Magnetic funnel: A magnetic funnel (Brand name: Magnetic Technologies L.L.C., Model No. MFL01, Dubai, U.A.E.) was used. Two cassettes with ceramic magnets are located inside the cylindrical part of the magnetic funnel. Length of each cassette is 75 mm, there are seven magnets installed inside of each cassette with intervals. North poles of magnets of one cassette are located opposite south poles of magnets of other cassette. Maximal magnetic induction along axis cylindrical part of the magnetic funnel is 57-60 mT (millitesla) between magnets in each pair and 4-6 mT in the intervals between the pairs of magnets.