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Twist-3 pion and kaon distribution amplitudes from the instanton vacuum with flavor SU(3) symmetry breaking
We investigate the twist-3 pion and kaon distribution amplitudes of the
pseudoscalar (phi^p_{pi,K}) and pseudotensor (phi^{sigma}_{pi,K}) types, based
on the effective chiral action from the instanton vacuum. Effects of flavor
SU(3) symmetry breaking are explicitly taken into account. The Gegenbauer
moments and the moments of the distribution amplitudes () are also
computed. Our results are summarized as follows: a^p_{2,pi} ~ 0.4, a^p_{1,K} ~
0.02 and a^p_{2,K} ~ 0.14, and a^{sigma}_{2,pi} ~ 0.02 and a^{sigma}_{1,K} ~
a^{sigma}_{2,K} ~ 0; ^p_{\pi} ~ ^p_K ~ 0.37 and ^p_K ~ 0, and
^{sigma}_{pi} ~ ^{sigma}_K ~ 0.20 and ^{sigma}_K ~ 0. We
compare our results with those from the QCD sum rules. We also discuss the
relevant Wilson coefficients which were analyzed recently in chiral
perturbation theory.Comment: 12 pages, 4 figures, accepted for publication in PR
Anti-oxidative activities of sorghum, foxtail millet and proso millet extracts
In this study, sorghum, foxtail millet and proso millet extracts were evaluated by various in vitro antioxidant assays, including 1,1-diphenyl-2-picryl-hydrazyl (DPPH) free radical scavenging activity, reducing power by Fe3+- Fe2+ transformation, and anti-lipid peroxidative activity by ferric thiocyanate. The sorghum extract contained high amount of phenolic compounds as well as a high level of antioxidant activity compared with foxtail millet and proso millet extracts. In addition, among the sorghum cultivar, me-susu (Sorghum dochna var. technicum, Snowden) extracts exhibited high levels of free radical scavenging activity, anti-oxidant capacity and anti-lipid peroxidative activity compared with - tocopherol. Taken together, these findings suggest that me-susu extracts can be considered good sources of natural anti-oxidants
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