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Improving population health requires understanding and changing societal structures and functions, but countervailing forces sometimes undermine those changes, thus reflecting the adaptive complexity inherent in public health systems. The purpose of this paper is to propose systems thinking as a conceptual rubric for the practice of team science in public health, and transdisciplinary, translational research as a catalyst for promoting the functional efficiency of science. The paper lays a foundation for the conceptual understanding of systems thinking and transdisciplinary research, and will provide illustrative examples within and beyond public health. A set of recommendations for a systems-centric approach to translational science will be presented.

Disparities in smoking as a function of ethnicity exist, but part of that disparity appears to be mediated by education level. Smoking prevalence differences by ethnicity disappear or decrease substantially when controlling for education level. Nonetheless, ethnicity remains an important consideration when striving to understand the mechanisms associated with smoking, as well as in the development of smoking prevention and treatment programs. In this paper, the complex interrelationships among ethnicity, social class, and smoking are discussed in brief, and a framework for developing a systematic means of addressing social disparities in tobacco use is described.

This study examined the reliability of a test strip for assessing urinary nicotine and its metabolites. Urine samples from smokers were tested by two independent raters using the NicCheck I test strips. Each rater compared the test strip color to a five-color chart. Correlations between the rater's codings and between the coding and other measures of nicotine consumption were examined. Significant correlations were found between the two independent ratings of the test strip color and between the codings and other measures of nicotine consumption. This preliminary evaluation suggests that NicCheck I is sensitive to differences in nicotine consumption.