Now showing items 11-20 of 25
The X-ray cataclysmic variable 1E0643.0 −1648
We have used a new simultaneous IR/optical high-speed photometer on the UK IR telescope to study the recently discovered X-ray cataclysmic variable 1E0643.0−1648 (refs 1, 2). The light curve of this object obtained by the ...
Eradication of cassava mosaic disease from Nigerian cassava clones by meristem-tip culture
Methods previously established for the propagation of cassava plants free from cassava mosaic disease have been applied to Nigerian clones. Meristem tips from diseased plants subjected to heat treatment for not less than ...
Standing on the Outside
Vegetation damage during an episode of selenium pollution
Necrotic lesions were observed on the leaves of trees and herbaceous species in the vicinity of a copper refinery. Analysis of leaf samples revealed the presence of excessive concentrations of selenium and copper. The ...
Effects of root-infecting fungi on structure and function of cereal roots
(Cambridge University Press, 1981)
Infrared and optical polarization of Markarian-421
Observations of the polarization of Mrk 421 in the V, J, and K bands are presented. The infrared radiation shows variable polarization with a range of at least 2-4%. The spectrum of the nonthermal source in the VJK regions ...