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    Home > Biochemistry News > Biotechnology News > Large Anhui silk algae is the earliest fossil evidence of early biological nitrogen fixation.

    Large Anhui silk algae is the earliest fossil evidence of early biological nitrogen fixation.

    • Last Update: 2020-08-12
    • Source: Internet
    • Author: User
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    Recently, Dr. Ponke, an early life research team at the Nanjing Institute of Geology and Paleontology of the Chinese Academy of Sciences, discovered a large Anhui silk algae with multicellular and cell differentiation, which is considered to be the earliest fossil evidence of early biological nitrogen fixation, and the results were published online February 2 in the journal Current Biology, a publishing group of Cells.
    it is known that Ponke and Tang Qing (now a doctoral student at Virginia Tech) and others, under the guidance of Yuan Tsenglai Researcher and Professor Xiao Shuhai (Virginia Tech University of the United States of America), have systematically soaked and excavated carbon-based film fossils preserved in the Liu Laostone Group (about 800 million years ago) in the early early stretch formation of the Yuan Yuan in Anhui Shou County since 2010.
    at first, in the soaked carbon membrane micro-sized stone, the team found a silkstone, including polyseon algae and tubular filaments, but it was mainly preserved by the gel of silky cyanobacteria, and did not preserve the real cell structure, and very few silk cells preserved next to the cell.
    with the simultaneous excavation work, the team found a carbon-coated macro-sized stone chulalgae in the rock samples in Liu Laostone group to preserve the multicellular structure, inspired by this, in the excavation process began to pay attention to a length usually less than 1 mm of silkstone.
    Ponke told China Science Daily: "This silkstone because of its small individual size, between most micro-body and macro-sized stone body, in the excavation process is easy to be ignored, but the use of immersion method simply can not get its full picture, so in previous research is considered to be only a tubular fossil, has not been valued."
    " team researchers in many years of excavation, accumulated hundreds of silkstone, through careful observation under the high-fold solid microscope, found that the vast majority of them preserved better multicellular and cell differentiation structure, and named it large Anhui silk algae, providing the earliest fossil evidence of early biological nitrogen fixation.
    the large Anhui silk algae here are single columns of silkstone and are wrapped in a thin layer of extracellular glue.
    in addition to the separately preserved silk, can be preserved in the form of a number of silk composition polymer, but also with other silk fossils can form benthic micro-organisms. The
    team revealed that large Anhui silk algae is a cyanobacteria fossil with a foreign cell through the characteristics of two splits, algae colonization segments, thick wall spores and other morphological, burial and other characteristics. "Although the cell width of large Anhui silk algae is large, the cell size of the largest silky cyanobacteria (such as the giant fissure and the giant cyllon it) and some silky cyanobacteria fossils (such as curly algae) overlap smaller than, or even larger than, " said
    Ponco.
    " team, through the discovery of the multicellular structure and cell differentiation of large Anhui silk algae, pushed the earliest reliable fossil record of cyanobacteria from the mud basin (about 410 million years ago) to the early period of the New China Dollar (10 to 720 million years ago), providing the earliest fossil evidence of early biological nitrogen fixation, as well as the earliest age-old valuation of the cyanobacteria and the cyan algae differentiation from other cyanobacteria.
    Ponco et al. speculated that a large number of silky cyanobacteria fossils were also preserved in the ancient-Chinese-yuan formations older than the ancient New Yuan (2.5-1 billion years ago), but none of them were reliable, or thick-walled spores, meaning that the cyanobacteria with alien cells probably originated in the early period of the New Yuan.
    cyanobacteria are produced in response to rising oxygen concentrations and protecting oxygen-sensitive nitrogen fixation enzymes, " large Anhui seraalgae also biologically confirmed the changes in the early Earth's oxidation reduction environment.
    ," Ponco said.
    .
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