Nephrotoxic lesions from 5-aminosalicylic Acid.

5-Aminosalicylic acid given to rats as a single intravenous injection led to necrosis of the proximal convoluted tubules and of the renal papilla. These two lesions developed at the same time and the cortical lesions did not appear to be a consequence of the renal papillary necrosis. Since the compound possesses the molecular structure both of a phenacetin derivative and of a salicylate these observations may be relevant to the problem of renal damage incident to abuse of analgesic compounds and suggest the possibility that in this syndrome cortical lesions may develop independently of renal papillary necrosis.

Comparative nephrotoxicity of aspirin and phenacetin derivatives.

Both aspirin and phenacetin derivatives were shown to be nephrotoxic when administered to rats as a single intravenous injection. Phenacetin derivatives tended to produce more severe renal damage and to be nephrotoxic in smaller doses than aspirin derivatives. With the exception of a single derivative, the renal lesions were confined to the proximal convoluted tubule, even after administration of compounds which under other conditions have induced renal papillary necrosis.

[Susceptibility Of Cockroaches (Blattella Germanica Linneaus) To Various Insecticides].

During the period from May to October 1969, the authors carried out a series of tests with the aim to ascertain the present status of susceptibility of adult cockraoches to various insecticides. The tests on the susceptibility of cockroaches to dieldrin, D.D.

[Insecticide resistance in bedbugs(Cimex lectularius) in Korea].

In the summer of 1969 from July through October, authors carried out a study of susceptibility in adult female bed bug(Cimex lectularius) in order to ascertain any development of resistance to insecticides in Korea. The test to DDT and Dieldrin was performed in laboratory by the continuous exposure of residues method, with standard impregnated paper used for adult mosqitoes. Some results so far obtained can be summarised as follows: 1.

Kidney lesions induced in rats by p-aminophenol.

Necrosis of the terminal third of the proximal convulated tubule develops in rats after a single intravenous injection of p-aminophenol hydrochloride. As the tubules regenerate a chronic inflammatory reaction occurs in the interstitial tissue, and this reaction extends beyond the original zone of injury. These findings are additional evidence that some aromatic compounds are selectively nephrotoxic and may be particularly relevant to the problem of renal damage associated with heavy and prolonged doses of analgesics.