The characteristics of vegetative cell growth and akinete formation in the cyanobacterium Dolichospermum planctonicum were examined using three different media (WC, CB, CT media), two methods for recovery akinetes, i.e. lysozyme method sedimentation-separation method, compared to evaluate which way was efficient. equilibrium density higher WC medium than those CB (p < 0.05), exhibiting ca. 1.23...

BACKGROUND Filamentous Zygnematophyceae are typical components of algal mats in the polar hydro-terrestrial environment. Under field conditions, they form senescent vegetative cells, designated as pre-akinetes, which are tolerant to desiccation and osmotic stress. KEY FINDINGS Pre-akinete formation and desiccation tolerance was investigated experimentally under monitored laboratory conditions...

The aim of this study is to investigate the population dynamics of harmful algal bloom by using the Joehnk’s model with some generalizations. The present mathematical model is a second-order nonlinear nonautonomous system based on delay differential equations. One variable is the biovolume of vegetative cells and the other one is the number of units of akinetes. The akinete is a thick-walled do...

The bloom-forming cyanobacteria, Cylindrospermopsis raciborskii, is a producer of the cytotoxic cylindrospermopsin (CYN). In this study, the growth, toxin yield, and expression of CYN biosynthesis genes of C. raciborskii were examined under varying phosphorus (P) concentrations. The results show the cell number at 0.00 and 0.01 mg·L-1 P was significantly lower than that at higher P concentratio...

Two transcriptional reporter shuttle vectors were constructed for the filamentous cyanobacterium Nostoc punctiforme using the green fluorescence protein (GFP) reporter. Both the ampicillin- and kanamycin-resistant versions of the plasmid allow promoters to be directionally cloned into a multiple cloning site preceding a promoterless gfp gene using an Escherichia coli host. The ability of the se...