Baohua Gu

Ultrahigh resolution spectroscopy and imaging of soil carbon dynamics and interactions with minerals and microbes

Lead Institution

Oak Ridge National Laboratory

Principal Investigator

Baohua Gu

Project type

Large-Scale EMSL Research

Global climate models conceptualize belowground soil organic matter (SOM) or carbon (C) as a large source of uncertainty because of the heterogeneity of various C sources with poorly defined chemical…

Ultrahigh resolution mass spectrometry analysis of permafrost soil organic carbon composition and interactions in the Arctic environment

Lead Institution

Oak Ridge National Laboratory

Principal Investigator

Baohua Gu

Project type

Exploratory Research

Arctic permafrost soils contain as much organic carbon as was believed to exist in all soils worldwide and are particularly vulnerable to climate change. Yet, the exact chemical form and composition…

Identification of Mercury-Reactive Species in Natural Organic Matter

Lead Institution

Oak Ridge National Laboratory

Principal Investigator

Baohua Gu

Project type

Exploratory Research

This study aims to utilize the state-of-the-art Fourier transform ion cyclotron resonance mass spectrometers (FTICR-MS) to identify the specific molecules in naturally dissolved organic matter (DOM)…

Understanding Microbial Catabolism of Arctic Soil Organic Matter and Its Degradation Pathways: Identifying Precursors to Small Organic Acids

Lead Institution

Oak Ridge National Laboratory

Principal Investigator

Baohua Gu

Project type

Large-Scale EMSL Research

This user proposal aims to identify the specific components of Arctic soil organic matter (SOM) that are consumed during warming experiments in the laboratory and during the thaw season at the Barrow…

Molecular Identification of Mercury Complexes with Natural Organic Matter

Lead Institution

Oak Ridge National Laboratory

Principal Investigator

Baohua Gu

Project type

Large-Scale EMSL Research

We propose to utilize the Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) to identify specific molecules in naturally dissolved organic matter (DOM) that react with mercury (Hg…

Single molecule FISH for the quantitative detection of mRNA transcripts targeting genes relevant for mercury methylation in Desulfovibrio desulfuricans ND132

Lead Institution

Oak Ridge National Laboratory

Principal Investigator

Alexander Johs

Project type

Limited Scope

Mercury (Hg) methylation by anaerobic bacteria and archaea is the primary source of toxic methylmercury (MeHg), which bioaccumulates up trophic levels and affects humans through consumption of fish…

Molecular characterization of dissolved organic matter components facilitating the transport and transformation of mercury

Lead Institution

Syracuse University

Principal Investigator

Charles Driscoll

Project type

Exploratory Research

Browning of surface water has been observed across the northeastern United States and northern Europe. This trend has generally been attributed to increases in dissolved organic matter following the…

Quantification of gene expression patterns relevant to microbial mercury transformations

Lead Institution

Oak Ridge National Laboratory

Principal Investigator

Alexander Johs

Project type

Large-Scale EMSL Research

Levels of toxic methylmercury (MeHg) in the environment are a net result of mercury (Hg) methylation and MeHg demethylation processes. Mercury methylation by anaerobic bacteria and archaea is the…

U(VI) speciation and its influence on microbial reduction in presence of humic substances

Lead Institution

Oak Ridge National Laboratory

Principal Investigator

Baohua Gu

Project type

Exploratory Research

This study is to investigate aqueous U(VI) speciation in presence of humic substances (HS) and its influence on microbial uranyl reduction. Our experimental results indicated that HS enhances the…

EMSL Science Overview

Baohua Gu

Projects

Ultrahigh resolution spectroscopy and imaging of soil carbon dynamics and interactions with minerals and microbes

Ultrahigh resolution mass spectrometry analysis of permafrost soil organic carbon composition and interactions in the Arctic environment

Identification of Mercury-Reactive Species in Natural Organic Matter

Understanding Microbial Catabolism of Arctic Soil Organic Matter and Its Degradation Pathways: Identifying Precursors to Small Organic Acids

Molecular Identification of Mercury Complexes with Natural Organic Matter

Single molecule FISH for the quantitative detection of mRNA transcripts targeting genes relevant for mercury methylation in Desulfovibrio desulfuricans ND132

Molecular characterization of dissolved organic matter components facilitating the transport and transformation of mercury

Quantification of gene expression patterns relevant to microbial mercury transformations

U(VI) speciation and its influence on microbial reduction in presence of humic substances