It’s the coolest story I’ve seen in the past few days: The New York Times reported how an Italian museum cleaned its priceless Michelangelo sculptures with an army of bacteria. As Jason Horowitz wrote, “restorers and scientists quietly unleashed microbes with good taste and an enormous appetite on the marbles, intentionally turning the chapel into a bacterial smorgasbord.”
And you just want to
kill them all with your hand sanitizers and anti-bacterial soaps.
The Medici Chapel in Florence had the good fortune to be blessed with an abundance of works by Michelangelo, but the bad fortune to have had centuries of various kinds of grime building up on them. In particular, over time the corpse of one Medici “…seeped into Michelangelo’s marble, the chapel’s experts said, creating deep stains, button-shaped deformations…”
This is, I assume, why they
tell you not to touch the art.
Scientists picked a
bacteria -- Serratia ficaria SH7, in case you’re taking
notes – that ate the undesired grime without also eating the underlying
marble. It wasn’t hazardous to humans either and didn’t
create spores that might go elsewhere. “It’s better for our health,” one of the
art restorers told NYT. “For the
environment, and the works of art.”
The technique was a success, allowing the sculptures to
look like they did centuries ago. Medici Chapel after bacteria.
Credit: Gianni Cipriano for NYT
Using such bacteria to clean art has been around for at a
decade, and not
just for sculptures. Perhaps more
surprising is bacteria isn’t just cleaning art, it’s also creating
it; the American Society for Microbiology hosts an annual Agar
Art Contest.
If you’re impressed by that, researchers are teaching bacteria
to read, or at least to recognize letters.
That’s not all they might learn to do.
“For example, the framework and algorithm in our study can be used to
facilitate the design of living therapeutics, such as targeted drug release
systems based on engineered probiotic bacteria systems,” the researchers say.
The thing is, we not only don’t know what microbes do,
or could do, but we have only a vague understanding how they surround us. That’s starting to change. We’ve known for some time that each of us has
a unique microbiome (including mycobiome!). What we didn’t realize until recently was
that each urban area has its own microbiome as well.
A new study
took samples from the subway systems in 60 cities around the world, and found
thousands of previously unknown viruses and bacteria. There was a “core urban microbiome” that almost
all the cities shared, but each city had its unique microbiome. Summary of study. Credit: Danko, et. alia
The authors conclude:
…these data suggest that urban microbiomes should be treated as ecologically distinct from both surrounding soil microbiomes and human commensal microbiomes. Though these microbiomes undoubtedly interact, they nonetheless represent distinct ecological niches with different genetic profiles.
"Every city has its own 'molecular echo' of the
microbes that define it," said
senior author Christopher Mason, a professor at Weill Cornell Medicine (WCM).
"If you gave me your shoe, I could tell you with about 90% accuracy the
city in the world from which you came."
There may be, Dr. Mason
thinks, as much biodiversity on a subway railing as in rainforest (which, if
you’ve ridden any U.S. subways, probably does not come as a surprise). He marvels:
“I
think it’s a wonderful affirmation of how much left we have to discover about
the world.”
“The amount of
microbial diversity is just incomprehensibly vast,” Erica Hartmann, a
microbiologist who was not involved in the study told
The New York Times. “There’s
so much out there that we just don’t really understand, and there could be all
kinds of nifty biotechnologies and all kinds of fun chemistries that we’re not
aware of yet.”
The researchers were able to identify “antimicrobial resistance genes” that indicated resistance to antibiotics and other antimicrobial agents. Lead author David Danko speculated:
Can we give some kind of heads-up about what to look for? Can we track the spread of bacteria or genes that will make bacteria resistant to antibiotics in the future? Can we use this as a way to inform public health departments in the use of antibiotics going forward?
The team is creating a “global
metagenomic map” of the organisms, and plans to keep swabbing to collect more
sample. A companion
paper looked at the “air microbiome” of the subways systems, finding a
similar “geographic specificity.”
They’re all around us. They’re in us. We live in a microbial world. Some
argue that our microbiome should be considered another organ, although it
may be more accurate to view it as a colony that tries
to tolerate us. However you view microbes,
they’re not going away; if they did, we would as well.
The pandemic has caused all of us to fear the coronavirus,
and to take measures to kill it. We all desperately
sought Clorox wipes, stayed away from other people and their viruses, and tried
things like UV
sterilization. Scientists worry all
these efforts may have unintended consequences.
“We’re starting to realize
that there’s collateral damage when we get rid of good microbes, and that has
major consequences for our health,” said
B. Brett Finlay, first author of a paper on the topic in
PNAS.You remember
As Dr. Finley told
James Hamblin for The Atlantic. “The microbes
we carry around are involved in many of the fundamental processes of Homo sapiens.” Brendan Bohannan, a professor at the
University of Oregon, agreed, telling
The New York Times: “The more we learn about our relationships with the microbial world, the
clearer it is that we are connected to them and to the rest of the natural world.”
Mr. Hamblin concluded: “The ongoing challenge is to avoid binary thinking about microbes:
They are not simply good or bad, any more than people are, and neither is Purell.”
Last year I argued
that modern medicine was reaching the kind of limits that classical physics did
at the beginning of the 21st century, when quantum effects were
starting to become known. It required an
entirely new approach to physics – quantum physics – to deal with them, and
that ended up revolutionizing physics and our understanding of the world.
Medicine needs that kind of “quantum” revolution,
particularly in regards to understanding, accepting, and benefiting more from
our coexistence with the microbial world.
If we can co-opt microbes to clean art, who knows what we can “convince”
them to do for our health?