TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: The amino acid residues comprise positively charged amino acid residue. The hydrophobic moiety residue is linked to amino acid residues through a peptide bond. The hydrophobic moiety residue is linked to each of the amino acid residues through a peptide bond. The hydrophobic moiety has carboxylic group at one end of and an amine group at the other end. The amino acid residues comprise 2-50 amino acid residues. Preferred Composition: The positively charged amino acid residue is chosen from histidine residue, lysine residue, ornithine residue and arginine residue. The polymer comprises 2-50 hydrophobic moiety residues. The hydrophobic moiety residue comprises one fatty acid residue. The hydrophobic moiety is omega -amino-fatty acid residue. The hydrophobic moiety is chosen from 4-amino-butyric acid, 8-amino-caprylic acid and 12-amino-lauric acid. The amino acid residues substantially consists of positively charged amino acid residues, where the positively charged amino acid residues are chosen from lysine residues, histidine residues, ornithine residues, arginine residues and their combinations, preferably lysine residues. The polymer is having the formula X-W0-(A1-Z1-D1)-W1-(A2-Z2-D2)-W2-(An-Zn-Dn)-Wn-Y (I) and formula (II).n=2-50;A1,A2-An=amino acid residue;D1,D2-Dn=hydrophobic moiety residue or absent;Z1,Z2-Zn, W0,W1,W2-Wn=linking moiety linking amino acid residue and hydrophobic moiety residue, hydrophobic moiety residue or absent;X,Y=H, amine, amino acid residue, hydrophobic moiety residue, having formula (I) or absent;W0=linking moiety linking one of the A1, Z1 and D1 to U, or absent;Wn=linking moiety linking one of the An, Zn and Dn to V, or absent;U=first functional group, amino acid residue having the first functional group, hydrophobic moiety residue having the first functional group and linking moiety having the first functional group or absent;V=functional group, amino acid residue having the second functional group, and linking moiety having the second functional group or absent;andWc=cyclizing moiety.The hydrophobic moiety comprises hydrocarbon chain or fatty acid residue, and the amino acid residue is lysine residue. The method further involves collecting the microorganisms following the binding. The binding is effected either in vitro or ex-vivo condition, while maintaining viability of the microorganisms. The contacting is effected under stationary incubation conditions and/or under continuous flow conditions. The method further (i) involves subsequent to the contacting, releasing the microorganisms from the matrix, and (ii) identifying, isolating the microorganisms from the matrix. The matrix is suitable for repeated use. The polymer is covalently attached to the matrix through a C-terminus of the polymer. The detection and identification of microorganisms are quantitative. The identification is effected by a technique chosen from visual identification, DNA amplification PCR, morphological identification, biochemical identification, microbiological identification and immunological identification.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: The polymer is having the formula (III). The matrix is chosen from polymeric matrix, glass matrix, metal matrix, ceramic matrix, inorganic matrix, preferably flat surface, fiber, tube, bead, sphere, mesh, net, web, grid, lattice, plexus, screen, filter and their combinations. Preferred Definitions:    X=hydrophobic moiety residue, preferably dodecanoic acid;    Y=hydrophobic moiety residue, preferably amine;    W0,W1,W2-Wn,Z1,Z2-Zn=peptide bond;    Wc=peptide bond;    D1,D2-Dn= omega -amino-fatty acid residue, preferably 12-amino-lauric acid;and    n=5-7.