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Meet the Microbiologist

Meet the Microbiologist is a podcast that showcases the people behind the scientific discoveries. Each guest introduces their research in one of the cutting-edge areas of the microbial sciences: genomics, antibiotic resistance, synthetic biology, emerging infectious diseases, microbial ecology, public health, probiotics, and more! You no longer have to suffer in silence: learn about epidemiology as you run errands, explore drug discovery as you drive home, delve into microbial genomics at the gym. Each guest discusses their scientific discoveries and where future technologies may lead. Meet the Microbiologist, hosted by Julie Wolf, was previously titled Meet the Scientist, hosted by Merry Buckley and Carl Zimmer.

levy

If you or someone you care about has ever had an antibiotic resistant infection, you know how dire that situation can be.  Stuart Levy, a professor of microbiology at Tufts University in Boston, has centered his research around the theme of antibiotic resistance and he says there are few antibiotics in the pipeline for use on that inevitable day when our current infection-fighters are finally overcome.  Dr. Levy is delivering the keynote address at ASM’s Biodefense and Emerging Diseases Research Meeting in Baltimore in February.

Antibiotic resistance may not be making big headlines these days, but that’s not because the threat is any less serious than before.  Levy says he first became interested in antibiotics as a child, when he watched a course of antibiotics heal his twin brother, who suffered from an infection.  Later, as a researcher at the Pasteur Institute in Paris, France, he learned that bacteria can swap around the ability to resist antibiotics, and that failing to manage a small problem with resistance can have some serious consequences down the line.

In this interview, I talked with Dr. Levy about his talk at the biodefense meeting, what antibiotic resistance has to do with biosecurity, and about why you should leave those bottles of antimicrobial soap on the shelves at the store.

Direct download .mp3

paul-keim

Dr. Paul Keim is a professor of biological sciences at Northern Arizona University, in Flagstaff, where his research program focuses on microbial forensics and the genomic analysis of pathogenic bacteria.  As an expert in Bacillus anthracis, the bacterium responsible for anthrax, Dr. Keim participated in the FBI’s investigation into the anthrax letter attacks back in 2001.

Microbial forensics is a field that developed in response to the twin threats of biological warfare and biological terrorism.  (What’s the difference between biological warfare and biological terrorism?  Both have the potential to reach beyond the site of the attack and both are a menace to innocent, unarmed citizens.  To me, there’s a fine line here.  But I digress.)

Dr. Keim’s interest in microbial forensics arose out of his postdoctoral work at the University of Utah.  After this training in phage recombination and genomics, Dr. Keim applied what he had learned about bacterial genetics in a collaboration with scientists working on resolving and identifying the various strains of B. anthracis.  Fast forward to this past summer, when the F.B.I. revealed that Dr. Keim used his expertise on B. anthracis to help in the investigation that concluded a researcher at the U.S. Army Medical Research Institute of Infectious Diseases (USAMRIID) perpetrated the anthrax attacks.  Dr. Keim, along with several other scientists who helped in the F.B.I.’s

investigation, will be speaking at ASM’s Biodefense and Emerging Diseases Research Meeting in Baltimore in February, where they’ll present the facts about their contributions to the criminal investigation.

In this podcast, I talked with Dr. Keim about his work with the F.B.I., whether the payoffs of bioterrorism research are worth the costs, and about how the plague (yes, the Black Death) made its way to North American shores and continues to sicken about a dozen people every year.

Direct download .mp3

anthrax letters

boor

Dr. Kathryn Boor is a professor and chair in the Food Science department at Cornell University, where she’s director of the Food Safety Laboratory - a biosecurity level 2 laboratory that facilitates research on foodborne pathogens.  Her particular research interests lie in the “how” and “why” of pathogens and spoilage microbes in food.  Boor is also the director of the Milk Quality Improvement Program – a program funded by New York state to monitor and make recommendations to improve the quality of milk in the state.

When I think about the complicated way dairy products come to be on the shelf in my grocery store – farmers use machinery to extract milk from an animal that lives in a barn or a field; the milk is piped through long tubes to a tank on a truck that conveys the product to a plant that processes and divvies it up; the bottles and packages are put on another truck and carted to the store – it seems like a wonder dairy is ever safe to eat.  But dairy is safe: CDC data indicate that less than 1% of foodborne illness outbreaks in the U.S. involve dairy products1 2 .

Dr. Boor’s primary interest lies in Listeria monocytogenes, one of the few pathogens that is a problem in dairy, and most people who’ve heard of it associate it with unpasteurized soft cheese or cold cuts.  Listeriosis is not as common or familiar as some other foodborne illnesses, but it is more often fatal than salmonellosis or botulism, and in a pregnant woman even a mild case can be deadly for her fetus.  Dr. Boor’s research focuses on how this so-called “simple” organism is able to persist in some foods and overcome the stress of refrigeration and stomach acid to not only survive, but to make us really sick.

In this interview, I asked Dr. Boor about how she came to this particular niche in science, whether pasteurization is any better than keeping milk from getting contaminated in the first place, and what her trained eye for food safety looks out for when she’s buying food.

1 U.S. Dept. of Health and Human Services, Public Health Service and Food and Drug Admin.  2003.  Grade “A” Pasteurized Milk Ordinance.  2003 Revision.

2 Data are available at the Centers for Disease Control and Prevention’s website: http://www.cdc.gov/foodborneoutbreaks/outbreak_data.htm

Direct download: MTS15

Moselio Schaechter

Moselio Schaechter – known as Elio to his friends – is Distinguished Professor of Molecular Biology and Microbiology, Emeritus, at the Tufts University School of Medicine, and he’s currently an adjunct professor at San Diego State University and at the University of California at San Diego. Dr. Schaechter has had a long career in bacteriology and has authored or co-authored a number of text books, and is a former president of the American Society for Microbiology. He lives in sunny San Diego now, where he lectures, attends meetings, and writes his blog, “Small Things Considered”.

If you want an example of the ways the internet has changed public discourse, look to the blogs - you’re reading one now, after all, and how many blogs did you read 10 years ago? Blogs give authors a bullhorn free from profit-driven publishers, provide people with ideas, and even build communities through reader discourse. To be sure, not every blog is interesting or even readable, but there are many bloggers out there working hard and stimulating some profound discussions.

Those of us interested in the life microscopic are lucky to have Dr. Schaechter, who muses on the topics of interest to him and acts as host to other eminent scientists who write guest essays. With Small Things Considered, his goal is to express his own interest in various subjects while encouraging interest in others and kindling conversation and debate.

In my interview with Dr. Schaechter, we talk about what he gets out of being a blogger, what makes for a successful blog, and about how mushroom hunting in xeric Southern California usually involves a lot of hunting and few mushrooms.

Blogs and Websites mentioned in this episode include:

 

Direct download: MTS14

 

joel sussman

Joel Sussman, Ph.D. is a professor of structural biology at the Weizmann Institute of Science in Israel. In his research, Dr. Sussman is interested in elucidating the structures and functions of proteins, particularly those involved in the nervous system. He is also the lead scientist behind Proteopedia – a new online protein structure encyclopedia.

Scientific endeavors have historically been a one-way street: an investigator or lab makes a discovery, then delivers the good news to the rest of the community via publication. Nowadays, computers and the internet are enabling easier and more seamless means of collaboration and communication. Proteopedia, with which Dr. Sussman is greatly involved, automatically gathers and compiles information from multiple curated sources of information, but its more revolutionary side is the wiki tool, which enables registered users to contribute information themselves.

In this interview with Dr. Sussman, I talked with him about his work with acetylcholinesterase and “intrinsically unstructured proteins” and about Proteopedia – how it works and about the possibility of misinformation making its way onto the site.

The video below shows Proteopedia in action. It is narrated by Eran Hodis, the graduate student, who, together with Professors Jaime Prilusky & Joel L. Sussman developed Proteopedia at the Weizmann Institute of Science.

Direct download: MTS13

keller

Nancy Keller is a Professor of Bacteriology and Medical Microbiology and Immunology at the University of Wisconsin-Madison. A mycologist, Dr. Keller works with a genus of fungi called Aspergillus – many of which are potent plant and human pathogens that produce deadly mycotoxins. Her research focuses on finding those aspects of Aspergillus species that make them effective as pathogens and toxin factories.

Tiny fungi cause big problems for agriculture and human health, and the U.S. alone spends millions of dollars every year to fight the fungi that attack crops. Aspergillus fungi, in particular, cause a problem for crop plants themselves, but the bigger concern is the mycotoxins they produce: aflatoxin is one of the most potent naturally-occurring toxins ever discovered. What’s more, aflatoxin and other Aspergillus toxins are carcinogenic. The bottom line? Exposure to large amounts of these fungal toxins can kill you quickly, and exposure to small amounts can kill you slowly.

On this episode, I talk with Dr. Keller about her work with Aspergillus, why we don’t even know how big the fungal toxin problem is, how reproduction and toxin-making are linked in these fungi, and how we may eventually use viruses as weapons against pathogenic fungi.

Direct download: MTS12

Wednesday, 18 February 2009 15:54

MTS11 - Daniel Lew - The Yeast Cell Cycle

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Daniel Lew is a professor of Pharmacology and Cancer Biology and of Genetics at the Duke University Medical Center in Durham, North Carolina.  His research program focuses on cell cycle control in yeast, and how the cell cycle interacts with cell polarity.

Yeast cells may look simple, but inside every little single-cell package lurks an intricate creature that senses and responds cunningly to its surroundings.  Dr. Lew has uncovered many of the secrets of the tiny yeast, and since yeast bear a striking resemblance to human cells, some of these facts could help us eventually conquer our own problems with the cell cycle, including cancer – a kind of cell division gone wild.

In this interview, I talk with Dr. Lew about how a yeast cell knows when to say “when” during budding, why he studies yeast at a medical school, and where his hard-to-discern accent really comes from (hint: it’s not a North Carolina accent).

Direct download: MTS11

maurelli2007

Tony Maurelli is a professor of microbiology and immunology in the F. Edward Hébert School of Medicine at the Uniformed Services University of the Health Sciences in Bethesda, Maryland.  Dr. Maurelli’s major research interest lies in the genetics of bacterial pathogenesis – the genetic nuts and bolts of how bacteria infect humans and make us sick.

Dr. Maurelli’s work has uncovered “antivirulence genes” in Shigella flexneri, a major cause of dysentery and food borne illness.  This is an interesting concept: antivirulence genes undermine pathogenicity, so they must be broken or dropped from the genome for a bacterium to take good advantage of a host and cause disease.  These genes are a hindrance, so to become an effective pathogen, Shigella must stop using them.

In this interview, I talked with Dr. Maurelli about antivirulence genes, about whether the naming system for bacteria should be fixed, and about his favorite bacteria.

Direct download: MTS10

Wednesday, 18 February 2009 15:27

Stanley Falkow - 21st Century Microbe Hunter

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Dr. Falkow talks about his prescient concerns about the dangers of using antibiotics as growth promoters in livestock, why Salmonella is so good at making you sick, and why students who are interested in science should follow their passion.

Wednesday, 18 February 2009 10:00

MTS008 - Rachel Whitaker - The Evolution of Sulfolobus

Written by

whitakerRachel Whitaker is an assistant professor of microbiology at the University of Illinois at Urbana-Champaign, where she has developed a research program focused on the evolutionary ecology of microorganisms. Much of Dr. Whitaker’s work centers around a hyperthermophile found in geothermal springs: the archaeon Sulfolobus islandicus.

Evolution is not just history – it’s still in action today, molding humans, plants, animals and, of course, microbes, in ways we still don’t completely understand. One of Whitaker’s focus areas is archaea, a group of single-celled microbes that are found in some of the harshest environments on earth. By looking at how one variety of archaea, Sulfolobus, varies from place to place, Whitaker hopes to find whether Sulfolobus is adapting new characteristics to suit its habitats, and whether this kind of adaptation can help us explain why there are so many different kinds of microbes in the world.

In this interview, I asked Dr. Whitaker about the hot springs where she studies Sulfolobus, whether it’s hard to communicate with ecologists who work with bigger organisms, and about new discoveries she’s made related to an immune system in archaea.

Direct download: MTS8

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