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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
(a) LOD platform with four rectangular chambers. The channel width is 4 mm, the channel length is 35 mm, and the pitch of the scale bars is 1 mm. (b) The LOD platform in the centrifuge (Eppendorf® Centrifuge MiniSpin G). (c) The photo imaging system: a camera with macro lens.