The Nitrogen Cycle Nitrogen fixation Atmospheric nitrogen must be processed‚ or "fixed" to be used by plants. Some fixation occurs in lightning strikes‚ but most fixation is done by free-living or symbiotic bacteria. These bacteria have an enzyme that combines gaseous nitrogen with hydrogen to produce ammonia‚ which is then further converted by the bacteria to make their own organic compounds. Conversion of N2 The conversion of nitrogen (N2) from the atmosphere into a form readily available
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Constance Whitney Warren’s bronze sculpture entitled‚ Equestrian Portrait of Diego Velazquez 1924 is located between the General Academic Building and the Physics Building at the University of North Texas Denton Campus. Gift of the Harlan crow family in 1994 but the reasons remain in mistery. The composition of the ten foot bronze sculpture was created inspired by the American West and specializing in bronze equestrian statues‚ portrays the famous Spanish painter Diego Velazquez who is riding a horse
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is expensive. The chemical kinetics of gas phase oxidation of ethanol has been reported over last five decades. Data have been reported from nonflow reactors‚ flow reactors‚ diffusion flames‚ and laminar premixed flames experiments by several researchers [2-5]. Detailed chemical kinetics models to describe the gas-phase oxidation of ethanol in air are available in literature [6]. Apart from that a global single step mechanism for ethanol oxidation is also available [7]. Experimental studies have
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Green gas | Dark red volatile liquid | Shiny black solid – sublimes to purple gas | Halide | Colour precipitate with silver nitrate | KCl | White | KBr | Cream | KI | Pale Yellow | Redox reactions ‘Reduction is gain of electrons‚ oxidation is loss of electrons’ Examples; Overall reaction = 2KBr + Cl₂ 2KCl + Br₂ Halogens get more reactive going up the group‚ and in redox reactions the less reactive element
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contains catalysts‚ which are called enzymes. These accelerate the reaction of biochemical reactions in the human body. In a catalytic converter‚ there are two types of catalysts inside. The first one is the reduction catalyst and the other is the oxidation catalyst. Both of the catalysts consist of a ceramic structure. The reduction catalyst is the first step of the catalytic converter. It uses platinum and rhodium to reduce the NOx emissions.
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solution 4. Start timing until the color disappear Results and Discussion: The fastest concentration of glucose to react with oxidation-reduction is the 1.0% concentration while the slowest to react is 0.1% concentration. Conclusion: I have therefore conclude that the higher the concentration of glucose‚ the faster disappearance of colour indicating the oxidation-reduction reaction. Questions: 1. Identify the possible source of error in the activity. a. Contamination that will alter
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be/Gh2P5CmCC0M Basic Key Concepts After completing the readings and practice exercises‚ students should be able to: Describe the two mechanisms of ATP synthesis. Describe the location‚ steps‚ and inputs and products of: glycolysis the oxidation of pyruvate the Krebs cycle Calculate the energy yield from glycolysis. Explain the fate of the electrons produced by the Krebs cycle. Describe the structure and function of the electron transport chain. Understand how the proton gradient connects
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general manager of Applied Research Technologies (ART) in the Filtration Unit Division‚ was tasked to re-launch a mini water-oxidation product. With this opportunity‚ Peter had firsthand knowledge of the two failed attempts in the last three years to bring this task to fruition with ART’s marketing department. Peter recognized the task of re-launching a successful mini water-oxidation product was a major challenge‚ however he recognized that his team had worked countless hours to make this project a reality
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passive diffusion (Rebouche‚ 2006). However‚ in tissues that rely on fatty acid oxidation‚carrier-mediated transport ensures high tissue-to-plasma concentration ratio. One author‚ Rebouche (2006) suggested that L-carnitine dissemination can be either into the muscle or into the liver‚ kidney and other tissue. According to Rigault et al. (2007)‚ L- carnitine is transferred to organs which metabolisms rely on fatty acid oxidation‚ particularly the heart and skeletal muscle. Oxidative stress weakens mitochondrial
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HKDSE CHEMISTRY – A Modern View (Chemistry) Coursebook 3 Suggested answers Chapter 25 Simple molecular substances with non-octet structures and shapes of simple molecules Page Number Class Practice 1 Chapter Exercise 2 Chapter 26 Bond polarity Class Practice 4 Chapter Exercise 5 Chapter 27 Intermolecular forces Class Practice 7 Chapter Exercise 9 Chapter 28 Structures and properties of molecular crystals Class Practice 11 Chapter Exercise 12 Part Exercise 14 Chapter 29 Chemical cells in daily life
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