News24

Scientists build artificial jellyfish

2012-07-23 09:31

Paris - Using cells from rat hearts and a seer polymer film, scientists on Sunday reported they had created an artificial jellyfish that could one day help save patients with heart disease.

The exploit marks an advance in so-called biomimicry, in which a natural wonder inspires copycat innovation in the lab.

The interest in the jellyfish lies in its remarkable swimming ability, which comes from muscles that open its bell-like body and then contract it, thus ejecting water and driving the creature along.

This pump-like design has been honed by more than 500 million years of evolution to be as simple and energy-efficient as possible.

As a result, it offers tempting insights for scientists hoping to make small, reliable heart pumps for the future.

Muscle architecture

"It occurred to me in 2007 that we might have failed to understand the fundamental laws of muscular pumps," said Kevin Kit Parker, a professor of bio-engineering at the Harvard School of Engineering and Applied Sciences.

"I started looking at marine organisms that pump to survive. Then I saw a jellyfish at the New England Aquarium, and I immediately noted both similarities and differences between how the jellyfish and the human heart pump."

The paper is published on Sunday in the journal Nature Biotechnology.

Dubbed "Medusoid" after the Medusa, the snake-haired creature of mythology that provides the Latin name for jellyfish, the lab creature has a body of an ultra-thin silicone polymer with eight limb-like appendages.

The arms are coated with a protein in patterns that resemble the muscle architecture of the real jellyfish.

The protein's job is to act as a nutritional scaffold to grow and direct a batch of cells derived from the muscles of rat hearts.

Thus primed for action, Medusoid was unleashed in a lab container of electrically conductive fluid.

'Natural performance'

The scientists threw a switch to put a tiny voltage, ranging from 1V to 5V, into the fluid to make Medusoid's muscle cells contract and relax rhythmically.

As they did so, the arms opened and closed like fingers on a clenching fist, propelling Medusoid around the tank.

"I was surprised that with relatively few components - a silicone base and cells that we arranged - we were able to reproduce some pretty complex swimming and feeding behaviours that you see in biological jellyfish," said John Dabiri, a professor of aeronautics and bio-engineering at the California Institute of Technology (Caltech).

"I'm pleasantly surprised at how close we are getting to matching the natural biological performance, but also that we're seeing ways in which we can probably improve on that natural performance. The process of evolution missed a lot of good solutions."

The natural jellyfish has also inspired "Robojelly," a US Navy-backed research innovation that was showcased in March.

It has eight appendages made of shape-metal alloy - metals that remember their original shape after being scrunched up.

The appendages are coated with a platinum powder that reacts with the oxygen and hydrogen in seawater to create heat, which causes the segments to contract. When they cool down, they relax, thus ejecting the water and pushing Robojelly along.

Comments
  • nathan.loftieeaton - 2012-07-23 09:48

    Amazing!

  • uwe.klopfer - 2012-07-23 10:14

    wow

  • JNaMolefe - 2012-07-23 11:02

    Wow!

  • louwrens.brits - 2012-07-23 11:05

    The end is near - i would imagine the "Matrix" and "Terminator" guys looking at headlines like these saying "wow this is amazing - look how clever we are".........

      bob.macphearson - 2012-07-23 12:58

      You just went full retard

      merven.halo - 2012-07-23 13:16

      Check it out. Dustin Hoffman, 'Rain Man,' look retarded, act retarded, not retarded. Counted toothpicks, cheated cards. Autistic, sho'. Not retarded. You know Tom Hanks, 'Forrest Gump.' Slow, yes. Retarded, maybe. Braces on his legs. But he charmed the pants off Nixon and won a ping-pong competition. That ain't retarded. Peter Sellers, "Being There." Infantile, yes. Retarded, no. You went full retard, man. Never go full retard. You don't buy that? Ask Sean Penn, 2001, "I Am Sam." Remember? Went full retard, went home empty handed...

  • mbotsellasie - 2012-07-23 15:57

    Life? What life????

  • badballie - 2012-07-24 10:30

    Amazing, typical moronic responses from both sides of the religious argument as usual. Mememan, whats your agenda, or are you just suffering from continuous doubt in your own belief system that requires you to constantly sound of like an empty vessel? For the record, I don't believe in the religions of man either. The difference is I respect other peoples right to their own belief, leave it at that.

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