Yukio Isozaki

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Methanogenic microbes may be one of the most primitive organisms, although it is uncertain when methanogens first appeared on Earth. During the Archaean era (before 2.5 Gyr ago), methanogens may have been important in regulating climate, because they could have provided sufficient amounts of the greenhouse gas methane to mitigate a severely frozen condition(More)
The end-Permian mass extinction is now robustly dated at 252.6 ± 0.2 Ma (U–Pb) and the Permian–Triassic (P–T) GSSP level is dated by interpolation at 252.5 Ma. An isotopic geochronological timescale for the Late Permian–Early Triassic, based on recent accurate high-precision U–Pb single zircon dating of volcanic ashes, together with calibrated conodont(More)
Digital microfluidics can also be used in analyses involving biological cells. In a cellbased screen, droplets containing cells, viability reporters, and toxic substrates at different concentrations can be dispensed, mixed, and evaluated with a fluorescence assay (see the figure, middle panel) (13). The dose-response curves generated by such devices are(More)
Unique new fossil assemblages containing the large bivalve family Alatoconchidae are recorded from the Guadalupian (Middle Permian) shallow marine limestone in Kamura, Kyushu. The large bivalves occur in the Neoschwagerina Zone and Lepidolina Zone. This discovery establishes that the biostratigraphic range of the family Alatoconchidae extends up to the top(More)
a Dept. of Complexity Sci. & Engr., Univ. of Tokyo, Kashiwa, Chiba 277–8561, Japan b Dept. of Earth & Planetary Sci., Univ. of Tokyo, Bunkyo, Tokyo 113-0033, Japan c Planetary Exploration Res. Center, Chiba Inst. of Tech., Tsudanuma, Chiba 275–0016, Japan d Dept. of Earth Science & Astronomy, Univ. of Tokyo, Meguro, Tokyo 153–8902, Japan e Division of(More)
Domain-level identification of microbial cells or cell-like structures is crucial for investigating natural microbial communities and their ecological significance. By using micro-Fourier transform infrared (micro-FTIR) spectroscopy, we established a technical basis for the domain-level diagnosis and quantification of prokaryotic cell abundance in natural(More)
The Capitanian (Late Guadalupian) Maokou Formation at Chaotian in northern Sichuan, South China, is composed mainly of shallow marine shelf carbonates deposited on the Tethyan side of South China. By detailed field mapping and scientific drilling, we newly found out unique fossil assemblages and a sharp lithologic change in the upper part of the Maokou(More)
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