| Papers [1-15] of 99 :: [Page 1 of 7] | | Go to page : 1 2 3 4 5 6 7 —> | Search results on "PURIFICATION METALS": |
|
|
Purification of Metals, 2006.
An analysis of the purification of metals from ores.
1,757 words (approx. 7.0 pages), 6 sources, MLA, $ 56.95
»
Click here to show/hide summary
Abstract
The paper describes how metals exist in the form of minerals in the earth's crust, a metal ore being a highly concentrated mineral form of the metal. The paper explains how extraction of metals from its ore depends upon the quality of the ore and that the ores obtained from the ground contain unwanted impurities called gangue. The paper discusses the various methods of extracting these impurities from the metal.
Table of Contents:
Concentration
a. Gravity Separation or Hydraulic Washing
b. Froth Flotation
c. Magnetic Separation
d. Chemical Separation
Roasting or Calcination
Reduction of Mineral to the Metal
a. Electrolytic Reduction
b. Chemical Reduction (Smelting)
c. Auto-reduction(Smelting)
Refining
From the Paper
In this method, a Wilfley table is used .It is a sloping table and its top is corrugated or riffled in the direction of the slope. The crushed ore is then placed on the top of this table, which is always kept vibrating. "Then water is made to flow across the table at right angles to the top. The lighter gangue particles are thrown upwards at every jerk and carried across the table by the stream of water, while the heavier ore particles move towards the bottom of the table. Thus separation takes place when the ore reaches the bottom. This method is useful for dense ores like Cassiterite (SnO2).
Hydraulic classifier."
| |
|
Isolation and Purification of Lysozyme, 2007.
This paper looks at an experiment in an enzyme purification lab for the purification of lysozyme.
2,117 words (approx. 8.5 pages), 5 sources, APA, $ 66.95
»
Click here to show/hide summary
Abstract
The writer explains that in this experiment, lysozyme was purified from egg white solution into 24 fractions using gel column chromatography. The writer points out that the odd-numbered fractions were then assayed in order to determine the enzymatic activity of lysozyme, while the even-numbered fractions were assayed for total protein content, using the Bradford protein assay procedure. The writer notes that lysozyme is one of the most well-known enzymes, being abundant in mucus, tears, and albumen (commonly known as egg white).
The writer concludes that the purification of lysozyme from egg white was only somewhat successful since the estimated value of the molecular weight, 14.25 kDa, is practically the same as the known weight of 14.3 kDa. However, the specific activity, calculated at 400 units/mg, was significantly less than the expected specific activity of 25 000 units/mg of protein.
Outline:
Abstract
Introduction
Materials and Methods
Results
Calculations
Discussion
Conclusion
From the Paper
"Lysozyme is itself composed of 129 amino acids, including four disulfide bridges and three sets of alpha helices. The enzyme's active site consists of a long groove that can hold as many as six polysaccharides. According to past experiments, specific activity of lysozyme from egg white is approximately 25 000 units/mg. This is the expected result for this experiment. However, one factor that influences the specific activity is the actual column and type of chromatography being used, since accuracy differs among the different types of chromatographies. Therefore, some are able to purify enzymes better than others, giving a more accurate specific activity. In addition to obtaining the specific activity, molecular weight of the enzyme can be determined by comparing the fraction in which most of the enzyme eluted with the fractionation range."
| |
|
Investing In Precious Metals, 2002.
An analytical and comparative assessment of four precious metals as investment vehicles.
1,575 words (approx. 6.3 pages), 23 sources, $ 55.95
»
Click here to show/hide summary
Abstract
Analytical and comparative assessment of four precious metals as investment vehicles. Gold, Palladium, Platinum, Silver. Factors for and against precioius metal investment compared with other investments. Optional investor strategies for investing in precious metals. Comparison of the performance of the four precious metals. Pricing and price volatility. Seven Exhibits.
From the Paper
"INVESTING IN PRECIOUS METALS: AN ANALYTICAL AND COMPARATIVE ASSESSMENT
Introduction
Over the past decade, precious metals have taken a back seat to securities as the preferred investment vehicle by the majority of investors. The slippage in preference among investors, however, does not necessarily mean that investing in precious metals is not a good strategy for some investors.
This research provides an analytical and comparative assessment of precious metals as an investment vehicle. This assessment covers four precious metals - gold, palladium, platinum, and silver. The presentation of the findings of the assessment is in three major sections, as follows: (1) a comparison of the performance of the four precious metals ..."
| |
|
Heavy Metals, 2006.
A discussion of one of the most common environmental pollutants, heavy metals, and its effects on human health.
1,800 words (approx. 7.2 pages), 4 sources, $ 71.95
»
Click here to show/hide summary
Abstract
This paper discusses the environmental and human health effects of heavy metal contamination. The paper examines the sources of the heavy metals, transport of the heavy metals and the solutions to heavy metal contamination.
From the Paper
"Heavy metals are one of the most common environment pollutants. They come from a wide range of sources. For example, in a recent study of heavy metal contamination in Sydney, R. Snowdon and G.F. Birch note, Soils across the entire Iron Cove catchment are enriched in Cu, Pb, and Zn, but are substantially elevated in the north-east part of area, probably due to the location of old houses, past industry, and the convergence of major roads and railway lines (Snowdon and Birch 336). From this statement it seems that heavy metals are released into the environment from a number of human activities."
| |
|
Marketing Plan for Water Purification in India, 2008.
A presentation of the issues affecting a marketing plan for a new water purification system for India.
2,240 words (approx. 9.0 pages), 8 sources, MLA, $ 69.95
»
Click here to show/hide summary
Abstract
This paper presents a marketing plan for a water purification system for use in India. The paper cites the need for this water purification system and enumerates the current problems in India with providing clean water. It also describes the competitors and risks to the system, pricing and distribution. Finally, the paper discusses advertising and budgetary issues.
Table of Contents:
Product Description and Introduction
Goals and Strategy
Target Market
Competitors/Risks
Pricing
Channels of Distribution
Advertising, Sales Plans, PR Plans
Budget for Three Years
Budget
Conclusion
From the Paper
"It has cost $600 million in R&D to develop the product, and set up manufacturing operations in India. Our operational costs will be another $100 million annually. We are working on a fixed cost of $30 per unit, and initially $15 for marginal cost for a profit of $5 for each unit. Our advertising cost will be $40 million per year. Our profit will be $5 each unit. However, we are anticipating a operating loss our first year setting our sales at 100million units. We will make up that loss over the year two years, making 2million which still puts us as a net loss for year two, but recouping our investment in year three, by selling 200,000 units (a 50,000 increase in sales each year) In year three, we will make $260 million, which will make up for our $16million loss in year one."
| |
|
Dowling Flexible Metals Company, 2005.
An analysis of the Dowling Flexible Metals Company diversification strategy.
900 words (approx. 3.6 pages), 0 sources, $ 35.95
»
Click here to show/hide summary
Abstract
This paper discusses the Dowling Flexible Metals Company case in which the Dowling company developed with relative rapidity from its beginnings in a small garage. The paper describes how they started out as a company fabricating dyes for making minor component metal parts for automobiles. When it was decided that diversification was necessary, so as not to be tied so closely to the automobile, the company started to expand into new markets with new metal products. The paper examines how the company now has problems that need to be addressed.
From the Paper
"The Dowling Flexible Metals Company developed with relative rapidity from its beginnings in a small garage. What started out as a company fabricating dies for making minor component metal parts for automobiles. When it was decided that diversification was necessary so as not to be tied so closely to the automobile, the company started to expand into new markets with new metal products. The company grew rapidly after that and in 1980 found itself with greater size, more debt, and a number of problems that had not been addressed during the period of growth. The immediate issue is to examine the company and to recommend how to make things run better."
| |
|
Stepwise Purification of Lactate Dehydrogenase, 2005.
A biochemistry paper which outlines the purification of lactate dehydrogenase using many standard biochemistry techniques.
1,857 words (approx. 7.4 pages), 5 sources, APA, $ 59.95
»
Click here to show/hide summary
Abstract
The paper begins by purifying beef heart and ends with a highly-quantitative analysis of the results of attempting to isolate the enzyme lactate dehydrogenase. It contains every aspect of a detailed biochemistry lab report. The paper contains complex quantitative analysis with supporting statistics. It also has scanned photographs of the gel electrophoresis.
From the Paper
"Lactate dehydrogenase (LDH) is a crucial enzyme that regulates lactate levels throughout the mammalian body. Proper LDH function is essential for a number of important biochemical pathways, including the Cori Cycle and glycolysis among others. Without it, the glycolytic cycle would come to a halt due to diminished nicotinamide adenine dinucleotide (NAD+) reserves, and the buildup of lactate would ultimately result in lactic acidosis-a potentially fatal affliction."
| |
|
Isolation and Purification of Muscle Proteins, 2008.
This paper discusses the isolation and purification of actin and myosin in skeletal myofibrils.
1,791 words (approx. 7.2 pages), 7 sources, APA, $ 57.95
»
Click here to show/hide summary
Abstract
The writer explains that in the set of experiments discussed in the paper, myosin and actomyosin were isolated and gradually purified from rabbit muscle myofibrils. The two proteins were initially precipitated together out of solution, in order to remove any impurities. Then, the two proteins could be separated from each other, by taking advantage of differential solubility. The writer notes that after each time they were re-suspended or redissolved, the solutions were centrifuged in order to further improve purity. Any solution containing the contractile proteins or ATP were kept on ice during the experiments, and stored in a freezer at all other times. The writer discusses that using the Bradford protein assay and the SDS-PAGE, the concentrations and weights of the purified proteins in the final solutions were measured. For all protein samples, no appreciable concentration of protein could be detected after diluting the samples by 100 times. However, the other two dilutions yielded normal results.
Outline:
Abstract
Introduction
Materials and Methods
Results
Discussion
From the Paper
"The head of the myosin is the part which interacts with the other molecules. Without ATP, the myosin head is bound tightly to the actin, called the rigor state. However, ATP weakens this interaction by opening a cleft in the myosin head and disrupting the actin-binding site. When the myosin head is free of actin, it hydrolyzes ATP to ADP. This causes a conformational change in the head that moves it to a new position, closer to the (+) end of the actin filament, (away from the origin site) where it reattaches. The dissociation of the phosphate from ATP also causes a conformational change, this time in the myosin head. As a result, myosin returns to its original state (the rigor state). Because myosin is still bound to actin, this conformational change exerts a force that causes myosin to move the actin filament. This is the power stroke. Essentially, contraction is a series of these power strokes by the actomyosin complex, the myosin head is moving along the actin filament through constant detachment and reattachment."
| |
|
Metal Toxicity, 2006.
This paper studies the link between heavy metal exposure and illness.
1,996 words (approx. 8.0 pages), 12 sources, MLA, $ 63.95
»
Click here to show/hide summary
Abstract
The paper introduces the research by explaining that with a greater understanding of biochemistry comes greater knowledge about the interactions between living cells and abiotic elements, especially metals. The paper examines the current movement in the field of medicine to link the fields of biochemistry and inorganic chemistry in order to achieve a greater understanding of abiotic stress. This increases our level of knowledge about the effects of chemical exposures. The paper details the goals of medicine to find out if there is a real connection between heavy metal exposure/toxicity and disease beyond that which has been traditionally believed. The paper quotes research that links cancer and even children's risk factor scores to high levels of toxic metals.
From the Paper
"In recent years there has also been a stress in alternative medicine to assess and treat heavy metal toxicity in patients with generalized symptoms and the allopathic medicine has made strides to find out if there is a real connection between heavy metal exposure/toxicity and disease beyond that which has been traditionally believed. Another goal in medicine is to create a better understanding of the importance of diagnostic tools currently used to assess heavy metal levels, one of which in the midst of great controversy being hair analysis, which according to modern medicine is an ineffective way to screen for heavy metal toxicity in the manner it is being performed in the alternative medical arena. (Frisch, and Schwartz) The most important stress has then been to create better ways to ensure reliability of diagnostic procedures among patients with known exposure to heavy metals so chelation therapies can be created that actually reduce the blood load for heavy metals."
| |
|
"Raging Bull" and "Full Metal Jacket", 2007.
This paper analyzes, compares and discusses the films "Raging Bull" and "Full Metal Jacket."
2,820 words (approx. 11.3 pages), 13 sources, MLA, $ 83.95
»
Click here to show/hide summary
Abstract
The paper discusses how the purpose of the film "Full Metal Jacket" is different than that of the film "Raging Bull." The paper explains that in "Full Metal Jacket" the creation of an atmosphere is essentially more important then the narrative or story itself, while in "Raging Bull" the narrative structure and the story of an individual's life is at the artistic center of concern. In this light, the paper highlights the differences between the films, such as the usage of background and support elements and different approaches to technical issues such as lighting, camera angles and editing.
Outline:
Introduction
Full Metal Jacket
Raging Bull
From the Paper
"An analysis of these two films reveals that there are obvious differences in terms of their usage of background and support elements, such as setting and decor, as well as different approaches to technical issues such as lighting and camera angles and editing. These aspects of cinematic art are inextricably related to the style of the director as well as to the aims and intentions of the film. In any successful film aspects such as setting and environment are artistically linked to the various thematic and ideological undercurrents in the film. Background and set for example can be as important as script and acting in conveying certain moment of insight and perception in a film like Full Metal Jacket, for example. Therefore various aspects such as scenic environment, decor and sound should be borne in mind. A comprehsive analysis of a film cannot neglect these aspects and they are often integral to the shape and narrative trajectory of the film as a whole."
| |
|
Metal Detectors, 2004.
This paper discusses metal detectors, the mainstays of building security.
1,115 words (approx. 4.5 pages), 5 sources, APA, $ 38.95
»
Click here to show/hide summary
Abstract
This paper explains that, since 9/11, countries with a high level of terrorism, such as Israel, use metal detectors, which were formerly used mainly in prisons, but are now used in airports and other public buildings. The author reports that there are three types of metal detectors in general use today, including walk-through, hand-held, and extended arm types. The paper relates that several newer technologies, such as back-scatter X-ray, millimeter wave analysis, and terahertz wave technology, are in various phases of development and deployment to supplement the basic equipment that has traditionally relied on magnetic induction fields and their interaction with electrically conductive and magnetically permeable materials.
From the Paper
"Most metal detectors utilize an electromagnetic field generated by passing an electric current through a wire coil. In the case of walk-through metal detectors, the electromagnetic field is projected in the form of a wall between the borders formed by the equipment; hand-held devices project a circular field surrounding the length of the device. In the case of walk through detectors, subjects (and any potential targets) pass completely through the electromagnetic field, whereas hand-held devices are employed by passing them close enough to potential targets to come within the known dimensions of the magnetic field surrounding the device. Extended arm detectors function exactly the same as hand-held devices, except that their design allows them to be more easily deployed to bring their electromagnetic field closer to the ground for their specific use in detecting buried weapons or contraband."
| |
|
The U.S. Dollar and the Metal Industry, 2005.
A research proposal to determine the impact of a weak U.S. currency on European products within the metal industry and a synopsis of competition in China.
953 words (approx. 3.8 pages), 3 sources, MLA, $ 33.95
»
Click here to show/hide summary
Abstract
This paper outlines a research proposal whose intent it is to examine the impact of the U.S. dollar on European products, particularly with regard to the metal industry, and an analysis of the competitiveness of the U.S. with China.
Paper Outline:
Introduction
Background to the Problem
Significance of the Study
Objectives
Methodology
Conclusions/Recommendations
References
From the Paper
"The researcher intends to conduct a qualitative study of the literature currently available with regard to the economy and the US dollar vs. the European euro. The intent will be to develop a well thought out and grounded theory that explains the exact relationship between the US dollar and the European market for metals. Specifically the researcher will attempt to determine what if any action is necessary to help boost the US economy and stimulate a more productive metal industry. Studies suggest that the metal industry has been in decline for a number of years. This study will attempt to determine what action need be taken if any to reverse this trend."
| |
|
"Full Metal Jacket", 2002.
Uses the Game Theory to analyze the film, "Full Metal Jacket" by Stanley Kubrick.
1,650 words (approx. 6.6 pages), 4 sources, $ 62.95
»
Click here to show/hide summary
Abstract
This paper provides an analysis of Stanley Kubrick's film, "Full Metal Jacket," and discusses how this film can be understood with relation to the Game Theory. The paper analyzes three characters from the film and considers how their choices in the film illustrate the viability of game theory. Game theory is described here as a mathematical formula that asseses outcomes of situations based on people's choices and the author of this paper sees Kubrick's film as an example of how outcomes are effected by particular choices.
| |
|
Chelation Therapy and Metal Ions, 2001.
This paper is an overview of chelating groups used in the human body for treatment of excess and poisonous metallic ions.
1,715 words (approx. 6.9 pages), 3 sources, MLA, $ 55.95
»
Click here to show/hide summary
Abstract
This paper begins with a general overview of chemistry to familiarize the reader and describes how chelating ligands form complexes with metal ions. The chelating groups discussed are: Ionophores, British Anti-Lewisite, Cis-dichlorodiammine platinum (II) (Cisplatin(r)), and Ethylenediaminetetraacetic acid (EDTA). The paper states that Chelation therapy will most likely perfect the removal of tumors without the need for radiation.
From the Paper
"Within the periodic table is found the basic building blocks of life. From the organic atoms like carbon (C), hydrogen (H), and oxygen (O) to the in-organics such as sodium (Na), calcium (Ca), and even gold (Au), it has been proven that both are vital to the survival of live. In the mid to late 1800's, two men by the names of Mendeleev and Lothar Meyer began their work on the reoccurrence of certain characteristics of the known elements of the time (ref 1). It was not until some 15 years later that the periodic table, found in most every chemistry book published today, was accumulated into it's easy to read format by Thomsen and Bohr (ref 1). Since then, many more steps have been made in classifying elements, such as metals, non-metals, and metalloids."
| |
|
Erbium: The Metal and Its Uses, 2007.
A discussion of the history, physical properties and availability of the metal erbium.
918 words (approx. 3.7 pages), 9 sources, MLA, $ 32.95
»
Click here to show/hide summary
Abstract
This paper explores the metallic element erbium. The paper describes this rare element as typically gray in color but also containing pink compounds, making it useful as an addition to glass or porcelain products aesthetically. The paper discusses the history of erbium, provides an overview of its physical properties and outlines its uses and functions.
Outline:
Introduction
Who Discovered/When
Physical Properties and Locations
Companies Involved In Preparation and Sale
Methods of Preparation & Uses
Commercial Compounds
Conclusions
From the Paper
"Erbium is one of many elements listed in the periodic table, a metallic chemical element specifically (Columbia 15785). Symbolized by the abbreviation Er, most credit the discovery of this element to a scientist named Carl G. Mosander, who although did not isolate the element, located it and separated it from "three oxide fractions" (Columbia 15785). It was not until 1934 that pure erbium was isolated from it's fractions by other scientists (Columbia 15785) allowing for greater exploration into its uses for commercial purposes."
|
|
|
