Papers by Oghenerobor B Akpor
F1000Research, Jun 3, 2024
Previous Title 'Effects of steeping duration and concentration of metabolites from rhizosphere ba... more Previous Title 'Effects of steeping duration and concentration of metabolites from rhizosphere bacteria on germinability of cowpea (Vigna unguiculata), soybean (Glycine max), sesame (Sesamum indicum) and okra (Abelmoschus esculentus)'
F1000Research, Jan 8, 2024
International Journal of Sciences: Basic and Applied Research, Apr 28, 2014
Asian Journal of Agriculture and Biology, Feb 17, 2020
Studies have revealed that adaptive life-history behaviour and reproductive capacity of an organi... more Studies have revealed that adaptive life-history behaviour and reproductive capacity of an organism are influenced by the amount and quality of nutrients. Furthermore, it has been established that the balance between energy production and utilization is crucial to the animal's survival and reproduction visa -vis the organism's ability to adjust their developmental, physiological or behavioural response to environmental conditions. In the present study an attempt was made to investigate the effect of cassava starch supplementation on chill-coma recovery, reproductive capacity and some metabolicinduced changes in oxidative status of Drosophila melanogaster, which was raised on a normal fly diet supplemented with 500, 750, 1000, 1250, 1500 and 2000 mg/mL starch extracted from three cassava cultivars (TMS 92/0326, TMS 30572 and Omu-Aran local sweet cassava). Data generated from this study showed that flies consuming starch-supplemented diet have a higher level of cold resistance, an increased survival rate as well as enhanced egg to adult viability. However, flies raised on starchsupplemented diet showed a significantly higher concentration of thiobarbituric acid reactive substances (TBARS) with a compensatory significant increase in activities of antioxidant defense enzymes, and nitric oxide scavenging capacity compared to flies raised on the normal fly diet. In conclusion, data obtained from this study revealed that supplementation to the D. melanogaster diet with cassava starch enhances the organism's survival rate, and adaptive response to cold stress, with concomitant improvement in antioxidant status.
Food Research, Feb 10, 2020
The in vitro antioxidant property and digestibility of chicken feather protein hydrolysate (CFPH)... more The in vitro antioxidant property and digestibility of chicken feather protein hydrolysate (CFPH) were evaluated in this study. The antioxidant property of CFPH obtained following chemical treatment of chicken feather waste involving precipitation with various acids (H 2 SO 4 , HNO 3 , TCA and HCl) was determined via its scavenging action against 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical, iron reduction power and metal ion chelating activity. Data obtained showed that CFPH HNO3 had the highest DPPH scavenging activity while CFPH TCA exhibited the highest ferric (Fe 3+) reduction potential. On the other hand, CFPH TCA , CFPH H2SO4 and CFPH HNO3 showed a similar capacity for Fe 2+-chelation compared to CFPH H2SO4 with the least chelating potential. The in vitro protein digestibility of the CFPH of the various acids ranged from 62.30±1.0% (CFPH HNO3) to 73.10±1.3% (CFPH TCA) and were significantly (p < 0.05) higher compared to the raw feather (23.80±0.5%). These results indicate that CFPH may be useful as antioxidants in animal feed formulations and also serve as additional source of essential nutrients in feeds.
The Open Agriculture Journal
Background: Seed quality, an important determinant of germination and vigor potential, can be imp... more Background: Seed quality, an important determinant of germination and vigor potential, can be improved through seed priming. This study was therefore aimed at assessing the effects of steeping duration and inoculum concentration on the germination and seedling growth of five seed crops through priming with growth-promoting rhizobacteria. Methods: Broth cultures of five bacterial strains, belonging to Providencia vermicola (2 strains), P. rettgeri (2 strains), and Bacillus cereus (1 strain), isolated from rhizosphere were used for priming in the study. Seeds of cowpea (Vigna unguiculata), soybean (Glycine max), sorghum (Sorghum bicolor), sesame (Sesamum indicum), and okra (Abelmoschus esculentus) were used as experimental materials. To determine the effects of steeping duration, viable seeds of the respective crops were primed with broth cultures of the respective isolates and allowed to stand for a known duration (1, 2, 3, 4, or 5 h). Then, another set of viable seeds was steeped in...
International Journal of Physical Sciences, Oct 4, 2010
Scientific Research and Essays, 2010
The world is faced with problems related to the management of wastewater due to extensive industr... more The world is faced with problems related to the management of wastewater due to extensive industrialization, increasing population density and a highly urbanized society. The quality of wastewater effluents is responsible for the degradation of receiving water bodies, such as lakes, rivers, streams. In order to meet Goal 7 of the Millennium Development Goals “ensure environmental sustainability” and maximization of the health and environmental benefits associated with the use and discharge of wastewater, several legislations and guidelines have been developed, both at international and national levels. The two main processes for the removal of impurities from wastewater influents are chemical and biological. Because of the many drawbacks of chemical wastewater treatment, biological treatment is advocated in the last few decades. Biological phosphorus and nitrogen removal systems have been extensively investigated for municipal wastewater treatment over the past decades. Several ques...
The aim of this study was to access the protective potential of Annona senegalensis leaf extract ... more The aim of this study was to access the protective potential of Annona senegalensis leaf extract against selected fungal pathogens of selected seedlings (sorghum, tomato and okra). Prior to use, the seeds were surfaced sterilized and viability test carried out. In the study, the effective concentration of the extract, optimum soaking time in the extract and infective concentration of the fungal pathogens were determined. The outcome of the effective concentration of the extract revealed the germination percentage of the sorghum seeds to range from 71% to 93.36%. For the okra seeds the result ranged from 38% to 86%, while for that of the tomato seeds the germination profile was observed to range from 28.5% to 71%. With respect to the optimum soaking time, the end result for the germination of the sorghum seeds was seen to be high at100 % which were recorded in most of the soaking time seen at 30 min, 90 min, 120min, 180 min, 210 min. Lowest value of 78.5 % was seen at 240 min soaking...
Stem bark and root of Khaya senegalensis were extracted with ethyl acetate and n-Hexane and extra... more Stem bark and root of Khaya senegalensis were extracted with ethyl acetate and n-Hexane and extracts screened for metabolites, antibacterial activity. There were also used to reduce AgNO3 to synthesize AgNPs and their antibacterial effects studied. A number of metabolite example flavonoids, steroids, tannins etc were discovered. The stem bark extract show higher activities on all the four bacterial isolates compared to the root extract: on K. pneumoniae (28.1±0.42), B. subtilis (20.1±1.21).while the root extract show lower activity on the test organisms at 26.3± 0.12 on K. pneumoniae and 22.1±0.20 on S. epidermidis. The activities of the nanoparticles are higher than those of the crude extracts and standard antibiotics used as control. The zones of inhibition around the bacterial colonies by the particles are far wider around each organism challenged. AgNPs bark extract on B. subtilis produced 31.2±0.11zone of inhibition of 24. 24.3±1.21 and 28.2±2.12 by Streptomycin and Tetracyclin...
African Journal of Biotechnology, 2008
The objective of this study was to ascertain the effects of pH and temperature on nutrient uptake... more The objective of this study was to ascertain the effects of pH and temperature on nutrient uptake efficiency of 3 wastewater protozoan isolates (Aspidisca (A), Trachelophyllum (B) and Peranema (C)) that have previously been screened for nutrient uptake ability. The study was carried out in shake flask at pH 5, 6, 7, 8 and 9 and incubation temperatures of 25, 30 and 35oC for 96 h. The results revealed optimum pH ranges for the uptake of phosphate and nitrate to be 7 to 9 and 5 to 7, respectively. Maximum nutrient uptake was found to occur at 25oC with phosphate concentration decreasing from 64.74 to 10.21 mg/l, 63.09 to 8.54 mg/l and 64.47 to 6.36 mg/l, for isolates ‘A’, ‘B’ and ‘C’, respectively. Also, nitrate concentration was found to decrease from 24.71 to 4.91 mg/l for isolate ‘A’, 24.47 to 11.15 mg/l for isolate ‘B’, and 24.58 to 15.00 mg/l for isolate ‘C’ at the same temperature. An increase in COD was observed in mixed liquor inoculated with the test isolates. The study has b...
Food Research, 2020
The major challenge influencing fruits economic value is the relatively short shelf-life. This st... more The major challenge influencing fruits economic value is the relatively short shelf-life. This study preserved fruit juice blend from pineapple, watermelon and orange using lime juice as biopreservative comparing its effectiveness with ascorbic acid and citric acid as chemical preservatives during storage at ambient temperature (27±2oC) for five weeks. The acceptability of the juice by consumer, biochemical changes and microbial load was also evaluated on a weekly basis. From the results, all the samples were acceptable on a 9-point hedonic scale (8.70-8.90) with 1% lime biopreserved juice blend was the most preferred. This shows that that lime effectively controlled the rate at which increase pH and decrease of TTA occurred during storage by double-fold when compared with ascorbic and citric acid used in the study. A minimal decrease in pH of 0.75% was documented during the five weeks of study. The specific gravity of the juice was relatively table during storage except for the unp...
Nigerian Journal of Biotechnology, 2018
Food Research, 2020
The in vitro antioxidant property and digestibility of chicken feather protein hydrolysate (CFPH)... more The in vitro antioxidant property and digestibility of chicken feather protein hydrolysate (CFPH) were evaluated in this study. The antioxidant property of CFPH obtained following chemical treatment of chicken feather waste involving precipitation with various acids (H2SO4, HNO3, TCA and HCl) was determined via its scavenging action against 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical, iron reduction power and metal ion chelating activity. Data obtained showed that CFPHHNO3 had the highest DPPH scavenging activity while CFPHTCA exhibited the highest ferric (Fe3+) reduction potential. On the other hand, CFPHTCA, CFPHH2SO4 and CFPHHNO3 showed a similar capacity for Fe2+ -chelation compared to CFPHH2SO4 with the least chelating potential. The in vitro protein digestibility of the CFPH of the various acids ranged from 62.30±1.0% (CFPHHNO3) to 73.10±1.3% (CFPHTCA) and were significantly (p < 0.05) higher compared to the raw feather (23.80±0.5%). These results indicate that CFPH may be...
Results in Engineering, 2019
Modified chicken feather reduced the corrosion rate of mild steel in drilling mud as deduced from... more Modified chicken feather reduced the corrosion rate of mild steel in drilling mud as deduced from electrochemical potentiodynamic polarization technique, albeit, with observed infestation of the test environment by microbes over protracted exposure period of 92 days. The corrosion rates with and without the addition of 0.3g of hydrolyzed feather per 100 ml of drilling mud were 1.70 and 1.95 mm/yr, respectively; which corresponded to inhibition efficiency of 13% over the immersion period. The corresponding charge transfer resistances, a measure of corrosion rates were 1480.4 and 1780.0 Ω, respectively; in the uninhibited and hydrolyzed-feather inhibited environments. The voltage over the double layer capacitor as obtained from the polarization studies numerically increased from À0.907 to À0.948 V which indicated adsorption of moieties in the inhibitor and probably some corrosion products on the surface of the mild steel specimen.
Objective The hydrolysis of chicken feather waste was carried out using sodium hydroxide and the ... more Objective The hydrolysis of chicken feather waste was carried out using sodium hydroxide and the hydrolysed feather solution precipitated using different acids (nitric acid, sulfuric acid, hydrochloric acid and trichloroacetic acid). Hydrolysates of the different acids were evaluated for antioxidant activity via 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging, ferric reducing power and metal chelating activities. In addition, the in vitro protein digestibility of the respective acid hydrolysates was carried out. Results: Data obtained showed that nitric acid-precipitated hydrolysate had the highest DPPH scavenging activity while the hydrolysate precipitated with trichloroacetic acid exhibited the highest ferric (Fe3+) reduction potential. On the other hand, trichloroacetic acid-, sulfuric acid- and nitric acid-precipitated hydrolysates showed similar metal chelating potential compared to hydrochloric acid-precipitated hydrolysate with the least chelating potential. The in vi...
Journal of Environmental Science and Technology, 2018
Journal of Agriculture and Ecology Research International, 2017
Medicinal plants are in nature and are cultivated worldwide and also commercially. This study was... more Medicinal plants are in nature and are cultivated worldwide and also commercially. This study was aimed at assessing the protective potential of leaf extracts of Annona senegalensis against selected fungal pathogens of sorghum seeds. Before the use of the seeds, they were checked for viability and surface sterilized. In this study, the effective concentration, optimum soaking time, protective potential of the extract and antibacterial effect of the extracts were carried out. During each setup, at the end of the planting period, percentage germination, germination index, germination capacity, germination rate, germination time and seed vigour were calculated. The most effective concentrations of the aqueous, n-hexane, ethanol extracts of Annona senegalensis and copper sulphate solution were observed to be 2000 mg/L, 7000 mg/L, 2000 mg/L and 5000 mg/L respectively while the best soaking times of the seeds in the copper sulphate solution, aqueous and n-hexane extracts of Annona senegalensis were 30 min while for ethanol extract was 60 min. The infected seeds that were treated with the extracts showed high level of germination and seed vigour. This study was able to reveal the potential of Annona senegalensis in the Original Research Article
Advances in Bioscience and Bioengineering, 2014
British Biotechnology Journal, 2014
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Papers by Oghenerobor B Akpor