Researchers have identified the activity of Silver NPs exerted the antibacterial effect in two steps. First‚ they changed the membrane potential and reduced adenosine triphosphate (ATP) synthase activities‚ thus reducing the metabolism process. Secondly‚ they declined the subunit of the ribosome for tRNA binding‚ thus collapsing its biological mechanism. At the same time‚ they proved to be less toxic to mammal cells [26]. Silver NPs with a small size and enhanced surface area produce some electronic
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twenty minerals needed in dietary intake to maintain health. Minerals are broken down into two categories; macrominerals and microminerals. Macrominerals are considered major minerals and include sodium‚ potassium‚ chloride‚ calcium‚ phosphorus and sulfur. Microminerals or trace elements are needed in smaller quantities and include iron‚ copper‚ zinc‚ selenium and iodine amongst others. Although trace elements are needed in smaller amounts‚ they are just as essential to health as major minerals.
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Penicillin V is a first-generation penicillin used to treat infections generally caused by gram-positive bacteria. Penicillin V consists of 16 carbons‚ 18 hydrogens‚ two nitrogen‚ five oxygens and a sulfur atom. The beta-lactam group is the ring composed of two nitrogen‚ a sulfur atom‚ and an oxygen double-bound to a carbon. Penicillin works by bursting a bacteria’s cell wall; this is done by inhibiting the proteins that link peptidoglycans together in the cell wall‚ which prevents the bacteria from
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of tons of pollutants. The level is usually given in terms of atmospheric concentrations or‚ for gases in terms of parts per million‚ that is‚ number of pollutant molecules per million air molecules. Many come from directly identifiable sources; sulfur dioxide‚ for example‚ comes from electric power plants burning coal or oil. Others are formed through the action of sunlight on previously emitted reactive materials. For example‚ ozone‚ a dangerous pollutant in smog‚ is produced by the interaction
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can happen in a variety of ways. When two oxygen atoms join O2 is formed‚ and when three oxygen atoms join O3 or ozone is formed. Both of these have different properties. Different atoms can also combine to form molecules. Hydrogen combines with sulfur to form H2S and hydrogen and oxygen also combine to form H2O. Dmitri Mendeleev’s Periodic table is based on atomic weight‚ whereas‚ the modern periodic table keeps the atomic number as the base. An atomic table arranges elements from left to
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Name Surname: Murat Şenzeybek Instructor’s Name: Nilgün Eker ING 102 CRN: 20122 March 22‚ 2012 HARMS OF GOLD MINING History of gold is as old as history of humanity. Gold has always been valuable and popular. Since it hardly loses its glitter and it never gets oxidized. However‚ obtaining gold is not an easy process. People have to use cyanide or some other harmful chemicals to acquire gold. Also after this process very harmful toxic wastes are occurred. Thus gold mining has drastic effects
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tarnish that forms over time on silverware and other silver objects.[1] Silver sulfide is insoluble in all solvents‚ but is degraded by strong acids. Silver sulfide features a covalent bond‚ as it is made up of silver (electronegativity of 1.98) and sulfur (electronegativity of 2.58). It is a component of classical qualitative inorganic analysis.[2] When formed on electrical contacts operating in an atmosphere rich in hydrogen sulfide‚ long filaments known as silver whiskers can form. Degrading wooden
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A RESEARCH ON AIR POLLUTION NOWADAYS PROF. MADYA ZAMRI ABDUL RAHMAN LECTURER FATIN ADAWIYAH MOHAMAD PAUZI 2007288974 HAFISHAH HALIM 2007288918 MAZMIR MAT NOH 2007288996 [pic] UNIVERSITI TEKNOLOGI MARA MALAYSIA 20 AUGUST 2007 TABLE OF CONTENT 1.0 ABSTRACT 3 2.0 INTRODUCTION 4 3.0 PROBLEM DEFINITION 5 4.0 METHOD OF SOLUTION 5 5.0 RESULT AND DISCUSSION 5 6.0 CONCLUSION 5 7.0 REFERENCES 5 8.0 APPENDIX 5 1. ABSTRACT In recent years‚ our environment
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What are some of the measures we can take to reduce global warming? Since there is already a great number of green house gases already trapped in the earth’s atmosphere the major effect of global warming can never really be completely eliminated. CFC’s stay in the atmosphere for literally hundreds of years‚ and therefore even if we were to stop all activities releasing greenhouse gases into the atmosphere there would still be a major heat load trapped in the earth’s atmosphere. Since we cannot
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It Smells Like Proteus vulgaris Microbiology Lab Report for Unknown Robert Bhowanidin MCB 2010L / Section 1290 October 24th‚ 2013 The following report will describe both my journey to find my unknown as well as the results that led to my discovery. Before I start‚ I will say that I am 100% positive that my unknown (which was #31) is none other than Proteus vulgaris. My data and the ensuing results from them simply cannot be disputed. From my first batch of results‚ Proteus vulgaris reared
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