{"id":6928,"date":"2016-02-06T09:34:32","date_gmt":"2016-02-06T09:34:32","guid":{"rendered":"http:\/\/192.168.99.100:8080\/?page_id=6928"},"modified":"2017-02-14T16:30:50","modified_gmt":"2017-02-15T00:30:50","slug":"nss-mark-lever","status":"publish","type":"page","link":"https:\/\/www.darkenergybiosphere.org\/outputs-resources\/networked-speaker-series\/nss-mark-lever\/","title":{"rendered":"Networked Speaker Series #4"},"content":{"rendered":"<section class=\"l-section wpb_row height_medium\"><div class=\"l-section-h i-cf\"><div class=\"g-cols vc_row type_default valign_top\"><div class=\"vc_col-sm-12 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\" ><div class=\"wpb_wrapper\"><table>\n<tbody>\n<tr>\n<td><img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/www.darkenergybiosphere.org\/wp-content\/uploads\/36_NSS_leverFACE.jpg\" alt=\"%image_alt%\" width=\"125\" height=\"125\" \/><\/td>\n<td>\n<h4>April 4, 2013<\/h4>\n<h4><strong>Dr. Mark Lever<\/strong>, Aarhus University<\/h4>\n<h4><em>Evidence of Microbial Carbon and Sulfur Cycling in Buried Ridge Flank Basalt and General Implications for Life within Earth\u2019s Oceanic Crust<\/em><\/h4>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Abstract<\/h3>\n<p>With an area that covers ~60% of the Earth\u2019s surface and an average thickness of ~7 km, sediment-covered flanks of mid-ocean ridges may constitute the largest ecosystem on Earth by volume. Yet, the community composition and metabolic function of organisms inhabiting this vast ecosystem are still largely unknown. We demonstrate the presence of methane- and sulfur-cycling microbes in anoxic, 3.5-million-year-old oceanic crust on the eastern flank of the Juan de Fuca Ridge in the North East Pacific. Depth intervals with functional genes indicative of methane-cycling and sulfate-reducing microorganisms are enriched in solid-phase sulfur and total organic carbon, host \u03b413C- and \u03b434S-isotopic values that are evidence of in situ C- and S-cycling, and show clear signs of microbial activity when incubated in the laboratory. Downcore changes in carbon and sulfur cycling reveal an environment in which micro- to macro-scale geochemical and hydrological heterogeneities drive the distribution of microbial activity. Chemoautotrophic \u03b413C-signatures indicate microbial communities to be largely supported by autochthonous energy from rocks, rather than photosynthesis-derived organic matter. General implications and future directions for the investigation of life in Earth\u2019s potentially largest ecosystem are discussed.<\/p>\n<h3>Speaker Biography<\/h3>\n<p>Mark Lever is a senior postdoctoral researcher at the Center for Geomicrobiology at Aarhus University, Denmark. His research interests include anaerobic carbon cycling and development of a DNA extraction method separating extracellular and intracellular DNA from subseafloor environments.<\/p>\n<h3>Recording<\/h3>\n<p style=\"text-align: center;\"><iframe src=\"https:\/\/www.youtube.com\/embed\/T2yrVDXoiAw\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/section>\n","protected":false},"excerpt":{"rendered":"April 4, 2013 Dr. Mark Lever, Aarhus University Evidence of Microbial Carbon and Sulfur Cycling in Buried Ridge Flank Basalt and General Implications for Life within Earth\u2019s Oceanic Crust Abstract With an area that covers ~60% of the Earth\u2019s surface and an average thickness of ~7 km, sediment-covered flanks of mid-ocean ridges may constitute the...","protected":false},"author":1,"featured_media":0,"parent":2762,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/pages\/6928"}],"collection":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/comments?post=6928"}],"version-history":[{"count":6,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/pages\/6928\/revisions"}],"predecessor-version":[{"id":10892,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/pages\/6928\/revisions\/10892"}],"up":[{"embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/pages\/2762"}],"wp:attachment":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/media?parent=6928"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}