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Electron Paramagnetic Resonance (EPR), optical and infrared (IR) spectral studies have been performed on the pure and Cu-adsorbed exoskeletons of marine environment. The EPR spectrum of exoskeletons at room temperature exhibits a sharp signal at g~1.9970. The possible redox mechanisms have been noticed on heating these exoskeletons in which the low spin Mn 3+ reduces to Mn 2+...
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