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This is Scientific American 60-Second Science. I'm Cynthia Graber.Got a minute?
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Microbial organisms live in you, on you, in soil, in clouds and below the ocean floor.
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That last batch of single-celled critters is particularly hard to study.
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Not only are the samples difficult to obtain, but they can easily be contaminated with all that other microbial life once we dig them up.
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So researchers had to take special precautions when they investigated microbial life in a coal bed deep below the seafloor near Japan.
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This material was once dry land, but got submerged some 20 million years ago.
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The research team drilled nearly 2,500 meters below the seafloor and brought up samples.
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They carefully avoided contamination and evaluated only the inner portions of the samples, which were protected by the outer parts.
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Analysis found life tenaciously holding on well under the ocean.
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A gram of rich garden soil can hold a billion bacteria, at 2,500 meters below the seafloor a gram of sediment might be home to just a single microbe.
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And those deeply buried organisms are quite different from microbes to be found just under the seafloor.
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In that deep layer, the microbes are most closely related to bacterial groups that thrive in forest soils on land.
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The scientists thus suggest that the deeply buried undersea microbes might be descendants of ones that survived when their terrestrial habitat became flooded.
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Again, that was 20 million years ago.
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The finding is in the journal Science.
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In a commentary in the same issue, Julie Huber of the Marine Biological Laboratory at Woods Hole says the fact that there's "a massive buried biosphere" has global importance "with sub-seafloor microbes playing a crucial role in carbon sequestration...and Earth's evolution,
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and likely encompassing staggering metabolic and genetic diversity."
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She adds, "We still have a long way to go in uncovering and understanding microbial life deep beneath the seafloor."
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Thanks for the minute, for Scientific American 60-Second Science.I'm Cynthia Graber.
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1 / 19
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显示原文 =This is Scientific American 60-Second Science. I'm Cynthia Graber.Got a minute?
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2 / 19
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显示原文 =Microbial organisms live in you, on you, in soil, in clouds and below the ocean floor.
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3 / 19
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显示原文 =That last batch of single-celled critters is particularly hard to study.
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4 / 19
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显示原文 =Not only are the samples difficult to obtain, but they can easily be contaminated with all that other microbial life once we dig them up.
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5 / 19
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显示原文 =So researchers had to take special precautions when they investigated microbial life in a coal bed deep below the seafloor near Japan.
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6 / 19
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显示原文 =This material was once dry land, but got submerged some 20 million years ago.
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7 / 19
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显示原文 =The research team drilled nearly 2,500 meters below the seafloor and brought up samples.
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8 / 19
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显示原文 =They carefully avoided contamination and evaluated only the inner portions of the samples, which were protected by the outer parts.
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9 / 19
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显示原文 =Analysis found life tenaciously holding on well under the ocean.
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10 / 19
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显示原文 =A gram of rich garden soil can hold a billion bacteria, at 2,500 meters below the seafloor a gram of sediment might be home to just a single microbe.
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11 / 19
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显示原文 =And those deeply buried organisms are quite different from microbes to be found just under the seafloor.
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12 / 19
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显示原文 =In that deep layer, the microbes are most closely related to bacterial groups that thrive in forest soils on land.
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13 / 19
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显示原文 =The scientists thus suggest that the deeply buried undersea microbes might be descendants of ones that survived when their terrestrial habitat became flooded.
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14 / 19
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显示原文 =Again, that was 20 million years ago.
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15 / 19
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显示原文 =The finding is in the journal Science.
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16 / 19
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显示原文 =In a commentary in the same issue, Julie Huber of the Marine Biological Laboratory at Woods Hole says the fact that there's "a massive buried biosphere" has global importance "with sub-seafloor microbes playing a crucial role in carbon sequestration...and Earth's evolution,
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17 / 19
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显示原文 =and likely encompassing staggering metabolic and genetic diversity."
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18 / 19
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显示原文 =She adds, "We still have a long way to go in uncovering and understanding microbial life deep beneath the seafloor."
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19 / 19
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显示原文 =Thanks for the minute, for Scientific American 60-Second Science.I'm Cynthia Graber.
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