Search results for "Colloid"

Human primary macrophages scavenge AuNPs and eliminate it through exosomes. A natural shuttling for nanomaterials.

2018

Abstract The use of nanomaterials is increasing but the real risk associated with their use in humans has to be defined. In fact, nanomaterials tend to accumulate in organs over a long period of time and are slowly degraded or eliminated by the body. Exosomes are nanovesicles actively shuttle molecules, including chemical products and metals, through the body. Macrophages scavenge the body from both organic and inorganic substances, and they use to release high amounts of exosomes. We hypothesized that macrophages may have a role in eliminating nanomaterials through their exosomes. We treated human primary macrophages with 20 nm gold nanoparticles (AuNPs), analyzing the presence of AuNPs in…

Les colloïdes solubles du vin de champagne. Relation avec le « remuage »

1978

<p style="text-align: justify;">Dans ce travail on étudie un échantillonnage de vins de champagne, en vue d'établir une relation entre leur composition en colloïdes et la facilité du « remuage ».</p><p style="text-align: justify;">Après champagnisation, les teneurs en colloïdes totaux sont toujours supérieures à celles des vins tranquilles correspondants. Plus la durée de clarification et de remuage est grande plus la teneur en colloïdes est élevée.</p><p style="text-align: justify;">Le fractionnement des colloïdes glucidiques solubles, en quatre fractions, sur Sépharose 6 B montre que celle de plus haut poids moléculaire a l'influence la plus directe sur les d…

The role of mucilage of Opuntia ficus-indica Mill. on sweet cherry fruit during storage

2022

Sweet cherry (Prunus avium L.) is an important crop from temperate areas and is widespread and much appreciated by the consumers when the pedicel is green. The objective of this work was to evaluate the quality of sweet cherry fruit treated with a mucilage coating, extracted from cladodes of Opuntia ficus-indica L. Mill (OFI). The cultivar ‘Ferrovia’ was harvested at the commercial ripeness stage from an orchard in Puglia (Italy), stored for 14 days at 2°C and RH 92% and to evaluated by the variation of color and other qualitative parameters such as physical-chemical, nutraceutical and sensory analysis. Fruits were transferred at 10°C to postharvest laboratory of University of Palermo after…

Qualitative traits and shelf life of fig fruit (cv Melanzana) treated with Aloe vera gel coating

2021

The fig (Ficus carica L.) cv Melanzana is typical of Southern Italy. This cultivar produces breba fruit in June and fig fruit in August. Some previous studies on the use of coatings extracted from stems of Aloe vera showed positive effects to maintain fruit quality during shelf life. However, there are no studies on breba fig fruit treated with Aloe vera coating. In this study breba fig fruit, cv Melanzana, was treated with an application of Aloe vera gel, sealed in macro-perforated bag and stored at 5°C for 10 days. The effect of application of the Aloe vera gel on the shelf-life of this fruit, and its quality attributes after application were evaluated measuring fresh weight, total solubl…

FOLATE-MEDIATED TARGETING OF POLYMERS AS COMPONENTS OF COLLOIDAL DRUG DELIVERY SYSTEMS

2009

PREPARATION AND CHARACTERIZATION OF CURCUMIN-LOADED LIPID NANOPARTICLES WITH IMPROVED ANTI-CANCER THERAPEUTIC EFFICACY

2011

NANODEVICES FOR THE TARGETED DRUG AND GENE DELIVERY

2008

Growth and anisotropic ripening in twinned colloidal crystals

2008

The heterogeneous crystallization of colloidal suspensions of Yukawa particles on a wall was observed by Bragg microscopy. The growth velocity ν 110 of the fluid-crystal interface can be very well described by a Wilson-Frenkel growth law, while the limiting velocity is found to be lower than in previous investigations. Twinned bcc domains in lateral direction (parallel to the wall) and their ripening behavior are for the first time investigated systematically. A strong anisotropic growth behavior is found: in the direction of the shear flow, which shear melts the suspension prior to the crystallization process, the extension of the domains is much larger than perpendicular to that. The incr…

Confined Crystals on Substrates: Order and Fluctuations in Between One and Two Dimensions

2010

The effect of lateral confinement on a crystal of point particles in d = 2 dimensions in a strip geometry is studied by Monte Carlo simulations and using phe- nomenological theoretical concepts. Physically, such systems confined in long strips of width D can be realized via colloidal particles at the air-water interface, or by adsorbed monolayers at suitably nanopatterned substrates, etc. As a generic model, we choose a repulsive interparticle potential decaying with the twelfth inverse power of distance. This system has been well studied in the bulk as a model for two- dimensional melting. The state of the system is found to depend very sensitively on the boundary conditions providing the …

Effective charges along the melting line of colloidal crystals

2006

The shear modulus G of charged colloidal crystals was measured at several constant particle densities n and varying salt concentrations c up to the melting salt concentration cM using torsional resonance spectroscopy. Far from the phase boundary the samples are polycrystalline and the shear modulus stays roughly constant as a function of c. Upon approaching the melting transition an increasing amount of wall based crystal material is formed surrounding a shrinking polycrystalline core and G drops nearly linearly. When the transition is complete G again stays constant. The morphologic transitions may be scaled upon a single master curve. For the polycrystalline morphology, the elastic data a…