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water plant cell agrobacteria microbiology sanitation of water hummer's method graphite graphene graphene oxide green chemistry microwave assisted organic reactions microwave synthesis air pollution particulate matter waste water treatment chemistry of bioleaching microorganisms used in bioleaching definition of bioleaching nanomaterials sol-gel process gas phase synthesis of nanomaterials 13 c-nmr proton-coupled and proton decoupled 13c spectra. nuclear magnetic spectra nucleophilic substitution reactions sn1 (substitution nucleophilic unimolecular) sn2 (substitution nucleophilic bimolecular) sni (substitution nucleophilic internal) .