Effects of Hyperoxia on the Nucleic Acid Contents of Developing Brain
Prolonged exposure of the newborn to elevated concentrations of exygen may intiate pathlogic changes in teh retina, but, except for inhibition of capillary growth, no abnormalities have been described in brain. Ambient hyperoxia has been reported to inhibit nucleic acid synthesis in mammalian tissue cultures. The present studies suggest that hyperoxia may have similar effects in the developing brain in vitro. Newborn puppies were bottle-raised in 80% oxygen; weight-matched littermates were raised similarly in air. Over a nine-day period the mean weight gain was the same in both groups. Three days after termination of the oxygen exposure cerebral cortex and white matte were analyzed for DNA and RNA contents. The results obtained in nine pairs of animals were as follows:
Abstract Not Available – First paragraph follows: ::: Previous field studies of soil fertility effects on the processing quality of tomatoes have been inconclusive. To adequately assess the relationship of various nutrients to fruit quality, it is necessary to more closely control the nutrition of the plant. Therefore, techniques were developed and a series of experiments were initiated in the greenhouse to study the effect of individual nutrients on pH, soluble solids, and color, as well as on yield. This article analyzes the effect of one nutrient–nitrogen–on tomato processing quality.