Methodological Comparison of Chlorophyll and Carotenoids Contents of Plant Species Measured by DMSO and Acetone-extraction Methods Physiological Effects of H2O2 and Ca2+ on Cold stressed Banana Seedlings Physiological Effects of H2O2 and Ca2+ on Cold stressed Banana Seedlings Scavenging effect on active oxygen of metal chlorophylls from silkworm excrement