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25 June 2019 | Story Leonie Bolleurs | Photo Barend Nagel
Marnus du Plooy
Marnus du Plooy, recipient of a Fulbright Scholarship, will depart for the Duke University in Durham, North Carolina, in August to complete a doctoral degree.

Marnus du Plooy will receive his master’s degree at the University of the Free State’s Winter Graduation Ceremony.

After completing his BSc degree in Microbiology, he discovered a passion for this field of research and enrolled for postgraduate studies in the Department of Microbial, Biochemical and Food Biotechnology at the UFS.

During his master’s, Du Plooy focused on the pathogenic yeasts, Cryptococcus neoformans and a related species, C. deneoformans.

Passion for science instilled at a young age

His passion for this field comes from a young age. “Both my parents were Science teachers and they instilled a love for Science in me. At school, I enjoyed the Science subjects the most and usually obtained my highest marks in these,” Du Plooy said. 

The pathogenic yeasts studied by Du Plooy, Cryptococcus neoformans and the sister species, C. deneoformans, often cause meningitis in immunocompromised individuals, such as in people living with HIV/Aids.

He pointed out: “Infection caused by these yeasts is right on the heels of TB as the second largest killer of HIV-positive patients in sub-Saharan Africa. The focus of my master’s project was to investigate new ways in which genes can be ‘switched off’ in these yeasts in order to study the role of the genes in virulence. Doing so could help to identify new drug targets for the treatment of this form of meningitis in subsequent studies.”

Expanding his international footprint

Although Du Plooy received his master’s degree from the UFS, he grabbed the opportunity to study abroad with both hands. He applied for and received a Fulbright scholarship from the Fulbright Foreign Student Programme, giving him the opportunity to study in the US.

“I did not expect to get very far with the application, as very few candidates are selected each year. I was very lucky to receive a Fulbright scholarship and an admission offer from Duke University for PhD studies in Microbiology,” said Du Plooy.

He hopes to continue with research on Cryptococcus and to contribute to improving the lives of HIV/Aids patients. “I have always been interested in pharmaceutical and medical research and noticed a need for better cryptococcal treatments, especially in sub-Saharan Africa. Cryptococcal meningitis is a neglected disease which claims more than 600 000 lives worldwide every year. The current treatment options are several decades old, with some only available in well-resourced areas.”

Du Plooy will depart for the US in August. “The duration of the degree is four to five years, where-after I will return to South Africa to apply what I have learned at home.”

News Archive

Research helps farmers save with irrigation
2017-02-15

Description: Irrigation research Tags: Irrigation research

Marcill Venter, lecturer in the Department of
Agricultural Economics at the University of the
Free State, has developed the mathematical
programming system, Soil Water Irrigation
Planning and Energy Management in order to
determine irrigation pump hours.
Photo: Rulanzen Martin

Her advice to farmers is that they should make sure they are aware of the total cost (investment and operating costs) of an irrigation system. In most cases the investment cost is low, but the operating cost over the lifetime of the system is high.

“It is very important to have a look at the total cost and to install the most economic system,” says Marcill Venter, lecturer at the University of the Free State (UFS), who has done research on the economic sustainability of water-pipe systems.

Irrigation systems important components for farming
This research comes at a time when many farmers are relying on their irrigation systems due to persistent drought and low rainfall during 2016. South Africa has also experienced an abnormal increase in electricity tariffs in recent years. Due to tariff increases which threaten the future profitability of irrigation producers, the Water Research Commission (WRC) has launched and financed a project on the sustainable management of irrigation farming systems. “I had the opportunity to work on the project as a researcher,” says Venter.

The heart of every irrigation system is the water pipes that bring life to crops and livestock, and this is what Venter’s research is about. “Water pipes are part of the whole design of irrigation systems. The design of the system impact certain factors which determine the investment and operating costs,” she says.

Mathematical system to help farmers
Venter and Professor Bennie Grové, also from the Department of Agricultural Economics at the UFS, designed the Soil Water Irrigation Planning and Energy Management (SWIP-E) programming model as part of the WRC’s project, as well as for her master’s degree. “The model determines irrigation pump hours through a daily groundwater budget, while also taking into account the time-of-use electricity tariff structure and change in kilowatt requirements arising from the main-line design,” says Venter. The model is a non-linear programming model programmed in General Algebraic Modeling System (GAMS).

Design of irrigation system important for sustainability

The main outcome of the study is that the time-of-use electricity tariff structure (Ruraflex) is always more profitable than the flat-rate structure (Landrate). The interaction between the management and design of a system is crucial, as it determines the investment and operating costs. Irrigation designers should take the investment and operating cost of a system into account during the design process. The standards set by the South African Irrigation Institute (SAII) should also be controlled and revised.

Water-pipe thickness plays major role in cost cuts
There is interaction between water-pipe thickness, investment and operating costs. When thinner water pipes are installed, it increases the friction in the system as well as the kilowatt usage. A high kilowatt increases the operating cost, but the use of thinner water pipes lowers the investment cost. Thicker water pipes therefore lower the friction and the kilowatt requirements, which leads to lower operating costs, but thicker pipes have a higher investment cost. “It is thus crucial to look at the total cost (operating and investment cost) when investing in a new system. Farmers should invest in the system with the lowest total cost,” says Venter.

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