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  • Precise Control of Dissolved O2 and N2 (.pdf)
    There is a trend in the semiconductor industry for precise control of oxygen and nitrogen concentrations in ultrapure water. Specifically there is a goal in the polishing loop of a semiconductor plant to control dissolved oxygen to low levels of 1 ppb or 5 ppb. At the same time it is important
  • Liqui-Cel (R) Membrane Contactors Improve Performance of Megasonic Cleaning (.pdf)
    in the system setup. First, a system containing Liqui-Cel Contactors could be located in the polishing loop. Here the typical dissolved gas requirement is less than 1 ppb for O2 and around 3 ppm for N2. Second, a Nitrogen blanketed tank could be located in the polishing loop. The typical dissolved
  • Spectroscopic Diagnostics of an Atmospheric Microwave Plasma
    for. molecular rotational and atomic excitation temperature (Trot, Texc) measurements are. being used for plasma studies. Initial chord averaged measurements have been made of. the N2. + (0,0) first negative system for Trot and Fe I levels for Texc in nitrogen and air. plasmas, respectively.

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  • Ecology of Cyanobacteria II
    These thick-walled cells, which are interspersed in filamentous taxa, are a highly-specific morphological and physiological adaptation to ambient oxic conditions, in that they harbour the oxygen-sensitive nitrogen ( N2 ) fixing .
  • The Prokaryotes
    Dinitrogen fixation, the biocatalytic conversion of gaseous nitrogen ( N2 ) to ammonium, is an exclusive property of prokaryotes.
  • Past and Present Water Column Anoxia
    The former involves the reduction of oxidized nitrogen [mainly nitrate (NO3 −)] to molecu- lar nitrogen ( N2 ) when O2 concentration falls close to zero, and the latter leads to the production of hydrogen sulphide (H2S) when the water is completely stripped of …
  • Genetics and Regulation of Nitrogen Fixation in Free-Living Bacteria
    The capacity to fix molecular nitrogen ( N2 ) is virtually universal among members of the purple nonsulfur bacteria but the efficacy of the process varies considerably among species (for a review, see Madigan, 1995).
  • Encyclopedia of Agrochemicals 3 Volume Set
    Nitrogen ( N2 ) left from the air reacts with the hydrogen over a nickel catalyst to give ammonia (NH3 ).
  • Development and Application of Optimal Design Capability for Coal Gasification Systems
    … as a Function of Temperature for Nitrogen (N2)............................................126 Figure 52 Regression Results for Temperature as a Function of Entropy for Nitrogen (N2)............................................126 Figure 53 Regression Results for Enthalpy as a Function of Temperature for Nitrogen ( N2 ) ..........................................126 Figure 54 Regression …
  • Encyclopedia of Astrobiology
    À ) are used as ▶ electron acceptors, which may ultimately produce molecular nitrogen ( N2 ) through a series of intermediate gaseous nitro- gen oxide products.
  • The Early Evolution of the Atmospheres of Terrestrial Planets
    The two principal gaseous components of Titan’s atmosphere are molecular nitrogen N2 (98.5% in stratosphere) and methane CH4 (1.4% in stratosphere) [1].
  • The Prokaryotes
    Dinitrogen fixation, the biocatalytic conversion of gaseous nitrogen ( N2 ) to ammonium, is an exclusive property of pro- karyotes, with only few of them having this capacity.
  • Nitrogen and phosphorus interact to control tropical symbiotic N 2 fixation: a test in Inga punctata
    Summary  Symbiotic di‐ nitrogen ( N2 ) fixation is a critical biogeochemical process in tropical forests, yet it remains unresolved how fixation is controlled by the availability of soil nitrogen and phosphorus, two nutrients often considered limiting in terrestrial ecosystems.