It had been known that narcotics are more soluble in fats and oils than in water. With this in mind, yon Bibra and Hatless, 1 in 1847, carried on a series of experiments on rabbits. Half the animals were anesthetized, and the other half were used as controls. All the animals were killed and the fat content of the brains and livers was determined quantitatively by extraction with alcohol and eth...

The most negative effects caused by noise exposure related to the hearing system are well known and may produce professional or even permanent deafness. Since these effects have very important influence on worker’s health and well-being, it is necessary to evaluate the hearing loss caused by occupational exposure to noise in order to propose preventive solutions. A large number of compensation ...