Pros and cons of genetically modified food Research Paper

Pros and cons of genetically modified food - Research Paper Example But what is vital is to know that whether the emergence of the genetically modified food comes as a blessing or a curse to the human kind. It’s a boon on one hand as it enables the farmers to grow crops in areas where standard crops cannot be grown, thereby feeding people as well as helping in generating income for the population in the developing nations. This also reduces the reliance on harmful and dangerous pesticides. But it has to be admitted as well that till date much has not been known about these foods and hence it is justifiable when some express their concerns about the effect of the food on the health of the animal and human. Some are also concerned about the effect it has on the environment and the local economies and most importantly on the biodiversity. (Freedman, 2009, pp. 4-5) The ongoing debate on whether these foods will stay in the market or will become an extinct cannot be answered directly but the present scenario is marked with the escalation in the dem and of these foods throughout the world economy. The Genetically modified food (GMF) has been readily adopted and accepted in the United States which still persists to grow since its appearance in the market. This GM variety products have been predicted to spread in the â€Å"big- four† (Weasel, 2009, p.198) industrial crops which includes the corn, cotton, soy and canola in United States. (Weasel, 2009, p.198) It is very unlikely that genetically modified food presents any direct risk to the human health but the distinctive nature of these foods may cause harm to the human health in the future, due to the transfer of the genes between the species while they are produced. Hence they have to be carefully monitored, as the outcome of transgene effect is still not predicted. Apprehension has also been expressed as to whether there is a possibility of allergic reaction due to the consumption of the genetically modified food. There is also a fear of possibility that the living bac teria which are present in the human gut may gain resistance to the antibiotics due to the presence of the marker genes in the transgenic plants. (Nottingham, 2003, p. 91) Now the question arises how the consumers have accepted the genetically modified food. There are two opposing viewpoints regarding this, According to the industry leaders the consumer accept these foods because there has been a willingness from the public to consume it. As taking the case of America, where most of the milk is produced by using the bST hormone despite the fact that bST free milk are freely available, but even then the sale of the bST hormone free milk were initially very weak and hence it has disappeared from the market. Some national Survey in US has confirmed the fact that consumer’s concerns regarding GM foods are less. While some are of the opinion that the consumers are extremely worried about the GMF and are keen to pay extra to avoid GM foods. (Radas, Teisl and Roe, 2008, p. 335) Intr oduction Genetically modified (GM) foods also known as the genetically engineered foods are produced by inserting genes into the DNAs of other species. There are several reasons for producing genetically modified foods like in some cases to prevent the incidence of allergies after they are being consumed while there are instances where they are being developed for the betterment of their

Influences of economics and marketing on relationships in the global Essay

Influences of economics and marketing on relationships in the global food supply chain - Essay Example Exporting countries benefit from increased revenues from trading of surplus items, importing nations gain access to vital food reserves (Arda et al., 2005). Growing industrialization and profit making objectives have made a deep impact on the way food is being produced and supplied to the consumers today (Deep and Dani, 2009). The food supply chain is deeply impacted by rising prices, inflationary trends, and growing demands of increasing population have increased food prices. This has also led to multi-tiered supply chains that increase the complexity of the whole logistics process (Sowinski, 2012). The food supply chain begins with the farmer producing the supplies and the food items produced are sold by the farmers either directly to the food processor or indirectly through cooperative groups. The processed food is then sold to distributors to be distributed to various retailers and marketers and from there the food is finally sold to the consumers (FAO, 2004). The role of the far mers in the food supply chain is hence limited to the food processors and cooperative groups that are responsible for selling the farm produce to various distributing agencies, factories or processing units. This pattern limits the transparency of the whole system and farmers do not benefit much from the complex supply chains (Fearne et al., 2000). The globalization of economies has increased consumerism trends within the nations and this has led to a dramatic growth in consumption of food and related items. In context of the food supply chain this also reflects a shift in food movement from local and regional levels to global levels (Dicken, 2011). This has added to the complexity of the food supply...Global food security and governance have become increasingly complex in the past few decades owing to a gradual shift from local to global food supplies. â€Å"The capacity of single households to ensure an adequate supply of food for its members is affected by developments from loca l to global. Increasingly even nation states are losing control over the factors that determine the food security of their populations†. Conclusion In spite of the fact that an abundant quantity of food is being produced on the planet, millions are starving. The primary reason behind this is the corporate control over the food supply. The supply, distribution and manufacturing of food products have been controlled by the corporate system. The process of globalization has contributed to the advancement of biotechnology and agribusiness, which from the business’ perspective is profitable. Most of the capital invested on the production of food and food products goes to non-farmers. With the virtue of global economy, the corporations and supermarkets are churning a huge amount of money, which contributes to the imbalance of power between the farmers, consumers and food corporations.

The High Performance Concrete Construction Essay

The High Performance Concrete Construction Essay Concrete admixtures Construction materials Table of Contents Chapter 1: Introduction Introduction The High-performance concrete (HPC) is a mixture of many materials usually 5-10. The interaction between these materials is the reason of the various workability cases, and also the different ratios and portions added causes this variability. Testing the concrete is not the best solution for examining the workability properties, The testing process of the concrete need huge number of labor and materials, which is not cheap. There is, therefore, a need to predict the workability of concrete through a simpler, cheaper laboratory approach. Concrete workability is de ¬Ã‚ ned, according to American Concrete Institute (ACI), as the ease of placement of concrete and is usually quanti ¬Ã‚ ed by the result of the slump cone test. Rheological tests on cement paste were used to select the type and dosage of mineral admixtures that improved concrete workability. The conclusions reached based on cement paste tests were validated by concrete slump tests. It was also deemed interesting to compare the fundamental parameters (yield stress and viscosity) measured with a  ¬Ã¢â‚¬Å¡uid rheometer with the results from two commonly used empirical tests, the minislump and the Marsh cone tests. If a relationship could be established, the empirical tests could be used to design materials for a given yield stress and viscosity or, at the very least, rank different materials base on yield stress or viscosity. The decision to study the in ¬Ã¢â‚¬Å¡uence of mineral admixtures was dictated by the recent increase in use of mineral admixtures for improved concrete durability. Economics (lower cement requirement) and environmental considerations have also had a role in the growth of mineral admixture usage. The lower cement requir ement also leads to a reduction for carbon dioxide generated by the production of cement, while the use of a mineral admixture utilizes a product that would ordinarily be bound for the land  ¬Ã‚ ll. Thus, there is a double environmental bene ¬Ã‚ t from using mineral admixtures. Chapter 2: Literature review Background Concrete workability characterization Concrete workability cannot necessarily be sacri ¬Ã‚ ced for improved hardened properties, such as durability or strength. Workability is typically quanti ¬Ã‚ ed in the  ¬Ã‚ eld by the result of the slump cone tet. Nevertheless, a survey conducted by the National Ready-Mixed Concrete Association (NRMCA) and the National Institute of Standards and Technology (NIST) determined that, for I-IPC, the slump cone value is not representative of the ease of handling HPC in the  ¬Ã‚ eld. It was reported that concrete mixtures with the same slump might not behave the same way during placement. This implies that the slump value does not give enough data to fully characterize concrete  ¬Ã¢â‚¬Å¡ow. In the construction  ¬Ã‚ eld, terms like workability,  ¬Ã¢â‚¬Å¡owability, and cohesion are used, sometimes interchangeably, to describe the behavior of concrete under  ¬Ã¢â‚¬Å¡ow. The de ¬Ã‚ nitions of these terms are very subjective. Therefore, there is a need for a more  ¬Ã‚ rndamental and quantitative description of concrete  ¬Ã¢â‚¬Å¡ow. Rheological measurements of concentrated suspensions can be used to describe the  ¬Ã¢â‚¬Å¡ow of concrete. Numerous researchers have success ¬Ã‚ rlly used the Bingharn equation. Two parameters de ¬Ã‚ ne the  ¬Ã¢â‚¬Å¡ow: yield stress and plastic viscosity. Yield stress is related to slump, but plastic viscosity is usually ignored because only a few type of instruments exist to measure it. However, the viscosity may be related to properties such as stickiness, p1aceability,pumpability, and  ¬Ã‚ nishability. In addition, segregation could be de ¬Ã‚ ned as the ability of the aggregate to migrate (or sink) in the cement pa ste. This phenomenon is linked to the viscosity of the cement paste and the concrete mixture design. Therefore, methods to predict concrete workability need to take into account more than just the yield stress. What are Admixtures? Admixture is a material or a combination of different materials that are added to the concrete during mixing to enhance a property or more properties of the concrete mix, and providing it with new features that suits the need either if it is made by central batching plants, pre-stressed concrete factories or in-site mixing. Admixtures may enhance the workability, durability or strength of concrete. They can also be used to overcome extreme circumstances such as cold or hot weather w lower water-cement ratio. Admixtures are materials other than the main concrete mix components (water, cement, aggregate) which means that the admixture is added to the mixing water before or during the mixing process to give the concrete the needed properties, taking into consideration that there are some admixtures are added after a certain duration after mixing. Admixtures are divided into 2 types according to origin: chemical admixtures and mineral admixtures. Chemical admixtures They are materials that are found as fine particles or liquid and are added to the concrete to enhance it and give precise properties that are unobtainable in plain concrete mixtures. Usually, admixture quantities are not more than 5% of the mass of cement and are put into the concrete at the period of mixing. Public kinds of admixtures are. Accelerators that increase the speed of the hardening of the concrete. Normal materials utilized are calcium chloride, calcium nitrate and sodium nitrate. However, using chlorides could cause rust in the steel underpinning and it is banned in a some states, so nitrates are recommended. Retarders sluggish the hardening of the concrete and are utilized in colossal or tough dispenses whereas partial setting before the dispense is finished is undesirable. Normal polyol retarders are sugar, sucrose, sodium gluconate, glucose, citric acid, and tartaric acid. Air entrainments makes very small air bubbles inside the concrete during the batching process. It helps in protecting it from the harm made by frequent freezing and defrosting cycles. It also makes better workability, better consistency, less segregation and less bleeding. More than 80% of concrete pavements in the USA are made of air-entrained admixtures. Entrapped air, are huge air voids while entrained air, are very small voids range from 10 to 1000 micrometers. The admixture may be a liquid added during mixing or a powder mixed with the cement. Plasticizers raise the workability of the fresh concrete permitting it be easily placed, without joining efforts. Plasticizers can be utilized to decrease the content of water of concrete as keeping the workability, thats why they are called sometimes water-reducers. This action improves its strength and durability properties. Super plasticizers (Also known as High Range Water Reducers HRWR) They have the ability to reduce the amount of water needed for the concrete by 12-40% of the needed water. They produce concrete with the same workability but with lower water content ratio, they are also used to make highly flowable concrete. HRWR made out of polyether-polycarboxylates have higher efficiency and are used more widely. HRWR are added often in the site because of its low workability period, it increases the time of setting but increases the flowability for a longer period. Concrete that have HRWR in it has higher strength than that predicted by water content ratio, as the water content is not high so the permeability and shrinkage are lowered but the durability is increased. Corrosion inhibitors: rusting of steel reinforcement is a huge problem that encounters the durability of the reinforced concrete structures, from the causesof rusting of steel are the chlorides, they come from many sources like the deicing salts used to melt ice in winter or from sea water or they may come from the admixtures. From the ways of resisting the rust resulting from chloride is the use of corrosion inhibitors admixtures, they are added to the concrete during mixing to protect the steel by delaying the debut of rusting and also decrease the rate of rusting after it starts. They last for many years after the setting of concrete. Mineral admixtures There are inorganic materials having pozzolanic characteristics. These extremely fine-grained materials are added to the concrete mixture to enhance the properties of concrete or as a substitute for the cement, they decrease cost, permeability, enhance the strength and change other concrete characteristics, from the types of mineral admixtures are: Fly ash: A by-product of electrical coal-fired producing plants and can vary according to source; it is utilized to partly substitute the cement. The particles of fly ash are made of spherical glassy particles, its use has started in the USA in the 1930s, tests has proven that concrete can be replaced by one third with fly ash. Experiments made on high strength concrete has shown that its strength levels were up to 100 MPa at age of one year. Air-entrainment admixtures maybe required because of the carbon inside the fly ash. Ground granulated blast furnace slag (GGBFS or GGBS): is a product of made when the molten iron is put rapidly in water to decrease its temperature, it is crystalline shaped granular product of high adhesion, and so it be work as a substitute for part of the cement, the most favorable ratio is 50% of the cement if there is no salts and 25% if there is. Silica fume: A by-product aims to achieve both high strength and low permeability requirements made out of the creation of silicon and ferrosilicon alloys. Silica fume is compared to fly ash. The size of its particle is smaller by 100 times. This makes a higher ratio between surface and volume and a way faster reaction. Silica fume is utilized to raise the concrete strength and durability, but usually superplastisizers are needed for the workability. High reactivity Metakaolin (HRM): the concrete made using metakaolin has the same strength and durability of the concrete made using silica fume. As silica fume is normally dark gray or black in color, high-reactivity metakaolin is normally brilliant white in color, creating it the favored choice for architectural concrete whereas emergence is important. Types of Admixtures 1. Air entraining admixtures They are liquid chemicals that are added to the concrete during mixing to produce small air bubbles that are called entrained air. The air helps the concrete to resist the damage made by thawing, freezing and deicing salt. In hard concrete, the air enhances workability and decreases the bleeding and the segregation. Air entrainment is not important for the concrete used inside the structures as it is not exposed to either freezing or thawing, It ought to be evaded for concrete flatwork that have a flat troweled finish. In high cement content concretes, entrained will cut strength by 5% for every single 1% of air added; but in low cement content concretes, adding air has less result and could even cause a humble increased strength due to decreased water demand for needed slump. 2. Water reducers Are utilized for two purposes: (1) to decrease the water content in plastic concrete and rise its strength; (2) to attain higher slump without the need of adding water. Water-reducers will usually cut the needed water content of a concrete combination for a given slump. These admixtures disperse the cement particles in concrete and create extra ef ¬Ã‚ cient use of cement. This rises strength or permits the cement content to be decreased as maintaining the alike strength. Water-reducers are utilized to rise slump of concrete lacking adding water and are functional for impelling concrete and in hot meteorological conditions to offset the increased water demand. A little water-reducers could aggravate the rate of slump defeat alongside time. Mid-range water reducers are nowadays usually utilized and they have a larger skill to cut the water content. These admixtures are accepted as they enhance the finishability of concrete  ¬Ã¢â‚¬Å¡atwork. 3. Retarders Are chemicals that postpone the early hardening of concrete by an hour or more. Retarders are regularly used in hot climatic conditions to counter the quick hardening caused by elevated temperatures. For colossal jobs, or in hot climate, specify concrete alongside retarder to permit extra period for pumping and  ¬Ã‚ nishing. Most retarders additionally work as reducers. 4. Accelerators Reduce the early hardening period of concrete and give higher strength after small period. They do not work as an antifreeze; they decrease the time of the hardening and rate of strength increase, thus the concrete would be stronger to endure damage from cold in chilly weather. Accelerators are additionally utilized in fast trail assembly that needs early removal of forms. Accelerating admixtures consists of two types: chloride and non-chloride based. One of the extra competent and frugal is calcium chloride that is obtainable in fluid or  ¬Ã¢â‚¬Å¡ake form. For non-reinforced concrete, The CaCl can be utilized to an amount of 2% by the heaviness of the cement due to worries of corrosion of reinforcement instigated by Cl. Pre-stressed concrete and concrete that have aluminum or invigorated metal inside it ought not to have chloride-based materials because of the increased possibility for the rusting of the metal. Non-chloride established accelerators are utilized whereas there is fear of rusting of embedded metals or concrete reinforcement. 5. HIGH RANGE WATER-REDUCERS (HRWR) It is a distinct type of water-reducer. Also known as, super plasticizers, HRWRs decrease the water content of a concrete mix by 12% to 25%. HRWRs are consequently utilized to raise the strength and decrease permeability of concrete by decreasing the water content in the mix; or considerably raise the slump to make  ¬Ã¢â‚¬Å¡owing concrete lacking the addition of any extra water. These admixtures are vital for elevated strength and enhanced concrete mixes that have higher contents of adhesive materials and mixes having silica fume. Beside these kinds of admixtures, there are other materials obtainable for improving concrete characteristics for different types of applications. These products include rust resistors; admixtures that decrease shrinkage, anti-washout admixtures, and admixtures to decrease possibility for alkali aggregate reactivity, admixtures that helps pumping and a collection of colors and products that improves the concrete aesthetics. Fly Ash 1 Production Fly ash is a bi-product resulted from the finely divided residues generated from the combustion of coal electrically in thermal power plants; the dust collection system removes the fly ash, as a fine particulate residue, from the combustion gases before they are discharged into the atmosphere. The particles are finer than cement usually and consist off spherical glassy particles. 2 Properties Permeability The fly ash reacts with the calcium hydroxide chemically during the hydration process forming calcium aluminate and calcium silicate hydrate which decreases the risk of infiltration of calcium hydroxide and the permeability of concrete. The fly ash enhances the permeability of concrete also by decreasing the ratio of water to cement, which decreases the volume of pores. Its spherical shape also enhances the consolidation of concrete which reduces permeability. Use Fly ash has a spherical shape that allows it to create a ball bearing effect in the mix which improves the workability without increasing the water and also helps in increasing the pump-ability by decreasing the friction between the concrete and the pump line. It also increases the concrete pump-ability by increasing its cohesion and making it less subject to segregation. It also increases the gaining of strength of mixes for periods much longer than that of Portland cement only. The most important use of fly ash is that it increases the life cycle expectancy and durability. It also increases the resistance of corrosion of concrete reinforcement. Fly ash is used in concrete by replacing a portion of the Portland cement that may goes up to 30% of the total cement mix.

Reality TV shows Essay

Reality TV shows have become very popular on the small screen nowadays. There are many realities TV shows out there that can relate to anybody watching them. There are a lot of topics about how reality TV shows gives out different characteristics to the viewers. For example in the article â€Å"The Distorting Mirror of Reality TV† Sarah Coleman focuses on all the different characteristics that many reality TV shows provide for the people watching. In this paper I am going to talk about two characteristics that the reality show Hoarders provides to the viewers. The first characteristic is that it can promote stereotypes. The second is that it is informative. Finally I will decide whether or not Hoarders provides these characteristics or not. The first characteristic that I noticed on Reality TV is stereotypes. For example on â€Å"The Distorting Mirror of Reality TV† by Sarah Coleman, she states that reality TV perpetuates stereotypes. Her article also explains why stereotypes are constantly being used in many reality shows. â€Å"To make shows more dramatic† this is one of Coleman strongest reason why many reality TV perpetuates stereotypes. Another subject that Coleman mentions in the article is that Reality TV shows want to make real people interesting, so they give people characters to play. Reality TV shows are now more scripture than just showing people how â€Å"real† people actually act. In the Reality TV show Hoarders stereotypes is the first characteristic I noticed that was shown. This reality show, shows to the viewer how a hoarder lives and how their home looks like. The stereotype given towards the hoarder will always be someone that is depressed, sad, or hopeless. For example on Lisa’s episode, her hoarding problem started when she first lost her husband. Losing her marriage made Lisa depressed and hopeless. After her daughter left Lisa because of her hoarding problems, Lisa became worst. Lisa felt incomplete without anybody, but herself. She continued hoarding things because it made her feel like she had something and made her feel complete. The stereotype show that hoarders are always people that might has had a really bad lost in the family or has had a hard time in their lives. Showing this type of stereotypes to the viewers can show them that hoarding can be a problem that can happen to anybody in the world. Hoarders clearly want to show to the viewers some of the problems real people face in the real world  and what type to people are the ones facing this problems.

The Nuiances of Online Paper Writer

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Using Verbs and Adjectives to Brighten up News Stories

Journalism students just getting started in the craft of news writing tend to clog up their prose with too many adjectives and lots of boring, cliched verbs, when in fact, they should be doing the opposite. A key to good writing is to use adjectives sparingly while choosing interesting, unusual verbs that readers dont expect. The following breakdown illustrates the effective use of adjectives. Adjectives Theres an old rule in the writing business - show, dont tell. The problem with adjectives is that they dont show us anything. In other words, they rarely if ever evoke visual images in readers minds, and are just a lazy substitute for writing good, effective description. Look at the following two examples: The man was fat. The mans belly hung over his belt buckle and there was sweat on his forehead as he climbed the stairs. See the difference? The first sentence is vague and lifeless. It doesnt really create a picture in your mind. The second sentence, on the other hand, evokes images through just a few descriptive phrases - the belly hanging over the belt, the sweaty forehead. Notice that the word fat isnt used. It isnt needed. We get the picture. Here are two more examples. The sad woman cried at the funeral.The womans shoulders shook and she dabbed at her moist eyes with a handkerchief as she stood over the casket. Again, the difference is clear. The first sentence uses a tired adjective - sad - and does little to describe what is happening. The second sentence paints a picture of a scene that we can readily imagine, using specific details - the shaking shoulders, the dabbing of the wet eyes. Hard-news stories often dont have the space for long passages of description, but even just a few keywords can convey to readers a sense of a place or a person. But feature stories are perfect for descriptive passages like these. The other problem with adjectives is that they can unwittingly transmit a reporters bias or feelings. Look at the following sentence: The plucky demonstrators protested the heavy-handed government policies. See how just two adjectives - plucky and heavy-handed - have effectively conveyed how the reporter feels about the story. Thats fine for an opinion column, but not for an objective news story. Its easy to betray your feelings about a story if you make the mistake of using adjectives this way. Verbs Editors like the use of verbs because they convey action and give a story a sense of movement and momentum. But too often writers use tired, overused verbs like these: He hit the ball. She ate the candy.They walked up the hill. Hit, ate and walked - booooring! How about this: He swatted the ball. She gobbled the candy.They trudged up the hill. See the difference? The use of unusual, off-the-beaten-path verbs will surprise readers and add freshness to your sentences. And anytime you give a reader something they dont expect, theyre bound to read your story more closely and more likely to finish it. So get out your thesaurus and hunt down some bright, fresh verbs that will make your next story sparkle. The larger point is this,  as journalists, you are writing to be read. You can cover the most important topic known to man, but if you write about it in dull, lifeless prose, readers will pass your story by. And no self-respecting journalist wants that to happen - ever.

Transcendentalism Expressed Through Huck Finn - 1706 Words

Miles Walton Mrs. Long English/period 3 January 9, 2015 Transcendentalism Expressed through Huck Finn Many times an authors purpose of writing a fictitious story is to not only create a story for the reader to enjoy, but to allow the reader to get something out of the story that they may not have thought about on their own. Often times the inside meaning in a story may involve something about society that the author either likes or dislikes and wants you to think about the problem yourself. In the story, â€Å"The Adventures of Huckleberry Finn† the author, Mark Twain does an excellent job in creating an enjoyable story as well as propose a problem in society. Twain believed that society was corrupt and cruel so he created a fictional story to portray the issue. In order to do this twain created a character and put him in a corrupt society where he went on numerous adventures and throughout the story questioned the ways of society and became transcendental to their ideas. The first idea of transcendentalism is being a non-conformist and twain gives many examples of non- conformist thoughts and actions in order for him to portray his thoughts of how society is corrupt. When Huck finds Jim Huck says â€Å"people would call me a lowdown Abolitionist and despise me for keeping mum- but that don’t make no difference. I aint going to tell† (41). He is concerned with the legality and morality of being frinds with a slave. Deep in his heart Huck is drawn to helping Jim because he knows