[Hu, Xiangen;Cai, Zhiqiang;Shubeck, Keith;Graesser, Arthur] Univ Memphis, Memphis, TN 38152 USA.^[Hu, Xiangen] Cent China Normal Univ, Wuhan, Hubei, Peoples R China.^[Pai, Kai-Chih;Kuo, Bor-Chen;Liao, Chen-Huei] Natl Taichung Univ Educ, Taichung, Taiwan.