Figure 1From: Ultrafine particles cause cytoskeletal dysfunctions in macrophages: role of intracellular calciumMagnetic twisting device to measure relaxation and twisting (10 sec) of aligned ferromagnetic microparticles ingested by macrophages and detection by an array of magnetic fluxgate sensors (Förster devices, Förster GmbH, Reutlingen, Germany).Back to article page