Benders'dictionary of nutrition and food technology

521Zollinger–Ellison syndrome Excessive secretion of gastric aciddue to high levels of circulating gastrin secreted by a pancreatictumour.zomotherapy Treatment of convalescents with raw meat or meatjuice, long since discontinued.zoopherin Obsolete name for vitamin b 12 .zooplankton See plankton.zucchini Italian variety of marrow developed to be harvestedwhen small. American and Australian name for courgette.Zucker rat A genetically obese strain of rat used in research.z value See decimal reduction time.zwieback German; twice-baked bread or rusk.zwitterions An ionised molecule with both positive and negativecharges, e.g. the amino acids.Zygosaccharomyces Yeasts that grow in high concentrations ofsugar (osmophilic) that cause spoilage of honey, jams, and syrups.zymase Obsolete name for the mixture of enzymes in yeast whichis responsible for fermentation.zymogens The inactive form in which some enzymes, especiallythe protein digestive enzymes, are secreted, being activated aftersecretion. Also called proenzymes, or enzyme precursors.zymotachygraph An instrument that measures the gas producedin a fermenting dough and the amount escaping from the dough,as an index of bread-making properties.