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At least 667 records · Page 37Linked to original sources
PubMed1993

Carbonic anhydrase type II in regenerating retinal pigment epithelium. A histochemical study in the rabbit.

Type II carbonic anhydrase (CAII) in the cytoplasm of the retinal pigment epithelium (RPE) may contribute to the transport of water and solutes across the RPE. The activity of this enzyme in RPE during its response to damage, e.g., during regeneration, is therefore of interest in understanding retinal disease. Immuno-histochemistry was used to compare CAII activity of normal RPE and RPE experimentally induced to regenerate. In normal rabbits, the RPE stained intensely with a peroxidase-linked antibody specific for human CAII. Regenerating RPE stained less intensely. Within the regenerating epithelium, staining appeared more intense in mature cells than in immature ones, suggesting that CAII activity gradually returns during RPE regeneration.

Animals↗
PubMed2000

Determination of nicotinamide (NA) using its polarographic catalytic wave in the presence of KIO3.

Nicotinamide (NA) yields a polarographic catalytic wave with a peak potential -1.38 V (vs. SCE) in 0.1 mol/L HAc-NaAc (pH 4.7)/4 x 10(-3) mol/L KIO3 buffer solution. The sensitivity of the catalytic wave increased in one order of magnitude as compared to that of the responding reduction wave without KIO3. Based on this observation, a new method for the determination of NA was recommended. The second order derivative peak current was proportional to the NA concentration in the range of 5 x 10(-8)- 6 x 10(-7) mol/L. 0.11-fold vitamin B1, 0.13-fold B2, 0.14-fold B6 and 8-fold nicotinic acid amounts do not interfere the determination of 1 x 10(-6) mol/L NA. The proposed method was used to determine the NA content in multivitamin tablets, with good agreement to the declared amount.

Hydrogen-Ion Concentration↗
PubMed1985

All-reagent test tablets and method for rapid and selective alpha-amylase iodometric determination.

The new type of test tablets (Iodocrom) for alpha-amylase assay contain crosslinked (CL)-amylose or CL-starch (specific substrates for alpha-amylase only) and the reagent (KIO3/KI) generating iodine (in acidic medium, when the reaction is stopped). The method--amyloclastic in nature--is based on selective action of alpha-amylase on the CL-substrate liberating soluble polysaccharide chains large enough and in a conformation suitable to allow the formation of iodine inclusion complexes. Unlike the classical iodometric methods, the reaction is followed by an increase in iodine complex blue color. The method has some common points with the well-known chromogenic (e.g., Phadebas) methods. Both use insoluble substrates which are not susceptible to attack by exoamylases and in both cases the enzymatic reaction is followed by the release of soluble products. The amounts of these released chains and the absorbances of their inclusion complexes with iodine are in a linear dependence with the enzyme concentration (activity).

Humans↗
PubMed1981

Design considerations of the acousto-optic light deflector.

Theoretical analysis of the performance of the acousto-optic light deflector is described. Detailed calculations for LiIO3--SF6 glass structure including the influence of the bonding layer and Q-factor on the frequency response of the deflector are presented. A method of increasing the bandwidth in the presence of the bonding layer is given.

Acoustics↗