The first committed step in DNA biosynthesis occurs by direct reduction of
ribonucleotides. This reduction is catalyzed by ribonucleotide reductase (RNR), an
enzyme which uses a unique radical mechanism to facilitate the transformation. All four
DNA precursors are synthesized by a single enzyme. Therefore, an intricate pattern of
The accumulation of dieldrin and its effects on species composition of benthic algal communities were studied in laboratory
streams. Effects of dieldrin on photosynthetic and respiratory
rates of the blue-green alga Phormidium retzii were determined using
a Gilson Differential Respirometer.
Dieldrin concentrations ranging from 0.05 to 7.0 ppb were
Glutathione (GSH) is the predominant low molecular weight thiol antioxidant
in liver tissue. GSH plays an important role in maintaining the intracellular thiol redox
ratio as well as detoxification of electrophiles and xenobiotics. Aging leads to a significant decline (35%; P ≤ 0.05) in hepatocellular GSH levels. Using young (2-4...
While there is growing public concern over the safety
of the food supply, few studies have contrasted varying
perceptions of pesticide risk. This study assessed and
contrasted perceptions of three groups of Oregon State
University Extension Service clientele (home food
preservers, Master Gardener volunteers, commercial growers)
and factors influencing these...
Published January 1992. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Lactococcus lactis subsp. cremoris Ropy 352 and L. lactis
subsp. cremoris Hollandicus produce an exopolysaccharide (EPS) that
imparts commercially desirable textural and rheological properties
to fermented milk products. This ropy phenotype is expressed under
specific environmental conditions. A mucoid EPS phenotype, also
expressed under specific environmental conditions, but not involved...