Significant advances in the ecology, physiology and genetics of reductively dechlorinating bacteria have revealed their important environmental roles in bioremediation and in the global chlorine cycle. N2 fixation has been widely observed in symbiotic, associative and free-living bacteria. Here we show physiological and molecular evidence that reductively dechlorinating bacteria are capable of ...

Nitrogen (N) is one of the elements most needed by plants and widely distributed in nature. fixation can occur symbiotic or non-symbiotic soil microbes. This research aimed to examine potential N-fixing microbes increasing availability N soil. was conducted at Soil Biology Laboratory Faculty Agriculture, Universitas Sumatera Utara. The results showed that ability increase varied. population bac...

In recent years soil bacteria of the genus Azospirillum found increasing biological and ecological interest because of their ability to microaerobically fix N 2 and to live in close association with plant roots, stimulating growth of nitrogenlimited plants [1-5]. The physiology of N 2 fixation, especially its repression by N H + , has been studied extensively [6-9]. The question, however, how N...

Primary production in coastal waters is generally nitrogen (N) limited with denitrification outpacing nitrogen fixation (N2-fixation). However, recent work suggests that we have potentially underestimated the importance of heterotrophic sediment N2-fixation in marine ecosystems. We used clone libraries to examine transcript diversity of nifH (a gene associated with N2-fixation) in sediments at ...

During the winter of 2006 we measured nifH gene abundances, dinitrogen (N(2)) fixation rates and carbon fixation rates in the eastern tropical and sub-tropical North Atlantic Ocean. The dominant diazotrophic phylotypes were filamentous cyanobacteria, which may include Trichodesmium and Katagnymene, with up to 10(6) L(-1)nifH gene copies, unicellular group A cyanobacteria with up to 10(5) L(-1)n...

cyanobacteria were collected and identified in five paddy fields with different soil textures of golestan province in iran. it was determined that nostoc ellipsosporum and nostoc muscorum were dominant in all sites among 20 species. to assess the ability of atmospheric nitrogen fixation by the species, their pure cultures were provided by growing on bg-11 solid culture medium. subsequently, eac...

Nitrogen Fixation. In their Communication (e202307101), Guillermo C. Bazan et al. developed a new strategy to enable light-driven nitrogen fixation in non-photosynthetic bacteria by integrating the novel conjugated oligoelectrolyte into Azotobacter vinelandii.

salinity is among important soil stresses adversely affecting the process of nitrogen (n) fixation in leguminous plants in different parts of the world. it has been indicated that salinity can inhibit the early stages of nodulation process between bacterium and the host plant including the exchange of signal molecules (nod gene inducers). there has not been any research regarding the effects of...

The Calvin-Benson-Bassham cycle (Calvin cycle) catalyzes virtually all primary productivity on Earth and is the major sink for atmospheric CO(2). A less appreciated function of CO(2) fixation is as an electron-accepting process. It is known that anoxygenic phototrophic bacteria require the Calvin cycle to accept electrons when growing with light as their sole energy source and organic substrate...