Prebiotic homochirality. The origin of homochirality on on the prebiotic earth is unclear.  We study how differnces in chemical reactivity betweeen enantiomers are affected by H₂¹⁷O and pH. We use TD-¹HNMR to measure proton exchange parameters between amino acids and solution.  We analyze the organization and interaction between two 3s-spinomers -¹⁴NH₂ and H₂¹⁷O (Colaborators: Romulus I. Scorei and Vily M. Cimpoiasu, Univ. Craiova, Romania)