Transfer RNA and Aminoacyl Transfer RNA in Developing Rats

Abstract

The total transfer RNA (tRNA) level in the liver, kidney, skeletal muscle and heart muscle of developing rats was determined by purification using (³H)tRNA as an internal standard. Liver and kidney contained almost twice as much tRNA per gram tissue as heart and skeletal muscle. There were no apparent differences between the sexes. The aminoacylation capacities of six tRNA species (alanyl, aspartyl, leucyl, methionyl, phenylalanyl, and tryptophanyl) from rat liver were not different during three developmental stages (suckling, weanling and young adult), and there were also no differences noted between males and females. The in vivo percent aminoacylation of four tRNAs (aspartyl, leucyl, methionyl, and phenylalanyl) was lower during the newborn and suckling periods than in weanling and young adult rat livers. The tRNA of young adults was almost completely aminoacylated in vivo with the exception of alanyl-tRNA.

From Qatar to Xinjiang: Security in China's Belt and Road Initiative

“…Such an approach, from China's perspective, could effectively "respond to the challenges brought by the contiguous security environment." 49 Since the Qatar crisis of June 2017, the continuous standoff has become a security test to the BRI and Xinjiang development plan. The Qatar crisis, in China's view, has reconfirmed the importance of regional security in Central Asia and the Middle East in relation to Xinjiang's stability.…”