melting, 907 melting point (corrected/ uncorrected), 907 membrane, 907 membrane emf, 907 membrane in an ion-selective electrode , 908 membrane potential, 908 membrane sites in an ion-selective electrode , 908 memory effect in atmospheric chemistry , 908 mer- in inorganic nomenclature , 909 mercaptals [obsolete] , 909 mercaptans [obsolete] , 909 mercaptides [obsolete] , 909 mercaptoles [obsolete] , 909 mercury flow system in spectrochemical analysis , 910 mercury–xenon lamp, 910 mero, 910 merry-go-round reactor (turntable reactor), 910 meso , 911 meso structures in polymers , 911 meso -compound, 911 mesogen, 912 mesogenic group, 912 mesogenic monomer, 912 mesogenic pitch, 913 mesoionic compounds, 913 mesolytic cleavage, 913 mesomeric effect, 913 mesomerism, 914 mesomorphic phase, 914 mesomorphic state, 914 mesomorphic transition, 914 mesopause in atmospheric chemistry , 915 mesophase, 915 mesophase pitch, 915mesophase pitch-based carbon fibres, 915 mesophiles, 916 mesopore in catalysis , 916 mesoscale, 916 mesosphere, 916 messenger RNA (mRNA), 916 metabolic half-life (metabolic half- time), 917 metabolism, 917 metabolite, 917 metal to ligand charge transfer (MLCT) transition, 917 metal to metal charge transfer (MMCT) transition, 918 metallacycloalkanes, 918 metallocenes, 918 metalloenzyme, 919 metallurgical coke, 919 metal–carbene complexes, 919 metal–carbyne complexes, 919 metal–insulator transition, 920 metamagnetic transition, 920 metastability of a phase , 920 metastable, 921 metastable ion in mass spectrometry, 921 metastable state in nuclear chemistry , 921 metastable state in spectrochemistry , 921 metathesis, 922 methanogens, 922 method of isotopic perturbation, 922 methylene, 922 methylidyne, 923 methylotrophic microorganisms, 923 metre, 923 micellar catalysis, 923 micellar mass, 923 micellar solubilization, 924 micelle, 924 micelle charge, 924