A n isoflavanoid derivative has been iso lated as a phytoalexin from intact plants and cell suspension cultures o f Ornithopus sativus after treatm ent w ith C u S 0 4, yeast elicitor, or a spore suspension o f Colletotrichum trifolii. B ased on its physical and sp ectroscop ic p roperties the substance w as identified as glabridin. A fter induction, the transient increase in the co n ­ ten t o...

other Rhizobium species. Most of these plasmids encoding for fixation and nodulation properties are non-self transmissible. Plasmid profiles were determined for 24 strains of R. trifolii. All the strains harboured at least three plasmids and as many as eight were present in some strains. Southern hybridization with cloned R. meliloti nifgenes was used to identify indigenous Nif plasmids. Each s...

The laboratory experiments tested the influence of selected pesticides on the symbiotic efficiency and nitrogenase activity of Rhizobium leguminosarumin bv. trifolii KGL, Sinorhizobiuni melilotii Bp and Badyrhizobium sp. Ornithopus B bacteria entering into symbiosis with clover, lucerne and serradella, respectively. The results obtained indicate that the pesticides used in the experiments (Funa...

AND LILLIAN K. SCHNEIDER..................................... 181 The Consequences of Mutation during the Growth of Biochemical Mutants of Escherichia coli. III. The Inhibition of Histidine-independent Bacteria by Histidineless I3acteria in Aerated Cultures. FRANCIS ,J. RYAN AND LILLIAN K. SCHUCHARDT ................................... 191 The Consequences of Mutation during the Growth of Bioch...

A new cucurbitane glucoside, 23-O-beta-D-glucopyranosyl-7-hydroxy-3-O-malonylcucurbita-5,24-dien-19-al, named momordicine V, has been isolated from Momordica charantia leaves, along with the previously reported compounds, momordicines I, II, IV and 3-O-malonylmomordicine I. The structure of the new compound was established on the basis of spectral analysis, as well as by its conversion to momor...

The major oligosaccharide from the core region of the lipopolysaccharide from R. trifolii ANU843 was isolated and its structure determined. It is a trisaccharide consisting of two galacturonic acid residues and one 3-deoxy-D-manno2octulosonic acid (KDO) residue. The two galacturonic acid residues are terminally linked alpha to the C-4 and C-7 atoms of KDO. This structure was determined through ...