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科学美国人60秒:染色体可识别假鱼子酱

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This is Scientific American — 60-Second Science. I'm Christopher Intagliata.
Caviar is one of the world's priciest foods: it can cost thousands of dollars a pound. And caviar from the beluga sturgeon is the most exclusive of all. But even the experts have a hard time telling the eggs from two different species apart by appearance alone.
So scientists came up with a method that more than meets the eye: a genetic test that identifies variations in nuclear DNA that are unique to the beluga and its cousin, the sterlet. The test can differentiate roe of those two species from that of eight other species of sturgeon.
And the best part, given caviar's premium price? The test requires just a single egg. The study is in the journal Scientific Reports.

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The researchers say that by definitively identifying the real stuff, the test could prop up its high price. But the effort is not just of interest to the 1-percenters: genetic verification could also be used for conservation. Belugas are critically endangered. And since they hybridize with other sturgeon species, conservationists need to make sure that farm-raised fish they plan to reintroduce into the wild are the real thing, and not just a cheap lookalike.
Thanks for listening for Scientific American — 60-Second Science Science. I'm Christopher Intagliata.

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重点单词   查看全部解释    
verification [.verifi'keiʃən]

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n. 确认,查证,作证

 
prop [prɔp]

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n. 支柱,支持者,倚靠人
n. 道具

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exclusive [iks'klu:siv]

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adj. 独占的,唯一的,排外的
n. 独家新

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genetic [dʒi'netik]

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adj. 基因的,遗传的,起源的

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appearance [ə'piərəns]

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n. 外表,外貌,出现,出场,露面

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roe [rəu]

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n. 鱼卵 n. 獐鹿

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differentiate [.difə'renʃi.eit]

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vt. 识别,使差异,求导数,区分,区别对待

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unique [ju:'ni:k]

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adj. 独一无二的,独特的,稀罕的

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conservation [.kɔnsə:'veiʃən]

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n. 保存,防止流失,守恒,保护自然资源

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species ['spi:ʃiz]

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n. (单复同)物种,种类

 

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