Show Notes
Matters Microbial #98: Nesting Dolls of Endosymbiosis July 3, 2025 Today, Dr. John McCutcheon of Arizona State University joins the #QualityQuorum to discuss the work he and his research group do to investigate the strategies by which microbes become symbionts of other cells. After all, the mitochondria and chloroplasts of eukaryotic cells, including yours, were once bacteria! Host: Mark O. Martin Guest: John McCutcheon Subscribe: Apple Podcasts, Spotify Become a patron of Matters Microbial! Links for this episode A video about the symbiosis of Hydra virdissima, which captured my heart when I was young. Look at those symbiotic algae! Here is an overview of this topic. A video describing the Rhizobium – legume nitrogen fixing symbiosis in all of its glory—by my PhD advisor, the great Dr. Sharon Long. Here is an overview of this topic. An appreciation of Paul Buchner's very important book, "Endosymbiosis of Animals with Plant Microorganisms." A wonderful review by Dr. McCutcheon on how symbioses form. A wonderful essay by Ed Yong about an event that made eukaryotic cells possible: how bacteria became mitochondria. A story about an anaerobic protist that lost its mitochondria completely. A bacterial symbiont of mitochondria, the "midichlorian." The recent discovery of a new integrated symbiont that has become an organelle, the nitrosome. The "X-bacteria" and amoebae story. A retrospective on endosymbiosis, and Paramecium based on Tracey Sonneborn's work. An essay on aphids and bacteria. An article on the Moranella/Tremblaya symbiosis. An article on "bacteria inside other bacteria" found in several symbioses, written by Dr.McCutcheon and colleagues. Genomic instability in bacterial endosymbionts. An article on cicadas and bacterial endosymbionts from Dr. McCutcheon and colleagues. An article on mealybugs and bacterial endosymbionts from Dr. McCutcheon and colleagues. Dr. McCutcheon's thoughts on his career path (so worth reading). The Center for Mechanisms of Evolution research institute in which Dr. McCutcheon works. Dr. McCutcheon's faculty website. Dr. McCutcheon's (and his research team's) wonderful research website. Intro music is by Reber Clark Send your questions and comments to [email protected]
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Matters Microbial #141: How Tardigrades Survive What We Do To Them October 20, 2026 Today Dr. Molly Jane Kirk, postdoctoral scholar in the Department of Molecular, Cellular, and Developmental Biology at UC Santa Barbara, joins the quality quorum to discuss her research fascination with the biology and resilience of a microscopic multicellular eukaryote, the famous tardigrade.
Matters Microbial #140: Out of Many, One — Coral and Jellyfish Holobionts October 7, 2026 Today Dr. Monica Medina, Professor in the Department of Ecology and Evolutionary Biology at UCLA, joins the quality quorum to discuss how organisms are made up of myriad other organisms—the holonbiont concept. Dr. Medina and her research group focus on studying this in jellyfish and coral.
Matters Microbial #139: How Listeria Gets By With a Little Help From Its Friends September 23, 2026 Today Dr. Jasna Kovac, Huck Chair in Microbiomes in Food Safety and Associate Professor of Food Science at Penn State University (and active member of Penn State's One Health Microbiome Center) joins the quality quorum to discuss how understanding the microbiome in food processing facilities can help reduce the incidence of food borne illnesses, including Listeria. Host: Mark O. Martin Guest: Jasna Kovac Subscribe: Apple Podcasts, Spotify Become a patron of Matters Microbial! Links for this episode Here is an overview of Listeria as a microbe. Here is an overview of Listeria pathogenesis. A video showing "actin rockets" moving Listeria around inside of a eukaryotic cell. Overview from the CDC regarding Listeria. Prior #MattersMicrobial podcast about Listeria by Dr. Lisa Gorski. An overview of microbial food safety issues. Description of the cantaloupe associated Listeria outbreak. Description of the caramel apple Listeria outbreak. An overview of whole genome sequencing as a diagnostic tool. A video description of MIC (minimal inhibitory concentration) relationship between microbes and antimicrobials. An overview of biofilms. A prior #MattersMicrobial podcast about biofilms with Dr. Matthew Fields. The One Health Concept linking many aspects of everyday life to microbiology. A description of Sanger 16S rRNA sequencing. An overview of MPN (most probably number) analysis in microbiology. A video describing the very useful LIVE/DEAD dye approach in microbiology. Microbiology and sanitizers. An overview of EPS (extracellular polysaccharides). Description of SNPs (single nucleotide polymorphisms). An overview of the lineages of Listeria. A description of Dr. Kovac's approach to precision food safety. A nice description of Dr. Kovac's evaluation of tree fruit processing plants described in this podcast. A wonderful video presentation by Dr. Kovac. Dr. Kovac's academic website. The research laboratory website for Dr. Kovac and colleagues. Intro music is by Reber Clark Send your questions and comments to [email protected]
Matters Microbial #138: Sightseeing the Microbial World September 8, 2026 Today Dr. Monika Oli, Instructional Professor of the Department of Microbiology and Cell Science at the University of Florida joins the quality quorum to discuss how she teaches microbiology students to view the topic through a global lens as a study abroad program. Her approach demonstrates how travel enriches scientific understanding, broadens cultural perspectives, and prepares students to become globally engaged microbiologists equipped to address the challenges of an interconnected world.
Matters Microbial #137: The Living Skin of Our Planet August 25, 2026 Today Dr. Estelle Couradeau, Assistant Professor in the Department of Ecosystem Science and Management and the Huck Institutes of the Life Sciences at the Pennsylvania State University, joins the quality quorum today to discuss the role that the soil microbiome can play in terms of agriculture, moderating temperature, and protecting specific environments.