Life in the deep ocean has long slipped through human hands, because the microbes that thrive under crushing pressure and near-freezing cold tend to perish the moment they are carried into the ordinary world of the surface. A team has now built a robotic system called DISCUSS that keeps those conditions intact from the seafloor to the laboratory bench, and in doing so has coaxed dozens of previously unseen microbial strains into growing. The advance matters because these organisms hold clues to new medicines, materials and energy sources, and to the slow, largely unexplained way carbon moves t
Robotic System Recreates Deep-Sea Conditions to Cultivate Previously Inaccessible Microbes
Fewer than 1% of deep-sea microbes can be grown with conventional methods
Mark
Why does it matter that fewer than 1% of deep-sea microbes can be grown?
Mimi
Because we're studying a sliver of the picture. Most of the organisms, and whatever useful enzymes they carry, have been out of reach since they die during retrieval.
Mark
So what does DISCUSS do differently?
Mimi
It never lets the pressure and temperature change. Conditions are held steady from the seafloor sample through to isolating single microbes in the lab.
Luke
Worth saying that the 1% figure is a researchers' estimate, not a measured count.
Mark
And the digital twin, what role does it play?
Mimi
It's a virtual model of the deep-sea environment used alongside the sensors to monitor pressure, temperature and chemistry and adjust when needed.
Luke
The article doesn't detail how the adjustments are decided, so I'd hold back on claims about how autonomous it is.
Mark
What were the actual results?
Mimi
34 isolates from a cold seep at 1,300 meters, several apparently quite different from known strains. One, HP_SR10, only grows under high pressure. A mixed community also survived 180 days.
Luke
Note that it's from one site and one depth. The extension to deeper waters and hydrothermal vents is a stated aim, not a demonstrated result. And the applications in medicine or energy are potential, not shown here.
Der Puls
- Fewer than one percent of deep-sea microbes have ever been grown in a lab, because the rush up from the depths kills them before scientists can work with them.
- Samples pulled from a cold seep 1,300 meters down met a sudden shift in pressure and temperature that threatened to end the very life being studied.
- A robotic system called DISCUSS holds the deep-sea environment steady from the seafloor through culture and isolation, guided by sensors and a digital twin.
- Cameras and deep-learning software picked out individual colonies, and robotic tools collected 34 isolates without ever letting them leave high pressure.
- A high-pressure bacterium named HP_SR10 now grows only under conditions that once seemed impossible to reproduce, and a complex microbial community has survived together for 180 days.
Life in the deep ocean has long slipped through human hands, because the microbes that thrive under crushing pressure and near-freezing cold tend to perish the moment they are carried into the ordinary world of the surface. A team has now built a robotic system called DISCUSS that keeps those conditions intact from the seafloor to the laboratory bench, and in doing so has coaxed dozens of previously unseen microbial strains into growing. The advance matters because these organisms hold clues to new medicines, materials and energy sources, and to the slow, largely unexplained way carbon moves through the deep sea. It is a quiet reminder that some of the planet's most important living processes have been hidden simply because we could not keep them alive long enough to watch.
Samples drawn from a cold seep 1,300 meters beneath the surface became the first real test of a new robotic system called DISCUSS. It was built to solve a stubborn problem: deep-sea microbes often die on the way up, when the sudden change in pressure and temperature overwhelms them.
The deep sea is the largest microbial habitat on Earth, and its inhabitants have evolved unusual enzymes that could one day serve medicine, materials, food and energy. Yet fewer than one percent of these organisms can be cultivated with conventional methods. Most are lost before anyone can look at them closely.
DISCUSS aims to remove that shock. It keeps the deep-sea conditions in place across every stage, from collecting samples on the seafloor to growing and isolating the microbes in the lab. Real-time sensors track pressure, temperature and chemistry, robotics handle the delicate work, and a digital twin of the environment continually makes adjustments.
The results were striking. Cameras and deep-learning software identified individual colonies, and robots selected them without removing them from high pressure. In all, 34 isolates were recovered, several differing markedly from known strains. One, HP_SR10, grows only under high pressure and cannot survive ordinary atmospheric conditions. A complex community was also kept alive together for 180 days.
Scientists say this opens a path to understanding how these hidden organisms shape the carbon cycle, as carbon sinking from the surface is transformed in the depths. The researchers believe the method could eventually reach even deeper waters and hydrothermal vents.
Samples taken from a cold seep 1,300 meters (4,265 feet) below the surface were the test material for a new robotic system called DISCUSS, built to solve a problem that has long limited microbiology: deep-sea microbes tend to die on the way up.
The deep sea is the largest microbial habitat on Earth, and its inhabitants have adapted to intense pressure and near-freezing temperatures. In doing so they have developed unusual enzymes and other molecules that could prove useful in pharmaceuticals, new materials, food and energy. But researchers estimate that fewer than 1% of these organisms can be cultivated with conventional methods. When a sample is hauled to the surface, the rapid shift in pressure and temperature can kill the microbes before anyone can study them.
DISCUSS, described in the journal Nature Sensors, is designed to remove that shock. It recreates and maintains the conditions the microbes experience in their natural environment across the whole chain of work: collecting samples on the seafloor, growing the organisms in the laboratory, and isolating individual microbes.
The system combines three elements. Real-time environmental sensors track conditions such as pressure, temperature and chemical composition. Advanced robotics carry out the handling. And a digital twin, a virtual representation of the deep-sea environment, helps monitor the conditions continually and make adjustments when needed.
Once microbes began to grow, cameras and deep-learning software identified individual colonies. Robotic tools then selected and collected them for further study without taking them out of the high-pressure environment. In total, the researchers recovered 34 microbial isolates, including several that appear to differ significantly from previously identified strains.
Two of the isolates are bacteria adapted to high pressure. One, named HP_SR10, depends on high pressure to grow and cannot be cultivated under normal atmospheric conditions. The system also kept a complex community of microorganisms growing together for 180 days, by maintaining the conditions they needed over that extended period.
Zhengguang Liu, a researcher at The University of Manchester, said scientists have long struggled to grow many naturally occurring microbes in the lab, which limits understanding of how they live and function. He said that by bringing together environmental sensing, digital modeling and robotics, the team can study microbial life that was previously hard to reach. From an engineering perspective, he said, what excites him most is how intelligent sensing, modeling and automation can open up biological systems that were difficult to study.
The work also bears on a larger question. Deep-sea microorganisms play a part in global processes such as the carbon cycle. Carbon produced near the surface can eventually sink into the deep ocean, but scientists still do not fully understand how microbes at those depths transform it. Growing a wider range of them under conditions closer to their natural ones could help answer that.
The researchers say the approach could eventually be adapted to even deeper parts of the ocean and to other extreme environments, such as high-temperature hydrothermal vents.
Bemerkenswerte Zitate
By bringing together environmental sensing, digital modeling and robotics, we can study microbial life that has previously been difficult to access.— Zhengguang Liu, The University of Manchester
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