Sentences with phrase «nitrogen fixation by»

They contain chemical evidence for nitrogen fixation by microbes.

For more than a decade, a lone researcher has been building a case for nitrogen fixation by bacteria living in poplar leaves.

Applications considered in the process included bio-mining; nitrogen fixation by engineered crops; gene drive propagation in populations of invasive species; and engineered seeds and plants destined for distribution to the public.

Not exact matches

The ban on synthetically - produced mineral nitrogen in organic agriculture confines the productivity to the natural system limits (i.e. N - fixation) or the limits defined by the annual nutrient balance of the farm, including imported fodder and organic fertilizers.

The Brookhaven - made nitrogen isotope enabled direct quantification of biological nitrogen fixation and provided evidence for biological transport and metabolism by the host plant.

And it is known that fixation of nitrogen from the air is in the tundra to a high degree performed by cyanobacteria associated with mosses.

The biggest customer by a large margin, the colonial bacteria Trichodesmium, accounts for only one - tenth of known nitrogen fixation.

Under the tutelage of geneticist Frederick Ausubel, Ruvkun earned a Ph.D. in microbial genetics in 1982 by figuring out how to knock out nitrogen - fixation genes in Rhizobium meliloti, a bacterium that has a symbiotic relationship with alfalfa.

This anthropogenic addition of nitrogen has reached a magnitude comparable to about half of global ocean nitrogen fixation (the natural process by which atmospheric nitrogen gas becomes a useful nutrient for organisms).

1968 Robert Harza Burris for his continued contribution to knowledge of the metabolism of nitrogen and its fixation by plants

Possible mechanisms include (iv) fertilization of phytoplankton growth in the Southern Ocean by increased deposition of iron - containing dust from the atmosphere after being carried by winds from colder, drier continental areas, and a subsequent redistribution of limiting nutrients; (v) an increase in the whole ocean nutrient content (e.g., through input of material exposed on shelves or nitrogen fixation); and (vi) an increase in the ratio between carbon and other nutrients assimilated in organic material, resulting in a higher carbon export per unit of limiting nutrient exported.

Furthermore, those yields will increase without the addition of soil N fertilizer, as the results of this study clearly show that it was a CO2 - induced stimulation of nitrogen - fixation by symbiotic bacteria that provided the nitrogen necessary to increase seed yields.»

Although nitrogen fixation is not just a gift of life — it has been estimated that 100m people were killed by explosives made with industrially fixed nitrogen in the 20th century's wars — its net effect has been to allow a huge growth in population.