740 research outputs found
Anaerobic Isoprene-Degrading Microorganisms and their Impact on Microbial Methane Dynamics in Deep-Sea Carbonates and Eucalyptus-Leaf Sediments
No full textIsoprene, a highly abundant biogenic volatile organic compound, has emerged as a crucial yet overlooked factor in addressing climate change. Despite its widespread production in all forms of life, comprehensive data on its global biogeochemical cycle remain scarce. Isoprene's reactivity in the atmosphere influences methane concentrations, with detrimental implications for climate, air quality, and health. Conversely, methane is abundant in marine and terrestrial subsurface environments, where deep-sea carbonates serve as hotspots for microorganisms performing anaerobic methane oxidation—an essential process in long-term methane storage and removal from the marine carbon cycle. Recent studies by Beckmann et al. (2020), Prouty et al. (2020) have shed light on novel metabolic pathways utilized by microbial communities in carbonates for methane oxidation. Similarly, in terrestrial environments, eucalyptus trees, as the highest emitters of isoprene, may harbor microorganisms capable of metabolizing isoprene alongside methane-oxidation and formation in eukalyptus leaf detritus. However, little is known about the fate of isoprene and the potential microbial communities involved in its metabolism within deep-sea carbonates and eucalyptus-leaf sediments, potentially impacting methane metabolism. Our study aims to unravel the anaerobic pathways of microbial isoprene degradation and investigate the effects of isoprene abundance and degradation on microbial methane production and oxidation. We detected anaerobic isoprene-degradation in deep-sea carbonates and terrestrial eukalyptus-leave sediments, where methane oxidation and methane formation was pronounced. Surprisingly, the presence of isoprene inhibited mcirobial methane-oxidation as well as methane-formation, suggesting an substantial impact of the presence of isoprene on methane cycling and storage. We are currently characterizing and isolating the microorganisms involved in the isoprene and methane metabolism in these enrichment cultures
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Concentrations and isotopic ratios of organic classes and compounds isolated from surface sediments in submarine Baltimore Canyon, USA
No full textBaltimore Canyon is a submarine canyon on the mid-Atlantic margin of the United States. Surface sediments were collected from the seafloor along the canyon axis in August 2012 aboard the NOAA ship Nancy Foster as part of a multi-agency, multi-institution effort. Expedition reports are available from the Bureau of Ocean Energy Management (BOEM 2017-061). At the United States Geological Survey (USGS) Pacific Coastal and Marine Science Center (PCMSC), four samples from contrasting depositional locations in the canyon were selected for a range of organic and isotopic analyses. In combination with bulk geochemical characteristics, surface sediments from water depths of ~200-1200 m underwent a sequential extraction procedure, isolating the following organic matter classes: bulk organic matter; total lipid; nonpolar, neutral, and polar lipid classes; an acid-soluble fraction containing amino acids; and an acid-insoluble fraction. Except for the acid-soluble fraction, each class was analyzed for carbon and nitrogen quantities and stable isotope ratios, and radiocarbon content where possible, along with compound-specific carbon and nitrogen isotope analysis of individual amino acids isolated from the acid-hydrolysed fraction. The weight of sediment extracted and measured was used to convert measured quantities of organic classes and compounds to concentrations per dry weight sediment. Research and analyses were conducted by the authors and/or laboratory staff at the USGS PCMSC, University of California Santa Cruz, and Lawrence Livermore National Laboratory
Group Portrait of Early Harvey County Settlers
No full textThis black and white photograph is a scan from the Keith DeHaven Notebook No. 139. It features a group portrait of 10 women and 10 men in 1922. This photo of early Harvey County settlers is shown on page 136 of The Newton Kansan Fiftieth Anniversary Number, August 22, 1922. Back row: G. P. Stephenson, Mrs. Jas. A. Owens, Mrs. S. M. Wilson, Mrs. J. Y. Hickerson, Clara Clapp Wiley. Middle row: William Popkins, Ed Michael, James A. Owens, George S. Hollister, Mrs. Effie Chambers Walton, Mrs. George Hupp, Mrs. Lewis Prouty, Lewis Prouty. Front row: Samuel McGinn, Hattie Popkins, I. M. Grant, Jacob Badorf, Dr. J. H. Seaton, Daisy Commons Walker, Mrs. Nancy M. Gingrass.https://scholars.fhsu.edu/harvey/1395/thumbnail.jp
Day by day, and hour by hour, to cross the same old river [first line of chorus]
No full textstrophic with choruspiano and voiceTo my Child Bernice135+5Johns Hopkins University, Levy Sheet Music Collection, Box
140, Item 130By Dora Wiley.Sung with immense success by the Author in the play "Old Jed Prouty.
Day by day, and hour by hour, to cross the same old river [first line of chorus]
No full textstrophic with choruspiano and voiceTo my Child Bernice135+5Johns Hopkins University, Levy Sheet Music Collection, Box
140, Item 130By Dora Wiley.Sung with immense success by the Author in the play "Old Jed Prouty.
Exploring US Mid-Atlantic Margin methane seeps : IMMeRSS, May 2017
No full textAuthor Posting. © The Oceanography Society, 2018. This article is posted here by permission of The Oceanography Society for personal use, not for redistribution. The definitive version was published in Oceanography 31, no. 1, supplement (2018): 93
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