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Helen A. Stafford

University of Chicago

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Featured researches published by Helen A. Stafford.

Archives of Biochemistry and Biophysics | 1953

Alcohol dehydrogenase of wheat germ

Helen A. Stafford; Birgit Vennesland

Abstract Evidence is presented that extracts of wheat germ contain alcohol dehydrogenase(s) catalyzing the reduction of both TPN and DPN by a variety of alcohols. The enzyme reaction is completely inhibited by 10−2 M iodoacetate. Because of the presence of this enzyme activity, the TPN-dependent oxidation of hexose phosphates may be coupled with the reduction of acetaldehyde. A procedure is described for following such coupled reactions by measuring acid formation manometrically in bicarbonate-CO2 mixtures.

Plant Physiology | 1991

Flavonoid Evolution: An Enzymic Approach

Helen A. Stafford

Plant Physiology | 1960

Differences Between Lignin-like Polymers Formed by Peroxidation of Eugenol and Ferulic Acid in Leaf Sections of Phleum

Helen A. Stafford

Plant Physiology | 1965

Flavonoids and related phenolic compounds produced in the first internode of Sorghum vulgare Pers. in darkness and in light.

Helen A. Stafford

Plant Physiology | 1984

Flavan-3-ol Biosynthesis : The Conversion of (+)-Dihydroquercetin and Flavan-3,4-cis-Diol (Leucocyanidin) to (+)-Catechin by Reductases Extracted from Cell Suspension Cultures of Douglas Fir.

Helen A. Stafford; Hope H. Lester

Journal of Biological Chemistry | 1954

The enzymatic reduction of hydroxypyruvic acid to D-glyceric acid in higher plants.

Helen A. Stafford; Anna Magaldi; Birgit Vennesland

Plant Physiology | 1982

Enzymic and nonenzymic reduction of (+)-dihydroquercetin to its 3,4,-diol.

Helen A. Stafford; Hope H. Lester

Plant Physiology | 1985

Flavan-3-ol Biosynthesis The Conversion of (+)-Dihydromyricetin to Its Flavan-3,4-Diol (Leucodelphinidin) and to (+)-Gallocatechin by Reductases Extracted from Tissue Cultures of Ginkgo biloba and Pseudotsuga menziesii

Helen A. Stafford; Hope H. Lester

Plant Physiology | 1952

THE DISTRIBUTION IN HIGHER PLANTS OF TRIPHOSPHOPYRIDINE NUCLEOTIDE-LINKED ENZYME SYSTEMS CAPABLE OF REDUCING GLUTATHIONE

David G. Anderson; Helen A. Stafford; Eric E. Conn; Birgit Vennesland

Plant Physiology | 1962

Histochemical & Biochemical Differences Between Lignin-Like Materials in Phleum pratense L.

Helen A. Stafford

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Hope H. Lester

Reed College

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Birgit Vennesland

University of Chicago

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Frank A. Loewus

Washington State University

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Mark A. Brown

Reed College

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