Eastman-Kodak Company

Chung-yuan Chen

Patricia M Scensny

Roger L Lok

Robert T Belly

Jon N Eikenberry

Annie L Wu

The invention is generally accomplished by providing a method of finishing an emulsion comprising providing silver halide grains, adding to said emulsion in an amount between about 0.005 mmol/per mole of silver and 0.10 mmol/per mole of silver of the compound ##STR1## X=O, S, Se; R.sub.1 =alkyl or substituted alkyl or aryl or substituted aryl;

Class of compounds which increases and stabilizes photographic speed

A method for attaching a reactive amine- or sulfhydryl-containing compound to polymeric particles using dication ether salts is disclosed.

Attachment of compounds to polymeric particles using dication ethers and

Hydrolyzable substrates comprise blocked moieties which, when cleaved from the substrate during hydrolysis, provide electron transfer agents. The released electron transfer agents can be recycled between a reductant and a reducible compound that upon reduction provides a detectable species. Alternatively, they can be recycled between an oxidant and an oxidizable compound that upon oxidation provides a detectable species. These substrates are useful in analytical compositions, elements and methods for the determination of hydrolytic analytes, such as hydrolytic enzymes or biological cells containing such enzymes.

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Rochester, NY, United States of America

Chung-yuan Chen