concentrations of elements (as, co, cu, ni, mo, pb, v, cd, cr and zn) are studied in the surface sediments of bakhtegan lake, northwest of nyriz city, iran, to assess metal contamination. the average abundance order of trace elements content in bakhtegan lake sediments is cr>ni> v> zn> cu> co> as> pb> mo>cd. the comparison of trace elements concentration in bakhtegan lake sediments with toxicol...

NOEC and LOEC (no and lowest observed effect concentrations, respectively) are toxicological concepts derived from analysis of variance (ANOVA), a not very sensitive method that produces ambiguous results and does not provide confidence intervals (CI) of its estimates. For a long time, despite the abundant criticism that such concepts have raised, the field of the ecotoxicology is reticent to a...

Coleman WM III (1992a) The volatile and semivolatile components of supercritical Suid and methylene chloride extracts of selected tobaccos. Journal of Essential Oil Research 4: 113. Coleman WM III (1992b) Automated purge-and-trapgas chromatography analysis of headspace volatiles from natural products. Journal of Chromatographic Science 30: 159. Coleman WM III (1996) A chromatographic study of t...

I address and explain the increased risk of adverse effects from nutrients by using the paradigm of hormesis, the biological and toxicological concept that small quantities have opposite effects from large quantities. To provide necessary background, I categorize, depict, discuss, and contrast hormetic and other dose-response relations. I review some of the different hormetic mechanisms that ot...

AIMS To perform a toxicological analysis of deaths involving methadone and to determine the fatal concentration of methadone in such deaths. METHODS Deaths in which methadone was mentioned in the cause of death were identified. Deaths were divided into those associated with methadone only and deaths in which the cause of death was a combination of methadone and other drugs. Toxicological find...