Phenotypic identification of Porphyromonas gingivalis validated with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry.

Objective: Porphyromonas gingivalis is a major bacterial pathogen in human periodontitis. This study used matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry to assess the accuracy of a rapid phenotypic identification scheme for detection of cultivable P. gingivalis in human subgingival plaque biofilms.

A structural model examining the relationship between physical child abuse, sexual victimization, and marijuana/hashish use in delinquent youth: a longitudinal study.

A structural model of the relationships among physical abuse and sexual victimization experiences, marijuana/hashish use (measured by self-report and urine test data) and self-reported delinquent behavior (theft crimes, index offenses, crimes against persons, drug sales and total delinquency) over time was tested in a longitudinal study of juvenile detainees. The hypothesized model was supported by the data. Theoretical, research and policy implications of the results are drawn.

Recidivism among high risk youths: a 2 1/2-year follow-up of a cohort of juvenile detainees.

We report some results from a longitudinal study of juvenile detainees. Analyses were directed toward determining whether the youths' alcohol or other drug use and their emotional/psychological problems at entry into the detention center predicted subsequent arrests for new offenses during the 24 and 30 months following their initial interviews. Statistically significant relationships were found between the youths' demographic characteristics (age, race, gender), referral history, reason for placement in the detention center, cocaine use (as measured by urinalysis), and recidivism.

Recidivism among high-risk youths: study of a cohort of juvenile detainees.

We report some results from an ongoing, longitudinal study of juvenile detainees. Analyses were directed toward determining whether the youth's alcohol or other drug use and their emotional/psychological problems at entry into the detention center predicted subsequent arrests for new offenses. Statistically significant relationships were found between the youths' demographic characteristics (age, race, gender), referral history, reason for placement in the detention center, and cocaine use (as measured by urinalysis) and recidivism.

Juvenile crime and drug abuse: a prospective study of high risk youth.

Results from an ongoing, longitudinal study of juvenile detainees focusing on the relationship between their drug use and delinquency/crime, are summarized. Three hundred and ninety-nine youths were first interviewed in 1986/87, and 41 percent were found to be urine positive for recent drug use at the time of detention. We reinterviewed 305 of the youths approximately one year later, and found their drug use and delinquency persisted, and in some cases increased, over time.