle dynamics simulations of such complex flows for a model granular system composed of perfectly rigid particles. We show that, when the apparent friction and packing fraction are normalized by their cohesion-dependent quasistatic values, they are governed by a single dimensionless number that, by virtue of stress additivity, accounts for all interactions. We also find that this dimensionless parameter, as a generalized inertial number,...
Tipo: Text
Palavras-chave: Civil engineering; Colloids; Physics; Process chemistry; Rheology.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00685/79680/82460.pdf

Preferential Riverine Export of Fine Volcanogenic Particles to the Southeast Australian Margin
Provedor de dados: 5
Autores: Bayon, Germain; Douglas, Grant B.; Denton, Geoff J.; Monin, Laurence; De Deckker, Patrick.
We report on rare earth element and neodymium isotopic compositions in a series of grain-size fractions separated from river suspended matter in the Murray-Darling Basin (MDB) and a nearby marine sediment core (MD03-2607) offshore south-eastern Australia. This source-to-sink approach was used to further investigate the extent to which sediment sorting may control the geochemistry of suspended loads in rivers, and to provide constraints on the source of the detrital sediment material exported to the ocean. Our results provide further compelling evidence that significant size-dependent geochemical decoupling can occur in river systems, accounting here for Nd isotopic (εNd) differences of up to eight epsilon-units between silt (&gt;25 μm) and colloidal...
Tipo: Text
Palavras-chave: Rare earth elements; Neodymium isotopes; Suspended particulates; Colloids; Murray-Darling Basin; Australia.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00610/72210/71005.pdf

Etude au microscope electronique a balayage des relations entre bacteries et matieres en suspension en milieu marin
Provedor de dados: 5
Autores: Cormier, M; Bassoulet, P; Pommepuy, Monique.
Near outfall areas numerous bacteria appear associated to colloidal organic matter present in littoral sea water. Arrangements into colonies are shown. Surface structures are observed which allow bacteria's attachment each to other and to organic matter.
Tipo: Text
Palavras-chave: Bacteria; Outfalls; Electron microscopy; Flocculation; Colloids; Adhesion; Suspended particulate matter.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-966.pdf

Iron isotope systematics in Arctic rivers
Provedor de dados: 5
Autores: Escoube, Raphaelle; Rouxel, Olivier; Pokrovsky, Oleg S.; Schroth, Andrew; Holmes, Robert Max; Donard, Olivier F. X.
The input of iron to the Arctic Ocean plays a critical role in the productivity of aquatic ecosystems and is potentially impacted by climate change. We examine Fe isotope systematics of dissolved and colloidal Fe from several Arctic and sub-Arctic rivers in northern Eurasia and Alaska. We demonstrate that the Fe isotopic (δ56Fe) composition of large rivers, such as the Ob’ and Lena, has a restricted range of δ56Fe values ca.–0.11 ± 0.13‰, with minimal seasonal variability, in stark contrast to smaller organic-rich rivers with an overall δ56Fe range from–1.7 to + 1.6‰. The preferential enrichment with heavy Fe isotopes observed in low molecular weight colloidal fraction and during the high-flow period is consistent with the role of organic complexation of...
Tipo: Text
Palavras-chave: Iron isotope; Colloids; River; Weathering; Arctic; Iron speciation.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00273/38402/36865.pdf

Charge sparsity: An index to quantify cation effects on clay dispersion in soils
Provedor de dados: 63
Autores: Melo,Thadeu Rodrigues de; Machado,Wesley; Tavares Filho,João.
ABSTRACT: Few approaches have been developed to measure the isolated effect of exchangeable cations on clay dispersion in soils. In this study, the charge sparsity (CS) index was proposed using the ratio between the cations hydrated ionic radius and valence. The index capacity to measure cation effects on clay dispersion in soils was also evaluated. Three Ferralsols, sampled at different sites in Paraná State, Brazil, were homoionized with Ca2+, Mg2+, K+, or Na+ prior to evaluation of the clay dispersion degree. Published independent data for two soils and clays were also used. We tested the capacity of CS and II, the latter proposed by Marchuck and Rengasamy (2011), to predict clay dispersion in soils. The CS predicted the dispersion degree more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colloids; Electrical double layer; Aggregation; Flocculation; Zeta potential.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101400