Self-Assembled Silica-Carbonate Structures and Detection of Ancient Microfossils
نویسندگان
چکیده
منابع مشابه
Self-assembled silica-carbonate structures and detection of ancient microfossils.
We have synthesized inorganic micron-sized filaments, whose microstucture consists of silica-coated nanometer-sized carbonate crystals, arranged with strong orientational order. They exhibit noncrystallographic, curved, helical morphologies, reminiscent of biological forms. The filaments are similar to supposed cyanobacterial microfossils from the Precambrian Warrawoona chert formation in Weste...
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Crystallisation of barium carbonate from alkaline silica solutions results in the formation of extraordinary micron-scale architectures exhibiting non-crystallographic curved shapes, such as helical filaments and worm-like braids. These so-called ‘‘silica biomorphs’’ consist of a textured assembly of uniform elongated witherite nanocrystallites, which is occasionally sheathed by a skin of amorp...
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Crystallisation of barium carbonate in the presence of silica can lead to the spontaneous assembly of highly complex superstructures, consisting of uniform and largely co-oriented BaCO3 nanocrystals that are interspersed by a matrix of amorphous silica. The formation of these biomimetic architectures (so-called silica biomorphs) is thought to be driven by a dynamic interplay between the compone...
متن کاملEstimate of climate sensitivity from carbonate microfossils
Introduction Conclusions References Tables Figures Back Close Full Screen / Esc This discussion paper is/has been under review for the journal Climate of the Past (CP). Please refer to the corresponding final paper in CP if available. Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Abstract Climate sensitivity is a crucial parameter in global temperature...
متن کاملELECTRON MICROSCOPY OF ANCIENT MICROFOSSILS Mentor:
Prof. Xiao’s current research focuses on the biological evolution and environmental changes in the Proterozoic Eon (2500 to 543 million years ago). He has been working on some of the most important and exquisitely preserved microfossils from the ca. 600-million-year-old Doushantuo Formation in South China. These microfossils include multicellular red algae and animal embryos at successive cleav...
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ژورنال
عنوان ژورنال: Science
سال: 2003
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.1090163