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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology
Siti Aqlima Ahmad
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary

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Biological Remediation of Cyanide: A Review Karamba Kabiru Ibrahim; Mohd Arif Syed; Mohd Yunus Shukor; Siti Aqlima Ahmad
BIOTROPIA - The Southeast Asian Journal of Tropical Biology Vol. 22 No. 2 (2015)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1249.896 KB) | DOI: 10.11598/btb.2015.22.2.393

Abstract

Cyanide and its complexes are produced by industries all over the world as waste or effluents. Biodegradation is considered to be the cheapest and the most effective method to get rid of cyanide in the environment. Several studies on different types of microorganisms that can degrade cyanide in the environment have been carried out. Hydrolytic, oxidative, reductive, and substitutive/transfer reactions are some of the common pathways used by microorganisms in cyanide degradation. Biodegradation of cyanide can occur aerobically or an-aerobically depending on the environmental conditions. Immobilised enzymes or microorganisms prove to be very effective method of degradation. Microorganisms such as Klebsiella oxytoca, Corynebacterium nitrophilous, Brevibacterium nitrophilous, Bacillus spp., Pseudomonas spp. and Rhodococcus UKMP-5M have been reported to be very effective in biodegradation of cyanide.
ISOLATION AND CHARACTERIZATION OF A MOLYBDENUM-REDUCING AND PHENOLIC- AND CATECHOL-DEGRADING Enterobacter sp. STRAIN SAW-2 Mohd Khalizan Sabullah; Mohd Fadhil Rahman; Siti Aqlima Ahmad; Mohd Rosni Sulaiman; Mohd Shukri Shukor; Azlan Jualang Gansau; Nor Aripin Shamaan; Mohd Yunus Shukor
BIOTROPIA - The Southeast Asian Journal of Tropical Biology Vol. 24 No. 1 (2017)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2017.24.1.550

Abstract

Molybdenum is an emerging pollutant worldwide. The objective of this study is to isolate molybdenum-reducing bacterium with the ability to grow on phenolic compounds (phenol and catechol). The screening process was carried out on a microplate. The bacterium reduced molybdenum in the form of sodium molybdate to molybdenum blue (Mo-blue). The bacterium required a narrow pH range for optimal reduction of molybdenum, i.e. between  pH 6.3 and 6.8, with temperature between 34 and 37 oC. Molybdate reduction to Mo-blue was best supported by glucose as the carbon source. However, both phenol and catechol could not support molybdate reduction. Other requirements for molybdate reduction included sodium molybdate concentrations between 15 and 30 mM, and phosphate concentration of 5.0 mM. The bacterium exhibited a Mo-blue absorption spectrum with a shoulder at 700 nm and a maximum peak near the infrared region at 865 nm. The Mo-reducing bacterium was partially identified as Enterobacter sp. strain Saw-2. The capability of this bacterium to grow on toxic phenolic compounds and to detoxify molybdenum made it a significant agent for bioremediation.
Co-Authors Azlan Jualang Gansau Karamba Kabiru Ibrahim Mohd Arif Syed Mohd Fadhil Rahman Mohd Khalizan Sabullah Mohd Rosni Sulaiman Mohd Shukri Shukor Mohd Yunus Shukor Nor Aripin Shamaan