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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

Dr Charlotte Boucher and Lindi Heyns examine possible anti-microbial activity in the skin of Western olive toad species
2014-12-22

 

Researchers Lindi Heyns and Dr Charlotte Boucher are working together on an interdisciplinary project between the Departments of Zoology and Entomology and Veterinary Biotechnology at the University of the Free State (UFS). The focus of their research is on the preliminary biochemical description of skin secretions in some South African toads.

The project forms part of an Honours study executed by Dwayne Pike under Heyns’ supervision. He is co-supervised by Dr Boucher who is assisting with the biochemical and microbiological assays.

Dr Boucher said, “Amphibians are characterised by the presence of cutaneous glands spread over the skin. There are two types of glands, namely mucous and granular (poison), located on the inner surface of the epidermis. Mucous glands are widely dispersed over the skin, while granular glands can be grouped and enlarged in specific regions. Mucous glands are generally associated with maintenance of humidity and cutaneous respiration, whereas granular glands function in chemical defence against predators and/or microbial infection. Studies indicate that the compounds produced by the granular glands belong to numerous chemical classes with diverse pharmacological activities.”

The products secreted by granular glands are rich in low molecular weight constituents of varied molecular types, including proteins, peptides and toxins. These secretions make the toad foul-tasting to predators and even toxic to other frog species. In addition, amphibians offer an attractive source of novel antimicrobials. Studies indicate that as a response to inhabiting microorganism-rich environments they synthesise and secrete a diverse array of antimicrobial peptides (AMPs) as an innate form of defence. Extensive research by various other research groups has been carried out on antimicrobial peptides of the genus Rana; however, hardly any studies have investigated the antimicrobial activity of African frog species.

The focus of this preliminary project is to determine the protein composition of the glandular secretions of the Western olive toad (Amietophrynus poweri), using biochemical tests, such as SDS-PAGE also known as protein gel electrophoresis combined with mass-spectrometry used to identify unknown peptides and proteins. This will give us an overview of the composition of the glandular secretions. Furthermore, we are also looking at microbiological tests, which include assays that test for possible anti-microbial activity against various bacterial and fungal species.

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