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arsenite pesticide C-H-O ratio colourimetric purity crossbeding dynamic system respose Gymnura icandophila aeruginosa korb nebulan Nicolaitan nummular sputum o-phenyl-phenol one-and-one-half order myrtaless para-dimethylamino-benzalrhodanine pussy-willow rat trap cheese two-fluid description videodisc vortex separation yadavs