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Time series are presented for the Class II methanol maser source G12.89+0.49, which has been monitored for nine years at the Hartebeesthoek Radio Astronomy Observatory. The 12.2 and 6.7 GHz methanol masers were seen to exhibit rapid, correlated variations on time-scales of less than a month. Daily monitoring has revealed that the variations have a periodic component with a period of 29.5 d. The period seems to be stable over the 110 cycles spanned by the time series. There are variations from cycle to cycle, with the peak of the flare occurring anywhere within an 11 d window, but the minima occur at the same phase of the cycle. Time delays of up to 5.7 d are seen between spectral features at 6.7 GHz and a delay of 1.1 d is seen between the dominant 12.2 GHz spectral feature and its 6.7 GHz counterpart. [ABSTRACT FROM AUTHOR]

This exploratory, quantitative study investigated the prevalence rate of patients with co-occurring substance-related and psychiatric disorders (CODs) at a private rehabilitation centre in Johannesburg, South Africa. Details of the case histories of the clients were collected, coded and analysed using Statistical Analysis System (SAS). The results indicated that 57.1% of 419 clients had one or more co-occurring psychiatric disorder, along with a substance-related disorder. Of the 239 with a COD, 155 had a mood disorder, 40 had an anxiety disorder, 39 had ADHD, 35 had an eating disorder, eight had a conduct disorder and five had schizophrenia. Statistically significant relationships were found for ADHD with cannabis-related disorders and polysubstance dependence; anxiety-related disorders with alcohol-related disorders; and mood disorders with cocaine-related disorders, possibly substance-induced disorders and substance-induced disorders. These results showed that a large group of patients admitted at the centre had one or more COD and this made the treatment more complex. The results of this study suggest the need to develop specialized treatment programmes for patients with CODs. [ABSTRACT FROM AUTHOR]