Cyanobacteria is a remarkable group of prokaryotic photosynthetic microorganisms, with several genera capable of fixing atmospheric nitrogen (N2) and presenting a wide range of morphologies. Although the nitrogenase complex is not present in all cyanobacterial taxa, it is spread across several cyanobacterial strains. The nitrogenase complex has also a high theoretical potential for biofuel prod...

Agricultural yields are often limited by nitrogen (N) availability, especially in countries of the developing world, whereas industrialized nations application chemical N fertilizers has reached unsustainable levels that have resulted severe environmental consequences. Finding alternatives to inorganic is critical for sustainable and secure food production. Although gaseous (N2) abundant atmosp...

K,ZNA, T. M., and J . D. TJEPKEMA. 1978. Nitrogen fixation associated withScirprrs trtral.i~.etl.s and other nonnodulated plants in Massachusetts. Can. J . Bot. 56: 26362640. Nitrogen fixation was measured using the acetylene reduction technique in soil cores of 13 nonnodulated. herbaceous plant species growing in mesic and wetland habitats. Six species that grew in a well-drained portion of an...

Biological nitrogen fixation (BNF) plays a vital role in supply agricultural ecosystem but is generally impaired by fertilization. Understanding the trade-off between fertilization and BNF, underlying mechanisms are essential to optimize management for sustainable agriculture production. In this study, we examined potential rate of asymbiotic N2 fixation, nifH gene abundance, composition co-occ...

We performed integrated modelling of the chemical pathways formation for boron nitride nanotube (BNNT) precursors during high-temperature synthesis in a B/N2 mixture. Modelling includes quantum chemistry, quantum-classical molecular dynamics, thermodynamic, and kinetic approaches. It is shown that BN compounds are formed interaction N2 molecules with small clusters (N2 molecule fixation) rather...

Paradoxically, symbiotic dinitrogen (N2 ) fixers are abundant in nitrogen (N)-rich, phosphorus (P)-poor lowland tropical rain forests. One hypothesis to explain this pattern states that N2 fixers have an advantage in acquiring soil P by producing more N-rich enzymes (phosphatases) that mineralise organic P than non-N2 fixers. We assessed soil and root phosphatase activity between fixers and non...

Maize roots can be colonized by free-living atmospheric nitrogen (N2)-fixing bacteria (diazotrophs). However, the agronomic potential of non-symbiotic N2-fixation in such an economically important species as maize, has still not been fully exploited. A preliminary approach to improve our understanding of the mechanisms controlling the establishment of such N2-fixing associations has been develo...

The exploitation of the soybe an [Glycine max (L.) Merr.] -Bradyrhizobium japonicum symbiosis in varied environments requires an understanding of factors that may affect fixed and soil N assimilation. Temperature affects both soybean maturity and N requirement, and soil N availability. Five soybean varieties belonging to four maturity groups (00, IV, VI, and VIII) and their respective nonnodula...