Hanna Bertucci, a junior in the Hartmann lab, was awarded first place in the Natural Sciences and Engineering category of the poster presentation session at the 2020 Undergraduate Research and Arts Exposition, hosted by the Office of Undergraduate Research. Her poster described the work she has been doing with graduate student Alex McFarland and fellow undergrad Erica Littman to characterize triclosan tolerance mechanisms in a variety of species within the genus Pseudomonas. Due to COVID-19, the Expo was held virtually this year, with students recording their presentations and sharing their posters online.

Poster presentations were judged by faculty from throughout the university. Judges left Hanna glowing comments:

“Very easy to follow – I loved the arrow that moved as you talked. The color coding helped too.”

“Carried out very complicated experiment, shows great knowledge of subject matter.”

“You made this comprehensible to me! Thank you.”

“This project was admirably clearly presented and I felt that as a professor in the humanities I could follow it entirely. Neither the subject matter nor poster sessions themselves exist in my field.”

“The problem was introduced quite skillfully, and both the context and broader implications were well explained. I thought that the use of the pointer during the presentation was well-done, as it allowed the distant viewer to follow the logic of the presenter.”

Way to go Hanna!

In the wake of the COVID-19 pandemic, people are thinking a lot more about cleaning. Prof. Erica M. Hartmann weighed in on how to get rid of viruses while minimizing the risk of antibiotic resistance. Check out some of the media coverage (updated 4/15/2020 4:50 pm):

• Protecting yourself and your home from coronavirus on Fox32 News
• Environmental Biologist Offers Tips For Cleaning And Disinfecting Your Home During COVID-19 Crisis on CBS Chicago
• This Is What A Microbiologist Told Us About Cleaning Our Gadgets on BuzzFeed
• Fight viruses in your home without making bacteria stronger in Popular Science
• Coronavirus FAQS: Does It Live On Clothes? Can My Dog Infect Me? Any Advice On Wipes? on NPR
• Fighting the coronavirus with disinfecting sprays and solutions: What works? in the Chicago Tribune
• How long does coronavirus live on surfaces in your home? Up to three days, in some cases. An expert explains how we can deal with it. in the Chicago Tribune
• ‘Deep cleaning’ doesn’t mean anything. Still, deep cleaners are in high demand in the LA Times
• 5 tips to clean your home, from a microbiologist in Inverse.com
• How to Disinfect Your Home in the Time of Coronavirus in houselogic
• Combating Coronavirus – How New and Old Tech Help to Disinfect Covid-19 in Cars in Auto Futures

Check out our research on how cleaning products and antimicrobials affect antibiotic resistance. And for a bonus, here’s a blog post on how cleaning with bleach impacts indoor air quality.

Some folks from BTN recently came out to do a shoot for a LiveB1G video, which is now up!

You can also see some behind the scenes shots on Instagram. Thanks to all the folks in the lab who made way for the film crew and took time to meticulously demonstrate some of the work we do.

Learn about how manmade chemicals are altering our microbial world with Prof. Erica Hartmann at the Firehouse Grill. This event is part of the Northwestern Science Cafe. All are welcome!

Mia Tran, a sophomore in the Hartmann lab, was recently granted admission to the Science Undergraduate Laboratory Internship (SULI) program. Congrats, Mia! Here’s what she has to say about it:

I’ve been offered the opportunity to intern at Argonne National Laboratory this summer, under the SULI program supported by the Department of Energy, which I’m very very excited about. I will be doing research on contaminant cycling and transformations in wetland environments, which aligns well with my current interest in water, chemistry, and ecosystems. It feels surreal to me still, and I could not have gained the experience and connections that were important in my application process without the time I’ve spent with this lab!

• Bacteria can swap their genes with neighboring bacteria
• Study finds that antibiotic resistance genes can be transferred
• Nonpathogens could give antibiotic resistance genes to pathogens

EVANSTON, Ill. — Indoor dust is evolving — and not in a good way.

A new Northwestern University study is the first to find that bacteria living in household dust can spread antibiotic resistance genes. Although most bacteria are harmless, the researchers believe these genes could potentially spread to pathogens, making infections more difficult to treat.

“This evidence, in and of itself, doesn’t mean that antibiotic resistance is getting worse,” said Northwestern’s Erica Hartmann, who led the study. “It’s just one more risk factor. It’s one more thing that we need to be careful about.”

The study will be published on Jan. 23 in the journal PLOS Pathogens. Hartmann is an assistant professor of environmental engineering in Northwestern’s McCormick School of Engineering.

A bacterium can share its genes by using either of two methods: dividing, which is the equivalent to having a baby, or horizontal gene transfer. The primary method for spreading antibiotic resistance genes among species, horizontal gene transfer occurs when a bacterium makes a copy of its genes and swaps them with a neighbor.

Bacteria can share many different types of genes — as long as the genes have mobile segments of DNA. Hartmann and her team were the first to find that antibiotic resistance genes in dust microbes have mobile capabilities.

“We observed living bacteria have transferrable antibiotic resistance genes,” Hartmann said. “People thought this might be the case, but no one had actually shown that microbes in dust contain these transferrable genes.”

Although it is rare for pathogens to live in indoor dust, they can hitchhike into homes and mingle with existing bacteria.

“A nonpathogen can use horizontal gene transfer to give antibiotic resistance genes to a pathogen,” Hartmann explained. “Then the pathogen becomes antibiotic resistant.”

Why do bacteria share genes? Hartmann says they can’t handle the stress of being indoors. The indoor environment might be too dry and cold without enough food, for example, or it might be occasionally spritzed with antimicrobial solutions. (Hartmann, by the way, recommends dusting with a damp cloth instead of using antimicrobial solutions, which can make bacteria more resistant to antibiotics.)

“Microbes share genes when they get stressed out,” Hartmann said. “They aren’t equipped to handle the stress, so they share genetic elements with a microbe that might be better equipped.”

The study, “Mobilization antibiotic resistance genes are present in dust microbial communities,” was supported by the Alfred P. Sloan Foundation and the Biology & the Built Environment Center at the University of Oregon.

This story was originally published by Northwestern University.

The image is reproduced from Ben Maamar et al. JESEE 30:1-15 (2020).

PhD student Alexander McFarland recently did some outreach with senior citizens. He talks about the experience here.

I recently had the opportunity to go to the Levy Center with the Science Policy Outreach Task Force (SPOT), a Northwestern University science advocacy group, to speak with senior citizens about bacterial antibiotic resistance. When I first signed up for this event, I was told to give a presentation about any important scientific problem that voting-aged citizens should be aware of. Naturally, I picked antibiotic resistance due to its increasing clinical prevalence and the need for policy-level actions to reverse the trend.

In my mind, the battle between scientists developing antibiotics and bacteria evolving resistances to them is similar to arms races in human history. Using this metaphor, I hoped to communicate that you can help stop the arms race by:

• Listening to your doctor
• Not taking antibiotics when you have a cold
• Taking all antibiotics for their prescribed length

At the conclusion of my talk the audience had many more specific and detailed questions and comments that went beyond my simple presentation on the antibiotic arms race. We ended up having an informative discussion on topics such as antibiotic use in farm animals and the pros and cons of antibacterial vaccines. Overall, I had a great time and look forward to future outreach events with SPOT.

Alex from the @ericamhartmann lab and I chatted with some curious and engaged seniors this morning about GMOs/food labels and antibiotics. We had some great questions! Check out @SPOTforceNU to learn more about their really amazing Science with Seniors program! 🌽🦠💊 – LC pic.twitter.com/3P7zhSYPwK

— The Lucks Lab (@LucksLab) September 11, 2019

During ASM Microbe 2019 in San Francisco (the Amer. Soc. For Microbiology Annual Conference), postdoc Ryan Blaustein presented some Hartmann Lab research in the popular science communication session “The Up-Goer Five Thing: Simple Words for Tiny-Life Studies.” The UG5 objective is to share your work in a simple and entertaining way by using only the ten hundred most commonly used words. Here are some examples and a handy text editor to test for the approved language.

The ASM session was set up as a competition between “People Running Things” (PIs) and “People Still Learning” (trainees). Each presentation was treated like a normal 5-minute powerpoint pitch, but with a UG5 twist on things…well, there was a surprise guitar sing-a-long led by one of the participants. At the end, the audience voted on the best team overall (best hypothesis, methods, results), team MVPs, and best word/phrase substitution. Team “People Still Learning” won – congrats team! Here’s what twitter had to say about the event.

Here’s Ryan’s reaction to the event:

“Participating in the UG5, from preparing the abstract to giving the formal presentation, was a fun learning experience. It helped me think about new and better ways to communicate my everyday work. All scientists can certainly benefit from knowing how to share their work in lay terms. Now, along with Erica and Jim, I would like to help bring this type of event to our department at Northwestern University to challenge student’s science communication skills in a creative arena.”

Postdoc Ryan Blaustein will be representing the Hartmann Lab at ASM Microbe this year and sharing his work related to the pangenomes of microbes in space. Check out his poster on Friday and his Up Goer 5 presentation on Saturday! You can also connect with Ryan on Twitter.

On April 16th, the Hartmann lab group took a day trip down to the University of Chicago for the 2019 Microbiome Symposium.

We listened to some lovely talks from researchers in various fields, but all of the talks highlighted emerging methods in microbiome research. The day served as a great opportunity to network with scientists from around the Chicagoland area. Three of our members (Ryan Blaustein, Alex McFarland, and Jiaxian Shen) used the symposium as an opportunity to share their research in poster form.