Biosynthesis and Biofunctions of Iron-sulfer proteins Yiming Chen‚ Brown University‚ May 11th‚ 2011 I. Introduction Iron-sulfur proteins are the proteins which contain iron-sulfur clusters‚ like sulfide-linked di-‚ tri-‚ and tetrairon centers with various oxidative states 1. An excess of 120 distinct types of enzymes and proteins are known to contain Fe-S clusters2. Iron-sulfur proteins are known for the role of the oxidation-reduction reactions of mitochondrial electron transportation. They are also
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The element I chose is Sulfur. Sulfur’s symbol is S‚ and it’s in the Chalcogen family. Sulfur has a lot of roles to play in our bodies. It’s also one of the abundant elements in our bodies with a mass percentage of 0.2. Sulfur’s atomic number is 16‚ and its Mass number is 32.066. In addition‚ Sulfur is a non-metal. Sulfur has multiple physical and chemical properties; one of the physical properties is that Sulfur is insoluble in water. A chemical property for Sulfur is that it’s a very reactive element
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It is ‘thiazolidine-2‚4-dione’ and not thiohydantoins as the reaction product of monosubstituted thioureas and chloroacetylchloride a a a a a The reaction products of monosubstituted phenylthioureas with chloroacetylchloride in a polyethylene glycol (PEG-400) medium and K2 CO3 as base/catalyst at an elevated temperature are exclusively thiazolidine-2‚4-diones and not thiohydantoins as has been reported. The core unit thiazolidine-2‚4-dione is essentially derived from chloroacetylchloride
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yarns‚ paper‚ and textile fabrics”. There are many kinds of bleaches in the market contains different kinds of chemicals such as S and Cl‚ and they’re the two elements I am going to focus on introducing today. PPT 4 Firstly‚ it comes to sulfide bleach. The compound which is actually making the process is SO2‚ the oxide of S element. SO2 is a colorless‚ irritating-smell and toxic gas under S.T.P. and is released by volcanoes and in various industrial processes. Have you guys ever had the chance
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accurate balance. Sulfur can be determined gravimetrically. Sulfur is found in minerals such as iron pyrite‚ gypsum and coal. Coal may contain as much as 4% sulfur in various forms: pyritic sulfur (as S 2 2-)‚ sulfur in sulfates (as SO42-) and in a variety of organic forms‚ such as thiophenols and thiophenes. When coal with high sulfur content is burned sulfur dioxide is formed which is a major primary air pollutant. Obviously the value of coal as a fuel decreases as the sulfur content increases
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keep it simple science Ryde Secondary College‚ SL#710371 INDUSTRIAL CHEMISTRY What is this topic about? To keep it as simple as possible‚ (K.I.S.S.) this topic involves the study of: 1. THE CHEMICAL INDUSTRY 2. CHEMICAL EQUILIBRIUM 3. PRODUCTION OF SULFURIC ACID 4. PRODUCTION OF SODIUM HYDROXIDE 5. SOAP & DETERGENTS 6. THE SOLVAY PROCESS FOR Na2CO3 ...all in the context of the applications of Chemistry in human society. 1. THE CHEMICAL INDUSTRY The “Invisible” Industry Most people are familiar
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Observation of Different Photons when Elements are Heated Introduction: The bright line spectrum is the range of colorful lights that are emitted from an atom in its excited state. A “normal” atom‚ or an atom in its ground state‚ is when all of the atom’s electrons are in their proper energy level. When an atom is in its excited state‚ electrons jump to different energy levels making them unstable. As the electron tries to get back to its respective energy level‚ energy is emitted in the form
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2HAB=?A Finite Element Analysis was developed as a numerical method of stress analysis‚ but now it has been extended as a general method of solution to many complex engineering and physical science problems. As it involves lot of calculations‚ its growth is closely linked with the developments in computer technology. Now-a-days a number of finite element analysis packages are available commercially and number of users is increasing. A user without a basic course on finite element analysis may produce
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INTRODUCTION PROFILE OF NATIONAL FERILIZERS LIMITED NFL‚ incorporated in 1974 is India ’s largest Central Public Sector Enterprise in Fertilizers Sector with a turnover of over Rs. 7300 cores and an overall annual installed capacity of 32.31 lakh tones of Urea. NFL has five Urea plants located at Nangal & Bathinda in Punjab‚ Panipat in Haryana and Vijaipur I & II plants in Madhya Pradesh. Apart from producing Urea‚ NFL is also engaged in manufacturing & marketing of Industrial products‚ trading
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Acid rain is mostly caused by human emissions of sulfur and nitrogen compounds which react in the atmosphere to produce acids. In recent years‚ many governments have introduced laws to reduce these emissions. Emissions from volcanoes and those from biological processes that occur on the land‚ in wetlands‚ and in the oceans account for the contribution of the pricipal natural phenomena of acid-producing. However‚ the principal cause of acid rain is sulfur and nitrogen compounds from human sources‚ such
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