Methyldeficient mammalian 4s RNA: evidence for L-ethionine-induced inhibition of N6-dimethyladenosine synthesis in rat liver tRNA.

The nucleotide composition of 4s RNA from livers of rats fed with a diet containing 0.3% D-ethionine was found to be identical with that from untreated animals. In contrast, one single modified nucleotide was absent in 4s RNA from livers of rats fed with a 0.

2'-O-methyl ribothymidine: a component of rabbit liver lysine transfer RNA.

One of the lysine transfer RNAs of rabbit liver is shown to contain 2'-O-methyl ribothymidine in place of ribothymidine. This represents the first demonstration of the presence of 2'-O-methyl ribothymidine in a nucleic acid.

Determination of vanadium and molybdenum by atomic-absorption spectrophotometry.

A method is described for the determination by atomic-absorption spectrophotometry of vanadium and molybdenum, up to the milligram level, in samples of yellow cake, uranium-bearing minerals and geochemical standards. After attack with acids these two elements are separated from each other and from matrix elements by means of anion-exchange in 6M hydrochloric acid on the strongly basic anion-exchange resin Dowex 1, X8 (chloride form). Vanadium is unadsorbed and passes into the effluent while molybdenum is adsorbed on the resin.