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  1. Forever chemicals are building up across the Great Lakes food web

    The research was conducted by a team at the University of Notre Dame led by Gary Lamberti and Daniele De Almeida Miranda. “Unfortunately, the Great Lakes hold onto their water and contaminants for a very long time, meaning that there’s ample time for toxins to be taken up by the biota,” Lamberti said.

  2. US’s Screwworm Fix Is Still a Year Away, Risking More Spread

    Without intervention, a female fly could lay more than 3,000 eggs over a lifespan of two to four weeks, according to Lee Haines, associate research professor of biological sciences at the University of Notre Dame.

  3. From neon mosquitoes to winged migrations, top images captured by scientists

    "It looks like I'm traveling through space, doesn't it?" asks Lee Haines, a vector biologist at the University of Notre Dame and the person peering into the microscope in the image. "I am looking at a mosquito that has taken a sugar meal that has been spiked with a drug," she says.

    Shayanta Chowdhury, the photographer and a physical chemist at the University of Notre Dame, was pleased to see his image elevating Haines' science. "Some people think scientists are in their ivory towers doing their own research and it doesn't really benefit or impact society as much," he says. "But I think it does and being able to use art to showcase that in science is powerful."

  4. Five winning images of scientists at work

    Under ultraviolet light, the yellow fever mosquito (Aedes aegypti) in Lee Haines’s microscope glows bright: a sign that it has fed on a sugar concoction spiked with a fluorescent dye and a mosquito-killing agent. Haines, an entomologist at the University of Notre Dame in Indiana, is part of a team studying how the drug nitisinone can be used to kill blood-feeding insects. 

    “The UV illumination created striking colours from both the tiny mosquito and the condensation that formed beneath the cold Petri dish,” says photographer Shayanta Chowdhury. As a chemistry PhD student at Notre Dame, Chowdhury uses lasers and spectrometers to study molecules attached to nanoparticles.

An agar plate with Mycobacterium marinum colonies, which are blue because they make an enzyme that cleaves a chemical, x-gal, on the plate. These bacteria cause a tuberculosis-like infection in fish, and are used as a model to study the mechanisms used by mycobacterium tuberculosis to cause human disease. From the lab of Patricia Champion.
Catalyst Fall 2025: Origins - Unraveling mysteries of the past through research.

Catalyst

In this issue, we feature researchers probing for the origins of life in RNA and searching for Earth-like worlds among our nearby stars.

Read Catalyst