Peptide unit definition

FlSi 11.41 The definition of the torsional angles ij/ and ip between two peptide units. 

Soil polysaccharide also contains phosphorus and sulphur. The latter ranges from one S atom per 40-250 hexose units and it may be in the form of ester sulphate groupswhereas the phosphorus is usually of the order of 1%. It is considered that neither the sulphur nor the phosphorus form would contribute in any special way nutritionally. In fact they may be more closely associated with the peptide which appears to be covalently linked to the polysaccharide and it becomes a matter of definition as to what is encompassed by the term polysaccharide. 

---