hold-back carrier, 679 hold-up volume in chromatography, 680 hold-up volume (time), , in column chromatography , 680hole burning, 680 hole transfer, 681 holoenzyme, 681 Holtsmark broadening [obsolete] of a spectral line , 681 homo, 681 homoaromatic, 681 homochain polymer, 682 homochiral, 682 homoconjugation, 682 homocyclic compounds, 682 homodesmotic reaction, 683 homodetic cyclic peptide, 683 homogeneity in analytical chemistry, 683 homogeneous nucleation, 684 homogeneous polymer blend, 684 homoleptic, 684 homologous polymer blend, 684 homolysis (homolytic), 685 homolytic dissociative adsorption, 685 homomorphic, 685 homopolymer, 685 homopolymerization, 686 homopolysaccharide (homoglycan), 686 homotopic, 686 horizontal elution (horizontal development) in planar chromatography , 686 host, 687 host-vector system, 687 hot atom, 687 hot cell, 687 hot ground state reaction, 687 hot quartz lamp [obsolete] , 688 hot state reaction, 688 hour, 688 Hückel (4 n + 2) rule, 688 Hückel molecular orbital (HMO) theory, 689