Comparative metabolism of 1,1-Bis-(p-chlorophenyl)-2-nitropropane (Prolan) in mouse,insects, and in a model ecosystem

¹⁴C-labeled Prolan or 1,1-bis-(p-chlorophenyl)-2-nitropropane was found to be some-what more biodegradable than DDT. This insecticide, although highly resistant to microsomal metabolism, was degraded by elimination to 1,1-bis-(p-chlorophenyl)-1-propene, and by reduction to 1,1-bis-(p-chlorophenyl)-2-aminopropane. The major degradative pathway, however, was by oxidation to 1,1-bis-(p-chlorophenyl)-2-propanone, to 1,1-bis-(p-chlorophenyl)-pyruvic acid, to bis-(p-chlorophenyl)-acetic acid, and ultimately to p,p′-dichlorobenzophenone. Therefore the ultimate degradative products of Prolan are identical to those produced from DDT.     

A new ornithological record,Pechora Pipit Anthus gustavi Swinhoe,1863,from Xinjiang

On 15 September,2010,a Pechora Pipit Anthus gustavi Swinhoe was found in the Hami prefecture(41°13’N and 93°29’E,1,143 m a.s.l.),Xinjiang,during the period of a comprehensive scientific survey in Lop Nur region.The bird,which was photographed,is a new avian record for Xinjiang.The pipit reproduces in northern Eurasia,mainly in wide meadows and low hills,and can be found in open forests and nearby residential areas in the process of on migration.The species is an insectivore and is a rare migrant or vagrant in Xinjiang.The geographical distribution,character,habitat,ecological habit and subspecies of the Pechora Pipit were discussed in this paper.     

Vacuum phenomenon in the metatarsophalangeal joint of a horse

Vacuum phenomenon was induced inadvertently during radiographic examination of a metatarsophalangeal joint of a lame horse. The phenomenon was recreated in a sound horse when a metacarpophalangeal joint was radiographed in a stress-flexed position. Distraction of apposing articular surfaces may induce the vacuum phenomenon, which could result in misdiagnosis of an osteochondral defect or fracture.