Lysyl tRNAs of lupinus luteus seeds

Lysine accepting transfer RNA of lupin seeds and lupin embryo axes can be fractionated into at least 5 species by reversed-phase chromatography (RPC-5). One main and two minor isoacceptors were observed in wheat and barley embryos. Changes in isoaccepting species of tRNA^1ys were followed in cotyledons of germinating lupin seedlings. Ribosome binding studies revealed that one of the main lupin tRNA^1ys species recognizes the AAG codon, the second AAA and the third one AAA and AAG.     

The Stratiotes aloides L. stand as a habitat in oxbow lake Bużysko

The impact of Stratiotes aloides L. (water soldier) on the accumulation and concentration of nitrogen and phosphorus, seston concentrations and provision a habitat for planktonic crustaceans was studied in a Polish oxbow lake during 2002–2004. The Stratiotes stand and the open water differed in the concentrations of mineral nitrogen and chlorophyll a. Stratiotes accumulated significantly more nitrogen in spring. The lower TN:TP ratio, concentrations of mineral nitrogen and chlorophyll a in stands of the water soldier may suggest nitrogen limitation in the littoral of the oxbow lake. The decrease of phytoplankton biomass in the Stratiotes stands may also result from shading and/or allelopathy. The plants did not reduce seston concentrations in the littoral but did affect the abundance and diversity of planktonic and bentho-planktonic crustaceans and probably provided a daytime refuge for Ceriodaphnia and older stages of Cyclopoida but not for Daphnia.