Organophosphorus compounds (OPs) have been widely used as effective insecticides. As a result, using too many OPs causes the residues of pesticides to be washed away into the water or soil, not only polluting water and soil, also directly or indirectly affecting environment and human health. Besides many countries and terrorists also use them as chemical warfare weapons. They are very dangerous neurotoxins to humans, animals and the environment. In the soil, there are many microorganisms that can degrade OPs, helping to release the accumulation of these toxic substances. In this study, two effective OP-degrading bacterial strains P9 and H14 has been isolated from agricultural land in Ha Nam province, Vietnam. We had used DNA barcodes (16S rRNA) to molecular identification of Klebsiella variicola (P9) and Priestia aryabhattai (H14) and deposited in GenBank MW644772, MW644771, respectively. Moreover, at an initial concentration of methyl parathion 50 mg/L, in investigative culture mediums and conditions, strain P9 degraded 100% of methyl parathion after 7 days in Luria-Bertani (LB) liquid culture. Maximum growth of P9 strains was observered after 6 days incubation (OD600=3.34). This study is an effort to open a direction of applying them in the treatment of OPs contaminated soils and water.

In this paper, a manufacturing process of eco-friendly preservative oil from Basa fish grease of Agifish company was shown (called BDO-VN). The obtained product was examined to protect CT3 steel and blackened CT3 steel by using natural and accelerated test method. The results pointed out that the BDO-VN oil preserved well CT3 steel after testing 2 months, blackened CT3 steel after testing 3 months by natural test method.

In this paper, DG19 Water Treatmnent Tablets were researched and developed by the Department of Biotechnology, Joint Vietnam-Russia Tropical Science and Technology Research Centre to determine the processing threshold and effective assessment when treating water. The results showed that in the treated water sample, the initial microorganisms (E. coli < 107 CFU/mL, Total Coliform < 108 CFU/mL, Streptococci faecal < 108 CFU/mL, Pseudomonas aeruginosa < 108 CFU/mL, Spores of sulfite-reducing anaerobic bacteria < 106 CFU/mL) were not detected; heavy metals with initial concentration (Zn2+ ≤ 8 mg/L) after treatment, the obtained value less than 2 times or not detected; Permethrin insecticide from an initial concentration of ≤ 80 µg/L, after treatment with a concentration of < 15,6 µg/L or undetectable, meets the standards of QCVN 01-1:2018/BYT. These natural water sources (rivers, streams, lakes, fields) in two localities Bao Thang, Lao Cai province, and in Quang Dien district, Thua Thien Hue province, when using DG19 tablets in water treatment, the indicators as (microorganisms, turbidity, color, odor, arsenic) were lower when compared with QCVN 6-1:2010/BYT and QCVN 01-1:2018/BYT, the water after treatment was standards for use as drinking water.

This paper shows the process of preparation of an anti-mold product containing α-brom cinnamaldehyde transformed from Vietnam cinnamon oil. The obtained α-brom cinnamaldehyde in the product is confirmed by modern chemical physic methods such as: IR, 1H-NMR, 13C-NMR. 6 strains of mould on military leather shoes are isolated and identified by morphology characters. The obtained product is examined by acceleration test method. The result indicates strong inhibitory effect of α-brominated cinnamaldehyde on the development of the mould destroying military leather shoes.