article 8 beta glucan Glucans 6 beta-Glucans 6 biosynthesis 6 glucan 6 Bacterial Proteins 4 Glycopeptides 4 Kinetics 4 Membrane Proteins 4 Microscopy, Electron 4 Molecular Structure 4 Molecular Weight 4 Rhizobium 4 Rhizobium radiobacter 4 Soybeans 4 Species Specificity 4 Symbiosis 4 Uridine Diphosphate Glucose 4 bacterial protein 4 chemical structure 4 chemistry 4 classification 4 comparative study 4 cyclic beta(1 2)glucan 4 cyclic beta(1-2)glucan 4 electron microscopy 4 glycopeptide 4 isolation and purification 4 kinetics 4