Search results for "Bead"

CADMIUM AND COPPER SORPTION ON PECTIN ENCAPSULATED IN CALCIUM ALGINATE BEADS

2008

Pectin is an acidic polysaccharide constituted by monomer units of galacturonic acid. It is a main component of peel fruits where is present as protopectin. Due to the presence of a high number of carboxylic binding sites in its structure, pectin (Pect) shows a good sequestering capacity towards metal ions. Pectin has been proposed as a sorbent to remove metal ions from aqueous solutions. In this work the ability of pectin on solid phase to remove Cd(II) and Cu(II) from aqueous solutions has been evaluated. To this end, a powder of a commercial pectin, (esterified potassium salt from Citrus fruit) was encapsulated in a polymeric matrix of calcium alginate (CA) at different ratios of pectin …

Kinetic and equilibrium studies for uranyl removal from aqueous solution by adsorption onto alginate gel beads. DPV and ICP measurements

2014

Settlement, radiocarbon dates and craft productions during Late Neolithic and Bell Beaker periods in the ‘corredor de Montesa’ (Valencia, Spain). The…

2014

[EN] In this paper we present the results related to the excavation works conducted in Late Neolithic and Bell Beaker sites of Quintaret (Montesa, Valencia) and Corcot (l’Alcúdia de Crespins, Valencia), both in the middle valley of Canyoles river. The sites, neighboring each other, offer a quite different volume of information (Quintaret: 51 structures; Corcot: 4 structures). 14C dates allow us to define the occupation of this area of the valley along the first half of the III millennium cal BC. The presence of bell beaker ceramic in archaeological record of Quintaret is limited to just one structure (Q138), where at least 7 different vessels have been identified. Other prominent point of t…

Cryopreservation of white mulberry (Morus alba L.) by encapsulation-dehydration and vitrification

2011

Shoot apices of in vitro-grown plantlets of white mulberry, Morus alba L. cv Florio, were cryopreserved using either encapsulation-dehydration or vitrification. For encapsulation-dehydration, alginate beads containing apices were dehydrated for 1, 3, 5 or 7 days in a liquid medium containing various sucrose concentrations (0.5, 0.75, 1.0 or 1.25 M). Bead desiccation was performed using silica gel for either 0, 4, 6, 8, 9 or 14 h. For vitrification, apices were directly immersed for either 5, 15, 30 or 60 min in a vitrification solution (PVS2). Following encapsulation-dehydration, treatment of alginate beads with 0.75 M sucrose was more effective in promoting re-growth of explants after imme…

Design and prototyping of a magnetic actuator based permanent magnets for microbead navigation in viscous environment

2017

International audience; For actuating the magnetic microrobots, two types of magnetic actuation technologies have been used during the last past years. These magnetic technologies may be either electromagnetic coils or permanent magnets based systems. This second solution is not the most used by researchers, because of the difficulties to control the magnetic force. In this paper we propose a magnetic actuator prototype based on permanent magnets. In addition to the magnets, the actuator is also composed of a mechanical structure. This structure is used for positioning the permanent magnets, which allows to control the magnetic force generated by the actuator. We demonstrated in simulation …

Stability of irinotecan-loaded drug eluting beads (DC BeadTM) used for transarterial chemoembolization

2009

Purpose. The aim of this study was to determine the loading efficiency, physicochemical stability, and release of irinotecan-loaded DC BeadsTM (bead size 100—300 μm, 300—500 μm) before and after mixing with nonionic contrast medium (Accupaque® 300, Imeron® 300, Ultravist ® 300) during a prolonged period of time (28 days) when stored at room temperature or refrigerated. Methods. DC Beads TM were loaded with 50 mg irinotecan (Campto®) per milliliter beads in a 2 h loading period. Drug loading efficiency and stability were determined by measuring the irinotecan concentration in the excess solution. A free-flowing in vitro elution method for a period of 2 h and phosphate buffered solution (PBS…

The warping torsion as a sequence of infinite bending problems

2014

[EN] In the present article, a methodology for teaching modeling problem of mixed torsion for thin-walled open sections. The mathematical analogy of warped twist as a problem of Euler-Bernoulli beams is exploited. In fact, the paper proposes to represent the warped torsion differential equation as a perturbation of the pure torsion or also called the Saint-Venant theory. Thus, it is demonstrated that under certain conditions related to the value of the torsional slenderness the response of a beam is the addition of infinite pure warped problems, that is, infinite bending problems, according to the analogy. We call this the asymptotic torsion analogy.

In Vitro Stimulation and Expansion of Human Tumour-Reactive CD8+ Cytotoxic T Lymphocytes by Anti-CD3/CD28/CD137 Magnetic Beads

2011

Adoptive immunotherapy with tumour-reactive CD8(+) cytotoxic T lymphocytes (CTLs) requires efficient in vitro approaches allowing the expansion of CTLs to large numbers prior infusion. Here, we investigated the antigen-independent activation and the expansion of human T cells in peripheral blood mononuclear cells (PBMCs) and in tumour-reactive CTLs using Dynabeads coated with monoclonal antibodies to CD3 and to the costimulatory molecules CD28 and CD137 (4-1BB). T cells in PBMCs showed an increased expansion rate of 15- to 17-fold during a 2-week culture period using antibody-conjugated beads with interleukin-2 (IL-2) added versus IL-2 alone. No significant difference between CD3/CD28 beads…

Static and Dynamic Properties of Adsorbed Chains at Surfaces:  Monte Carlo Simulation of a Bead-Spring Model

1996

The adsorption of flexible polymers from dilute solution in good solvents at attractive walls is studied by Monte Carlo simulation of a coarse-grained off-lattice model, varying chain length N and ...

Les sépultures de Truchtersheim "Holderacker" (Bas-Rhin) et les pratiques funéraires du Bronze A1 dans le sud de la plaine du Rhin supérieur

2023

Die Freilegung 2019 eines kleinen frühbronzezeitlichen (2030-1900 v. Chr.) Bestattungsensemblesin Truchtersheim „Holderacker“, etwa 12 km nordwestlich von Straßburg, hat uns bewegt uns mit der gesamten für das Elsassverfügbaren Dokumentation der frühbronzezeitlichen Bestattungssitten zu befassen. Dieser bisher kaum dokumentiertechronologische Horizont wurde kürzlich durch eine Reihe von Funden bereichert, die vorwiegend zwischen 2017 und 2019bei präventivarchäologischen Operationen im Vorfeld der Bauarbeiten der Westumgehung von Straßburg entdeckt wurden.Das bescheidene regionale Corpus mit 20 Gräbern erlaubt nur begrenzte Beobachtungen, es weist jedoch doch mehrere für dieFrühbronzezeit ch…