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1

Peroxidases produced by new ligninolytic Bacillus strains isolated from marsh and grassland decolourized anthraquinone and azo dyes

100%
Falade A., Mabinya L., Okoh A., Nwodo U.
Polish Journal of Environmental Studies
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2019
|
tom 28
|
nr 5
The biotechnological relevance of ligninolytic organisms remains topical and may remain so in the foreseeable future. The enzyme battery produced by ligninolytic bacteria, including Bacillus species, has shown immense industrial significance. Consequently, peroxidases produced by newly isolated ligninolytic Bacillus strains from the marsh and grassland in Hogsback forest reserve of the Eastern Cape Province of South Africa were evaluated for decolourization of anthraquinone (Remazol Brilliant Blue R-RBBR) and azo (Congo Red-CR) dyes. Maximum dye decolourization was observed with the peroxidase from Bacillus sp. NWODO-3: CR (69.89±2.64 %) and RBBR (72.12±0.38 %). Dye decolourization readings for peroxidases from the other Bacillus strains were CR: 55.06±5.48 %, RBBR: 70.45±0.0 % (Bacillus sp. MABINYA-1), 42.62±5.55 % and 42.42±4.82 % against CR for Bacillus sp. MABINYA-2 and Bacillus sp. FALADE-1, respectively. RBBR was less susceptible to the attack by crude peroxidase produced by Bacillus sp. MABINYA-2 and Bacillus sp. FALADE-1 as the dye decolourization activities observed were 4.91±0.36 % and 1.19±0.0 %, respectively. These results suggest the industrial relevance of peroxidases from the new ligninolytic Bacillus strains in bioremediation.
2

Evaluating Nahoon Beach and canal waters in Eastern Cape, South Africa: a public health concern

76%
Ebomah K., Sibanda T., Adefisoye M., Nontongana N., Nwodo U., Okoh A.
Polish Journal of Environmental Studies
|
2019
|
tom 28
|
nr 3
Contamination of water resources by pathogens due to ever increasing anthropogenic activities and the related disease burden remains a major concern of water quality globally. This study evaluated the physicochemical and microbiological quality indices of Nahoon Beach and its canal waters in South Africa over a period of 12 months (September 2014 to August 2015). Water samples were collected bi-weekly from 6 sampling points (3 on the beach and 3 on the canal) and analyzed using standard methods. The physicochemical qualities of the beach and canal waters ranged as follows: turbidity 3.3-99.9 NTU, temperature 15-25ºC, pH 7-10, electrical conductivity 30.0–741.7 µS/cm, and total dissolved solids 19-546 mg/l. As for microbial counts of the water samples, Escherichia coli counts ranged in the order of 10¹-10³ CFU/100 ml while Enterococcus counts varied in the order of 10¹-10² CFU/100 ml. This study underscores the need for the protection of recreational water resources to safeguard public health.
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