22 Anaerobic methane oxidizing communities of archaea (ANME) and sulfate reducing bacteria 23 (SRB) grow slowly, which limits physiological studies. High methane partial pressure was 24 previously successfully applied to stimulate growth, but it is not clear how different ANME 25 subtypes and associated sulfate reducing bacteria (SRB) are affected by it. Here, we report 26 growth of ANME/SRB in...

Methane is abundant and relatively inexpensive, making it an attractive feedstock for producing bulk chemicals. However, the low reactivity of methane makes it difficult to develop commercially viable processes for methane conversion. Because of favorable thermodynamics, many authors have investigated the oxidation and oxidative carbonylation of methane. By contrast, the sulfonation of methane ...

the cane alcohol vinasse assessment on the removal efficiency of a fixed biomass anaerobic reactor (fbar) was evaluated. crude vinasse was used to feed the reactor. the fbar was operated with organic load rate (olr) of 0.5, 1, 3 and 6 gcod/l/d. removal efficiencies of 85, 82, 75 and 66 per cent were observed respectively. the fba reactor presented an excellent removal of organic matter, however...

Exhaled methane concentration measurements are extensively used in medical investigation of certain gastrointestinal conditions. However, the dynamics of endogenous methane release is largely unknown. Breath methane profiles during ergometer tests were measured by means of a photoacoustic spectroscopy based sensor. Five methane-producing volunteers (with exhaled methane level being at least 1 p...

In June 2007 sediment cores were collected in Alaminos Canyon, Gulf of Mexico across a series of seismic data profiles indicating rapid transitions between the presence of methane hydrates and vertical gas flux. Vertical profiles of dissolved sulfate, chloride, calcium, magnesium, and dissolved inorganic carbon (DIC) concentrations in porewaters, headspace methane, and solid phase carbonate con...

Public concerns over potential environmental contamination associated with oil and gas well drilling and fracturing in the Wattenberg field in northeast Colorado are increasing. One of the issues of concern is the migration of oil, gas, or produced water to a groundwater aquifer resulting in contamination of drinking water. Since methane is the major component of natural gas and it can be disso...

The presence of methane on lactulose breath test among irritable bowel syndrome (IBS) subjects is highly associated with the constipation-predominant form. Therefore, we set out to determine whether methane gas can alter small intestinal motor function. In dogs, small intestinal fistulae were created to permit measurement of intestinal transit. Using a radiolabel, we evaluated transit during in...

Anaerobic fermentation of the undigested polysaccharide fraction of carbohydrates produces hydrogen in the intestine which is the substrate for methane production by intestinal methanogens. Hydrogen and methane are excreted in the flatus and in breath giving the opportunity to indirectly measure their production using breath testing. Although methane is detected in 30%-50% of the healthy adult ...

In order to better predict soil sinks of methane, we need to examine soil methane ̄ux patterns and responses to altered soil moisture regimes. Estimates of the global atmospheric CH4 budget must also account for ̄uxes in the vast boreal region. We measured methane ̄uxes into the soil surface, methane concentrations, water content, and temperature in the soil pro®le in two interior Alaskan fores...

The use of robots for surface methane concentration (SMC) monitoring at municipal solid waste (MSW) landfills has the potential to improve quality of data acquisition for fugitive methane measurement over current practices. Methane concentrations vary significantly, both spatially and temporally, across a MSW landfill. However, current monitoring methods do not necessarily account for these sig...