Sentences with phrase «with microbial activity»

Even when a prime, rock - free site is found, samples can be contaminated with microbial activity or by modern air that seeps in when temperature changes cause the ice to crack.

Not exact matches

They identified microbial genes and their activity with help from DOE's Joint Genome Institute in Walnut Creek CA.

Depth horizons with functional genes indicative of methane - cycling and sulfate - reducing microorganisms are enriched in solid - phase sulfur and total organic carbon, host δ13C - and δ34S - isotopic values with a biological imprint, and show clear signs of microbial activity when incubated in the laboratory.

Multiyear incubation experiments with samples of host rock confirmed the microbial activities measured in situ.

Unlike microcrystals, for example, the tubules have complex forms — often observed abruptly changing direction to avoid intersecting each other, in a manner consistent with tunneling microbial behavior — and contain organic molecules associated with biological activity; the Ries tubules are also similar to fossil traces of microbes found in volcanic glass.

They sent soil samples for DNA testing, looking for matches with particular genes known to be found in microbes and fungi; they tried to stimulate microbial growth on a wide variety of substances and then count the cells produced; and they used highly sensitive radiorespiration activity assays, which involve feeding the soil microorganisms a food source which has been labelled with radioactive carbon, which can then be used to detect if the microorganisms are active.

Given that the tubules seem to be associated with fractures and water - cooled margins within the rocks, the researchers propose that hydrothermal activity — the local circulation of heated water, common after impacts — could have allowed microbial colonization of the glass from the surrounding environment.

While a core microbiota of the same bacteria was present in all areas of the mock - up spacecraft, the authors noticed specific bacterial signatures for each individual area, or module, indicating that — much like in other indoor environments — microbial presence is associated with human presence as well as the type of activity that an area is used for.

In an email interview with Newsweek, lead author Gaël Choblet, from the French National Center for Scientific Research, said that while he can not speculate on the presence of alien life on Enceladus, their timescale for hydrothermal activity does bolster the case that microbial life could emerge.

Recent research shows that there is high microbial activity on glacial surfaces (Anesio et al., 2009), some associated with pigmented algae, which absorb significantly more light than local inorganic dust particles on the Greenland Ice Sheet (GrIS)(Lutz et al., 2014).

IgG and IgA with potential microbial - binding activity are expressed by normal human skin epidermal cells.

The research has led to three important findings: 1) in situ bioremediation of uranium is possible, 2) uranium reduction activity at this site is associated with microbial iron reduction and appears to decrease with the onset of sulfate reduction, and 3) some uranium removal activity appears to persist long after acetate injections cease.

Microbiologist, Dr. Jason Sylvan, Assistant Professor of Oceanography, Texas A&M University, who samples microbes from the depths of ocean, measures microbial enzyme activity using the portable Spark ® microplate reader by Tecan that he carries with him on the ship.

At Mauna Loa, the correlation coefficient was 0.62, with negligible probability that the coefficient is zero, at Macquarie Island, Southern Ocean, correlation 0.73, negligible probability that the coefficient is zero, at Izanz, Tenerife, correlation 0.54, negligible probability that the coefficient is zero, at Ascension Island, correlation 0.48, negligible probability that the coefficient is zero, at Cape Ferguson, NE Australia, correlation 0.29, minute probability that the coefficient is zero but metal smelters operating in the vicinity, at Barrow, Alaska, correlation 0.54, small probability that the coefficient is zero, at Cape Kumukahi, Hawaii, correlation 0.67, minute probability that the coefficient is zero, at Cape Grim, NW Tasmania, correlation 0.64, negligible probability that the coefficient is zero, at Casey Base, Antarctica, correlation 0.19, 2 % probability that the coefficient is zero, temperature too cold for microbial activity?

CO2 uptake by plant and soil microbial activity will respond very rapidly with sufficient heat and solar.

Phytoplankton prefer to consume nitrate with lighter oxygen and nitrogen isotopes, so they leave behind heavier isotopes; measuring these can reveal microbial activity in the environment.