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Description Of A Class Fire Extinguisher
766 wordsA fire extinguisher is a portable or movable apparatus used to put out a small fire by directing onto it a substance that cools the burning material, deprives the flame of oxygen, or interferes with the chemical reactions occurring in the flame. Water performs two of these functions: its conversion to steam absorbs heat, and the steam displaces the air from the vicinity of the flame. Many simple fire extinguishers, therefore, are small tanks equipped with hand pumps or sources of compressed gas ...
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Research And Development Peanut Butter
2,117 wordsOne does not need to look far to witness a variety of contributions to our everyday lives from the talented scientists and researchers, past and present, at Proctor & Gamble (P&G). At least one P&G product can be found in virtually every home in the United States, and the Company's products are in 140 countries worldwide. P&G credits its success in product innovation to deeply understanding consumer needs and desires then bringing these to life through cutting-edge science and technology. Every ...
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Method Of Execution Percent Of The Cases
2,050 words... d 42 percent of those awaiting execution on death row. This over-representation has long been the case and has been addressed by virtually every legislative body in America as well as by the Supreme Court. In the landmark case Furman Vs. Georgia in 1972 the Supreme Court overturned existing death penalty statutes on the grounds that those selected to die were chose primarily on the basis of race. In this case the Supreme Court issued a temporary moratorium on capital sentencing. The moratori...
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Amino Acids Dna Molecule
1,152 wordsIntroduction Deoxyribonucleic acid is contained in all cells. The structure of DNA makes gene transmission possible. Since genes are segments of DNA, DNA must be able to make exact copies of itself to enable the next generation of cells to receive the same genes. The DNA molecule looks like a twisted ladder. Each "side" is a chain of alternating phosphate and deoxyribose sugar molecules. The "steps" are formed by bonded pairs of purine-pyrimidine bases. DNA contains four such bases the purines a...
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Determining Ph Of Identical Strong And Weak Solutions
844 wordsExperiment: Determining pH of identical strong and weak solutions Date: 31 / 10 / 03 Aim: Plan and perform a first-hand investigation to measure the pH of identical concentrations of strong and weak acids. Equipment: Deionised water (H 2 O) Tartaric Acid (C 4 H 6 O 6) Citric Acid (C 6 H 8 O 7) Sulfuric Acid (H 2 SO 4) Acetic Acid (CH 3 COOH) Hydrochloric Acid (HCl) Ammonium Chloride (NH 4 Cl) Tap Water (H 2 O) Nitric Acid (HNO 3) Probe Ferric chloride (Fe Cl 3) Wash bottle Sodium Chloride in tap...
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Plasma Membrane Passive Transport
834 wordsBeing one of the most important components of a cell, the plasma membrane, or cell membrane plays a huge role in regulating how things get in and out of cells. The plasma membranes unique structure enables it to let only certain molecules pass through the cell. This ability is called selective permeability. Most of the plasma membrane in most cells is made up of a phospholipid bilayer with proteins either embedded into it or sticking out from either side of the membrane. The heads of the phospho...
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Permeable Membrane Semi Permeable
781 wordsOsmosis is the flow of water through a semi permeable membrane that blocks the transport of salts or other solutes through it. It is also defined as the net movement of water from an area of high concentration to a region of low concentration. Osmosis is a fundamental effect in all biological systems. When two water volumes are separated by a semi permeable membrane water will flow from the side of low solute concentration to the side of high solute concentration. If external pressure is applied...
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Molecular Biology Membrane Potential
1,317 words... that span the membrane. Class 5. Lipid Anchored These proteins undergo substitution with the carbohydrate groups of glycolipids, therefore binding covalently with the lipid. This classification is not definitive in including all proteins, since there may well be other examples that span the membrane with different numbers of anchor chains. The structure of proteins varies greatly. The first factor affecting structure is the proteins function, but equally important is the proteins location, a...
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Hydrogen Cyanide Chemical Weapon
605 wordsSo, what were the evidences, which supported the statement of the Judge Duffy, that there had been cyanide in the WTC bomb? The main question to be solved here lied in the following: what could be the consequences of mixing cyanide with nitric or sulfuric acids, both of which had been found in the bomb fragments? The FBI chemist Steven Burgmeister was the main person to be inquired about the results of the forensic chemical analysis. The thing is, that Burgmeister never made it clear, that he ha...
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Equipment For From Solutions And Melts
2,773 wordsEquipment for crystallization from solutions and melts The aim of the present work is to present the general knowledge about the equipment which now exists for crystallization from solutions and melts. The research will be based on the extensive study of the scientific literature and other related sources. It is necessary to consider the most important and widely spread kinds of equipment, looking at them from the viewpoint of easy data acquiring. Introduction To start with, it is necessary to d...
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Lowering Fat Intake Diet Safe And Toxic Foods Vegetables
762 wordsNutritious Diet In the 21 st century diets have been transformed by refrigeration, improved and faster transportation, advances in food preservation, and new farming methods that prolong the growing season and increase the yield per acre. As a result, foods are available more regularly, items purchased in one season can be frozen and consumed in another, and prices have become more competitive. There is the growing number of households in which all adults are employed, contributed to an increase...
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Saturated Fat Fast Food
386 wordsForty Burger Wars Burger Wars Forty million customers are served every day by Americas biggest hamburger chains McDonalds, Burger King, and Wendy's. In fact, many fast food restaurants are becoming an extension of the family kitchen. About two-thirds of all fast food is takeout, and most of that goes home. Some chains are beginning to put mobile units in unpredictable places such as Wal-Mart, hospitals, schools, and even gas stations. So, what is it about their burgers that attracts people to th...
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Plasma Membrane Molecular Biology
2,683 wordsWhat Are The Major Components Of Biological What Are The Major Components Of Biological Membranes And How Do They Contribute To Membrane Function? . What Are The Major Components of Biological Membranes And How Do They Contribute To Membrane Function? . Summary. The role of the biological membrane has proved to be vital in countless mechanisms necessary to a cells survival. The phospholipid bilayer performs the simpler functions such as compartment ation, protection and osmoregulation. The prote...
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X 10 S 1
1,147 wordsFluorescence Study of the Kinetics of Energy Transfer Between Dyes 1. Introduction Coumarin 1 and Sodium fluorescein are two dyes which absorb and emit light in the visible region. By using a spectrophotometer we are recording an absorption spectrum and then determining the molar decade absorption coefficients, which will be used later to interpret and analyse the fluorescence spectra. For fluorescence spectra, there are two kinds, the excitation and the emission spectrum. The excitation spectru...
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Saturated Fat Eating Disorders
506 wordsGood Nutrition for Teenagers This article is about a good nutritional diet for growing teenagers. It is very important for teens to eat a certain amount of a certain type of food each day. When girls are almost done fully growing, they start to add some fat padding. But for boys, they begin to gain muscle and increasing the volume of blood. These changes often encourage girls to diet so that they will stay slim. Boys end up overeating to satisfy their appetites. Both of these could end up leadin...
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Thomas Alva Edison Fiber Optic
2,291 wordsHave you wondered why streetlights are yellow, or why the year 2000 cars have brighter headlights and they are a different color? Have you ever wondered how the indiglo light on your watch works, or why it glows green and not white? And did you know that same indiglo light can be used while frozen, dipped in water, bent in half, stepped on, or in hazardous environments. Lighting has changed over the last few years; there are advantages and disadvantages of different kinds of lighting. Lighting h...
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6 M K 2
229 wordsQualitative Analysis of Group IV Ions The composition of my unknown #J 10 is Barium, Calcium, and Sodium. Confirmation of Ba 2 +: After I added. 5 mL of 6 M acetic acid to the precipitate from step # 2 the solid dissolved. A yellow precipitate formed after adding 1 mL of water, 2 drops of 6 M NH 3, and. 5 mL 0 f 1 M K 2 CrO 4. This confirmed the presence of barium. Confirmation of Ca 2 +: I added 6 M sodium hydroxide to the orange solution from step three until it was basic (solution turned yell...
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School Age Children U S Department
2,405 wordsA visit to a school lunchroom at noon would quickly dispel any preconceived view of how lunch goes down in children. Most youngsters will dive for the cookies first eat a bite or two out of the sandwich and the apple, throw away the rest, and turn to the serious business of snack foods. There are approximately 25 million children in 93, 000 schools who receive breakfast and lunch through the school cafeteria. Although research has shown that eating healthy at an early age helps youngsters develo...
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Acid Rain Plant Growth
767 wordsPhosphates may be Untitled Phosphates may be created by substituting some or all of the hydrogen of a phosphoric acid by metals. Depending on the number of hydrogen atoms that are replaced, the resulting compound is described as a primary, secondary or tertiary phosphate. Primary and secondary phosphates contain hydrogen and are acid salts. Secondary and tertiary phosphates, with the exception of those of sodium, potassium and ammonium are insoluble in water. Tertiary sodium phosphate is valuabl...
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Room Temperature Small Amounts
1,195 wordsSilicon I. Introduction Silicon is a metalloid at room temperature with an atomic number of 14, 14 electrons, 14 neutrons, and an average atomic mass of 28. 0855. In its pure form silicon melts at 2, 570 degrees, and boils at 4, 271 degrees Fahrenheit. This element belongs to the metalloid family, the 14 th family on the periodic table of elements. This element is a solid metalloid at room temperature and turns to liquid at 2, 570 degrees. Silicon is prepared as a brown amorphous powder or as gr...
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