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细菌氧代谢出现时间早于地球大氧化事件

2025-04-04 23:22 by 绿光

一项新研究表明,在地球大气弥漫氧气之前,地球上的细菌可能就已经适应了有氧环境。研究人员通过机器学习等方法追溯了历时数十亿年的微生物演化过程;结果发现,微生物耐氧能力的演化要早于大氧化事件(the Great Oxidation Event,或 GOE);这种能力不仅对蓝藻(Cyanobacteria)产氧光合作用的起源不可或缺,也可能对地球大气的演变至关重要。这些发现凸显了生物演化与地球地质史之间的动态关系。微生物形式存在的生命至少主宰了地球历史中的 37 亿年。然而鉴于地球上最早生命形式在化石记录中的稀缺性,因此人们对其演化知之甚少。在缺乏化石证据的情况下,研究人员利用微生物生物活动的地球化学记录来估测关键细菌谱系及其代谢新机制出现的时间。研究发现,早期需氧细菌出现于 GOE 之前(约 32.2-32.5 亿年前),表明某些谱系在产氧光合作用出现之前就已演化出了有氧代谢能力。

DOI 10.1126/science.adp1853
EurekAlert 细菌的氧代谢出现时间早于地球的大氧化事件

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细菌氧代谢出现时间早于地球大氧化事件

2025-04-04 23:22 by 绿光

一项新研究表明,在地球大气弥漫氧气之前,地球上的细菌可能就已经适应了有氧环境。研究人员通过机器学习等方法追溯了历时数十亿年的微生物演化过程;结果发现,微生物耐氧能力的演化要早于大氧化事件(the Great Oxidation Event,或 GOE);这种能力不仅对蓝藻(Cyanobacteria)产氧光合作用的起源不可或缺,也可能对地球大气的演变至关重要。这些发现凸显了生物演化与地球地质史之间的动态关系。微生物形式存在的生命至少主宰了地球历史中的 37 亿年。然而鉴于地球上最早生命形式在化石记录中的稀缺性,因此人们对其演化知之甚少。在缺乏化石证据的情况下,研究人员利用微生物生物活动的地球化学记录来估测关键细菌谱系及其代谢新机制出现的时间。研究发现,早期需氧细菌出现于 GOE 之前(约 32.2-32.5 亿年前),表明某些谱系在产氧光合作用出现之前就已演化出了有氧代谢能力。

DOI 10.1126/science.adp1853
EurekAlert 细菌的氧代谢出现时间早于地球的大氧化事件

#科学

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Pinterest (PINS) Stock Sinks As Market Gains

Pinterest (PINS) closed at $71.75 in the latest trading session, marking a -0.18% move from the prior day. This change lagged the S&P 500's daily gain of 0.1%. Meanwhile, the Dow gained 0.9%, and the Nasdaq, a tech-heavy index, lost 0.59%. Heading into today, shares of the digital pinboard and shopping tool company had lost 17.41% over the past month, lagging the Computer and Technology sector's loss of 5.38% and the S&P 500's gain of 0.71% in that time. Investors will be hoping for strength from PINS as it approaches its next earnings release. The company is expected to report EPS of $0.07, up 170% from the prior-year quarter. Our most recent consensus estimate is calling for quarterly revenue of $467.87 million, up 72.05% from the year-ago period.

The lead from Wall Street offers little clarity as the major averages opened lower on Friday and then bounced back and forth across the unchanged line, finally finishing mixed and little changed.The Dow added 33.18 points or 0.10 percent to finish at 34,798.00, while the NASDAQ eased 4.54 points or 0.03 percent to close at 15,047.70 and the S&P 500 rose 6.50 points or 0.15 percent to end at 4,455.48. For the week, the Dow rose 0.6 percent, the NASDAQ added 0.1 percent and the S&P gained 0.5 percent.The lackluster performance on Wall Street came on uncertainty about the outlook for the markets following recent volatility.

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