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02 February 2021 | Story Dr Willemien Marais | Photo Supplied

The current issue of Communitas, academic journal of the Department of Communication Science in the Faculty of the Humanities at the University of the Free State (UFS), features scholarly articles ranging from indigenous knowledge systems for science and health communication to online discourses about male rape and the use of social media to increase social capital.  

Communitas is a nationally accredited, open-access academic journal publishing scientific articles in the context of community communication, information impact and related disciplines, including corporate and marketing communication, development and health communication, media studies, and journalism.

These articles address real-world challenges in the field of communication, as well as the impact of communication and information in developing societies, including Southern African communities. While the articles range in focus from global participation to area-specific issues in remote rural areas, they all highlight areas or aspects that form part of or contribute to the rich tapestry of the Southern African communication landscape, thus contributing to African knowledge creation.

Interdisciplinary experts write on real-world issues 

In the latest issue of Communitas, Dr Anton Binneman and Dr Corne Davis write about the use of indigenous knowledge systems for science communication in the context of the Square Kilometre Array radio astronomy project, while Lesego Radebe et al. investigate how traditional folk media can be used to convey diabetes mellitus messages at public health-care services. 

In an article by Dr Tsitsi Mkomde and Dr Estelle de Beer, nongovernmental organisations (NGOs) can benefit from their analysis of the communicative decision-making processes used by corporates to make decisions about funding NGOs and other donor recipients. In another NGO-related article, Prof Retha de la Harpe presents a conceptual model for NGOs and volunteer-based organisations to use data generated by an online platform to understand the invisible user.

For marketers and brand communicators, Dr Abyshey Nhedzi provides valuable insight into improving brand-linkage effectiveness for consumers from an African perspective, while Vuyelwa Constance Mashwa et al. focus on the consumer’s perspective in their article on the use of fictional spokes-characters in brand advertisements and communication. 

The increased focus on pro-environmental reputations by consumer brands and how this is reflected in South African print media, provides marketing-communication practitioners with guidelines to distinguish between types of green advertising, as identified by Prof Angelique van Niekerk and Dr Marthinus Conradie. Dr Patrick Mupambwa and Prof Norman Chiliya look at factors that influence the adoption of an e-marketing orientation among Zimbabwean churches. 

Heterosexual responses to lesbian and gay-themed advertisements are the focus of an article by Nkosiville Welcome Madigana et al., while Dr Karabo Sitto and Prof Elizabeth Lubinga analyse online discourses on gendered myths, risks, and the social amplification of male rape. 

With an increasing number of digital natives joining social media and the growing popularity of influencer culture, Dr Stenford Matenda et al. are looking at young people’s use of social media to increase social capital.  An article by Dr Mvuzo Ponono investigates the implications of current debates on fake news for South Africa and how we understand these insights in the context of histories of conflict and high inequality. Dr Ponono is a lecturer in Communication Science at the UFS. 

*Communitas uses a continuous publication (CP) model and authors are invited to submit manuscripts online or email the Editor-in-Chief, Dr Willemien Marais, at maraisw@ufs.ac.za for assistance. The journal is one of the accredited journals of the University of the Free State. Visit the Kovsie Journals webpage for more information. 

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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