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Journal Articles

A New approach to extracting biofilm from environmental plastics using ultrasound-assisted syringe treatment for isotopic analyses

Battulga, B.; Atarashi-Andoh, Mariko; Nakanishi, Takahiro; Koarashi, Jun

Science of the Total Environment, 849, p.157758_1 - 157758_11, 2022/11

https://doi.org/10.1016/j.scitotenv.2022.157758
 Times Cited Count：3 Percentile：38.08(Environmental Sciences)

Characterizing plastic-associated biofilms is key to the better understanding of organic material and mineral cycling in the "Plastisphere"-the thin layer of microbial life on plastics. In this study, we propose a new method to extract biofilms from environmental plastics, in order to evaluate the properties of biofilm-derived organic matter through stable carbon ($$delta$$$$^{13}$$C) and nitrogen ($$delta$$$$^{15}$$N) isotope signatures and their interactions with radionuclides especially radiocesium ($$^{137}$$Cs). After ultrasound-assisted separation from the plastics, biofilm samples were successfully collected via a sequence of syringe treatments. Biofilm-derived organic matter samples (14.5-65.4 mg) from four river mouths in Japan showed $$^{137}$$Cs activity concentrations of $$<$$75 to 820 Bq kg$$^{-1}$$ biofilm (dw), providing evidence that environmental plastics, mediated by developed biofilms, serve as a carrier for $$^{137}$$Cs in the coastal environment. Significant differences in the ($$delta$$$$^{13}$$C and $$delta$$$$^{15}$$N signatures were also obtained for the biofilms, indicating the different sources, pathways, and development processes of biofilms on plastics.

Journal Articles

Stopping-powers and straggling of $$^{15}$$N ions for nuclear reaction analysis at 6.385 MeV

Goppelt-Langer, P.*; Yamamoto, Shunya; Aoki, Yasushi; Takeshita, Hidefumi; Naramoto, Hiroshi

Nuclear Instruments and Methods in Physics Research B, 118(1), p.7 - 10, 1996/09

https://doi.org/10.1016/0168-583X(95)01119-6
 Times Cited Count：7 Percentile：55.21(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Proposal for an in situ measurement of the atmospheric methane concentration using a high-resolution quadrupole mass spectrometer

*; Hiroki, Seiji; Abe, Tetsuya; Murakami, Yoshio

Vacuum, 47(11), p.1313 - 1316, 1996/00

https://doi.org/10.1016/S0042-207X(96)00203-5
 Times Cited Count：2 Percentile：16.33(Materials Science, Multidisciplinary)

no abstracts in English

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