A fundus camera dedicated to the screening of diabetic retinopathy in the primary-care physician's office.

Purpose: To increase the number of diabetic patients being screened for retinopathy, an instrument, the DigiScope, was specifically designed to operate in primary-care physicians' offices. The DigiScope is described and its automated functions are evaluated.

Methods: The DigiScope consists of a semiautomated optical head to acquire fundus images, evaluate visual acuity, and transmit the data to a remote reading center through telephone lines.

Influence of oxygen adsorption on the dynamic K(L)a measurement in three-phase slurry reactors.

To check for possible mass transfer limitations of oxygen and/or carbon dioxide in kinetic experiments on microbial desulphurization of coal, it is important to properly measure the volumetric mass transfer coefficient (k(L)a) especially at high slurry densities. Volumetric mass transfer coefficients of oxygen, at different solid hold-up values (epsilon(s) = 0 to 0.28) of coal slurries (d(par) < 100 * 10(-6) m), were measured in a lab scale fermentor and in a lab scale pachuca tank, using the dynamic gas-liquid absorption method.

Action of benzocaine on sodium channels of frog nodes of Ranvier treated with chloramine-T.

Single myelinated nerve fibres of the frog Rana esculenta were voltage clamped in solutions containing 10 mM TEA to block potassium channels. Reduction of peak INa was measured after equilibrating the membrane in solution containing benzocaine between 0.025 and 2.