Underwater television as a fishery-independent method for stock assessment of Norway lobster (Nephrops norvegicus) in the central Adriatic Sea (Italy)

An affinity ligand-matrix conjugate comprises the matrix and, conjugated thereto by the group Z, a ligand having general formula (I) wherein on X is N and the other X is N, CCL or CCn; A1 and A2 are each independently O, S or N-R1 and R1 is H, C1-6alkyl, C1-6 hydroxyalkyl, benzyl or beta-phenylethyl; B1 and B2 are each independently an optionally substituted hydrocarbon lingkage containing from 1 to 10 carbon atoms; D1 is H or a primary amino, secondary amino, tertiary amino, quaternary ammonium, imidazole, guanidino or amidino group; and D2 is a secondary amino, tertiary amino, quaternary ammonium, imadazole, guanidino or amidino group; of B2-D2 is -CHCOOH-(CH2)3-4-NH2; AND p is 0 or 1. Such conjugates are useful for the separation, isolation, purification, characterisation, identification or quantification of an endotoxin.