IN autumn the grass-feeding larvæ of Tenthredopsis litterata Geoff. and T. nassata F. undergo an ecdysis prior to entering the soil at plant roots, where they remain as overwintering non-feeding ...
PENICILLIN has been obtained in the form of a highly purified barium salt by repeated fractional extraction from amyl acetate into water, chromato-graphic separation on an alumina column ...
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