A field experiment showed that numbers of Escherichia coli declined significantly when floating Lemna spp. plants were removed to create open water areas in a typical newly constructed surface flow treatment wetland in southern Ontario. It is suggested that E. coli declined immediately after Lemna removal because the Lemna was shading the water column from penetration by natural UV radiation, i...

This paper represents attempts to observe alterations in the pattern of chromatin protein phosphorylation in Lemna and barley (Hordeum vulgare).As judged by in vitro labeling the phosphorylation profile is substantially altered during germination. This may not be the result of specific tissue differentiation, however, because phosphorylation does not differ markedly between the embryonic root a...

This investigation was undertaken to study Pb uptake by small free floating aquatic plant Lemna minor from wastewater polluted by contaminated with heavy metals. Metal accumulation process was affected by various parameters such as different pH, temperature and concentration of Pb solution. Total chlorophyll contents in Lemna minor was adversely affected from increased with increasing Pb concen...

Toxic heavy metal pollution of water and soil is a major environmental concern for which conventional remediation approaches do not provide an appropriate solution. Phytoremediation, which involves removal of pollutants from water and soil through plants, is of low cost and environmentally friendly. In this study, the phytoremediation potential of Lemna minor for the uptake of Cr(VI) at the opt...

BACKGROUND Freshwater duckweed, comprising the smallest, fastest growing and simplest macrophytes has various applications in agriculture, phytoremediation and energy production. Lemna minor, the so-called common duckweed, is a model system of these aquatic plants for ecotoxicological bioassays, genetic transformation tools and industrial applications. Given the ecotoxic relevance and high pote...

Lemna paucicostata Hegelm is traditionally used as healthy feed for fish, broilers and as a source for vitamin A. In the present study, we report the isolation of an aromatic compound and a steroid glycoside from Lemna pauciscostata . The methanolic extract of dried and powdered Lemna paucicostata was fractionated using solid phase extraction (SPE). The compound was collected in a series of fra...

To assess the tolerance and effect of heavy metals pollution on the duckweed Lemna minor, the aquatic plants were exposed to different concentrations of copper (Cu), nickel (Ni), cadmium (Cd) and zinc (Zn) in a quarter Coïc and Lessaint solution at pH = 6.1 (± 0.1) and under a daily regime of 16 h light (101 μmol/m2.s1). Copper at 0.2 mg/L and nickel at 0.5 mg/L promoted the growth of Lemna fro...

Glutamate dehydrogenase (L-glutamate: NAD+ oxidoreductase (deaminating) EC 1.4.1.2) has been purified to homogeneity from Lemna minor and seeds of Pisum sativum. As established by polyacrylamide gel electrophoresis the Pisum-enzyme constitutes a multiple pattern of seven charge isoenzymes whereas the Lemna enzyme shows one single protein band. Molecular weights of 230 000 were calculated for bo...

A method is described for measuring the rate constants of both synthesis and degradation of nucleic acids in sterile growing cultures of Lemna minor which avoids the difficulties of environmental changes in isotope uptake and precursor pool size. In fast growing cultures the half-life of ribosomal RNA has been estimated to be between 5 and 8 days.This half-life has been shown to consist of two ...