Sentences with phrase «on nitrogen fixation»

Assisted a Ph.D. of Agricultural Microbiology with collecting data on nitrogen fixation in corn and soybean plots.

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.

«It has been established that the nitrates, which is a form of nitrogen, comes from fixation of atmospheric diatomic nitrogen in the atmosphere during meteorite impacts, which is consistent with the data that we obtained through the SAM analyses, so this may be the main source of fixed nitrogen on Mars,» says Javier Martín - Torres.

The researchers think volcanic lightning or the heat of ancient impacts on Mars» surface were responsible for nitrogen fixation on the Red Planet.

They focus on modifications with nitrogen, developing a technique with direct nitrogen fixation, carbon - nitrogen bond formation, at the broken edges of graphite frameworks using ball - milling graphite in the presence of nitrogen gas.

Based on the abundance of these cyanobacteria and the rate at which they gobble down radioactive nitrogen in the laboratory, the researchers estimate they account for about 10 % of nitrogen fixation in the ocean.

The process is called nitrogen fixation, and it occurs in microorganisms on the roots of plants.

Thus, in addition to the so - called «Haber - Bosch process of nitrogen fixation,» nitrogenase also stimulates a reaction corresponding to the «Fischer - Tropsch synthesis of hydrocarbons,» which can be used on a large scale to synthesize fuels, for instance from industrial waste gases..

The researchers found that the organisms turned on three genes for an enzyme called nitrogenase, which aids nitrogen fixation.

Orly Levitan, an author of what may have been the first study of acidification boosting nitrogen fixation, says she would consider changing her seawater recipe based on the new paper if she were to revisit this work.

And if the cyanobacteria are growing in water short on iron, an essential nutrient for them, the slowdown in nitrogen fixation can overwhelm any positive growth effects from extra CO2.

In soy and other legumes nitrogen fixation is an evolved trait allowing them to hold on to the element and return it to the soil.

Marilyn Roossinck of Pennsylvania State University, University Park, spoke with Sarah Crespi about the diversity of roles that viruses take on in ecological systems, from protecting plants from drought to moderating nitrogen fixation.

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.

The analysis focused on the genes involved in nitrogen fixation and the formation of heterocysts, which are special cells where atmospheric nitrogen is converted into ammonia.

«More than 60 genes involved in various processes of heterocyst formation and nitrogen fixation were assigned to the chromosome based on their similarity to the reported genes,» Kaneko's team writes in Genome Research.

He is specialized in the ecology and diversity of cyanobacteria, other marine bacteria and microalgae, and known for his work on microbial mats and nitrogen fixation

Unfortunately, most of the soybeans now grown are «roundup ready» and the high levels of roundup sprayed on the crop greatly diminishes the amount of bacterial nitrogen fixation.

It needs to be replaced with natural leguminous nitrogen fixation or the expanded population will find itself trying to live on one third of present agricultural productivity as oil production passes its peak.

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Limited direct impacts of atmospheric CO2 on nitrogen - fixation have been found in soil biological crusts (Billings et al., 2003), but soil microbial activity beneath shrubs has been observed to increase, thus reducing plant - available nitrogen (Billings et al., 2002).

Also, the impact of biological nitrogen fixation on N2O emissions is important in assessing the impact of cropping system changes.

Recent projects have focused on understanding the controlling mechanisms for coccolithophore ecology, marine nitrogen fixation and the spread of anoxic conditions during Oceanic Anoxic Events of the Mesozoic.