These Bacteria Steal From Iron, and Could Be Secretly Helping to Curb Climate Change



Shahla Farzan: That is Scientific American’s 60-Second Science. I’m Shahla Farzan.

A pair billion years in the past—about three billion to be a bit of extra exact—the earth was a really totally different place. It had huge oceans and nearly no oxygen within the ambiance. It was a spot the place micro organism dominated. 

A few of these micro organism used photosynthesis to energy themselves, sort of like vegetation … however they did it in an odd manner—by harnessing mild and stealing electrons from iron.

Quick ahead about 2 billion years and people micro organism nonetheless exist right this moment. They’re referred to as photoferrotrophs and for many years, scientists thought they have been fairly uncommon. 

Arpita Bose: Most individuals suppose these are unique organisms that do different issues and photoferrotrophy is simply one thing that they could have retained from the previous, throughout early earth historical past.

Farzan: Arpita Bose is a microbiologist at Washington College in St. Louis. 

In 2015, on a whim, Bose collected some vials of marine sediment from Woods Gap, Massachusetts, and introduced them residence to her lab in Missouri.  

Her college students slowly parsed out the person strains of micro organism, they usually began testing them, one after the other, making an attempt to determine if any of them nonetheless had that historical metabolism.

Bose nonetheless remembers the day two of her college students got here into her workplace with the outcomes. 

Bose: And so they have been like, all of them do it. All of them do photoferrotrophy. And I used to be like, ‘What?! No manner! No manner.’ I used to be sort of shocked. [laughs]


Farzan: All fifteen bacterial strains have been photoferrotrophs. Perhaps, they began pondering, this trait wasn’t that uncommon in spite of everything.

The research seems within the Multidisciplinary Journal of Microbial Ecology. [Dinesh Gupta et al., Photoferrotrophy and phototrophic extracellular electron uptake is common in the marine anoxygenic phototroph Rhodovulum sulfidophilum]

An enormous motive why they care — past simply fundamental scientific curiosity — is the truth that these microbes are vacuuming up carbon dioxide as they photosynthesize.

Bose: If that is really as frequent as our information suggests they’re, it is potential that these organisms do make a large contribution to carbon dioxide fixation as nicely.

Farzan: Which means preserving the wetlands and estuaries the place these micro organism thrive could possibly be an necessary part of combating local weather change. 

Proper now, these habitats are quickly disappearing, says Michael Guzman, a microbiologist at Lawrence Livermore Nationwide Laboratory and one of many research co-authors. 

Michael Guzman: These environments are a hotbed for organic range. There’s a number of issues occurring in these environments that we nonetheless don’t learn about. So I believe preserving these pure microbial communities is admittedly necessary.

Farzan: For Scientific American’s 60-Second Science, I’m Shahla Farzan. 

[The above text is a transcript of this podcast.]


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