ABSTRACT
An automated routine method was developed for the determination of trace metals using a flow injection system into a direct current plasma spectrometer. The characteristic emission in the 'Spectra- Metrics' three-electrode jet is channelled through an echelle grating to the detector of the instrument. The emission signal is continuously recorded, and, after digitalization, calculated and recorded by a Touchstone software package and interface card. The software has facilities for recording peaks, generating calibration curves, calculating and printing results, enhancing line sensitivities, monitoring signal response and for filter noise, recalibration, background correction, status monitoring and general diagnostics. Up to 70 elements can be determined both in aqueous and non-aqueous media.
ABSTRACT
In plant cell suspension cultures, the fastest growing cell type will eventually dominate the culture. This selection process is often proposed as the mechanism by which cultures become habituated to stressful conditions. Equations which model the selection hypothesis predict a sinusoidal transition from sensitive to tolerant cells. Culture growth during the habituation process as predicted by this model closely matches the habituation of tobacco cells to NaCl as described by Nabors, Daniels, Nadolny, and Brown (1975). The equations can also be used to estimate a theoretical mutation rate from experimental results.
