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Institution

Rivers State University of Science and Technology

EducationPort Harcourt, Rivers, Nigeria
About: Rivers State University of Science and Technology is a education organization based out in Port Harcourt, Rivers, Nigeria. It is known for research contribution in the topics: Population & Threatened species. The organization has 1826 authors who have published 1833 publications receiving 15183 citations.


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Journal ArticleDOI
05 Jan 2019
TL;DR: In this article, the effect of systemic risk on the dynamics of stock prices in Nigeria capital market was examined. And the authors concluded that systemic risk has significant effect on stock prices and recommends, among others, that the management of the capital market should ensure that the operating environment is risk minimum to ensure appreciable stock prices by developing strategies and policies aim at managing the systematic risk in the operating environments and engage a regular environmental impact assessment on systemic risk, to avert it's negative effect.
Abstract: This study examined the effect of systemic risk on the dynamics of stock prices in Nigeria capital market. The objective was to investigate the dynamic effect of systemic risk on stock prices traded on the floor of Nigeria stock exchange. Time series data was sourced from Central Bank of Nigeria Statistical Bulletin from 1990-2017. Stock prices were modeled as the function of prices risk, liquidity risk, interest rate risk and exchange rate risk. Multiple regression with ordinary least square properties of co-integration was used to examine the relationship between the dependent and the independent variables. The study found price and liquidity risk have positive effect on stock price while interest rate and exchange rate risk have negative effect on stock prices of equities traded on Nigeria stock exchange. It concludes that systemic risk has significant effect on stock prices and recommends, among others, that the management of the capital market should ensure that the operating environment is risk minimum to ensure appreciable stock prices by developing strategies and policies aim at managing the systematic risk in the operating environment and engage a regular environmental impact assessment on systemic risk, to avert it’s negative effect on stock prices.

3 citations

Journal ArticleDOI
TL;DR: Different extents of alkylation or acylation between histones and NHCP by metabolically activated CCl4 under aerobic in vitro conditions are suggested, and differential inhibition of CCl 4-alkylation-acylation by cysteine is suggested.
Abstract: The in vitro covalent binding of 14C-labelled carbon tetrachloride [14C]CCl4 to histones and non-histone chromosomal proteins (NHCP) under microsome-mediated aerobic conditions was determined. Whole chromatin was prepared from purified nuclei isolated from livers of B6C3F1 hybrid mice and incubated with 2.5, 5.0 and 10.0 mumol [14C]CCl4 in the presence of microsomes isolated from the same tissue, at 4 mg protein, and an NADPH-regenerating system at 37 degrees C for varying incubation times. Binding of [14C]CCl4 to histones and NHCP was also determined in the presence of 5 mM L-cysteine. The results show that the activated intermediate of CCl4 bound more to histones than to NHCP in a dose- and time-dependent manner, and that 5 mM L-cysteine inhibited the binding of the activated intermediate of CCl4 to histones by 59%, without affecting the binding to NHCP. These data suggest different extents of alkylation or acylation between histones and NHCP by metabolically activated CCl4 under aerobic in vitro conditions, and differential inhibition of CCl4-alkylation-acylation by cysteine. This suggestion does not exclude other possible mechanisms of action.

3 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the effectiveness of resin/exudates in corrosion prevention of reinforcement in reinforced concrete cubes and found that the failure bond strength, pull out bond strength and maximum slip of the resin coated reinforced cubes were higher by 19, 84, and 112% respectively than those obtained from the controlled tests.
Abstract: Corrosion of steel reinforcement is one of the important factors that are responsible for the short service life of reinforced concrete members, in marine structures like bridges, piers and jetties. This study, investigated the effectiveness of resin/exudates in corrosion prevention of reinforcement in reinforced concrete cubes. The reinforced concrete cubes of dimension (150mm x 150mm x 150mm) were coated with dacryodes edulis resin paste of various thicknesses: 150um, 250um, and 300um. The reinforced concrete cubes were exposed to a corrosive environment for 60days after 28 days of curing. in order to stimulate accelerated corrosion of the reinforcing steel. Another test was carried out with steel reinforcement cubes, whose steel reinforcement were not coated with dacryodes edulis resin but also exposed to the same corrosive environment. for the same 60 days after 28 days curing. The control test was carried out with a set of concrete cubes that were not coated with dacryodes edulis but were not exposed to a corrosive environment. The reinforced concrete cubes were subjected to tensile and pull out bond strength in order to access the effectiveness of the resin on the corrosion prevention, by enhancing the tensile and pull out bond strength of the reinforcement in the experimental cubes. Results obtained indicated that the failure bond strength, pull out bond strength and maximum slip of the resin coated reinforced cubes were higher by (19%), (84%) and (112%). respectively than those obtained from the controlled tests. Similar results were obtained for the maximum slip (the resin coated and non-corroded steel members) had higher values of maximum slip compared to the cubes that had corroded steel reinforcements. For the corroded beam members, the failure bond strength, pull out bond strength and maximum slip of the resin coated reinforcements were lower by (22%), (32%) and (32%). respectively than those obtained from the controlled tests. The resin (mdacryodes edulis) inhibit corrosion of the reinforcement, hence enhanced strength to the reinforcement. http://dx.doi.org/10.4314/njt.v37i1.11

3 citations

Journal ArticleDOI
TL;DR: The biology of Sylepta derogata Fabricius was studied in the laboratory and the most striking difference between the 1st and 2nd instars was the presence on the 2nd of two brown spots on the dorsal aspect of the prothoracic segments.
Abstract: The biology of Sylepta derogata Fabricius was studied in the laboratory. The number of larval instars varied from 5 to 6 when fed singly. The larva possesses three pairs of thoracic legs and four abdominal prolegs. Among morphological differences between the instars, the most striking between the 1st and 2nd instars was the presence on the 2nd of two brown spots on the dorsal aspect of the prothoracic segments. Other instars were differentiated by the size and shape of the shields. The pupa is obtect and conical in shape with ten abdominal segmants, distinctly separated except the 9th and 10th segments. The genital pore occurs ventrally below the 8th abdominal segment in the female and in the male on the 9th segment. The abdomen of the male is more slender than that of the female. The life cycle was completed in 33.9 ± 0.5 days.

3 citations

Journal ArticleDOI
TL;DR: The results show that there were significant changes in the levels of almost all ten parameters at different weeks of storage and the changes were more in the units stored in the traditional refrigerator and this could pose a very high health risk to the recipient on transfusion.
Abstract: Whole blood or any of its components is stored for the purpose of future transfusion. To ensure therapeutic relevance of the product, strict adherence to instructions and procedures on the operation of a blood bank is crucial. Storage outside the stipulated temperatures could lead to biochemical changes that may reduce the therapeutic value. This study aims at evaluating the in vitro effect of storage on selected biochemical parameters (Na + , K + , Cl - , HCO3 - , Total protein, Albumin, Ca 2+ , pH, Glucose and Hemoglobin concentration) in citrate phosphate dextrose adenine (CPDA-1) whole blood stored in a Standard Blood Bank (SBB) and compare values with those stored in a Traditional Refrigerator (TR). A total of 37 apparently healthy volunteer donor subjects were used for the study. Twenty donors donated 450mL of whole blood each into CPDA-1 blood bags and were stored in a standard blood bank, while 17 units were collected from 17 donors into the same type of anticoagulant/preservatives but instead stored in a traditional refrigerator. Both refrigerators and standard blood bank were allowed the same relatively stable power supply for 35 days. Five milliliters of blood was taken at intervals of 7 days (1, 7, 14, 21, 28, and 35) from each of the bags for both SBB and TR methods of refrigeration and analyzed for ten parameters. It was observed that for both SBB and TR, K + levels increased from the 1 st to the 35 th day. K + levels for TR were significantly higher than those of SBB for days 7 (F=17.256, p= 0.000), 14 (F= 10.358, p= 0.000), 21 (F= 14.381, p= 0.000), 28 (F= 4.810, p= 0.000) and 35 (F=0.499, p=0.000). This statistically shows that the rise in K + level was more in TR refrigeration. Plasma Na + levels generally decreased for both groups. Comparison showed that Na + values for SBB were significantly higher than those of TR refrigeration for Days 7 (F= 1.684, p= 0.027) and 14 (F= 1.623, p= 0.009). Bicarbonate, albumin, pH, chloride and glucose levels for both groups were observed to decrease with storage time. Significant decreases were observed for Cl - and HCO3 - for Day 7 (F= 17.019, p= 0.000 and F= 0.404, p= 0.035 respectively), Cl - only for Day 14 and 21 (F= 3.253, p= 0.000 and F= 2.112, p= 0.000 respectively), albumin and glucose for Day 35 (F= 2.541, p= 0.036 and F= 1.272, p= 0.039 respectively) when mean values for SBB and TR were compared. Other parameters for the different days were not significant. Mean total protein levels for SBB and TR were significant for Days 7 (F= 13.136, p= 0.011); 14 (F= 9.842, p= 0.011); 21 (F= 6.344, p= 0.015) and 28 (F= 8.137, p= 0.035), while no significant difference was observed on the last day. The results show that there were significant changes in the levels of almost all ten parameters at different weeks of storage and the changes were more in the units stored in the traditional refrigerator and this could pose a very high health risk to the recipient on transfusion.

3 citations


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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20235
202210
2021203
2020300
2019220
2018108