Premium
KINETIC ANALYSIS OF INTERACTIVE EFFECTS OF CADMIUM AND NITRATE ON GROWTH OF THALASSIOSIRA FLUVIATIUS (BACILLARIOPHYCEAE) 1 , 2
Author(s) -
Li William K. W.
Publication year - 1978
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1978.tb02468.x
Subject(s) - biology , cadmium , nutrient , limiting , nitrate , growth rate , saturation (graph theory) , isochrysis galbana , cadmium nitrate , environmental chemistry , botany , zoology , ecology , chemistry , larva , geometry , mathematics , organic chemistry , combinatorics , engineering , mechanical engineering
The effect of cadmium on growth rates of Thalassiosira fluviatilis Hustedt and Isochrysis galbana Parke at non‐limiting nutrient concentrations is described by the lerusalimskii equation. At limiting nitrate concentrations, the effect of Cd on growth rate of T fluviatilis is described by analogy to the general equation of enzyme inhibition in which the reaction involves a single intermediate. When cells are stressed by Cd, not only is the maximum growth rate reduced, but the half‐saturation growth parameter is increased. The value of log (k 1 /k 2 ) can be used to describe the type and degree of interaction between a nutrient and an inhibitor , k, and k 2 ate the inhibitor concentrations resulting in 50% growth inhibition as nutrient concentration approaches zero and an infinitely large value respectively. Results show that for T fluviatilis, the degree of inhibition by Cd is more severe at low than at high NO 3 ‐levels but the difference in seventy diminishes at Cd concentration increases .