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18 May 2022 | Story Rulanzen Martin | Photo Supplied
Jon Kehrer
Jon Kehrer is a prolific academic and scholar. He also spent a few years teaching English in the Middle East.

It was a former professor who influenced American scholar Jon Kehrer to further his academic journey with the Department of Hebrew at the University of the Free State (UFS). And it was at the UFS where he recently graduated cum laude with a master’s degree in Hebrew, and was named recipient of the Dean’s Medal. 

Although he never expected to receive the Dean’s Medal, he is very glad – and somewhat relieved – that his dissertation made it through the examiners. “I never anticipated receiving this award. It makes me even more grateful for the strong Hebrew Department at UFS, and their rigorous standards for their students,” Kehrer says. 

“I wish I had been able to attend the graduation ceremony, but the circumstances of the semester just did not allow it.” Kehrer is currently teaching in the areas of the Old Testament and Biblical Languages at the Ozark Christian College (OCC) in Missouri, USA. In addition to his UFS qualifications Kehrer also holds a Bachelor of Theology qualification from the OCC. “I love the opportunity to invest in students and help them see new perspectives,” he says. 

UFS Hebrew a firm foundation for a solid academic career  

“I was looking for a high-quality and challenging programme that was flexible, especially since I work full-time and have a large family,” Kehrer says, as he recalls how he initially decided to become part of the UFS. He remembers fondly how Dr Kevin Chau, senior lecturer in Hebrew at the UFS, motivated and supported him when he first enrolled for the BA Honours programme. 

It is also a testament that the Department of Hebrew has made an impact internationally for the quality of its academic offerings. “Dr Chau helped me to think about how what I was learning would have an impact on my research and teaching in the future, and he was always quick to provide thorough and constructive feedback on my work,” Kehrer says.  

Once enrolled for the master’s programme it was initially difficult to know which direction to pursue and what topic to research, but the guidance and support of his two advisors, Prof Cynthia Miller-Naude and Prof Jacobus Naude, was “very helpful”.

“They never dictated what paths I should pursue, but they listened carefully and provided expert guidance to help me choose the path that would best suit my interests and the needs of the field,” he says. 

It was this support from the Department of Hebrew and its excellent reputation that came full circle when Kehrer was named Dean’s Medal recipient for achieving the highest marks of any student in a master’s qualification in the UFS Faculty of The Humanities. 

Dissertation a closer look at verbs in Biblical Hebrew 

His dissertation focused on Biblical Hebrew and how the object of a verb appears in various ways. “Sometimes an object appears by itself, but sometimes it can have a preposition or a two-consonant Biblical Hebrew particle along with it. Many Bible translations treat all these objects the same,” he says. “I wanted to try to understand why these variations occurred, so I looked at how different sentence elements might contribute to the variation. It was a fascinating study!” 
 
Kehrer believes it is important for university students to continue studying classical subjects like Hebrew. “I think we can all learn much from those who have gone before us, and so much wisdom and insight is connected to these ancient Biblical Hebrew texts, texts that would be inaccessible to us without translation,” he says. 

“I also think classical disciplines can help train students to think well and to read critically – essential skills for living in today’s ever-changing world.”  

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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