To assess the tolerance and phytoaccumulation ability of the duckweed Lemna gibba L. to copper (Cu) and nickel (Ni), the aquatic plants were exposed to different concentrations of Cu and Ni (0.1 – 2.0 mg/L) in quarter Coïc and Lesaint solution at pH = 6.0 (± 0.1) and under a daily regime of 12 h light. Copper and nickel were tolerated by L. gibba at concentrations ≤ 0.3 mg/L and ≤ 0.5 mg/L, res...

In a search for an analogue of AAL-toxin with high phytotoxicity and low mammalian toxicity, aminopentols [(AP1), hexacetyl AP1 and N-acetyl AP1], and nine analogues (1-9), were tested for toxicity to duckweed (Lemna pausicostata), susceptible tomato (asc/asc) leaf discs, black nightshade leaf discs and mammalian cell lines, including dog kidney (MDCK), rat liver hepatoma (H4TG) and mouse fibro...

OBJECTIVES A bioassay with arsenic-stressed duckweed (Lemna gibba L.) was developed to study potentially regulative effects of homeopathic preparations. We compared potentized substances (nine different potency levels between 17 x and 33 x ) with two controls (unsuccussed and succussed water) regarding their influence on number- and area-related growth rate and color of fronds (leaves). Screeni...

Cogongrass is a troublesome, invasive weedy species with reported allelopathic properties. The phytotoxicity of different constituents isolated from roots and aerial parts of this species was evaluated on garden lettuce and creeping bentgrass. No significant phytotoxic activity was detected in the methylene chloride, methanol, or water extracts when tested at 1.0 mg ml. However, the total essen...

duckweeds are of special interest, as they are naturally growing weeds that have the capacity to tolerate and remove toxic pollutants, including heavy metals from the environment. studies have revealed that duckweed (lemna minor) can tolerate and remove heavy metals from aqueous solutions. in the present study, the efficiency of l. minor in the removal of ni and cr individually from aqueous sol...

The biotemplating technique is an environmental-protective high-efficiency new technology by which the resulting TiO2 may simultaneously attain the duplication of structure and self-doping elements from biotemplate materials, which is highly desirable for photocatalytic applications. In this paper, aquatic plant leaves—including reed, water hyacinth, and duckweed—were used as both templates and...

Signal Crayfish (Pacifastacus leniusculus) are thought to be a species of commercial production potential, however there are a number of culture techniques that need to be better refined before commercial production is viable in Canada. This project sought to establish culture techniques for the species, by assessing growth and survival of juveniles as well as the digestive capabilities of adul...

The greater duckweed Spirodela polyrhiza (Lemnaceae) is a free-floating freshwater macrophyte. effect of dietary inclusion in the feed common carp Cyprinus carpio fry was evaluated. control (SP0) contained soybean meal as primary protein source. In four experimental feeds, incorporated at levels 5% (SP5), 10% (SP10), 15% (SP15), and 20% (SP20) replacing meal. Broken-line regression showed that ...

A microcosm study was conducted in Okeechobee, County, Florida, to evaluate the P removal potential of several aquatic macrophytes and "unconventional" terrestrial crops cultured on dairy lagoon wastewaters. Existing conventional spray field crops in this region that are irrigated with dairy wastewaters are estimated to remove 23 mgP/m-'-day. Effects of season and hydraulic retention time (HRT)...

Selenium (Se) is an essential trace element for humans and animals with a narrow window between deficiency toxicity levels. Application of conventional chemical Se fertilizers to increase the content crops in deficient areas could result environmental contamination due fast leaching inorganic Se. Slow-release Se-enriched biofertilizers produced from wastewater treatment may therefore be benefic...