We explore the circumstellar effects on the Li and Ca abundances determination in a complete sample of massive Galactic AGB stars. The Li abundance is an indicator of the hot bottom burning (HBB) activation, while the total Ca abundance could be affected by overproduction of the short-lived radionuclide 41Ca by the s-process. Li abundances were previously studied with hydrostatic models, while Ca abundances are determined here for the first time. The pseudo-dynamical abundances of Li and Ca are very similar to the hydrostatic ones, indicating that circumstellar effects are almost negligible. The new Li abundances confirm the (super-)Li-rich character of the sample Li-detected stars, supporting the HBB activation in massive Galactic AGB stars. Most sample stars display nearly solar Ca abundances that are consistent with predictions from the s-process nucleosynthesis models. A minority of the sample stars show a significant Ca depletion. Possible reasons for their (unexpected) low Ca content are given.

Part I of this series of articles about stress among emergency medical technicians (EMTs) reviewed the potential sources of EMT stress. This article investigates the other side of the stress equation and provides a critical review of the empirical literature on the effects of stressors on EMTs. It is subdivided into sections corresponding to trends in the research, including: 1) predictors of higher stress levels; 2) differences in stress responses among EMTs, other health professionals, and firefighters; and 3) various physiologic, psychologic, and job performance responses. It identifies some of the methodologic flaws found in the EMT-stress literature that are noted in Part I, and provides further direction for future research. To maintain homogeneity, this review is limited to those articles published in scholarly journals. Studies investigating constructs such as job dissatisfaction and burnout were not included unless the study also included a measure of stress or stressors.