title: The effects of dieldrin, dimethoate and permethrin on Tetrahymena pyriformis.
abstract: The effects of three insecticides, dieldrin, dimethoate and permethrin, on the growth of a holotrichous ciliate, Tetrahymena pyriformis, were studied for 5 days. The ciliate was very sensitive to dieldrin and dimethoate. Both these insecticides produced approximately 81% and 84% inhibition of growth within two days. Dieldrin caused rounding of cells, while dimethoate induced cell lysis. Dimethoate also triggered a general mucocyst discharge. Of the three insecticides, permethrin was the least toxic and induced no morphological alterations.
authors.affiliation: Department of Zoology, Sri Venkateswara College, Dhaula Kuan, New Delhi-110 021, India.
authors.forename: S
authors.initials: S
authors.lastname: Kumar
authors.forename: R
authors.initials: R
authors.lastname: Lal
authors.forename: P
authors.initials: P
authors.lastname: Bhatnagar