A Smart-bin prototype for in-house waste management

Thesis submitted in partial fulfillment of the requirements for the Degree of Master of Science in Information Technology (MSIT) at Strathmore UniversityA healthy environment is imperative to a healthy and happy community. Clean and well monitored environments are a key need in human habitable environments. In-House management and monitoring of waste is a key aspect in achieving this. The existing system of using waste monitoring personnel to regularly check and empty filled dustbins, the process has been prone to delays or neglect. Additionally, due to different frequency of usage of dustbins in different areas, routine checks which are based on time crevices is inefficient because a dustbin might get filled early and may need immediate attention or there might not be any need of a routine check for a long period of time. This makes present system resource expensive and ineffectual, as overflowing, stinking dustbins become more of a problem than a solution. This study presents a solution about the Smart-Bin Prototype for In-House Waste Management which integrates the idea of IoT with Wireless Sensor Networks. Arduino ATmega328P Microcontroller is used to interface the sensor system and the IoT hub. Dustbins in an area are embedded with low power and low cost smart ultrasonic and gas sensors that are connected to an IoT device, which acts as a central hub for all bins. The bins transmit their gas content and its fill-level status to the central hub which relays this data to a cloud platform. The cloud platform further pushes the data to the client app a GUI (Web or mobile) in which the current gas content and their state (filled or not) is displayed. The client app GUI can be used by the waste management personnel and data can be used to plan their routine check. This timely garbage monitoring would optimize resources, reduce cases of neglect and is easy to adopt

The role of the whitefly, Bemisia tabaci (Gennadius), and farmer practices in the spread of cassava brown streak ipomoviruses

Cassava brown streak disease (CBSD) is arguably the most dangerous current threat to cassava, which is Africa's most important food security crop. CBSD is caused by two RNA viruses: Cassava brown streak virus (CBSV) and Ugandan cassava brown streak virus (UCBSV). The roles of the whitefly Bemisia tabaci (Gennadius) and farmer practices in the spread of CBSD were investigated in a set of field and laboratory experiments. The virus was acquired and transmitted by B. tabaci within a short time (5–10 min each for virus acquisition and inoculation), and was retained for up to 48 hr. Highest virus transmission (60%) was achieved using 20–25 suspected viruliferous whiteflies per plant that were given acquisition and inoculation periods of 24 and 48 hr, respectively. Experiments mimicking the agronomic practices of cassava leaf picking or the use of contaminated tools for making cassava stem cuttings did not show the transmission of CBSV or UCBSV. Screenhouse and field experiments in Tanzania showed that the spread of CBSD next to spreader rows was high, and that the rate of spread decreased with increasing distance from the source of inoculum. The disease spread in the field up to a maximum of 17 m in a cropping season. These results collectively confirm that CBSV and UCBSV are transmitted by B. tabaci semipersistently, but for only short distances in the field. This implies that spread over longer distances is due to movements of infected stem cuttings used for planting material. These findings have important implications for developing appropriate management strategies for CBSD

Dietary Impact on Antibiotic Resistance in Feedlot Manure

There is a growing public concern regarding antibiotic resistance and the use of antibiotics, including in livestock management. Understanding the ecology of antibiotic resistance among microbes, identifying resistance gene reservoirs, and implementing antibiotic resistance mitigation practices in livestock production are critical to protecting animal and human health while meeting increasing food demands. This research is one of several studies seeking to assess risk for livestock- to- human transfer of antibiotic resistance and to identify mechanisms for reducing that risk where possible. This study evaluated the impact of forage concentration and supplemental essential oil in beef cattle finishing diets on antibiotic resistance in freshly excreted and consolidated beef feedlot manure. Results indicate that antibiotic resistance in manure was not impacted by either of the two dietary treatments considered

Effects of Lime Amendment on Antibiotic Resistance in Beef Cattle Manure of Open Feedlots

The objective of this study was to evaluate the effectiveness of lime amendment on the reduction of antimicrobial resistant bacteria and antimicrobial resistance genes in beef cattle manure in open feedlots. Hydrated lime was uniformly applied to the surface of feedlot pen floor 1 day prior to cattle harvest at a rate of 0.36 lb/ft2 and samples were collected over time. Collected samples were analyzed for change in pH and levels of antimicrobial resistant bacteria and antimicrobial resistance genes. Lime amendment elevated the pH of pen floor surface materials to pH \u3e 12 for 4 hours and then pH \u3e 11 for another 24 hours. Lime amendment reduced the concentration of generic and resistant Escherichia coli by 1–2 log for up to 4 hours. The abundance of antimicrobial resistance genes, such as tet(X) and tet(O), decreased by 1–2 order of magnitude with lime amendment. Results indicate that lime addition reduced the concentrations of antimicrobial resistant bacteria and antimicrobial resistance genes in pen surface materials from open beef feedlot pens

Resistome and mobilome in surface runoff from manured soil as affected by setback distance

Land application of livestock manure introduces antibiotic resistance genes (ARGs) and mobile genetic elements (MGEs) into the soil environment. The objectives of this study were to examine the changes of resistome and mobilome in runoff and soil as a function of setback distance, i.e., the distance between manured soil and surface water, and to quantify the contributions of manure and background soil to the ARGs and MGEs in surface runoff. The resistome and mobilome in runoff and soil from a field-scale plot study were characterized using a high throughput quantitative polymerase chain reaction (HT-qPCR) array. It was estimated that a setback distance of ~40 m is required to reduce the total abundance of ARGs and MGEs in runoff from amended plots to that in control runoff. The resistome and mobilome of the soil in the setback region was not affected by manure-borne ARGs and MGEs. SourceTracker analyses revealed that background soil gradually became the predominant source of the ARGs and MGEs in runoff as setback distance increased. The results demonstrate how manure-borne ARGs and MGEs dissipated in agricultural runoff with increasing setback distance and had limited impacts on the resistome and mobilome of soil within the setback region

Cassava brown streak disease: historical timeline, current knowledge and future prospects

Cassava is the second most important staple food crop in terms of per capita calories consumed in Africa and holds potential for climate change adaptation. Unfortunately, productivity in East and Central Africa is severely constrained by two viral diseases: cassava mosaic disease (CMD) and cassava brown streak disease (CBSD). CBSD was first reported in 1936 from northeast Tanzania. For approximately seventy years CBSD was restricted to coastal East Africa and so had a relatively low impact on food security compared to CMD. However, at the turn of the 21st century CBSD re-emerged further inland, in areas around Lake Victoria and it has since spread through many East and Central African countries, causing high yield losses and jeopardising the food security of subsistence farmers. This recent re-emergence has attracted intense scientific interest, with studies shedding light on CBSD viral epidemiology, sequence diversity, host interactions and potential sources of resistance within the cassava genome. This review reflects on 80 years of CBSD research history (1936 – 2016) with a timeline of key events. We provide insights into current CBSD knowledge, management efforts and future prospects for improved understanding needed to underpin effective control and mitigation of impacts on food security

Global warming discourse and the economic dilemma of sustainability : the potential contribution of African ethics.

Thesis (M.A.)-University of KwaZulu-Natal, Pietermaritzburg, 2013.This paper focuses on the possible input of African Ethics into the global warming and climate change discourse in light of the economic dilemma of sustainability. The paper argues that African Ethics through its concept of Ubuntu can make a worthy contribution to the issues surrounding sustainable development, ecological debt and international climate change talks. In a world where the lives of the affluent nations impact drastically on our climate and necessitate calamitous climate disasters and cause the poor to suffer, why is it that the international community has not reached any noteworthy climate change solutions? The same poor countries are also burdened by payment of huge debts and poor climate change adaptation and development. Can African ethics make some contribution to these challenging issues brought by global warming and climate change? The dissertation seeks to tackle these questions by employing a qualitative methodology informed by Gadamer’s philosophical hermeneutics and using the research design of Boff’s ecological holism and Murove’s relational paradigm. However, in order for African ethics to make such a viable contribution the paper seeks to reveal the philosophical and economic substrata sustaining the incessant degradation of the ecology. This opens us the entry point for African ethics through Ubuntu to engage with other voices in the search for solutions to the global warming and climate change crises

Vinyatsi Mjila (Grass on the road)

"Much grass on the road, take it all. When we walk we get tired of too much grass on the road." It is not easy to walk on dry grass as it is to slippery and the feet slip backwards and make you tired. The old player reflects a portion of country commonplace truth in this repetative little song. Humorous song with one string lute, Karigo