PubMed Health⌕ Search

Biomedical subjects

M Tracy

Publications and source records attributed to M Tracy.

38 records · Page 3Linked to original sources

The effects of licensing and inspection enforcement to reduce tobacco sales to minors in Greater Philadelphia, 1994-1998.

This study examined the changes in tobacco sales to minors after active enforcement of merchant compliance to the Synar regulation and the city of Philadelphia Youth Access to Tobacco Ordinance 732. Data for the present study were obtained through Tobacco-free Education and Action Coalition for Health (TEACH) Program in a 5-year, follow-up retail compliance check survey of 1649 stores in 14 cluster areas of Philadelphia, PA. Trend analysis was conducted ofthe sales of tobacco to minors by type of retail outlet, gender, and age of the buyer, and gender, age, and race of the store clerk, and whether restriction policy signs were posted. Analysis indicates that there was a reduction in tobacco sales to minors after implementation of enforcement; sales dropped from 85% in 1994 to 43% in 1998. There were less sales to minors when signs were posted. There were differences in sales if the buyer was asked his or her age and whether the minor was asked to show identification. In addition, the age of the buyer and the brand of cigarettes were associated with sales. Future research should focus on both commercial and social availability and provision of tobacco to minors.

Adolescent↗

Comparative redox activities of anthracyclines by microsomes from P388 cells and rat liver.

In comparative tests of the capabilities of various analogs of doxorubicin and daunorubicin to augment oxygen consumption in microsome preparations from P388 mouse leukemia cells and from rat liver cells, we found statistically significant positive correlations between the Km values for microsomes from the two sources for parent compounds and analogs containing morpholinyl, cyanomorpholinyl- or imino-substitutions. Km values ranged from 0.015 to 1.3 mM, or about 90-fold for all analogs tested. Thus, rat liver microsomes are predictive for this characteristic in P388 microsomes. Examinations of the relationships between Km values from either source and ED50 values for cytotoxicity of the compounds against the P-388 cells also showed statistically significant positive correlations. However, the ED50 values encompassed a range from 0.00020 to 0.22 microM, or about 1000-fold. Therefore, additional mechanism(s) of action besides toxic oxygen radical formation must explain the extremely high cytotoxicity of the cyanomorpholinyl anthracyclines compared with their parent drugs.

Animals↗