Anthony M. Ugbenyen, John J. Simonis and Albertus K. Basson
Flocculants are chemicals that mediate flocculation process, by aggregating colloids from suspension to form floc. Chemical flocculants are hazardous to the environment, which inform the search for safer and eco-friendly alternatives from microorganisms. Bacterial strains were isolated from water and sediment samples collected from Sodwana Bay, South Africa, and physiological properties of the bacterial strains were observed. Flocculation test using kaolin clay suspension was done on all isolates and the ones that showed flocculating activity were identified molecularly using 16 rRNA gene sequence analysis. Forty marine bacteria isolates were gotten from sediments and water samples collected from Sodwana Bay. Most of the isolates exhibited a range of colony pigmentation (pink, creamy, yellow, and white). After purification of individual isolates, they were screened for their potential to produce bioflocculant. The result revealed that isolates marked SOD3, SOD10, SOD12, SOD26, SOD27, SOD28, SOD32, SOD33 and SOD34 produced bioflocculants as shown by the flocculating activities from their crude extract. All these isolates showed good flocculation of kaolin clay suspension above 60% (flocculating activity) except SOD12. These bioflocculant producing isolates were identified as Pseudoalteromonas sp, Alcaligenes faecalis, Bacillus subtilis, Bacillus cereus, Bacillus stratosphericus. The results showed Sodwana Bay, South Africa as a reservoir of bacteria with potential to produce flocculants. However, further studies on the optimisation of culture conditions for bioflocculant production, extraction, characterisation and application of isolates is on the way to underscore the biotechnological importance of these microbes as producers of substitutes to harmful chemical flocculants commonly used in water and wastewater treatment.
Kome Otokunefor, Victor Ogechi Osogho and Chijindu Precious Nwankwo
Salmonella 4,5,12:i:−, Escherichia coli and Klebsiella pneumoniae on a UK pig farm. J Antimicrob Chemother., 69(8), 2098-2101.
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Jacoby, G.A., Strahillevitz, J., and Hooper, D.C., 2014. Plasmid-mediated quinolone resistance. Microbiol Spectr., 2(2), doi:10.1128/microbiolspec
Olayide F. Obidi, Onyiye V. Okoli and Simon C. U. Nwachukwu
multiplex PCR using species-specific primers based on the region extending from 16S rRNA through 23S rRNA. FEMS microbiology letters 250, 55-62.
Martinez, K., Ferrer, I., Hernando, M., Fernández-Alba, A.R.g., Marcé, R.M., Borrull, F., Barcelo, D., 2001, Occurrence of antifouling biocides in the Spanish Mediterranean marine environment. Environmental technology 22, 543-552.
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Ohwoavworhua, F., Adelakun, T., 2005, Phosphoric acid-mediated depolymerization and
Temitope O. Olomola, Tawakalit O. Kelani, Mojisola C. Cyril-Olutayo and Joseph M. Agbedahunsi
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He, J.-Y., Zhang, W., He, L.-C. and Cao, Y.-X., 2007. Imperatorin induces vasodilatation possibly via inhibiting voltage dependent calcium channel and receptor-mediated Ca 2+ influx and release. Eur. J. Pharmacol ., 573 , 170-175.
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Asiata Omotayo Ibrahim, Misbaudeen Abdul-Hammed, Samuel Adewale Adegboyega, Monsurat Olajide and Akeem Abefe Aliyu
., Fogliano, V., Ambrosino, P., Salucci, M., Gennaro, L., Bugianesi, R., Giuffrida, F., Quaglia, G.J., 2002, Nutritional value of cherry tomatoes ( Lycopersicon esculentum Cv. Naomi F1) harvested at different ripening stages. Journal of Agricultural and Food Chemistry, 50 (22): 6550-6556.
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Introduction of non-indigenous exotic species to new areas, where they may establish viable populations and become invasive, is a considerable problem in the protection of nature worldwide, as these species may alter the indigenous species population structure and potentially even decrease the biodiversity. The European fauna underwent through major negative changes on the continent and nowadays, it experiences another new treat, represented by the expanding aquarium pet trade, and with it, associated species (and disease) introductions. Exotic freshwater crustaceans are one of the taxa widely incorporated in the business, counting a remarkable number of species. Recent records of the exotic marbled crayfish or Marmorkrebs (Procambarus fallax f. virginalis) in German in open ecosystems in Slovakia pointed to human-mediated introductions associated with aquarium pet trade in the country. In this regard, a study of the aquarium pet trade both in expositions and shops and online was assessed. Several crustacean taxa are available both in pet trade exhibitions and online through the Internet. Altogether 26 different species were identified in the aquarium trade in Slovakia. These are Procambarus fallax f. virginalis, P. clarkii, P. alleni, Cherax quadricarinatus, C. destructor, C. holthuisi, C. peknyi, Cambarellus patzcuarensis and C. diminutus occurring in the aquarium pet trade in Slovakia (n = 9). Procambarus fallax f. virginalis, P. clarkii and C. patzuarensis are the most common in this regard. There is also a quantity of other related taxa in the aquarium pet trade in Slovakia, mainly Caridina spp. (n = 5), Neocaridina spp. (n = 4), Atyopsis moluccensis, Atya gabonensis, Arachnochium kulsiense and several taxa of exotic crabs (n = 5) belonging to three different genera (Cardiosoma, Geosesarma and Gecarinus) present. Neocaridina davidi is identified as the most frequent in this regard. As some of the species can become established and form viable populations in natural ecosystems in Europe, we alert the public to handle the animals responsibly and thus maintain and protect indigenous European fauna.
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Maryam Rashidi, Atefeh Chamani and Minoo Moshtaghi
Curry, C.M., Antze, B., Warrington, M.H., Des Brisay, P., Rosa, P. & Koper N. (2018a). Ability to alter song in two grassland songbirds exposed to simulated anthropogenic noise is not related to pre-existing variability. Bio-acoustics , 27(2), 105−130.
Curry, C.M., Des Brisay, P.G., Rosa, P. & Koper N. (2018b). Noise source and individual physiology mediate effectiveness of bird songs adjusted to anthropogenic noise. Scientific Reports , 8(1), 3942. DOI: 10.1038/s41598-018-22253-5.
Díaz, L. (2006). Influences of forest type and forest structure on bird
Matej Remenár, Edita Karelová, Jana Harichová, Anna Kamlárová, Kristína Krčová, Marcel Zámocký and Peter Ferianc
ies D. H. 2003. Efflux-mediated heavy metal resistance in prokaryotes. FEMS Microbiol. Rev. 27: 313-339.
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R emenár M., K arelová E., H arichová J., Z ámocký M., K amlárová A. & F erianc P. 2015. Isolation of previously uncultivable bacteria from a nickel contaminated soil using a diffusion-chamber-based approach. Appl. Soil Ecol. 95: 115-127.
S alvador M., C arolina G. & J ose E. 2007. Novel nickel