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ISOLATION AND CHARACTERIZATION OF BACTERIA FROM MECHANIC SITES.
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Table of contents
CHAPTER ONE: Introduction 1
1.1 Background to the Study 1
1.2 Statement of the Problem 4
1.3 Aim and Objectives 4
1.4 Objectives of the Study 5
CHAPTER TWO 6
2.0 Literature Review 6
2.1 Hydrocarbon Degradation 7
2.2 Petroleum Hydrocarbon-Degrading Bacteria 9
2.3 Toxic Impact of Petroleum Hydrocarbons 12
2.4 Factors Affecting Biodegradation of Hydrocarbon 14
CHAPTER THREE: Materials and Methods 17
3.1 Study Area 17
3.2 Sample Collection 17
3.3 Materials Used 17
3.4 Sterilization of Glass Wares and Other Materials 18
3.5 Preparation of Culture Media 18
3.6 Microbiological Analysis 18
3.7 Microbial Count and Pure Culture Isolation 19
3.8 Characterization and Identification of the Isolates 19
3.8.1 Gram Staining 19
3.8.2 Motility Test 20
3.8.3 Biochemical Test 20
3.8.3.1 Catalase Test 20
3.8.3.2 Starch Hydrolysis Test 20
3.8.3.3 Urease Test 21
3.8.3.4 Determination of Sugar Fermentation 21
3.8.3.5 Oxidase Test 22
CHAPTER FOUR: Results 23
CHAPTER FIVE: Discussion and Conclusion 28
5.1 Discussion 28
5.2 Conclusion 29
References 30
LIST OF TABLES
TABLE TITLE PAGES
4.1 Morphological Characteristics of Isolates Recovered from Mechanic Site Soil 24
4.2 Morphological Characteristics of Isolates Recovered from Mechanic Site Soil 25
4.3 Morphological Reaction of Isolates Recovered from Mechanic Site Soil 26
4.4 Percentage Occurrence of Bacteria Recovered from Mechanic Soil Sites 27
Abstract
Environmental pollution with petroleum and petrochemical products has been recognized as one of the most important serious current problem, especially in oil contaminated soil. The aim of this study was to isolate and characterize bacteria from mechanic sites in Ago-Iwoye, Ogun State, Nigeria. Composite soil samples was collected aseptically from 10 different mechanic workshops using a soil auger at 0-20cm depth and analysed for the presence of bacteria in Olabisi Onabanjo University Microbiology laboratory. The total bacteria count ranged from 6.5 x 102 to 12.0 x 104. Out of the twenty one (21) recovered bacteria isolates, sixteen (16) were Gram negative while five (5) were gram positive. The identify bacteria were Escherichia coli (n=8), Staphylococcus aureus (n=5), Pseudomonas aeruginosa (n=4), Klebsiella pneumoniae (n=3) and Serratia marcescens (n=1). Escherichia coli had the highest with 38.1%, followed by Staphylococcus aureus (23.8%), Pseudomonas aeruginosa (19%), Klebsiella pneumoniae (14.3%) while the least isolated bacteria is Serratia marcescens with 4.8%. This investigation provides information that would lead to selection of bacterial species that could be employed for bioremediation in environments polluted with used engine oil. It is therefore concluded that bacteria are abundant in mechanic sites soil.
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