Word: bacterias
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Gourmet's Delight. The reason for all the trouble is that most syndets are made of petroleum derivatives that are all but indestructible. Instead of breaking down in the soil and becoming food for bacteria as does soap - a nonsynthetic detergent made of animal and vegetable fats - the syndet remains active long after it goes down the drain, bubbling on and on through rivers and lakes and often seeping through the earth from septic tanks to well water (where its foamy presence may be a valuable warning that sewage is seeping in too). European waterways also foam with detergent...
...Test for Bacteria...
Doty pointed out that similar experimental procedures can be used to determine whether the base sequence in different strains of bacteria is similar. "If a large amount of hybridization occurs between two different strains," he said, "there is similarity in their DNA base sequences...
...determine the extent of hybridization, the DNA strand of one strain of bacteria is made heavier by introducing heavy nitrogen. If this chain "mates" with a chain of normal weight to form a hybrid, the weight of the resulting DNA will lie midway between the normal and heavy...
Chloromycetin. which is Parke. Davis' trade name for the potent antibiotic chloramphenicol. got FDA approval in 1949. It attacked many bacteria against which penicillin was useless, notably the typhoid bacillus; equally important, it was the first effective drug against psittacosis (caused by an unusually large virus) and against such diseases as typhus, scrub typhus and spotted fever (caused by related microbes called rickettsiae ). Not until 1952, when hundreds of thousands of patients had had the drug-often for viral respiratory infections against which neither it nor any other antibiotic is effective-did evidence arise that it had caused...