In the past forty years considerable progress has been achieved on the knowledge of human blood as a non-Newtonian shear-thinning suspension, whose initial state, that is at rest (stasis) or at very low shear rates, has a gel-like internal structure which is destroyed as shear stress increases. The main goal of this communication is to describe the role of geometrical aspects during RBC (red bl...

We simulate a suspension of model colloidal particles interacting via DLVO (Derjaguin, Landau, Vervey, Overbeek) potentials. The interaction potentials can be related to experimental conditions, defined by the pH-value, the salt concentration and the volume fraction of solid particles suspended in the acqueous solvent. Depending on these parameters, the system shows different structural propert...

introduction: suspension of isolated hepatocyes is now being used in an increasing number of biochemical investigations, including drug metabolism and toxicity studies. isolated hepatocyes, retain many of the essential properties of the intact tissue including permeability charactreristics. material and methods: in this method at first liver is subjected to a nonrecirculating perfusion with cal...

BACKGROUND Extracts and products (roots and/or aerial parts) from Echinacea ssp. represent a profitable market sector for herbal medicines thanks to different functional features. Alkamides and polyacetylenes, phenols like caffeic acid and its derivatives, polysaccharides and glycoproteins are the main bioactive compounds of Echinacea spp. This study aimed at investigating the capacity of selec...

A knowledge of the behavior of chondrocytes in culture is relevant for tissue engineering. Chondrocytes dedifferentiate to a fibroblast-like phenotype on plastic surfaces. Dedifferentiation is reversible if these cells are then cultured in suspension. In this report a description is given of how when chondrocyte aggregates formed in suspension are next seeded on plastic, most of them attach as ...

Strategies are needed to improve repopulation of decellularized lung scaffolds with stromal and functional epithelial cells. We demonstrate that decellularized mouse lungs recellularized in a dynamic low fluid shear suspension bioreactor, termed the rotating wall vessel (RWV), contained more cells with decreased apoptosis, increased proliferation and enhanced levels of total RNA compared to sta...

The relation between games and simulations can be profitably investigated by combining ontological tools and recent neurological findings. Neurology shows that simulations are connected to fiction or to reality by a suspension of disbelief or alternatively a suspension of belief, and ontological categories of Mimesis (simulation of an event or an object) and Catharsis (simulation of the experie...

e study the dynamics of elongated axisymmetric particles undergoing shear flow between two arallel planar walls, under creeping-flow conditions. Particles are modeled as linear chains of ouching spheres and it is assumed that walls are separated by a distance comparable to particle ength. The hydrodynamic interactions of the chains with the walls are evaluated using our artesian-representation ...

Chloroplasts produce reactive oxygen species (ROS) during cellular stress. ROS are known to act as regulators of programmed cell death (PCD) in plant and animal cells, so it is possible that chloroplasts have a role in regulating PCD in green tissue. Arabidopsis thaliana cell suspension cultures are model systems in which to test this, as here it is shown that their cells contain well-developed...

A strain of Blastomyces dermatitidis, originally isolated from soil (Denton et al., Science 133: 1126, 1961), was grown in sterile, rich, garden soil in a laboratory-model terrarium developed for ecological studies of pathogenic fungi. An 8-g sample of the infected soil was suspended in 50 ml of physiological saline in a test tube (38 X 200 mm), agitated vigorously, and allowed to settle for 1 ...