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21 April 2023 | Story EDZANI NEPHALELA | Photo CHARL DEVENISH
Magdalene de Koker
Magdalena de Koker accepts a posthumous degree on behalf of her late son, Mervin Hershel van Wyk.

A grieving mother brought tears to the eyes of almost everyone present during a graduation ceremony at the University of the Free State (UFS) on Thursday 20 April, when she took to the stage to accept her late son’s posthumously awarded master’s degree.

The usually festive and jovial graduation spirit inside the Callie Human Centre at the University of the Free State’s Bloemfontein Campus turned sombre in a matter of seconds as Magdalena de Koker ascended the stage to receive her son Mervin Hershel van Wyk’s degree. The Faculty of Theology and Religion student had been on track to receive a Master of Theology degree with a specialisation in Church History and Polity, but passed away before his graduation ceremony. The posthumous degree awarding honoured Van Wyk’s memory and acknowledged his family’s support throughout his academic journey.

“My emotions are conflicted,” De Koker said. “I feel a sense of pride for my son’s accomplishments, and eagerly anticipated celebrating his graduation. However, the profound loss of my son has left me devastated. Instead of being a spectator, cheering him on from the audience, I now find myself standing in his place on stage, wearing unfamiliar shoes, unsure where the toe or heel lies.” 

His legacy lives on

Before closing the ceremony Professor Bonang Mohale, Chancellor of the UFS, said he cried because this degree had to be conferred posthumously. 

“This is sad, tragic, and regrettable,” Prof Mohale said. “We all pray and hope that our children will bury us. Mama, we pray that you get peace by acknowledging the current trauma and pain, so that there can be some acceptance in order to start the process of healing. And with that process of healing comes forgiveness. The wonderful thing about forgiveness is that it allows more healing. May the good Jehovah be with the family and the whole clan. When we pray, we say ‘Thy will be done’. Thank you, in the wake of your pain, for making the time to be with this greater family of Kovsies.” 

Dr Eugene Fortein, Senior Lecturer in Church History and Polity, said his late student was an inspiration to many. “He firmly believed that God cared about the suffering of the impoverished and oppressed, and that justice would be served to those often overlooked. These convictions fuelled his involvement in politics, unafraid to use his Christian beliefs to advocate for change through protests. His trial sermon last year from Amos 5 – ‘But let justice roll on like a river, righteousness like a never-failing stream’ – embodied his unwavering conviction that justice and righteousness were integral to his faith.” 

Van Wyk’s passing is huge a loss for his family, friends, and the UFS and South African academic communities. His dedication and commitment to his studies serve as an inspiration to all those who knew him. The UFS community mourns the loss of a talented student and scholar, but his legacy will continue to live on through his contributions to the field of theology.

News Archive

Research eradicates bacteria from avocado facility
2017-01-17

 Description: Listeria monocytogenes Tags: Listeria monocytogenes

Listeria monocytogenes as seen under an electron
microscope. The photo was taken with a transmission
electron microscope at the microscopy unit of the UFS.
Bacteriophages (lollipop-like structures) can be seen
next to the bacterial cells.
Photo: Supplied

“The aim of my project was to identify and characterise the contamination problem in an avocado-processing facility and then to find a solution,” said Dr Amy Strydom, postdoctoral fellow in the Department of Microbial Biochemical and Food Biotechnology at the University of the Free State (UFS).

Her PhD, “Control of Listeria monocytogenes in an Avocado-processing Facility”, aimed to identify and characterise the contamination problem in a facility where avocados were processed into guacamole. Dr Strydom completed her MSc in food science in 2009 at Stellenbosch University and this was the catalyst for her starting her PhD in microbiology in 2012 at the UFS. The research was conducted over a period of four years and she graduated in 2016. The research project was funded by the National Research Foundation.

The opportunity to work closely with the food industry further motivated Dr Strydom to conduct her research. The research has made a significant contribution to a food producer (avocado facility) that will sell products that are not contaminated with any pathogens. The public will then buy food that is safe for human consumption.


What is Listeria monocytogenes?

Listeria monocytogenes is a food-borne pathogenic bacterium. When a food product is contaminated with L. monocytogenes, it will not be altered in ways that are obvious to the consumer, such as taste and smell. When ingested, however, it can cause a wide range of illnesses in people with impaired immune systems. “Risk groups include newborn babies, the elderly, and people suffering from diseases that weaken their immune systems,” Dr Strydom said. The processing adjustments based on her findings resulted in decreased numbers of Listeria in the facility.

The bacteria can also survive and grow at refrigeration temperatures, making them dangerous food pathogens, organisms which can cause illnesses [in humans]. Dr Strydom worked closely with the facility and developed an in-house monitoring system by means of which the facility could test their products and the processing environment. She also evaluated bacteriophages as a biological control agent in the processing facility. Bacteriophages are viruses that can only infect specific strains of bacteria. Despite bacteriophage products specifically intended for the use of controlling L. monocytogenes being commercially available in the food industry, Dr Strydom found that only 26% of the L. monocytogenes population in the facility was destroyed by the ListexP100TM product. “I concluded that the genetic diversity of the bacteria in the facility was too high and that the bacteriophages could not be used as a control measure. However, there is much we do not understand about bacteriophages, and with a few adjustments, we might be able to use them in the food industry.”

Microbiological and molecular characterisation of L. monocytogenes

The bacteria were isolated and purified using basic microbiological culturing. Characterisation was done based on specific genes present in the bacterial genome. “I amplified these genes with polymerase chain reaction (PCR), using various primers targeting these specific genes,” Dr Strydom said. Some amplification results were analysed with a subsequent restriction digestion where the genes were cut in specific areas with enzymes to create fragments. The lengths of these fragments can be used to differentiate between strains. “I also compared the whole genomes of some of the bacterial strains.” The bacteriophages were then isolated from waste water samples at the facility using the isolated bacterial strains. “However, I was not able to isolate a bacteriophage that could infect the bacteria in the facility.

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