Effect of heavy metals on duckweed growth

Abstract

In this study, three clones of the duckweed genus Lemna, collected from three different regions of Vietnam Binh Thuan Bac Giang and Ben Tre were used to evaluate the growth and development in a culture medium containing different concentrations of As3+, Cd2+, or Pb2+. During 14 days of incubation, the growth rate was determined daily by measuring the surface area of all plants of each sample. Experimental results show that the three Lemna clones could grow in nutrient medium contaminated by heavy metal at a concentration of 0.3-0.5 mg/L for As3+, 0.15-0.3 mg/L for Cd2+, and 0.15 mg/L for Pb2+. At these concentrations, the division rate of the treated clones was several times higher than that of the controls. The highest increase in the surface area was recorded for Lemna BTN (68.47 times higher when cultured in medium supplemented in 0.3 mg/L Pb2+ than under control conditions). The surface area of Lemna BTR cultured in a medium supplemented with 0.3 mg/L As3+ was 54.65 times higher than in medium without arsenic. The obtained results showed that Lemna BGG and Lemna BTR can tolerate arsenic and cadmium pollution while Lemna BTN tolerates lead pollution.

Investigation of wine fermentation of three-leaf cayratia (Cayratia trifolia L.) using Saccharomyces cerevisiae 2.1

“…The fermentation of 1 L results shows that the ethanol content meets the Vietnam Standard 6-3:2010/BYT of the Ministry of Health for wine, which is also similar to fermentation studies on watermelon wine (Ngo et al, 2011), pineapple wine (Nguyen et al, 2013), and sim wine (Nguyen, 2010). However, the concentration value is lower than that of fruit wine fermented by a tolerant yeast strain isolated from fruit but aged at 35 °C; for example, the strain S. cerevisiae AG2.1 is 11.36% (v/v) (Doan et al, 2018c), S. cerevisiae CM3.2 is 12.46% v/v (Doan et al, 2019b).…”

Investigation of bacteria composition in Artemia biomass culture under different conditions

“…The concentrations of TAN (NH 3 /NH 4 + ) and NO 2 in the experiment tended to be low at the beginning and increase gradually over time due to the accumulation of organic matter, such as feces, peeled shells, leftovers, etc. The creation of biofloc b adding mollasses, as well as of Bacillus, had relatively low NO 2 and TAN content due to the active activity of nitrogen-metabolizing bacteria, especially Nitrosomonas and Nitrobacter (Nguyen et al, 2021;Ngo et al, 2015).…”

An environment monitoring system for a rice production model adaptive to climate change in the Mekong Delta of Viet Nam

“…Currently, the technique of rice cultivation according to water-saving irrigation is interesting in the Mekong Delta. Irrigation-saving techniques are also being studied to be able to replace continuous flooding in rice cultivation in the Mekong Delta (Lan Phuong et al, 2012;Nguyen et al, 2022;Nguyen et al, 2021). In addition, according to Lan Phuong et al (2012), applying water-saving irrigation techniques helps rice plants to sprout better than the continuous flooding method The use of organic fertilizers in rice production increases sustainable cultivation and adaptation to climate change as well as meets export-oriented consumer de-mand for organically produced foods (Van Toan et al, 2019).…”