The duckweed Spirodela oligorrhiza, growing in sterile defined nutrient media, was used to study some responses of plants to phosphorus deficiency. On a phosphate-deficient medium, growth of Spirodela soon slowed and eventually ceased. Older leaves became chlorotic, but newly formed leaves were dark green and contained much anthocyanin. The photosynthesis rate fell gradually, roots elongated, a...

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...

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...

Wastewater treatment systems collect and treat sewage that includes microplastics (MPs). However, we are not aware of any studies on the occurrence distribution MPs in wastewater stabilization ponds (WSPs), which serve small communities worldwide. Here, characterized (~45 µm–5 mm) an aerated WSP serving ~500 houses adjacent lake. Putative were most abundant duckweed (Lemna minor) sludge (75 ± 2...

This study evaluated the apparent digestibility coefficient of processed duckweed based diets and its effect on carcass composition Oreochromis niloticus.  Blanching sun-drying were employed as processing methods to reduce antinutrients in duckweed meal. The experiment was conducted two outdoor concrete ponds with an area 5 m x 3.5 m (l × b) a depth 1.5 m each, us...

Current mainstream technologies for wastewater treatment, such as activated sludge and tertiary nutrient removal are too costly to provide a satisfactory solution for the increasing wastewater problems in developing regions. Besides, these technologies do not allow for re-use of valuable energy and nutrients contained in the wastewater. This paper introduces a so called ‘Cleaner Production’ con...

Two four-week feeding trials were conducted with fingerlings of Eurasian perch (Perca fluviatilis, 3.52 ± 0.08 g) and rainbow trout (Oncorhynchus mykiss, 1.49 0.05 fed graded levels dried (DWD) fermented (DWF) duckweed meal (Spirodela polyrhiza). The purpose these two was to evaluate DWD DWF as replacements for fishmeal. Fishmeal protein substituted by 12%, 24%, 35% compared control diets conta...

Major differences stand out between edible leaves and seeds in protein quality, vitamin, and mineral concentrations and omega 6/omega 3 fatty acid ratios. Data for seeds (wheat, rice, corn, soy, lentil, chick pea) are compared with corresponding data for edible green leaves (kale, spinach, broccoli, duckweed). An x/y representation of data for lysine and methionine content highlights the group ...