P in streams

I work with some incredible grad students at the University of Alaska Fairbanks. Today, I’d like to highlight research led by Sophie Weaver, a student in the Biology & Wildlife department.

When asked about her research, Sophie likes to say she studies “P in streams.” Sophie is investigating how differences in nutrient availability might affect the growth of the organisms that make up the green scum, or microbial skins, that one slips on when crossing a stream. Besides phosphorus (the “P” in her descriptive quip), she also works with nitrate, ammonium, and acetate.

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Sophie with her little blue cups.

After adding various nutrients to little blue cups, she launches them in her research streams. Post-incubation, she collects the cups to measure the abundance of autotrophs (critters that produce their own energy) and heterotrophs (critters that, like us, consume delicious things to produce energy). The ratio of autotrophs to heterotrophs can tell her something about how nutrients impact green scum composition. This research is important because stream microorganisms directly influence water quality and ecosystem function.

Sophie conducts her research at the Caribou-Poker Creeks Research Watershed (CPCRW), a pristine watershed located about thirty-five miles northeast of Fairbanks. Rumor has it that Sophie and her labmates been known to pursue the other wonders of CPCRW besides what fuels green scum growth, from chilling ciders in wee arctic streams to stripping down, jumping in, and cooling off on a “hot” Alaskan summer day.

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The Mars Conundrum: How do we explore the Red Planet without contaminating it?

“The search for life on Mars is paired with plenty of strong warnings about how we must sterilize our spacecraft to avoid contaminating our neighbor planet. How will we know what’s native Martian if we unintentionally seed the place with Earth organisms? A popular analogy points out that Europeans unknowingly brought smallpox to the New World, and they took home syphilis. Similarly, it is argued, our robotic explorations could contaminate Mars with terrestrial microorganisms.

As an astrobiologist who researches the environments of early Mars, I suggest these arguments are misleading. The current danger of contamination via unmanned robots is actually quite low. But contamination will become unavoidable once astronauts get thereNASA, other agencies and the private sector hope to send human missions to Mars by the 2030s.”

Want to know more? Read about it here.

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You smell like bacteria… and that’s a good thing

Birds have a number of loud and showy ways to attach a mate. But they also have a subtle one: smell.

And it turns out that some of that smell are naturally made by bacteria in the preening gland.

So I’m not saying you should use “hey girl, you smell like the best bacteria” as a pick up line, but it might be worth trying!

(If you’re a bird. NiB is not responsible for this interaction going south)

Read all about the work by Danielle Whittaker over at Science News!

"Hey girl, you smell like the sexiest microbes"

“Hey girl, you smell like the sexiest microbes”

 

The elusive tree of life

In the Origin of Species, Darwin described a “great Tree of Life” which is “fills with its dead and broken branches the crust of the earth, and covers the surface with its ever branching and beautiful ramifications.”

Ever since then biologist have been trying to describe such a tree. And it should surprise no one that the recent focus on microbial ecology has expanded the Tree considerably.

Read about it at the New York Times or in the paper over at Nature Microbiology .

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Hug et al. 2016

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Darwin’s tree, in concept and in the only figure published in his Origin of Species.

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Gut Microbes are Important for Cancer Treatment

We have written so much about the rapidly expanding study of human microbiomes, I don’t think I need to point them all out (but if you want to check them out, try here, here, here, here and here).

Well, it turns out understanding the human microbiome is important for one more thing. Fighting cancer.

Two independent research teams have demonstrated that gut microbes can dramatically alter the immune system’s ability to deal with cancer (in mice). This includes 1) an individual’s natural immunity to cancer and 2) how well they respond to immunotherapy cancer drugs.

Read about it over at the Atlantic!

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Yet another example of how microbiology is important

When people say they have gut feelings, they usually mean that they are going on instinct.

However, it turns out that your instinct, or behavior, could actually be coming from your gut. Microbes that is.

 

Over at Scientific American, an excellent article summarizes a study by Rebecca Knickmeyer on just that.

She followed a group of developing infants to determine if their guts really are altering their behavior.

Check it out!

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(almost as cool as Microbes on Mars)