Risky sexual behavior in college students: Relationships between number of sexual partners,disclosure of previous risky behavior,and alcohol use

To examine relationships between disclosure of previous sexually risky behavior to current sexual partners, multiple sexual partners, condom and alcohol use, and vulnerability to Acquired Immunodeficiency Syndrome, an anonymous survey was administered to 427 unmarried undergraduates. Of the 262 sexually active students (66%), one third reported having more than one sexual partner in the prior 11 weeks and three fourths reported inconsistent or no condom use. Failure to disclose having previous sexual partners, not using condoms, and testing positive for human immunodeficiency virus (HIV) or other sexually transmitted diseases (STDs) was common among both men and women. Students with multiple sexual partners were less likely to disclose about previous partners and about failure to use condoms, and more likely to use alcohol prior to sexual activity. Although 40.8% of respondents said they did not use or were less likely to use condoms while drinking, no relationship between alcohol and condom use assessed during the last discrete incident was found. College students continue to engage in sexual activity that puts them at risk for contracting HIV and other STDs. Self-disclosure about past risky behavior, when it occurs, does not appear to lead to higher levels of condom use.The authors contributed equally to this study.Received Ph.D. from West Virginia University. Research interests: AIDS prevention, community-based behavior change, and women in higher education.Received Ph.D. from University of California, Davis. Research interests: Cognitive neuroscience, attention, and alternate states of consciousness.     

Stable isotope ratios as a tool in microbial forensics--part 3. Effect of culturing on agar-containing growth media

Stable isotope ratios of hydrogen and oxygen in microbes have been shown to be functions of the corresponding isotope ratios of the water with which the culture medium was prepared, and thus to contain a potential geographic signal. Water can evaporate from agar (solid) media during culturing, changing its isotope ratios. Here we describe the effect of drying on the isotope ratios of water extracted from agar media and the H and O stable isotope ratios ratios of Bacillus subtilis spores cultured on agar. The delta2H vs delta18O relationship of water in Petri dish agar was surprisingly constant during evaporation regardless of the ambient relative humidity, making it possible to calculate the approximate isotope ratios of the original water, even in significantly evaporated agar. The H stable isotope ratios of spores cultured on agar remained relatively unchanged as the agar dried, but the O ratio became significantly enriched.     

An 18-Year Model of Family and Peer Effects on Adolescent Drug Use and Delinquency

The interrelationship of family and peer experiences in predicting adolescent problem behaviors was examined in an 18-year longitudinal sample of adolescents (N = 198) from conventional and nonconventional families. Positive associations among early childhood predictors and adolescent problem behaviors were consistent with problem behavior theory. The most powerful predictors of teen drug use and delinquent behaviors were similar behaviors by peers. Peer behaviors, however, were in turn predicted by earlier family-related variables and the quality of peer relationships in childhood. This study provides supporting evidence that strong peer effects in adolescence reflect even earlier processes in childhood and highlight the importance of linkages from early childhood experiences in family and peer contexts to the development of problem behaviors in adolescence. Implications for prevention and intervention programs are discussed.