• perchlorate
  • The hydrogen autoignition temperature, the temperature of spontaneous ignition in air, is 500 °C (932 °F). Pure hydrogen-oxygen flames emit ultraviolet light and with high oxygen mix are nearly invisible to the naked eye, as illustrated by the faint plume of the Space Shuttle Main Engine, compared to the highly visible plume of a Space Shuttle Solid Rocket Booster, which uses an ammonium perchlorate composite. (wikipedia.org)
  • peroxide
  • Seminal concepts within the family of peroxide and free radical scavenging enzymes can be traced to Oskar Loew's pioneering description of "catalase", a heme-containing enzyme with the "power of catalyzing hydrogen peroxide" [ 13 , 19 ]. (hindawi.com)
  • He also presciently wrote "One of the functions of this enzyme appears to be to prevent any accumulation of hydrogen peroxide which might be formed as a by-product in the series of energetic oxidations that characterize the cellular respiration process. (hindawi.com)
  • Hydrogen peroxide is a poison for the living protoplasm, hence the activity of catalase is of vital importance. (hindawi.com)
  • reactive
  • Now, new satellite technology has revealed that precursors of ozone - reactive nitrogen and methane pollution - travel across continents and oceans, and the toxic reach extends into the most remote and rural places. (scienceblogs.com)
  • Reactive oxygen species include a number of molecules that damage DNA and RNA and oxidize proteins and lipids (lipid peroxydation). (jove.com)
  • electron
  • The ground state energy level of the electron in a hydrogen atom is −13.6 eV, which is equivalent to an ultraviolet photon of roughly 91 nm wavelength. (wikipedia.org)
  • The energy levels of hydrogen can be calculated fairly accurately using the Bohr model of the atom, which conceptualizes the electron as "orbiting" the proton in analogy to the Earth's orbit of the Sun. However, the atomic electron and proton are held together by electromagnetic force, while planets and celestial objects are held by gravity. (wikipedia.org)
  • A more accurate description of the hydrogen atom comes from a purely quantum mechanical treatment that uses the Schrödinger equation, Dirac equation or even the Feynman path integral formulation to calculate the probability density of the electron around the proton. (wikipedia.org)
  • Of interest are Stark-broadened atomic lines of the hydrogen Balmer series to infer electron density. (jove.com)
  • atom
  • It is a cyclic ether and the simplest epoxide: a three-membered ring consisting of one oxygen atom and two carbon atoms. (wikipedia.org)
  • As the only neutral atom for which the Schrödinger equation can be solved analytically, study of the energetics and bonding of the hydrogen atom has played a key role in the development of quantum mechanics. (wikipedia.org)
  • carbon
  • Anaerobic oxidation of methane (AOM) coupled to sulfate reduction is a microbially mediated unique natural phenomenon with an ecological relevance in the global carbon balance and potential application in biotechnology. (feedage.com)
  • At the end of the MBR operation (day 726), the enriched biomass was incubated with 13C labeled methane, 13C labeled inorganic carbon was produced and the AOM rate based on 13C-inorganic carbon was 1.2 μmol.gdw−1.d−1. (feedage.com)
  • The relative instability of the carbon-oxygen bonds in the molecule is revealed by the comparison in the table of the energy required to break two C-O bonds in the ethylene oxide or one C-O bond in ethanol and dimethyl ether: This instability correlates with its high reactivity, explaining the ease of its ring-opening reactions (see Chemical properties). (wikipedia.org)
  • The visible orange flames in that incident were the result of a rich mixture of hydrogen to oxygen combined with carbon compounds from the airship skin. (wikipedia.org)
  • Recently, we reported interesting results where this interaction of molecular oxygen with a certain part of the existing stable radical structure can be reversibly affected simply by flowing a diamagnetic gas through the carbon samples at STP 7 . (jove.com)
  • molecular oxygen
  • We then use double mixing settings where A f SidA is first anaerobically reduced by NADPH for a designated period of time in an aging loop, and then reacted with molecular oxygen in the observation cell ( Figure 1 ). (jove.com)
  • It is also known that paramagnetic molecular oxygen undergoes a Heisenberg spin exchange interaction with stable radicals that extremely broadens the EPR signal 4-6 . (jove.com)
  • form
  • In plants, cyanides are usually bound to sugar molecules in the form of cyanogenic glycosides and serve the plant as defense against herbivores . (newworldencyclopedia.org)
  • In ionic compounds, hydrogen can take the form of a negative charge (i.e., anion) when it is known as a hydride, or as a positively charged (i.e., cation) species denoted by the symbol H+. (wikipedia.org)
  • field
  • In order to expand the scope of its usage, graphene hybrids which combine the synergetic properties of graphene along with metals/metal oxides and other nanostructured materials have been synthesized and are a widely emerging field of research. (frontiersin.org)
  • Unraveling the physiological functions of multiple NODs with varying expression in organisms and the complexity of NO as both a poison and signaling molecule remain grand challenges for the NO field. (hindawi.com)
  • surface
  • As a toxic gas that leaves no residue on items it contacts, ethylene oxide is a surface disinfectant that is widely used in hospitals and the medical equipment industry to replace steam in the sterilization of heat-sensitive tools and equipment, such as disposable plastic syringes. (wikipedia.org)
  • production
  • Sulfide production with simultaneous sulfate reduction was in equimolar ratio between days 480 and 585 of MBR operation, whereas methane consumption was in oscillating trend. (feedage.com)
  • Most hydrogen is used near the site of its production, the two largest uses being fossil fuel processing (e.g., hydrocracking) and ammonia production, mostly for the fertilizer market. (wikipedia.org)