Transport and retention of colloid tracers were evaluated in standard petrographic thin sections, prepared from saprolite (Cr horizons) formed from fractured sedimentary rocks, using epi-fluorescence microscopy. Thin sections prepared from dismantled hydrogeological columns revealed four domains of macropores with apparent apertures ranging from 1 to 500 Am. Colloid retention occurred within bo...

A series of column experiments was undertaken to explore the influence of colloid input concentration (2, 1, 0.5, and 0.25 times a reference concentration), colloid size (negatively charged 3.2 and 1.0 microm carboxyl latex), and sand grain size (360, 240, and 150 microm quartz sands) on transport and deposition. A similar mass of stable mono-dispersed colloids was added to each column. For a g...

While the relationship between intraocular pressure and plasma osmolarity has been investigated during hemodialysis, no research has been published concerning the relationship between intraocular pressure and plasma colloid osmotic pressure during hemodialysis. We describe a patient with neovascular glaucoma who demonstrated a marked decrease in intraocular pressure during hemodialysis. The pat...

In the subsequent 20-min interval after intra-aortic injection of these test solutions, capillary protein concentration remained at (isoncotic infusions) or returned to (colloid-free and hyperoncotic fluids) control values. Whereas reabsorption after colloid-free solutions returned to base line levels in parallel with the return in capillary protein concentration, after colloid infusions (which...

This was a preliminary evaluation of 90Y ferric hydroxide colloid for the Radiochemical Centre before using it in patients. Autoradiographs of rabbit knees, both inflamed and non-inflamed, showed that the material was evenly distributed in the synovium, and that there was no evidence of aggregation in vivo. Table I shows the retention of ferric hydroxide colloid in the knees of nine rabbits kil...

Poorly water-soluble drugs frequently solubilize into bile colloids and this natural mechanism is key for efficient bioavailability. We tested the impact of pharmaceutical polymers on solubilization interplay using proton nuclear magnetic resonance spectroscopy, dynamic light scattering, by assessing flux across model membranes. Eudragit E, Soluplus, a therapeutically used polymer, Colesevelam,...

We investigate the assembly of a binary mixture patchy colloids and droplets into crystal structures by use space-filling principle Metropolis Monte Carlo simulations. Here, with six patches in an octahedral symmetry attract droplets, whereas colloid-colloid droplet-droplet pairwise interactions are purely hard-core repulsions. Within parameter space regions that allow for stable crystals, we f...

Background: Hypotension is commonly occurred with Spinal anesthesia. Colloids and Crystalloids are used preoperatively to prevent hypotension. Objective: To examine the effect of fluid (crystalloid vs. colloid) preloading on hemodynamic stability in old patients planned for lower limb orthopedic operations spinal Patients methods: Eighty undergoing surgery under anesthesia were included this wo...

BACKGROUND It has been suspected that synthetic colloids may interfere with leukocyte adhesion by down-regulation of endothelial cell adhesion molecules. Although inhibition of endothelial inflammation might reduce leukocyte-related tissue injury, the same mechanism may be detrimental for host defense during severe infection. Regarding the widespread use of colloids, the authors performed a lab...

UNLABELLED The use of (99m)Tc-sulfur colloid lymphoscintigraphy for the determination of lymph flow patterns from a tumor site and localization of the sentinel node has been widely adopted. However, the effects of multiple injections of the radiopharmaceutical can range from mild discomfort to pain. pH-adjusted lidocaine HCl coadministered with (99m)Tc-sulfur colloid presents a risk of introduc...