Sessile Growth Research Articles

Inability to Transfer Antibiotic Resistance in Escherichia coli on Meat Surfaces

ABSTRACTThe surfaces of beef and chicken samples were inoculated with a mixture of a donor (resistant to tetracycline, streptomycin, chloramphenicol, ampicillin, neomycin and sulphonamide), and a recipient strain of Eschetichia coli. Meats were maintained at 20°C and 4°C and sampled daily. Transfer of antibiotic resistance could not be demonstrated at either temperature. The recipient strain survived without significant growth at 4°C, but failure to transfer antibiotic resistance at 20°C was considered to be due to the sessile growth of the organisms enclosed in a dense glycocalyx, precluding close contact between the organisms.

Polyps of the rectum

A DISCUSSION of this subject seems important for three primary reasons : The incidence of the condition is higher than generalIy supposed; the marked tendency for these tumors to undergo malignant degeneration is not suff~cientIy appreciated, and the majority are amenabIe to offIce measures of treatment. A polyp can be defined as any peduncuIated or sessile growth projecting into the Iumen of the bowe1, either the resuIt of hypertrophy or hyperplasia of the mucous membrane, or else as a benign true tumor. These growths in genera1 may be classified as foIIows: of the different investigators having coined a word which they fee1 best describes the condition. The congenita1 type includes those cases usuaIIy appearing in adoIescent or early adult life in which a strong famiIia1 trait is evident, and which gives no history of previous inflammatory or uIcerative disease. The acquired type of muItipIe polyposis designates those cases which foIIow extensive inflammatory disease such as uIcerative coIitis, baciIIary dysentery, amebiasis and tuberculosis of the coIon.