When an external magnetic field is applied to a material, these current loops tend to align in such a way as to oppose the applied field. This causes all materials to be repelled by a permanent magnet; however, the resulting force is usually too weak to be noticeable.
Sources of E. coli. E. coli O157:H7 is most commonly found in cows, although chickens, deer, sheep, and pigs have also been known to carry it. Meat becomes contaminated during slaughter, when infected animal intestines or feces come in contact with the carcass.
E. coli, or Escherichia coli, is a type of bacterium that is naturally present in the intestines of humans and animals where it does not usually cause any problems. However, there are certain types (or strains) of Escherichia coli that can cause poisoning.Escherichia coli O157:H7 (or E. coli O157:H7) is one such strain, and it has been responsible for several E. coli outbreaks in the US, Canada, Spain, France, Germany, Japan and the UK since 1982.owever, there are certain types (or strains) of Escherichia coli that can cause poisoning. Escherichia coli O157:H7 (or E. coli O157:H7) is one such strain, and it has been responsible for several E. coli outbreaks in the US, Canada, Spain, France, Germany, Japan and the UK since 1982.