The effects of quartz and carborundum dusts on the activity of cytochrome oxidase of rat lung tissue were investigated over a period of 90 days after intratracheal administration (50 mg./ml. suspension).
The fibrogenic and carcinogenic properties of suspensions of freshly milled crocidolite, crocidolite plus quartz, chloroform extracted crocidolite and of extracted crocidolite plus quartz were investigated on the lungs of specially young rats.
Infectious drug resistance was encountered in 19% of 161 drug-resistant Escherichia coli from human sources. These E. coli transferred their resistance spectrum to a sensitive Salmonella indicator strain during conjugation.
The fibre compo it ion of the trunk of the vagus nerve in man was studied by histological sections at 2 levels: (a) at the jugular foramen of the skull between the jugular ganglion and the ganglion nodosum: and (b) the posterior vagus in the oesophagus at the level of the diaphragm.