Fig. 1From: Black glucose-releasing silicon elastomer rings for fed-batch operation allow measurement of the oxygen transfer rate from the top and optical signals from the bottom for each well of a microtiter platePictures of the punching tool applied to fabricate the polymer rings. (A) Frame with a manual lever. (B) View of the arrangement with frame, punch tool and silicone plate on a plastic plate. (C) Zoom side view of the punch tool. (D) Axial zoom view of the punch toolBack to article page