” It is, however, an extremely rare occurrence since it is more than an evolutionary progression: It also implies a discontinuity in its development, a leap to an entirely different level of Being and, most important, a lessening of materiality. What could be heavier and more impenetrable than a rock, the densest of all forms? And yet some rocks undergo a change in their molecular structure, turn into crystals, and so become transparent to the light. Some carbons, under inconceivable heat and pressure, turn into diamonds, and some heavy minerals into other precious stones. Most crawling reptilians, the most earthbound of all creatures, have remained unchanged for millions of years. Some, however, grew feathers and wings and turned into birds, thus defying the force of gravity that had held them for so long. They didn’t become better at crawling or walking, but transcended crawling and walking entirely.
are mainly compounds of m.w. smaller than modern automatic kiln with external smoke 216. In different smoked meat products, their generation, the contents of BaP are about total mass may be from about 30 to 250 times 0.1 ng/g. larger, while that of the heavy PAH about 10 Some smoked foods may also be contami- times larger than that of BaP. If the specific nated with nitropolycyclic aromatic hydro- carcinogenicity of various heavy PAH con- carbons. In smoked sausages, 1-nitropyrene, tained in smoked foods is taken into consid- 2-nitronaphtalene, and 2-nitrofluorene were eration, the total carcinogenicity of all PAH found in concentrations of about 4.2, 8.4, is about 10 times higher than would result and 19.6 ng/g, respectively, while in roasted from the content of BaP alone (Scientific coffee beans the concentrations were 2.4, 4.0, Committee on Food 2002). Although many and 30.1 ng/g.
annaabi.ee 
