Bücher von Emmanuel Tyokumbur

Scientific Study from the year 2023 in the subject Medicine - Other, grade: A, University of Ibadan, language: English, abstract: A study was carried out on the forensic entomotoxicological evaluation of carrion insects of rabbits euthanized with Acetonitrile between February and March, 2023, at the stadium of the University of Ibadan. The rabbits were obtained from The Teaching and Research farm, University of Ibadan, Oyo state. The rabbits were then euthanized with 10ml of Acetonitrile while the control group were scarified by cervical dislocation. Adult carrion insects were collected from the carrions using a sweep net and stored in 70% alcohol. The larvae were collected into a bowl by using a scoop, immobilized with hot water and later placed in sample bottles containing 70% alcohol. Pupae were also collected using forceps immobilized with hot water and later placed in sample bottles containing 70% alcohol. Ambient and carcass temperature was measured using infrared thermometer while relative humidity was recorded with a digital hygrometer. Calliphoridae and Muscidae were the initial pioneers of the decomposing carcass and were seen during the fresh stage, while Sarcophagidae arrived shortly after the fresh stage of decomposition. It was found that Calliphoridae was the most dominant carrion insect while Sarcophagidae was the least dominant among the pioneer. The control group had more abundance and species composition of carrion insects than the paraquat-poisoned rabbits. The length and weight of the larvae as indices of growth were also observed to be comparatively higher in the control than the 10ml acetonitrile rabbit. The highest mean temperature value for the decomposing 10ml Acetonitrile-treated rabbits was 31.90°C while its lowest mean value was 22.60°C. The highest mean relative humidity value was 99% while the least recorded was 42% due to the rainy season.Acetonitrile was found to retard the growth of carrion larva as shown in Musca domestica when compared with the control. Overall, rapid decomposition rate was recorded due to high ambient and carcass temperatures in the tropics. It can be deduced from this study that carrion insects are essential in providing the essential ecosystem service of decomposition and can be used in solving suicide puzzles through the extrication of post mortem intervals in conjunction with environmental variables. More studies are therefore needed to test the specific effects of other commonly used suicide poisons on carrion insects in Nigeria.

Scientific Essay from the year 2023 in the subject Psychology - Forensic Psychology and Penal System, grade: A, University of Ibadan, course: Zoology, language: English, abstract: A review essay is written on the forensic toxicology of selected suicide agents commonly used in developing countries. The essay discusses suicide, it causes and agents used to commit suicide. Four commonly used suicide agents in developing countries namely sniper, laundry bleaching agents, paraquat and gammalin are discussed under the headings: chemical composition, toxicity in animals and man, uses, regulations and control. The essay concludes on the need to regulate these suicide agents.Suicide is death caused by injuring oneself with the intent to die. A suicide attempt is when someone harms themselves with any intent to end their life, but they do not die as a result of their actions. Many factors can increase the risk for suicide or protect against it. Suicide is connected to other forms of injury and violence. For example, people who have experienced violence, including child abuse, bullying, or sexual violence have a higher suicide risk.Globally, approximately one million people kill themselves every year. The World Health Organization (WHO) has declared suicide a major global public health problem and called on member states to devise and implement national suicide prevention strategies. While suicide prevention is receiving increased attention in many developed countries, it remains largely ignored in developing countries, where a number of factors impede the implementation of successful preventive programmes.The issue of whether suicide can be a good death was separated into two different questions: (1) can suicide be an appropriate death, and (2) can suicide be a rational death? Several definitions of an "appropriate" death were proposed, and suicide was seen as potentially appropriate. Similarly, several criteria for rationality were proposed and suicide was seen as sometimes meeting these criteria. Thus, suicide can be sometimes conceptualized as a "good" death.

Research Paper (postgraduate) from the year 2023 in the subject Biology - Zoology, grade: A, University of Ibadan, course: Forensic Science and Zoology, language: English, abstract: The study was conducted on the forensic entomotoxicological evaluation of carrion insects from domestic fowls euthanized with dichlorvos (sniper) insecticide. The research centers on the collection and analysis of insects on the carrions and the impact of the insecticide on them.It entailed a forensic entomotoxicological evaluation between October and December 2019. The fowls for the study were procured from the main campus of the University of Ibadan. They were then euthanized using 3ml and 5ml of dichlorvos. The adult carrion insects were collected using a sweep net and stored in silica gel. Larvae and pupae were also collected and stored in sample bottles containing 70% ethanol. The temperatures of the environment and the carcasses were measured using an infrared thermometer, while the relative humidity was recorded from a digital hygrometer. The fly families Calliphoridae and Muscidae were the initial colonizers of the decomposing carcass, while Sarcophagidae arrived shortly after the fresh stage of decomposition.

Scientific Study from the year 2023 in the subject Biology - Zoology, grade: A, University of Ibadan, language: English, abstract: The aim of this study is to articulate and highlight the research on the forensic entomotoxicological evaluation of carrion insects found on rabbits euthanized with acetonitrile. Key findings, methods, and conclusions are to be presented.Two rabbits were used, one euthanized with acetonitrile and the other serving as a control experiment.

Project Report from the year 2015 in the subject Chemistry - Food Chemistry, grade: A, University of Ibadan, course: Zoology, language: English, abstract: This study was carried out on the evaluation of cadmium in chicken meat and offal in Bodija, Sango and Ojoo markets in Ibadan between July and October, 2015. The appraisal was aimed at assessing the cadmium that can be accumulated in the kidney, liver, intestine, blood, muscle and the feathers. Ten mature chickens were bought and dissected to remove the chicken meat and offal samples. This samples were oven-dried separately and pulverised into powdered form through grinding with a mortar and pestle. These were acid-digested for cadmium analyses using Buck Scientific 210 VGP Atomic Absorption Spectrophotometer. The results showed varying mean concentrations in the intestine (0.713±0.024 ppm), feather (0.702±0.035 ppm) and muscle (0.592±0.019 ppm) with low mean concentrations in the blood (0.426±0.032 ppm), liver (0.432±0.021 ppm) and kidney (0.352±0.027 ppm). Most of the chicken meat and offal samples were above the WHO guideline limit of 0.05 ppm. The Target Hazard Quotient (THQ) from the study was below 1 which is indicative that the general populace in this study area is not at risk. It is therefore recommended that regular biomonitoring should be carried out on chicken meat and offal locally and globally for the purpose of food safety.

Scientific Study from the year 2023 in the subject Chemistry - Food Chemistry, grade: A, University of Ibadan, language: English, abstract: A study was carried out on the forensic entomotoxicological evaluation of carrion insects of fishes poisoned with dichlorvos on the main campus of the University of Ibadan. Fishes (Clarias gariepinus) for the study were obtained from the fish farm on the University Campus. The fishes were then euthanized with 5ml of dichlorvos while the control was without poison. Adult carrion insects were collected from the fish carrion using a sweep net. The larvae were collected into a bowl by using a scoop, immobilized with hot water and later placed in sample bottles containing 70% ethanol. Pupae were collected using forceps. Carcass temperature was measured using infrared thermometer while relative humidity was recorded from a digital hygrometer. Calliphoridae and Muscidae were the initial pioneers of the decomposing carcass and were seen during the fresh stage, sarcophagidae was seen shortly after the fresh stage of decomposition. The highest mean temperature value for the fish treated with 5ml Dichlorvos was 31.30C while its lowest mean value was 22.60C. It was observed that the temperature on the ninth day was higher than the other days. This is attributed to the heat generated by the active maggots at that stage of decomposition. Dichlorvos was found to retard the growth of carrion larva as shown in Musca domestica larvae when compared with the control. Fast decomposition rate was recorded due to high ambient and carcass temperature. It can be concluded from this study that carrion insects can be used in solving crime puzzles through the extrication of post mortem intervals in conjunction with environmental variables. Since fish carrion in this study attracted a sizable number of carrion insects, it is recommended that fish be used in future forensic case and experimental studies.

Scientific Study from the year 2020 in the subject Biology - Micro- and Molecular Biology, grade: A, University of Ibadan, course: Biology, language: English, abstract: A study was carried out on the forensic entomological evaluation of carrion insects of pigs poisoned with paraquat between July and September 2018, on the main campus of the University of Ibadan. Paraquat is a commonly used suicide agent because it is easily available and very cheap. Pigs for the study were obtained from Akinyele meat market in Ibadan, Oyo state. The pigs were then weighed and euthanized with 60ml and 80ml of paraquat while the third pig without poison served as the control. Adult carrion insects were collected from the carrions using a sweep net and they are then immobilized using by spraying them with insecticide. The larva were collected into a bowl by using a spoon. The larvae were then immobilized with hot water and are later placed in appropriate sample bottles. Pupae were collected using a forces.

Scientific Study from the year 2023 in the subject Biology - Micro- and Molecular Biology, grade: A, University of Ibadan, language: English, abstract: The primary objective of this study is to examine the entomotoxicological impacts of paraquat dichloride herbicide on carrion insects in a forensic context. Conducted at the University of Ibadan, Nigeria, the research explored the effect of paraquat on rabbit carcasses and the associated carrion insect populations. Dominant insect families were Calliphoridae and Muscidae, with Sarcophagidae also present but less dominant.

Scientific Study from the year 2023 in the subject Biology - Micro- and Molecular Biology, grade: A, University of Ibadan, language: English, abstract: This thesis wants to develop an understanding of the effects of Gammalin-20 on forensically relevant insect species found on poisoned rabbit carrion, and their changes in abundance, rate of development, and succession order.In a study conducted at the University of Ibadan, the entomotoxicological appraisal of carrion insects found on rabbits poisoned with Gammalin-20 was carried out. Two rabbits were used as surrogate human models, with one euthanized with Gammalin-20 and the other serving as a control. The flies and larvae found on the carcasses were collected and stored in alcohol. It was found that Calliphoridae were the most dominant carrion insects, while Sarcophagidae were less dominant. The control group had a greater diversity and species composition of carrion insects compared to the Gammalin-20 poisoned rabbits. Growth indicators like length and weight of the larvae were also comparatively higher in the control group. Temperature and humidity measurements were also conducted. The effects of the poison on the developmental and succession patterns of the insects were also examined.

Project Report from the year 2015 in the subject Chemistry - Food Chemistry, grade: A, University of Ibadan, course: Zoology, language: English, abstract: A study was carried out on the assessment of lead in the organs and tissues of domestic chicken (Gallus gallus domesticus) in Ibadan from August to September 2015. Ten (10) chickens (layers and broilers) expressed as samples 1-10 were purchased from different retailer markets (Bodija, Ojoo and Sango) within Ibadan City. The chickens were dissected to remove the intestine, liver, kidney, blood, feathers and muscles were oven-dried at 220 degree Celsius. The pulverized organ and tissues samples were acid-digested and analyzed for the heavy metal lead (Pb) using Buck Scientific Atomic Absorption Spectrophotometer (AAS). The results showed that the highest Pb concentrations in parts per million (ppm) were recorded in the liver (2.940+0.040), intestine (3.9800+0.500), kidney(3.6600+0.6000), feather (3.5900+0.06000), and muscle (3.400+0.4000) in sample 10, while the lowest concentration was recorded in the kidney (0.150+0.0300) in sample 1 all at Bodija Market . Analysis of Variance (ANOVA) revealed significance of the Pb metal in the organs and tissues of chickens at P< 0.05. Less than half of the samples had Pb concentration that exceeded the permissible limit of 0.1ppm set by FAO/WHO. The study shows that meat from the chicken organs and tissues in Ibadan are relatively safe for human consumption. There is need for regular biomonitoring of heavy metals in chicken meat and offal globally.

Scientific Study from the year 2023 in the subject Biology - Miscellaneous, grade: A, University of Ibadan, language: English, abstract: Forensic entomotoxicological appraisal of carrion insects found on pigs poisoned with Gammalin-20 was carried out at the back of the stadium on the campus of the University of Ibadan. A total of three 3-month old domestic pigs, Sus scrofa L., weighing between 10.5 and 11.3 kg were used as surrogate human models. Two pigs were euthanized with Gammalin-20 by administering 180 ml and 200 ml separately, while the third one was sacrificed without any poison and served as the control experiment. After death was confirmed, each pig was immediately mounted on sawdust and setup at about 50 m apart to allow for arthropod colonization without cross migration, thereby representing three different replicates of the same study. The pigs were left to decompose, and it was discovered that there were five phases of decomposition namely: fresh, bloated, active, advanced and dry decay stages. The decomposition process of the carrions took twenty days in the control experiment and thirty-four days in those treated with Gammalin-20. Four families of flies were found (Calliphoridae, Sarcophagidae, Muscidae and Dermestidae) and seven species (Chrysomya abiceps, Chrysomya regalis, Sarcophaga spp, Phormia regina, Lucilia sericata, Dermestes maculatus and Musca domestica). Their activities on the carrions included consumption of the carrion tissues and using same to propagate their progeny. Calliphoridae was observed to be the most dominant family in nearly all the stages of decomposition with 108 individuals, followed by the Sarcophagidae with 98 individuals, the Muscidae with 85 individuals and the Dermestidae with 10 individuals. Flies found on the carrions were collected with a sweep net and preserved in 70% ethanol for identification. The succession pattern of the flies, their abundance, rate of development, effects of the poison on the developmental pattern were all determined. Warning: Contains images of dead and decomposing animals (pp. 41-45).