For example, a non-destructive technique for measuring sulphation levels of frescos was developed in the 1980s.

Impossibility of "sulphation."

Another major problem is sulphation, caused by sulphurous compounds in the air -eg SO 2 produced from combustion, particularly in large cities.

This examination included an environmental analysis, measurement of sulphation, possible presence of organic residues from previous restorations and the level of cohesion of the arriccio.

If this is indeed the case, then the amount of sulphated glycoprotein produced by the host, its degree of sulphation, and the activities of the hydrolytic bacteria involved in releasing free sulphate from these polymers, would all influence sulphate reducing bacteria growth.

In therapeutic doses (up to 4 g a day) paracetamol undergoes glucuronidation and sulphation in the liver with only a small amount being metabolised by cytochromes to the toxic metabolite N -acetyl- p -benzoquinone imine, which is inactivated by hepatic glutathione.