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Davidson ’ s findings appear in the December issue of the Journal of Ecological Applications . The study , which will be published in the December issue of Nature Medicine , indicates that nitrite can be converted into nitric oxide , a compound known to expand blood vessels and regulate the circulatory system . In the December 1 , 2001 issue of the Journal of Neuroscience , the same team of researchers reports that methamphetamine-damaged brain cells may recover after prolonged abstinence from the drug . Table 5 shows there was a marked drop in the proportion of gambling as a percentage of turnover for Victoria in the December quarter 2002 coinciding with the introduction of restrictions on smoking in Hotels and licensed clubs . The results will appear in the December issue of R.O.B .