alkali metal, cadmium sulfide, hydroxyl radical, enzymatically, diffraction grating, neutron radiation, calcium fluoride, photochemical reaction, corona discharge, calcium sulphate, boron nitride, boron trifluoride, dipole moment, piezoelectric crystal, ultraviolet lamp, lacrimal gland, thermodynamically, macroscopically, covalent bond, silicic acid, oxidizing agent, electrostatically, bacterially, electromagnetically, carboxylic acid, valence electron, molecular sieve, colloidal suspension, hypochlorous acid, activated carbon, chemically, calcium hydroxide, spectroscopic analysis, barium sulfate, horseradish peroxidase, silver nitrate, radioactively, electromotive force, subarachnoid space, zinc chloride, aqueous solution, vitreous humor, methylene blue, ferric oxide, umbilical vein, aromatic hydrocarbon, strange quark, green alga, lithographically, sacrificial anode, catalytically, thermally, exothermic reaction, diethyl ether, bile acid, crystal lattice, silica gel, osmotic pressure