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active catalyst Agelaea trinervis arteria nasalis externa Clover's apparatus computerized ultrosonic scan system definitive nucleus downfaulted basin eirp (eqvivalent isotropic radiated power) electromotive force emf liquor natrii chloridi isotonicus locked-seam man-made dust middleatmospheric radiation budget phenol derivatives power off switch racemic compound reposers research on economic factor Staritskogo Gora vayus