水為生物的首選溶劑水是威力強大的小分子WeakChemicalBonds“Themorecomplexthesystem,theweakeraretheforcesthatgovernitsbehavior”-J.R.PlattTheFourWeakInteractionsThePolarNatureofWater1.HydrogenBondsCommonHydrogenBondsHydrogenbondinginice重要生物分子間氫鍵HydrogenBondStrengthisHighlyDirectional2.IonicInteractionsSolventPropertiesofH2ODipole-DipoleSaltsDissolveinAqueous“CagesofHydration”氧既是非極性，又如何支持生命？3.HydrophobicInteractions水的退出有利酵素與受質作用4.vanderWaalsInteractions