Humic substances are highly chemically reactive yet recalcitrant with respect to biodegradation according to the definition of International Humic Substances Society [7].
Composting and the formation of humic substances are highly studied but also highly variable and surprisingly poorly understood processes.
These toxic substances are highly chemically reactive and can react with cellular biomolecules including proteins, lipids, and DNA, resulting in varieties of oxidative lesions.
These substances are highly resistant to degradation, have lipophilic properties, and accumulate in animal and human fat tissues for many years (Porta et al. 2008).
Both substances are highly pure carbon particulates of similar size (i.e., they are nanosubstances, entities internationally recognized as being not less than 100 nm in one or more of the three dimensions).
Uncontrolled burning and dismantling/recycling of electronic and electric waste in developing countries results in contamination and formation of brominated and chlorinated dioxins and furans (Weber and Kuch 2003); these substances are highly toxic, thus causing increased concern both for the health of individuals and for the environment.
A comparison of the detection capacity of assays sampling different kinds of genetic damage revealed that various substances are highly effective in inducing mutations but do not produce chromosome breakage effects at all, or only at much higher concentrations than those required for mutation induction.
Drug workers say the substance is highly addictive and that withdrawal symptoms can be physically as severe as those from heroin, and psychologically as bad as those from crack.
And enriched uranium is a particularly sensitive topic and creation and distribution of the substance is highly controlled.
Though not necessary, strict uniqueness, which is always assigning a single label to a particular substance, is highly convenient and very desirable.
