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In baby mice whose mothers were exposed to ultrasound for 30 minutes or longer during pregnancy , a small but significant number of nerve cells did not migrate to their proper locations in the brain , Yale University researchers reported in this week 's Proceedings of the National Academy of Sciences . 4-257 ] have also demonstrated dose-dependent increases in sister chromatid exchange frequencies in bone-marrow cells of mice exposed to cigarette smoke for 2 weeks . Nuclear reaction analysis measurement of the uptake of O during the ion exchange process for an alumina silicate glass exposed to solution for differing amounts of time . " In baby mice whose mothers were exposed to ultrasound for 30 minutes or longer during pregnancy , a small but significant number of nerve cells did not migrate to their proper locations in the brain , Yale University researchers reported in this week 's Proceedings of the National Academy of Sciences . An experiment using oysters harvested from cold Connecticut waters showed that V. vulnificus could not be resuscitated when exposed to 25xC seawater for 48 hours , indicating that V. vulnificus dies after prolonged exposure ( 22 ) . The molecules need not all have stayed exposed to UV for long .