Rivers State University of Science and Technology

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.

Alternations in Enzyme Activities of Clarias gariepinus Infected with Aeromonas hydrophila and Pseudomonas aeruginosa

Abstract: Clarias gariepinus were infected with Aeromonas hydrophila and Pseudomonas aeruginosa, and blood samples were collected weekly for biochemical analysis to analyse their enzyme activities and pathogenesis for four weeks. The enzymes includes: aspartate aminotransferase (AST), alkaline phosphastase (ALP), acid phosphastase (ACP) and lactate – dehydrogenase (LDH). The fish were distributed in three different groups in triplicates as: control (C1 C2 C3), A. hydrophila (A1, A2, A3) and P. aeruginosa (P1, P2, P3). After two weeks of acclimatization, A1 – A3 were injected with 1.5 ml of 106 cfu/ml of A. hydrophila, P1-P3 were injected with 1.5 ml of 106 cfu/ml of P. aeruginosa, while C1-C3 were pathogen free. At the end of the experiment, it was observed that there was a constant increase, in the enzyme activities of the infected fish, indicating increase in virulence with respect to weeks of exposure but P. aeruginosa had higher pathogenicity compared to A. hydrophila.

Mathematical modelling of the microbial growth and decay rate of pseudomas species on biodegration of Bonny light crude oil

Abstract: No abstract Keywords: mathematical modeling; microbial growth; decay rate; pseudomanas species; Bonny light crude Global Journal of Pure and Applied Sciences Vol 11(3) 2005: 423-431

What is the cost benefit ratio of sending adeno-tonsillar tissues for histology: does adenoid/tonsillar tissue in children undergo malignant transformation?

Abstract: Due to the enormous amount spent on histology of adenoid and tonsillar samples from children with adeno-tonsillectomy with no confirmed result of malignancy, it has become expedient to reconsider sending such tissues for histologyThe objective of this study was to determine the necessity of sending tissues of adenoid and tonsils for histology by means of ascertaining the prevalence of malignancy among children with adeno-tonsillectomy. This was a retrospective study done in three private hospitals that provide care for children in Enugu. Data was obtained from the medical records of 72 patients who had undergone tonsillectomy and/or adenoidectomy from September 2011 to May 2018. All the surgical cases done had their samples sent immediately for histology. A total of 72 adeno-tonsillar tissues were taken for histology of which all showed lymphoid hyperplasia with none showing any form of malignancy. Age group ranged from 6 months-18 years with 57 males and 15 females. Histology of the adeno-tonsillar tissue specimen was done among all the children with each costing 9000 Naira (26 US dollars). There were 3 tonsillectomies, 1 adenectomy and 68 adeno-tonsillectomies done. Indications for surgery were mainly upper airway obstruction for 69 cases and recurrent tonsillectomy for 3 cases. Histology revealed lymphoid hyperplasia for all cases. None of the patients in our study had histologic evidence of malignancy. Routine histopathologic examination in adeno-tonsillectomy specimens among children may be dispensable as it showed a negative cost-benefit ratio.

Quota system of employment in strategic organisations in nigeria

Abstract: There have been widespread speculations by observers, management practitioners and scholars that there has been a vandalisation of humanitarian rationalism in strategic organisations. By vandalisation of humanitarian rationalism, we mean the absolute and wanton disregard and abuse of established rules and regulations by the managers of Strategic Organisations and the control environment. The control environment (government) after establishing the necessary framework for the management of Strategic Organisations, most of the times, turns around to flout the same rules and regulations it had made to regulate social relations at work. This is done sometimes through irregular employment of staff, and at other times through unnecessary political interference from political office holders. This makes the whole idea of Quota System (QS) as an instrument of employment questionable. Quota System of employment sometimes serve as cynosure for the recruitment of unqualified persons from certain parts of the country. The incompetence of these individuals, to a large extent has led to the inability of Strategic Organisations to accomplish their mission. Strategic Organisations can be described as those organisations established by government to develop the necessary framework for socio‐ economic development in all sectors of the Nigerian economy. Khandwalla's (1986) definition of strategic organisations is that, they are:

Response of Chemolithotrophic Nitrobacter, Nitrosomonas to Toxicity of Organophoshphate and Pyrethroid Pesticides

Abstract: Aim: To investigate the response of Nitrosomonas and Nitrobacter species to organophosphate and pyrethroid pesticides. Study Design: This study employs experimental design and statistical analysis of data and interpretation. Place and Duration of Studies: Soil samples were obtained from University Farm, Rivers State University, Port Harcourt, Nigeria. Samples were transported to the microbiology laboratory of Rivers State University immediately for microbiological and toxicity testing. Pesticides was gotten No.4 Ignatius Ajuru University Road, St. John Campus, Aba Road Port Harcourt. The toxicity testing was done for the period of 28 days at room temperature. Methodology: Standard microbiological techniques were used: toxicity testing procedures were carried out by preparing a stock culture of the pesticide based on manufactures directions (8 ml into 1000 ml of distilled water) from which the concentrations used for this research work were obtained 0%, 3.125%, 6.25%, 12.5%, 25% and 50% and tested on the soil samples for a period of 28 days. Original Research Article Williams and Dilosi; AJOB, 7(1): 1-8, 2018; Article no.AJOB.45135 2 Samples were serially diluted and cultures were incubated at 35°C for 18 to 24 hours. LC50 was determined using SPSS version 2.0. Results: The results indicate that logarithm mortality of Nitrosomonas and Nitrobacter species increases with increase toxicant concentration and exposure time for pyrethroid pesticide while decreases with increase toxicant concentration and exposure time for organophosphate pesticides. The median lethal concentration LC50 of the pesticides increases in the following order: (Note: the higher the LC50, the lower the toxic effect); pyrethroid pesticide on Nitrosomonas (53.1%) < organophosphate pesticide on Nitrosomona (47.9%), pyrethroid pesticide on Nitrobacter (53.5%) < organophosphate pesticide on Nitrobacter (47.5%). Conclusion: The results revealed that different concentrations of the toxicants have both negative and positive effect on the survival rate of the test organisms which shows that the organophosphate pesticide can cause more harm to the environment affecting Nitrosomonas and Nitrobacter species that play vital functions in nutrient fixation in the soil environment. While pyrethroid pesticides at appropriate concentrations can stimulate the growth of these organisms there by increasing the rate of nutrient fixation in the soil environment. But also, when these toxicants are misapplied they can cause harm to humans that would consume the crops.