scholarly journals Biochemistry of nitrogen fixation in free-living organisms

1968 ◽  
Vol 109 (2) ◽  
pp. 2P.2 ◽  
Author(s):  
M G Yates
Keyword(s):  
Nitrogen Fixation ◽  
Free Living ◽  
Living Organisms

Nitrogen fixation and acetylene reduction in decaying conifer boles: effects of incubation time, aeration, and moisture content

1982 ◽  
Vol 12 (3) ◽  
pp. 646-652 ◽  
Author(s):  
Warwick B. Silvester ◽  
Phillip Sollins ◽  
Thomas Verhoeven ◽  
Steven P. Cline
Keyword(s):  
Nitrogen Fixation ◽  
Moisture Content ◽  
Forest Ecosystem ◽  
Acetylene Reduction ◽  
Preliminary Survey ◽  
Anaerobic Conditions ◽  
Free Living ◽  
Living Organisms ◽  
Low Activity

Free-living microaerophiles fixed 15N2 and reduced acetylene in fallen tree boles at two old-growth Pseudotsugamenziesii stands in western Oregon. Acetylene reduction was most rapid under an atmosphere of 2–10% O2, whereas under prolonged anaerobic conditions it was at or below detection limits. Acetylene reduction rates increased up to fourfold during long-term incubations in acetylene (> 12 h). Ratios of acetylene reduction to N2 fixation frequently exceeded 6.0 during such long-term incubations but averaged 3.5 when samples were incubated < 7 h; consequently, long-term incubation of low-activity material in acetylene should be avoided. A preliminary survey indicated that N2 fixation by free-living organisms in fallen boles was less than other potential N inputs to fallen boles and to the forest ecosystem.

scholarly journals Regulation of nitrogen fixation from free-living organisms in soil and leaf litter of two tropical forests of the Guiana shield

2019 ◽  
Vol 450 (1-2) ◽  
pp. 93-110 ◽  
Author(s):  
Leandro Van Langenhove ◽  
Thomas Depaepe ◽  
Sara Vicca ◽  
Joke van den Berge ◽  
Clement Stahl ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Leaf Litter ◽  
Tropical Forests ◽  
Guiana Shield ◽  
Free Living ◽  
Living Organisms

Expression of the nodulation and nitrogen fixation genes in Rhizobium meliloti during development

Genome ◽  
1989 ◽  
Vol 31 (1) ◽  
pp. 354-360 ◽  
Author(s):  
San Chiun Shen ◽  
Shui Ping Wang ◽  
Guan Qiao Yu ◽  
Jia Bi Zhu
Keyword(s):  
Nitrogen Fixation ◽  
Rhizobium Meliloti ◽  
Abnormal Development ◽  
Wild Type ◽  
Free Living ◽  
Nod Genes ◽  
Nodule Initiation ◽  
Fix Genes ◽  
Nitrogen Fixation Genes

Genes that specify nodulation (nod genes) are only active in the free-living rhizobia or in the nodule initiation state of rhizobia. As soon as the repression of nod genes occurs in the bacteroids of the nodule, nifA is induced, while ntrC is inactivated and thus the nifA-mediated nif/fix genes are turned on. Limitation of available oxygen brings about the induction of nifA, which reflects the actual status of nif/fix gene activities in symbiotic state of rhizobia. Oxygen thus appears to be a major symbiotic signal to the expression of bacteroid nif/fix genes. Mutation of nifA or shortage of nifA product in wild-type rhizobia caused by the inhibition of multicopy nifH/fixA promoters leads to an abnormal development of nodules and premature degradation of bacteroids in nodules.Key words: nitrogen fixation, nodulation, nif/fix regulation, nifA mutant.

scholarly journals An open‐source sensor‐logger for recording vertical movement in free‐living organisms

2017 ◽  
Vol 9 (3) ◽  
pp. 465-471 ◽  
Author(s):  
J. Ryan Shipley ◽  
Julian Kapoor ◽  
Richard A. Dreelin ◽  
David W. Winkler
Keyword(s):  
Open Source ◽  
Vertical Movement ◽  
Free Living ◽  
Living Organisms

scholarly journals Recent Advances in Biological Nitrogen Fixation

Agronomy ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1941
Author(s):  
Jerzy Wielbo
Keyword(s):  
Nitrogen Fixation ◽  
Biological Nitrogen Fixation ◽  
Recent Advances ◽  
Living Organisms ◽  
Biological Nitrogen

Nitrogen is essential for the growth and functioning of all living organisms; however, only 2% of Earth’s nitrogen is available for them [...]

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