The vapour-phase thermal cracking (i.e. non-catalytic) of a range of coal-derived Buy Ugg Boots Uk Online
materials and pure compounds using laboratory scale reactors is described. Up to 27% benzene, toluene and xylenes (BTX) and 24% ethylene were obtained by cracking hydrogenated coal extract, compared with less than 4% of each from unhydrogenated extract, anthracene oil and coal, confirming the importance of naphthenes (cyclic aliphatics) as BTX and ethylene precursors. Experiments with pure compounds showed that product yields could be predicted closely from the cracking pattern of the components and the composition of the mixtures.
Of 600 of the scientific visitors to a medical congress held in Teheran in 1968, 28% had diarrhœa. The syndrome was similar to the travellers' diarrhœa, or "turista", affecting U.S. visitors to Mexico. Only 8% of the 163 travellers from tropical countries (where diarrhœa is considered to be common) became ill, whereas 41% of those from countries with more temperate climates had diarrhœa. Only 1 out of 48 Buy Fake Uggs Uk
Iranians was affected. These findings suggest that immunity plays an important part in travellers' diarrhœa, and provide some support for the idea that the syndrome is caused by a living agent of disease.