If you tuned in last week, you'll know that diatoms produce one quarter of the air we breathe (and they produced this podcast's logo), but did you know that they can also be used to solve crimes???! Rather than spoiling too much by writing a long caption here, you should just press play to hear from Dr. Kirstie Scott, a forensic diatomist and one of the most interesting people I've spoken with. In this episode we discuss how certain environments have certain cells and how these cells can travel on clothes and in bodies. We also talk about different types of evidence, testifying in court, and many ways in which trace signatures of organisms in the environment can be used in to answer diverse research questions. If you like Dexter or Bones or true crime, this episode is for you!

Kirstie is a senior lecturer in forensic bioscience at Liverpool John Moores University in the UK where she specializes in diatom analysis. You can find her on Linkedin, Google Scholar, X, and Bluesky.

Here are some resources Kirstie recommends:

1. How microscopic algae are helping forensic teams catch criminals
2. Research article on marine diatoms as trace evidence indicators
3. Dead bodies can reveal details of their death through microscopic diatoms

For more info on microbes and to follow updates of this podcast, find @couch_microscopy on Instagram or visit www.couchmicroscopy.com/store for merch!

The views and opinions expressed on this program are those of the host and guests and do not reflect the views of any institution.

Diatoms are beautiful (and weird). Dinoflagellates are weird (and beautiful). They are completely different organisms but both are protists that can both support whole ecosystems or cause devastating environmental hazards. However, only one of them inspired Alfred Hitchcock to make his famous movie, The Birds (listen to find out which). Both organisms can produce oxygen to help us breathe, and diatoms alone produce over 20% of the oxygen in the atmosphere. And sometimes dinoflagellates will ingest diatoms and use their innards to steal photosynthesis, creating a new type of organism called a "dinotom"! That was a very chaotic group of sentences but luckily this week we have Dr. Brittany Sprecher on the podcast who is an expert at diatoms, dinoflagellates, AND dinotoms. What a combo! We discuss a lot on this episode and you will come away learning all about the amazing research going on with these funky microbes.

Brittany Sprecher is a postdoctoral researcher at Woods Hole Oceanographic Institution. You can follow her work on Google Scholar.

Here are some links Brittany recommends to learn more about these protists:

1. Short Klaus Kemp diatom arranging documentary
2. Phytoplankton Identification guide (California coast)
3. Microorganisms PARODY video
4. "The algae that saved an astronaut's life" video
5. Wiki for Amoebophrya, the dinoflagellate parasite that infects other dinoflagellates
6. Bioluminescent waves in Monterey Bay
7. Bioluminescence vs. fluorescence video

For more info on microbes and to follow updates of this podcast, find @couch_microscopy on Instagram or visit www.couchmicroscopy.com/store for merch!

The views and opinions expressed on this program are those of the host and guests and do not reflect the views of any institution.

Did you know that some organisms, from protists to sea slugs, steal photosynthesis? This week Dr. Matt Johnson is on the podcast to talk about his work on kleptoplasty, the process by which organisms steal plastids (photosynthetic organelles) from other organisms to become photosynthetic. These special cells with stolen plastids are mixotrophs, that is, they can both eat food and produce their own from solar energy. Matt discusses why kleptoplasty and mixotrophy are special processes that aren't as rare as we might think and how they affect the ocean and planet. He also talks about ciliates, a very enigmatic group of protists that he uses to study mixotrophy. And listen all the way through for a crash course on the Grateful Dead!

Matt is an associate scientist with tenure at Woods Hole Oceanographic Institution. You can follow his work on his Google Scholar page or website.

To learn more about ciliates, other protists, and kleptoplasty:

1. Foissner user-friendly guide to ciliate identification (1996)
2. Open source protist illustrations by Keeling and Eglit (2023)
3. Nat Geo "Solar-Powered Sea Slugs" article

For more info on microbes and to follow updates of this podcast, find @couch_microscopy on Instagram or visit www.couchmicroscopy.com/store for merch!

The views and opinions expressed on this program are those of the host and guests and do not reflect the views of any institution.