Water: A Unique Solvent and Vital Component of Life
Water is a unique solvent by virtue of its extensive hydrogen-bonded character in bulk phase. Biological water has properties contributed by the properties of individual H2O molecules and by the collection of H2O molecules into a bulk phase with extensive intramolecular interactions. Therefore, on the basis of just our knowledge of statistical thermodynamics we would expect that the important properties of biological water will depend on the behavior of the collection of molecules or the entropic nature of water. However, biological systems are non-homogeneous, and non-bulk water plays a wide variety of physiological roles as well.