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Determination of enrichment factor To evaluate the magnitude of contaminants in the soils, EF were computed for each location relative to the abundances of species in source materials to the control/background value and the following equation as proposed by Simex and Helz (1981) ; Atgrin et al.
The heavy metal contamination levels were compared to the background level in a close area (see Bl in Figure 1), using the enrichment factor (EF), (ALOUPI; ANGELIDIS, 2001; SELVARAJ et al.
The surface enrichment factor (SEF) in polyester was determined using Eq.
The enrichment factor equals the odds ratio of expected and actually observed differentially transcribed genes per GO category.
This procedure will result in an enrichment factor of approximately 5x (32); and c) direct centrifugation to the electron microscopic grid with the Beckman Airfuge (Beckman, Palo Alto, CA) EM-90 rotor or A-100 rotor, a procedure that increases sensitivity up to 1,000 fold (40-42).
The novel platform achieves an enrichment factor of up to 5,000 for biologically active molecules, and was validated both in silico and in vitro.
In Khartoum the element of the low enrichment factor have miner contamination from industrial environment and have their origin largely from soil dust.
Given that the concentration of these cells or molecules can be very low compared to other commonly present cell types or molecules, one needs enrichment factors of 1 to 10,000 or 1 to million.