Judicial Decisions Essay Example | Topics and Well Written Essays - 3000 words

Judicial Decisions - Essay Example In addition to this there seems to be differing schemes protecting both the landlord and the tenants found in the distinction of the equitable and legal leases. The distinction becomes extremely important as if an interest in land is found to be a lease then one is protected by the Rent Acts, while the licence seems to encompass only limited rights as according to the terms of the arrangement between the parties with minimal state intervention. It is one of the fundamental themes in accepting what a lease is that the period identified in the arrangement between the landlord and the occupier is for a fixed term. In Lace V. Chantler [1944], it was held that a lease for the duration of a war was not a certain period as one could not surely envisage when the war would be over, thus this would be a licence revocable when the war would be over. However, even a short term, for instance a month to month agreement would seem to be satisfying the requirements of the LPA 1925 as each party holds power by notice to determine the continuity of the lease at the end of each month and this saves the arrangement from being uncertain. (Prudential Assurance Co. Ltd v London Residuary Board [1992]) Even time sharing agreements have been held to be tenancies recently (Cottage Holiday Associates Ltd v. Customs and Excise Commissioners [1983], Smallwood V. Sheppards [1895]). Perhaps even here, the underlying fact remains the intention of the par ty which could be evidenced by virtue of the mode of payment and the time period even though this is not an essential element (Ashburn Anstall v. Arnold [1989]). The concept of exclusive possession is also a very important one in the determination of a lease. Essentially, where the occupier could exclude anyone at all and is free to use the land as he wants subject to certain restrictions, this arrangement could easily be termed as a lease. Where a landlord had rights reserved to enter the premises, empty meters and change linen, it was held to be a licence (Appah v. Parncliffe Investments [1964]. A similar analogy could be drawn with the occupation of rooms in hotels and motels. It is normally quite clear to the occupier that he does not have the rights of a tenant with regards to the room he is occupying and his rights only stem from and are limited to the service contract concluded between him and the hotel, etc. Hence, the traditional distinction between a lease and a licenc

Price Test Triggers Outrage on Internet :: Essays Papers

Price Test Triggers Outrage on Internet Will dynamic pricing become the next trend in e-commerce? Maybe, to unsuspecting consumers, it already is. The Internet provides consumers with many shopping advantages including the ease and availability of shopping from home, and the benefit of easily comparing merchandise and prices at various online retail locations. Dynamic pricing is a process where retailers (in this case, online) adjust their pricing according to information directly related to the purchasing consumer, or the conditions around them. An example of dynamic pricing in the physical world might be the local coffee shop charging more for hot coffee in the wintertime. This seems rather harmless, does it not? In e-commerce this kind of price fixing is worrisome because of the type of information a web site developer can retrieve from, or add to a visitor's computer using a variety of programming tools. There are few laws or regulations governing the use of the Internet, or protecting consumers' privacy. This c reates a wide open door for online marketing schemes that take advantage of, or deceive the consumer. David Sheffield, or the Washington Post, writes that Amazon.com, one of the leading online retailers, has been implementing a questionable pricing test. Using advanced technology, Amazon was able to place an electronic tag into the computer systems of all their web site visitors. When a consumer visited their web site, it would look for that tag on the visitors system to see if the visitor is a new or existing customer. By knowing this, the site would know what prices to display. Though one would think the repeat customer would benefit from this by getting price breaks, it was actually just the opposite. Amazon.com was charging higher prices for returning customers! Bill Curry, spokesman for Amazon.com, is quoted as saying the price test "was done to determine consumers' responses to different discount levels." However, in an email exchange with a DVDTalk member, an Amazon customer service representative stated "I would first like to send along my most sincere apology for any confusion or frustration caused by our dynamic price test". Whether it was dynamic pricing, or not, the deeper issue of consumers' online privacy still remains. Amazon.com was able to perform this "price test" because of a lack of laws regulating e-commerce, and consumer privacy. There are only a few laws now pertaining directly to Internet related issues, and most of these are state laws, not national. Price Test Triggers Outrage on Internet :: Essays Papers Price Test Triggers Outrage on Internet Will dynamic pricing become the next trend in e-commerce? Maybe, to unsuspecting consumers, it already is. The Internet provides consumers with many shopping advantages including the ease and availability of shopping from home, and the benefit of easily comparing merchandise and prices at various online retail locations. Dynamic pricing is a process where retailers (in this case, online) adjust their pricing according to information directly related to the purchasing consumer, or the conditions around them. An example of dynamic pricing in the physical world might be the local coffee shop charging more for hot coffee in the wintertime. This seems rather harmless, does it not? In e-commerce this kind of price fixing is worrisome because of the type of information a web site developer can retrieve from, or add to a visitor's computer using a variety of programming tools. There are few laws or regulations governing the use of the Internet, or protecting consumers' privacy. This c reates a wide open door for online marketing schemes that take advantage of, or deceive the consumer. David Sheffield, or the Washington Post, writes that Amazon.com, one of the leading online retailers, has been implementing a questionable pricing test. Using advanced technology, Amazon was able to place an electronic tag into the computer systems of all their web site visitors. When a consumer visited their web site, it would look for that tag on the visitors system to see if the visitor is a new or existing customer. By knowing this, the site would know what prices to display. Though one would think the repeat customer would benefit from this by getting price breaks, it was actually just the opposite. Amazon.com was charging higher prices for returning customers! Bill Curry, spokesman for Amazon.com, is quoted as saying the price test "was done to determine consumers' responses to different discount levels." However, in an email exchange with a DVDTalk member, an Amazon customer service representative stated "I would first like to send along my most sincere apology for any confusion or frustration caused by our dynamic price test". Whether it was dynamic pricing, or not, the deeper issue of consumers' online privacy still remains. Amazon.com was able to perform this "price test" because of a lack of laws regulating e-commerce, and consumer privacy. There are only a few laws now pertaining directly to Internet related issues, and most of these are state laws, not national.

Junot Diaz Biography

Junot Diaz was born in the Dominican Republic and raised New Jersey. He is a creative writing teacher at MIT and fiction editor at the Boston Review. He also serves on the board of advisers for the Freedom University, a Volunteer organization in Georgia that provides post-secondary instruction to undocumented immigrants. From what I have read I have gathered that he really had to rely on himself. Getting him through college working the jobs where you have to do the dirty work, dishes, and pumping-gas. Supposedly Drown reflects Diaz’s strained relationship with his own father, with whom he no longer keeps in contact with. Diaz was born in Villa Juana, a neighborhood in Santo Domingo, Dominican Republic. He was the third child in a family of five.Through most of his childhood he lived with his mother and grandparents while his father worked in the United States. Diaz emigrated to Parlin, New Jersey, in December of 1974, where he was able to reunite with his father. He lived clos e to what he considered one of the largest landfills in New Jersey. His short fiction has appeared in The New Yorker magazine, which listed him as one of the 20 top writers for the 21st century.He has also been published in Story, The Paris Review, and in the anthologies The Best American Short Stories four times (1996, 1997, 1999, 2000), The PEN/O. Henry Prize Stories (2009), and African Voices. He is best known for his two major works: the short story collection Drown (1996) and the novel The Brief Wondrous Life of Oscar Wao (2007). Both were published to critical acclaim and he won the 2008 Pulitzer Prize for Fiction for the latter. Diaz himself has described his writing style as â€Å"[†¦] a disobedient child of New Jersey and the Dominican Republic if that can be possibly imagined with way too much education.†Dà ­az has received a Eugene McDermott Award, a fellowship from the John Simon Guggenheim Memorial Foundation, a Lila Acheson Wallace Readers Digest Award, th e 2002 PEN/Malamud Award, the 2003 US-Japan Creative Artist Fellowship from the National Endowment for the Arts, a fellowship at the Radcliffe Institute for Advanced Study at Harvard University and the Rome Prize from the American Academy of Arts and Letters. He was selected as one of the 39 most important Latin American writers under the age of 39 by the Bogotà ¡ World Book Capital and the Hay Festival.[18] In September 2007, Miramax acquired the rights for a film adaptation of The Brief Wondrous Life of Oscar Wao.The stories  in Drown focus on the teenage narrator's impoverished, fatherless youth in the Dominican Republic and his struggle adapting to his new life in New Jersey. Reviews were generally strong but not without complaints. Dà ­az read twice for PRI's This American Life: â€Å"Edison, New Jersey† in 1997 and â€Å"How to Date a Browngirl, Blackgirl, Whitegirl, or Halfie† in 1998. Dà ­az also published a Spanish translation of' Drown, entitled Negocios . The arrival of his novel (The Brief Wondrous Life of Oscar Wao) in 2007 prompted a noticeable re-appraisal of Dà ­az's earlier work.Drown became widely recognized as an important landmark in contemporary literature—ten years after its initial publication—even by critics who had either entirely ignored the book or had given it poor reviews. The Brief Wondrous Life of Oscar Wao was published in September 2007. New York Times critic Michiko Kakutani characterized Dà ­az's writing in the novel as: a sort of streetwise brand of Spanglish that even the most monolingual reader can easily inhale: lots of flash words and razzle-dazzle talk, lots of body language on the sentences, lots of David Foster Wallace-esque footnotes and asides.And he conjures with seemingly effortless aplomb the two worlds his characters inhabit: the Dominican Republic, the ghost-haunted motherland that shapes their nightmares and their dreams; and America (a.k.a. New Jersey), the land of freedom an d hope and not-so-shiny possibilities that they’ve fled to as part of the great Dominican diaspora. Dà ­az said about the protagonist of the novel, â€Å"Oscar was a composite of all the nerds that I grew up with who didn’t have that special reservoir of masculine privilege. Oscar was who I would have been if it had not been for my father or my brother or my own willingness to fight or my own inability to fit into any category easily.† He also has said that he sees a meaningful and fitting connection between the science fiction and/or epic literary genres and the multi-faceted immigrant experience.

Learning Technologies in Adult Education Essay - 1947 Words

Learning Technologies in Adult Education Any tool â€Å"designed to extend a learner’s capacity for effective action and that requires skill and certain strategies to use efficiently† is a learning technology (Burge 2001, p. 146). A well-structured face-to-face group discussion, a pencil, and print materials fit this definition as do newer tools such as web-based conferencing (ibid.). One of the greatest myths surrounding learning technologies is related to what they are. Because of the term technology, it is frequently believed that learning technologies are instructional devices that make use of computers, the Internet, or some other type of electronic technology such as video and television. Newer learning technologies are changing†¦show more content†¦2001). Although frequently thought of as merely a delivery system, the role of technology should be to create an environment that facilitates learning (Olgren 2000). No amount of hardware and software can substitute for a poorly designed learning experience (Wagner 2001). In considering and choosing learning technologies, the emphasis should always be on learning, with technology playing a supporting role. Furthermore, no single technology is the answer to all teaching and learning needs. â€Å"Current pressures to put all the course materials on the web, for example, is too simplistic an answer to very complex questions about learning style differences, the kinds and levels of learning objectives and outcomes, the learning resources best suited to those objectives, the communications infrastructure in place or needed, and limits to the money and staff skills available† (Burge 1999, p. 2). Learning Technologies Are Neutral? Another myth surrounding learning technologies is that they are neutral, that is, they are separate from the social structures in which they are designed and they have no influence on the teaching and learning environment (Miller 2001). Although questions about which technologies to choose to accomplish â€Å"pedagogical and intellectual purposes† are important, â€Å"the larger question of the imperatives of the technology itself and how these shape what we do, how we think about ourselves, and what we do†Show MoreRelated The Case for Technology Essay1710 Words   |  7 Pages Technology permeates our society. In work settings, employees are expected to use computers for such tasks as communication, information management, problem-solving, and information seeking. Because technology is such an integral part of modern life, it behooves educators to prepare learners to use it effectively. Technology also has a role in the instructional process for it can serve as a means of supporting and enhancing instruction. Based on an analysis of the literature, Hopey (1998) notedRead MoreAdult Learning Theory: Andragogy Essay1408 Words   |  6 PagesAdult Learning Theory: Andragogy The dispute of how adults learn is an ever developing subject matter since the 1920’s when adult learning became a professional field of practice (Merriam, S., 2001). Questions such as, do adults learn differently from children? Are adults able to learn quicker, independently, or in the same environment? These are just some examples of a multitude of questions that have been raised since scientists began investigating Adult Learning. I intend to clarify someRead MoreWhy Did the Railroad Network Grow so Rapidly After the Civil War? What Consequences Did This Have for the Countrys Economic Development?1077 Words   |  5 PagesAdults are motivated entirely different in the way they learn. Adults are motivated to learn for various reasons such as professional development, potential advancement at work or simply continuing to improve ones lives, as one gets older. However, it is but practical to consider the ideas on how adults are motivated to learn, what principles of lear ning works, so that adult educators could likewise respond appropriately. The participatory worldview that author Lyle Yorks (2005) describesRead MoreExploring The Foundation Knowledge Of Program Planning823 Words   |  4 Pagesexamined in five ways, adult learning, cultural differences, relationship building, power and interests, and technology. Knowing how adults learn and how to operate a constructed program that will connect with all adults. Adult programs consist of continuing education, psychology, sociology, anthropology, neurosciences, and cultural studies (Caffarella Daffron, 2013). Adult education is a field that mature students returns to college and choose as a major. Adult learning discusses different programsRead MoreDistance Learning: Emerging Technologies vs. Traditional Class Instruction953 Words   |  4 PagesDistance Learning: Emerging Technologies vs. Traditional Class Instruction High pace of life and time span has changed many aspects of learning. Distance education is new model of teaching and learning having the power to improve educational outcomes dramatically. As a result, many people are asking how to scale-up scattered, successful islands of innovation into universal improvements in schooling (Dede 1998). Undertaking systemic reform (sustained, large-scale, simultaneous innovation in curriculumRead MoreEducation Is The Most Modern Means Of Learning778 Words   |  4 Pagescritical to solving a problem or correcting a situation within adult education. Online courses are now starting to prevail over traditional college education and my vision for future education derives on the idea that companies and businesses will start directing education institutions with material that are in-line with such businesses. Vision of future education Online education is the most modern means of learning. As technology advances, educators, students and companies will be able to tailorRead MoreOnline Learning and the Adult Learner Essay1715 Words   |  7 Pageschildren and young adults are capable of today. The gadgets and gizmos available now would only be dreams then. Technology, and the ever growing availability of mobile technology, has moved us light years ahead from the days of learning solely by experience, hardbound books and in brick-and-mortar learning establishments. However, there seems to be a growing gap between the knowledge necessary to succeed in life, and the things learned and available yesteryear. Today more than ever, adult learners requireRead MoreAdult Learners : The Adult Learner : Neglected No More1618 Words   |  7 Pages Adult Learners 1 Characteristics of Adult Leaners Roles and Characteristics Analysis W. Shawn Bain EAD 510 Professor Singleton, C. October 27, 2015 Adult Learners 2 Introduction Malcolm Knowles pioneered the study of adult education. In Lee’s book, The adult learner: Neglected no more. Training. (Lee, 1998). The term Malcolm used to describe this form of study of adults is called androgyny. Some of the assumptions that Knowles studied were self-concept, experience, readinessRead MoreMy Philosophy Of Adult Education1318 Words   |  6 PagesHow My Philosophy of Adult Education Changed Before taking adult education classes, I was under the impression that learning for adults and children were the same. The difference being that correct context was being taught to children and different content for adults. My impression of adult education has changed immensely. First and foremost, the first lesson learned that teaching adults are a separate, intensive, and long debated process. Portions of certain theories learned illustrated belowRead MoreOnline Learning and the Adult Learner Essay968 Words   |  4 Pagesï » ¿ Online Learning and the Adult Learner Christian E. Onuoha College 100 American Public University Jennifer Staley Online Learning and the Adult Learner Knowledge is power, therefore it is always a good thing for adults to be involved in continued education. The level does not really matter, be it in pursuant of certificate, bachelor or doctorate degree, but the ability to be involved in the process and going through the rigors of such endeavor

The War On Drugs American Foreign And Domestic Policy

The United States has focused its efforts on the criminalization of drug use. In June 1971, President Nixon declared a â€Å"war on drugs.† He dramatically increased the size and presence of federal drug control agencies, and pushed through measures such as mandatory sentencing and no-knock warrants. . The War on Drugs has been a centerpiece of American foreign and domestic policy. The rhetoric of war shaped the impact of methods. Not only does war require military strategies, but an enemy as well. In this case it was easy to construct African Americans and people of color as the enemy in the War on Drugs. These are the groups that the majority of white Americans have always viewed as the source of crime. President Reagan’s anti drug rhetoric was skillfully designed to tap into deeply held cultural attitudes about people of color and their links to drug use and many other illicit behaviors. While the professed enemies of the War on Drugs were drug cartels in drug source countries, the most affected were people of color in inner city neighborhoods, mainly African Americans. Thus, the social and economic mobility of Black Americans has suffered collateral damage from the War on Drugs and damages the upward mobility of the African American communities. By almost any measure, the drug war s impact on African American communities has been devastating. Millions of African Americans have been imprisoned, many have been unfairly treated by the criminal justice system, the rights ofShow MoreRelatedThe Impact Of Latin American Culture On Latin America1656 Words   |  7 Pagesan active war zone, living in Latin America would be much like that. The war being fought here is very different, instead of fighting another country, they are fighting drugs. Although war is generally a negative thing, this one is not. In this war there are negatives, but the positives far outweigh them. Latin American countries have witnessed the very noticeable benefits of the drug trade in many aspects of everyday life. The use and production of drugs is important to Latin American culture, bringsRead MoreTheodore Roosevelt : An American Author, Soldier, Explorer And Reformer1136 Words   |  5 PagesBottari 1 Nick Bottari Professor Galgano American Lives November 23rd 2015 Theodore Roosevelt Essay Prompt #11 Theodore Roosevelt often known as Teddy or TR was an American author, soldier, explorer and reformer. He was the 26th President of the United States. He was the president from 1901 to 1909. TR was born on October 27th, 1858 in Manhattan, New York. He was one of four children. Roosevelt struggled as a young kid being that he had poor health and debilitating asthma. He repeatedlyRead MoreThe President Of The United States1532 Words   |  7 Pagespresident of the United States of America, on April 7th 2015 under the Republican Party. He ran under the slogan Defeat the Washington machine. Unleash the American dream, and promised to be a non-establishment Republican president. Rand Pal is by far the best candidate for the presidency in all fields, but most specifically, for our economy, our foreign affairs, and our rights and liberties. The economy is a major part of any presidential campaign, as it should be, since our economy is very weak rightRead MoreWho Can Save America?1539 Words   |  7 Pagespresident of the United States of America, on April 7th 2015 under the Republican Party. He ran under the slogan Defeat the Washington machine. Unleash the American dream, and promised to be a non-establishment Republican president. Rand Pal is by far the best candidate for the presidency in all fields, but more specifically, for our economy, our foreign affairs, and our rights and liberties. The economy is a major part of any presidential campaign, as it should be, since our economy is very weak rightRead MoreDrug Cartels And The United States1688 Words   |  7 Pagessituation in Mexico regarding the Drug Cartels has been an ongoing battle that has taken the life of between 30,000 to 40,000 civilians, cartels henchmen and federal employees. The violence has evolved into something new in recent years. The brutality contributed by the drug cartels could potentially be labeled as terrorist acts. The strong domestic conflict surrounding the drug cartel in Mexico has boiled over the border and into the United States. Illegal drugs enter the United States through variousRead MorePolitics During The 1980 S1383 Words   |  6 Pagesin the U.S. during the 1980’s were exciting. Much like everything else during this decade, politics were changing and making a new way for economic development and social construct. Policy in the 1980’s were both huge on foreign pol icy, and domestic development. The cold war, being the main concern with foreign policy, consisted of Communism versus Democracy, or Socialism versus Capitalism. President Reagan being the face of America and our Commander and Chief, created â€Å"Reaganomics,† which foughtRead MoreThe Invasion of Panama Essay930 Words   |  4 PagesAmerican presidents often establish foreign policies that effect the country’s citizens oversees and in America. The Invasion of Panama was part of the restoration of America’s military prestige, after years of misgivings. The Panama Invasion was the extension of the domestic plans for a Drug-Free America (US II. 33). Lastly, the Invasion of Panama is an example of presidential foreign policies that involve America in foreign affairs. The Panama Invasion was a conflict that was the beginning toRead MoreThe United Statesstrategy For Combating Drug Trafficking Across Their Shared Border1521 Words   |  7 PagesSince 2008, the United States and Mexico have worked collaboratively to combat drug trafficking across their shared border. The State Department’s current position on the situation is to to support continued cooperation with Mexico and collaborate on strategies to increase security and create policy measures that strengthen the rule of law. The State Department divides the United States’ strategy for combatting drug trafficking into four strategies: targeting cartels and their operations, aidingRead MoreFrom World War II to the present, policies both foreign and domestic have reshaped and changed700 Words   |  3 Pages From World War II to the present, policies both foreign and domestic have reshaped and changed American culture and Identity. Several of the events that greatly shape and impacted policies in the United States are Civil Rights Movement, the Vietnam War and the September eleventh terrorist attack in 2001. The Civil Rights Movement has changed what life is like in America and has improved in a better way. Previous to the movement, many races were treated as inferior. Race riots broke out everywhereRead MoreThe Legacy of Ronald Reagan1004 Words   |  5 PagesIran-Contra Affair, which will forever be tied to his name in a negative regard. Within America, Reagan was able to improve society such as his success in curbing the use of illegal drugs. Ronald Reagan is often times cited as the best president the United States has ever had, due to his relentless attacks on communism and illegal drug use in America, even with his involvement in the Iran-Contra Affair. Ronald Reagan was tremendously successful in his pursuit to end communism around the world, and to

How Does Embryonic Stem Cells Help Treat Patients With...

Introduction: According to the World Health Organisation, around the world, between 250,000 and 500,000 people suffer from spinal cord injuries. People living with these spinal cord injuries are said to be 40% more likely to die prematurely than those who do not suffer from these particular injuries. One possible treatment that can be applied is the use of embryonic stem cells to help treat patients with spinal cord injuries. Embryonic Stem Cells (ESCs), as their name suggest, are derived from the inner cell mass from an early stage, pre-implantation embryo, known as a blastocyst, from eggs which have been fertilized via in vitro fertilisation (IVF). Once consent has been given by the host, these pluripotent stem cells are then cultured and donated for research purposes. The Human Embryonic Stem Cells, (hESCs) serve a multitude of purposes, ranging from growing synthetic organisms, treating degenerative disease and also repairing damaged tissue. The omnipotence of hESCs allows them to have t he potential to successfully treat spinal cord injuries by stimulation spinal cord neuronal regeneration. This method could be applied to save many patients lives as well as provide social and economic benefits. Consequently, however, the use of hESCs provides a highly controversial debate. Whilst this method may alleviate financial burdens of living with spinal cord injuries, the use of hESCs also arises many ethical issues concerning their use. Also, alternative solutions suchShow MoreRelatedStem Cell Research is a Vital Necessity for Medical Advances in America1373 Words   |  6 Pagesmeans allowing embryonic stem cell research, which has the potential to help 150 million Americans who suffer from serious or incurable diseases or disabilities† (Roleff 63). It is incredible how some of the smallest items like stem cells can have such a drastic impact on the world. Two types of these tiny cells are adult stem cells and embryonic stem cells. These stem cells are importan t and have unique opportunities. However, there are ethical issues with researching stem cells. NeverthelessRead MoreEmbryonic Stem Cell Research Could Help Out Many People1886 Words   |  8 Pages Embryonic stem cell research could help out many people and benefit from the research that they do on embryonic stem cells. There is a very big ethic problem when it comes to doing the research on the stem cells, but do you think that it is worth it? There are some pros and cons on the research on embryonic stem cells. There is many benefits to conducting research on the stem cells. They could use differentiated cells that could result to certain disease that require transplanting stem cellsRead MoreThe Debate Of Embryonic Stem Cell Research1292 Words   |  6 PagesEmbryonic stem cells research is the most debated type of stem cell research. The moral standings of embryonic stem cell research have been debated since the research started. The side against the research claims that it is wrong to value one’s life above another and that the elimination of the most basic form of life is murder. While the side supporting the research claims that the research could bring about the cure for many types of diseases and help save the lives of millions. Embryonic stemRead MoreStem Research On Stem Cell Research1747 Words   |  7 PagesNovember 2014 Stem Cell Research Stem cell research has cultivated a new, miraculous study in the health field. The study has led to an increase in curing diseases over the past couple of decades. Before stem cell research, diseases were destroying and devastating lives continuously on end. With the use of stem cells in modern time, diseases are no longer taking control of lives. The innovation in biomedical technology, such as stem cell research, has greatly impacted the understanding of how diseasesRead MoreIs Stem Cell Research Ethical?1252 Words   |  6 Pages Is Stem Cell Research Ethical? The question that has been asked so many times, is stem cell research ethical? To argue ethics over this topic, one must first know what a stem cell is.Stem Cells are â€Å"cells with the ability to divide for indefinite periods in culture and to give rise to specialized cells† (Stem Cell Basics: Introduction). The National Institutes of Health say that stem cells are distinguished for two different reasons. The first is â€Å"they are unspecialized cells capable of renewingRead MoreStem Research On Stem Cell Research1318 Words   |  6 Pagesknown as Stem Cell Research (SCR). Stem Cell Research is a relatively new field that has shown much promise to help deal with hundreds of different conditions and diseases. Though this astounding field holds the key to saving thousands of lives, there is a misguided ethical problem with Stem Cell Research raised by the church. The church only focuses on one aspect of harvesting stem cells when there is more than one way to get stem cells. This isn’t the only thing that is holding SCR back. Stem CellRead MoreThe Debate Over Stem Cells And Cloning1398 Words   |  6 PagesAbstract Stem cells and cloning are very controversial today. There are debates and arguments about it all over the internet. The idea of stem cells is to use them to help cure and prevent diseases. You can use embryonic and adult stem cells. That’s one of the reasons people argue about it, because it kills the potential life of the embryo. [Stem Cells and Cloning] Stem cells and cloning is very controversial in today s society. Some people believe it’s not a good idea because it destroysRead MoreEssay on Human Embryonic Stem Cells 2138 Words   |  9 Pagesof a federal judge because of several issues that emerged with stem cell research being funded by the government. Although, the science of human embryonic stem cell is in its initial stages - there is much hope for scientific advancement due to the ability for human embryonic stem cells to grow into virtually various kinds of cells   Favorably, advocates for stem cell research and pharmaceutical companies strongly believe that stem cells may pave a way to discover new methods of treatment for devastatingRead More Embryonic Stem Cell Research: How does it affect you? Essay1557 Words   |  7 Pages Embryonic Stem Cell Research: How does it affect you? nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp; Embryonic stem cell research is widely controversial in the scientific world. Issues on the ethics of Embryonic Stem (ES) cell research have created pandemonium in our society. The different views on this subject are well researched and supportive. The facts presented have the capability to support or possibly change the public’s perspective. This case study is based on facts and concernsRead MoreStem Cell Research : Stem Cells1999 Words   |  8 Pagespossibility. Despite some opinions, this process does not happen naturally, or take place as cinematically as one might imagine. Over the past decade, there have been major advances in regenerative medicine, commonly known as stem cell research. Stem cells are undifferentiated cells within the body that have the capability to specialize into any tissue. They are most commonly found in cord blood, bone marrow, organ donations, placenta, and embryos . Stem cells are seen by some as a new miracle treatment

Multistep Synthesis of Benzilic Acid Free Essays

Multi-Step Synthesis of Benzilic Acid from Benzoin Abstract: The main purpose of this experiment was to convert a secondary alcohol to a ketone, utilizing a mild and selective oxidizing agent. In addition, this converted alpha diketone was then subjected to rearrangement to a carboxylate salt, then acidification, to produce an alpha-hydroxyacid. In this experiment, benzoin was used and converted into benzil, which was then used to synthesize benzillic acid. We will write a custom essay sample on Multistep Synthesis of Benzilic Acid or any similar topic only for you Order Now The yields were not ideal: . 081g of benzil- a 27. 5% yield; . 038g of benzilic acid- a 34. 7% yield. The matching melting points and IR readings, however, confirmed a high degree of purity for each compound: 95. 6 °C for benzil, and 104. 5 °C for benzilic acid, meager . 632% and . 333% discrepancy from literature values, respectively. Finally, the IR absorption frequencies on the attached graphs illustrate the successful removal of the alcohol in the oxidation step and successive return of the alcohol/creation of carboxylic acid, following rearrangement. Multistep syntheses are essential to producing complex molecules. This experiment illustrated the importance of verifying intermediary products are pure, by utilizing different techniques such as IR and melting point. Below is a diagram of the overall reaction. First Reaction: Second Reaction: Introduction: The multistep reaction from Benzoin to Benzillic acid involves multiple organic chemistry concepts, such as oxidation and rearrangement. The first part of the experiment involves the oxidation of benzoin to benzil, utilizing a mild oxidating agent. The process of oxidation is used in all organic chemistry labs and is essential to a wide variety of synthesis reactions. In addition, oxidation reactions are essential in the the biochemistry of most living organisms. This experiment also breaks down oxidizing agents into selective and non-selective agents. For this experiment’s purposes, nitric acid was used, as it is selective towards secondary alcohols, oxidizing them to ketones. The second part of this experiment involves the rearrangement of benzil to benzillic acid or, more generally, the reaction of an alpha-diketone to an alpha-hydroxyacid. This reaction was first conducted by Justus von Liebig in 1838 (1). The basics of this reaction involve the formation of a carboxylate salt from an alpha-diketone; acid is then added to produce an aromatic alpha-hydroxyacid. The reaction conducted in this experiment is an essential base step in the synthesis of pharmaceuticals and certain hallucinogenic drugs. The synthesis of Benzil from Benzoin is shown below: The above reaction shows the condensed oxidation of benzoin to benzil. The following diagram shows the condensed reaction of benzil to benzillic acid. Rearrangement occurs to form a salt, then the salt is acidified to form benzillic acid. Once the products of each step were obtained- benzil and benzillic acid- their melting points and IR readings were obtained. These two measurements were used to prove that the correct product was formed without any impurities. One of the major risks in this experiment is loss of product through multiple filtrations. To minimize this problem, the filtration steps should be carefully and slowly executed. This ensures that the least amount of reactants are lost. In addition, recrystallization can occur too quickly if a hot solution is directly placed in an ice bath, allowing impurities to be trapped within the precipitate’s crystal lattice. To avoid this, the solutions should be given ample time to cool to room temperature before adding the solutions to an ice bath. These precautions were taken to try to reach our goal of a high percent yield of product with little to no impurities. There were no new techniques used in this experiment, however there were old techniques used to provide information/obtain a product. The first technique was crystallization which was useful to obtain a solid product that can then be purified. Another old technique utilized was filtration, via hirsch funnel and vacuum. This technique was used to obtain a purified product, removing impurities. Once the final solid product was obtained in both reactions the melting point procedure was used to determine the level of remaining impurity of the final product, comparing the experimental and expected values found in literature. In conjunction with the melting point procedure, infrared spectroscopy was used to reveal the different functional groups of the products. In other words, the IR machine indicates whether our final product matches up with the desired one, matching carbonyl and alcohol absorption peaks (or the lack thereof) to their theoretical presence (either benzil or benzillic acid). Procedure: 1. 5ml of nitric acid was added to . 30g of benzoin in a conical vial with a stir vane. The mixture was then heated in a 70 degree Celsius water bath, while stirred, for one hour. The mixture in the conical vial was then cooled to room temperature and, using a pipette, the solution was transferred to a beaker containing 4ml of ice water. The mixture slowly crystallized in the beaker and the crystallized product was filtered on a hirsch funnel with vacuum. 5 ml of cold water was used to wash the product and then the product was allowed to dry. The solid product was then collected from the funnel and added to a hot 95% ethanol solution in an Erlenmeyer flask and completely dissolved. Once the solid was dissolved completely, the solution was allowed to cool to room temperature. Once yellow crystals formed, the solution was placed into an ice bath. The product was then collected and filtered again on a hirsch funnel with vacuum. The product was then washed with ice cold 95% ethanol. Once completely dried, the crystals were weighed and the final mass, percent yield, melting point, and IR reading of the crystallized product measured/calculated. 100g of benzil and . 30ml of ethanol were mixed in a conical vial. The solution in the conical vial was then heated to about 100 degrees celsius until the benzil dissolved. Then . 25ml of potassium hydroxide was added dropwise to the vial. The mixture was then heated to 110 degrees for 15 minutes, then allowed to slowly cool to room temperature. The product was transferred with a pipette to a 10ml beaker and cooled in an ice bath for 15 minutes. 1ml portions of ethanol were added once crystallized and filtered. The product was then transferred to a 10ml beaker with 70 °C water, allowing the product to dissolve. 0. ml of HCL acid was added dropwise and the mixture was allowed to cool and then transferred to an ice bath. The crystals were collected on a hirsch funnel and washed with 4ml of cold ice water. The crystals were dried and collected for final mass, percent yield, melting point, and IR reading. Results and Discussion: Table 1: Mass and Molar Quantity of Starting and Synthesized Materials; Percentage Yield and Both Experimental and Theoretical Melting Points of Products and Percent Discrepancy| Compound| Mass (g)| Quantity (mol x10-4)| % Yield| M. P. EXP ( °C)| M. P. THEO ( °C)| % D| Benzoin| 0. 298| 14| -| -| -| -| Benzil Yield| 0. 081| 3. 5| 27. 50%| 95. 6| 95. 0| 0. 632%| Benzil Start| 0. 1001| 4. 76| -| -| -|   | Benzilic Acid Yield| 0. 038| 1. 67| 34. 97%| 149. 5| 150| 0. 333%| The initial mass of benzoin and its yield of benzil in the first part of the experiment, as well as the starting mass of benzil and its yield of benzilic acid in the second part. Note that the yield from part 1 was not the same amount used at the start of part 2. Also shown: the converted molar quantity of each mass and corresponding percent yield for the two synthesized compound, as well as their experimental and theoretical melting points and percent discrepancy between these values. As noted, the â€Å"Start† weight of Benzil- in row 3 of Table 1- differs from the â€Å"Yield† weight- in row 2. The yield, itself, was not used in the second part of this experiment: the synthesis of benzilic acid from benzil. Furthermore, an error occurred in the second portion of the experiment and very little acid product was salvaged; thus, the yield shown for benzilic acid is data that has been shared from another synthesis (this product yield was from _____ and his lab partner). Additionally, this alternative product was the one used in determining a melting point. Graph 1 illustrates the successful oxidation of benzil, as the alcohol has been eliminated. As expected, it also retains a strong peak at ~1657cm-1, indicating the carbonyl groups present in the diketone, although this is a slightly lower absorption than expected. Graph 2 also presents a successful synthesis, as a relatively strong and somewhat broad peak appears around 3390cm-1, suggesting the reemergence of an alcohol and potential presence of the carboxylic acid; that the peak at 1715cm-1 remains strong, confirms his. SAMPLE CALCULATIONS Calculation of Benzil Percent Yield: Moles BenzilMoles Benzoin=. 081g? 210. 23g/mol. 298g? 212. 24g/mol=3. 85? 10-4mol14. 0? 10-4mol=0. 275? 100%=27. 5% Calculation of Benzilic Acid Percent Yield: Moles Benzilic AcidMoles Benzil=. 0380? 228. 25g/mol. 1001? 210. 23g/mol=1. 67? 10-4mol4. 76? 10-4mol=0. 3497? 100%=34. 97% Calculation of Percent Discrepancy in Benzil Melting Point: %D=xTHEO-xEXPxTHEO? 100%= 95. 0? -95. 6? 95. 0? =. 00632Ãâ€"100%=0. 32% Calculation of Percent Discrepancy in Benzilic Acid Melting Point: %D=xTHEO-xEXPxTHEO? 100%= 150. 0? -149. 5? 150. 0? =. 0033Ãâ€"100%=0. 33% Both steps of this experiment’s synthesis are considered successful. Though not in the desired quantities, a product of benzil was obtained from benzoin and that of benzoic acid from benzil. The initial step, synthesis of benzil, resulted in a yield of 27. 5%, despite an encouragingly smooth synthesis. The synthesis may have called for a second, more thorough recrystallization to appeal this yield. The recrystallization was performed correctly; however, the mixture was likely not allowed to cool at an ideally slow rate. It was removed from the hot plate and, shortly thereafter, transferred to the ice bath- likely, before it had calmed to room temperature. This could have interrupted the ability for the product to crystallize without impurities being trapped within its lattice. During the second portion of this experiment, a known, pure quantity of benzil was used to synthesize a 34. 97% yield of benzilic acid. This small yield is likely also due to factors similar to the aforementioned. Additionally, the recorded yield was shared from another synthesis; the original synthesis performed yielded too small and impure an amount of product to effectively determine a melting point and I. R. spectra. This failure may certainly be attributed to an error during the recrystallization, prior to the initial filtration. Proper care was taken to allow the solution to cool very slowly during this second recrystallization. Unfortunately, once the solution was transferred to the ice bath, a large chunk of ice crystals somehow fell over the lip of the flask and into the mixture. Being that the intermediate was relatively water How to cite Multistep Synthesis of Benzilic Acid, Essay examples