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24x7Report > Blog > Gadgets > Scientists build a freezer that works in the deep sea
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Scientists build a freezer that works in the deep sea

Last updated: 2023/07/23 at 1:24 AM
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This text was initially on Hakai magazine, an internet publication about science and society in coastal ecosystems. Learn extra of those sorts of tales hakai magazine. com.

Throughout Japan’s sweltering summers, there’s nothing fairly like a frozen orange. The favored deal with often called reito mikan, tastes nice whenever you make it at residence. However it tastes even higher when it is made 850 meters under the ocean’s floor. “Slightly salty, however tremendous tasty,” mentioned Shinsuke Kawagucci, a deep-sea geochemist on the Japan Company for Marine-Earth Science and Know-how.

The frozen fruit was the product of a very tasty science experiment. In 2020, Kawagucci and his colleagues designed a extremely uncommon freezer – one constructed to function beneath the extraordinary stress of the deep sea. The frozen orange, chilled within the depths of Japan’s Sagami Bay, was their proof that such a factor is feasible.

Kawagucci and his colleagues’ deep-sea freezer prototype is actually a pressure-resistant tube with a thermoelectric cooling machine inside. By operating an electrical present by means of a pair of semiconductors, the machine creates a temperature distinction because of a phenomenon often called the Peltier effect. The machine can cool the contents right down to -13 °C, properly under the freezing level of seawater. Since no liquid nitrogen or refrigerants are required to chill the housing, the freezer will be constructed compactly and with minimal engineering expertise.

With a number of modifications, Kawagucci and his colleagues write in a recent article, their prototype freezer will be greater than a flowery snack machine. By providing a option to freeze samples at depth, such a tool may enhance scientists’ capability to review deep-sea life.

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Retrieving animals from the depths is commonly a damaging affair that may go away them broken and disfigured. The very best instance is the smooth-headed blobfish, a tragic, misshapen clump of fish that will get its identify from the blob-like form it assumes when it is yanked from its residence greater than 1,000 toes under. (In its deep-sea habitat, the fish resembles many other fish and hardly lives as much as its identify.)

Whereas scientists have beforehand designed instruments to maintain deep-sea samples chilly on their option to the floor, the brand new freezer prototype is the primary machine able to freezing deep-sea samples. Likewise, different instruments exist that do this enabling scientists to collect unharmed creatures from the deepas pressurized collection chambers. Nonetheless, these typically do not work properly for small and mild deep-sea creatures which are liable to demise and decomposition if stored in such containers for too lengthy — an typically unavoidable actuality, says Luiz Rocha, the curator of ichthyology on the California Academy of Sciences in San Francisco. “It will probably take hours to gather samples,” says Rocha.

A tool that first freezes samples would forestall degradation and permit higher scientific evaluation of every thing from anatomy to gene expression. Whereas the freezing course of will undoubtedly injury the tissues of a number of the extra fragile life kinds in depth, freeze-damaged specimens are often extra helpful to scientists than decomposition-damaged specimens — at the least in terms of DNA evaluation.

The prototype freezer takes greater than an hour to freeze a pattern, which is probably going “too sluggish to be typically helpful,” mentioned Steve Haddock, a marine biologist at California’s Monterey Bay Aquarium Analysis Institute who research bioluminescence in jellyfish and ctenophores. Each minute of deep-sea exploration is treasured, he says. “We often spend our time searching for animals and we carry them to the floor in glorious situation utilizing insulated chambers.” Nonetheless, if freezing time might be improved, Haddock believes such a tool may “empower” these finding out deep-sea creatures which are extraordinarily delicate to adjustments in stress and temperature, similar to microbes that stay on hydrothermal vents.

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Kawagucci says he and his workforce plan to enhance their freezer earlier than testing it on stay specimens. However he hopes that with such enhancements, their instrument will give scientists a option to gather even probably the most delicate deep-sea organisms.

Within the meantime, Kawagucci is simply completely happy that his machine has confirmed that deep-sea freezing by means of a thermoelectric cooler is feasible. “There has by no means been ice within the deep sea in Earth’s historical past,” he says. “I needed to be the primary to fire up and see the ice within the deep sea with my freezer.” And when he lastly acquired his enamel into that spicy, salty, candy reito mikan, “one in every of my desires has come true.”

This text first appeared in Hakai magazine and is republished right here with permission.

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