Freshly cut slices darken as a result of oxidation of endogenous phenols in reactions catalyzed by polyphenol oxidase. Ascorbic acid, thiols, and other reducing substances prevent enzymic darkening (5, 17). Earlier studies showed that ATP substantially decreased browning in plant tissues, apparently via the reduction of quinones (14). ATP itself is not a reducing agent. The reducing compound is...

A method for quantifying the effect of medium composition on the diffusive mass transfer of hydrophobic organic chemicals through thin layers was applied to plant tissue. The method employs two silicone disks, one serving as source and one as sink for a series of PAHs diffusing through thin layers of water, potato tissue, and carrot tissue. Naphthalene, phenanthrene, anthracene, and fluoranthen...

and petiole, the interveinal tissue did not reach tritium equality with major veins, the stem, or the external solution. Water of the interveinal tissue maintained a stable tritium content at 60 to 70 % of external concentration for long periods. The pattern of results obtained was similar in sunflower and tobacco. Tritium content of leaf-tissue water vapor transpired by the canopy of an intact...

The me-chanism by which the reversible conversion of starch ito sucrose takes place in potato tubers exposed t,o cold is as yet essentilally unknown. Early 'studies on the subjectt tried to correllate this conversion with va,riations in the activity of related enzymes (10). Those responsible for the synthesis of sucrose and sticrose-6--phosphiate (1) are undoubtedly highly relevant. In add'itio...

LiCI-extraction of RNAs from isolated ribosomes, however, destroys the coding properties of mRNAs (as has been shown with cerebral mRNA; P. MANDEL, pers. comm.). Therefore separation of mRNAs from ribosomes was achieved by EDTA. If isolated ribosomes from intact potato tubers are dissociated into subunits and RNAs by EDTA, sucrose density gradient profiles show the presence of the 60Sand 40S-su...

HIGHLIGHTS The slices of different thickness in experiment is 0.2mm, 0.3mm, 0.4mm and 0.5mm using electric wooden slicer. suitability temperature for acceptance chip colour best at 170 C 180 °C except 190 °C. Reduction oil absorption maximum slice 0.5mm. After processing, reducing sugars content reduced by 77.9 % 81.1 180°C with 0.2mm variety Kufri Chipsona-1 Chipsona-3. Processed chips retaine...