1. The theory of electrical conductance of colloidal suspensions has been extended to cover the case of ellipsoids with three axes different. 2. The results have been applied to suspensions of ellipsoidal erythrocytes of birds. 3. It has been shown that fluctuations in electrical resistance of suspensions of erythrocytes after stirring are due to streaming orientation of the cells. 4. The theor...

We perform experiments on two different dense colloidal suspensions with confocal microscopy to probe the relationship between local structure and dynamics near the glass transition. We calculate the Voronoi volume for our particles and show that this quantity is not a universal probe of glassy structure for all colloidal suspensions. We correlate the Voronoi volume to displacement and find tha...

The various interaction forces that govern the stability/flocculation of concentrated suspensions are briefly described. Combination of these interactions result in three main energy-distance curves which determine the final state of the suspension. This ranges from colloidally stable to strongly flocculated (coagulated) suspensions. A schematic representation of the various states of suspensio...

Dispersion of objects in a fluid phase can be classified as solutions (Gibbs free energy mixing, ?Gmix < 0) or suspensions (?Gmix > depending on their thermodynamic stability. Small tend to form solutions, larger ones suspensions, e.g., molecules versus micrometer-sized colloids. Proteins and nanomaterials fall between these two size regimes. The long-standing issue whether proteins nanoparticl...

Aerosols composed of viable particles of a uniform size were produced with a commercial spinning-disc generator from aqueous suspensions of Bacillus subtilis var. niger spores containing various amounts of an inert material, dextran, to regulate aerosol particle size. Aerosols composed of single naked spores having an equivalent spherical diameter of 0.87 mum were produced from spore suspension...

Suspensions of Ehrlich ascites mouse tumor cells were exposed in vitro to 02 at 75-80 pounds/sq in guage for periods of from 12 to 24 hr. Control suspensions were exposed to air at atmos pheric pressure, O2 at atmospheric pressure, and air at high pres sure. It was found that 02 at high pressure has a deleterious action on these cells, as manifested by: increased numbers of damaged cells in the...

Mixtures of clay and sand suspended in water are complex systems encountered many industrial environmental applications, but their understanding modelling still limited require further investigations. In this way, the rheological behaviour pure non-thixotropic coarse-grained suspensions is investigated with a rotational rheometer equipped by an inclined blade vane-in-cup, where type volume frac...

background hemolyis of red blood cells is a serious toxic effect commonly found among patients envenomed by hemiscorpius lepturus scorpion. objectives the aim of the present study was to evlaute the efficay of the avaible polyvalent antivneom in preventing this phenomena. materials and methods using a red blood cell fragility test, the anti-hemolytic effectiveness of a new antivenom serum again...

The deflocculation effect of conventional additives to kaolin suspensions is evaluated from the results standard rheological measurements. Several widely used electrolytes (NaOH, Na2C03, Na2Si03, SHMP = sodium hexametaphosphate, and CMC = sodium salts of carboxymethylcellulose) have been tested. The optimal concentrations of these deffloculants, in respect to reaching the maximum reduction of i...

The inhibitory effect offluorapatite (FAP)-derivedfluoride upon resting cell suspensions of Streptococcus mutans incubated at pH 4.5 and 6.5 was studied using lactic acid production from 0.1% sucrose as an indicator offermentation activity. Cells incubated with FAP produced significantly less lactic acid than did cells incubated with hydroxyapatite (HAP). Addition of HAP to cell suspensions con...