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.
Escherichia coli (E. coli) is a type of bacteria common in human and animal intestines, and forms part of the normal gut flora (the bacteria that exist in the bowel). There are a number of different types of E. coli and while the majority are harmless some can cause serious food poisoning and serious infection.or example, E. coli bacteria are a common cause of cystitis, an infection of the bladder that occurs when there is a spread of the bacteria from the gut to the urinary system. Women are more susceptible to urinary tract infection by E. coli because of the close proximity of the urethra and the anus.