History of Fiber Optics free essay sample

Daniel Colladon and Jacques Babinet demonstrated the principle of guiding light by refraction. * It was followed by a public demonstration by John Tyndal in 1852. In 1870, Tyndal wrote about the property of total internal reflection in his book about the nature of light. * In 1880, Alexander Graham Bell and Sumner Tainter invented the Photophone, a device capable of transmitting sound waves over beam of light. This is considered as mankind’s first attempt to to use light for carrying information. * In 1930, Clarence Hansel and John Logie Baird demonstrated independently image transmission using fiber. * In 1940’s, Heinrich Lamm successfully transmitted images through a single glass fiber used for internal medical examinations. * In 1951, Harold Hopkins and Narinder Singh Kapany experimented with light transmission through bundles of fiber. Their study led to the development of the flexible fiberscope, which is used in the medical field. It was also Kapany who coined the term fiber optics in 1956. We will write a custom essay sample on History of Fiber Optics or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page * In 1953, Charles Townes and two of his graduate students developed the MASER (Microwave Amplification by Stimulated Emission of Radiation), and in 1960, Theodore Maiman developed the first LASER ( Light Amplification by Stimulated Emission of Radiation). In 1967, Charles Kao and George Bockham of the Standard Telecommunications Laboratory proposed the cladded fiber cables. * In 1970, Robert Maurer, Donalk Keck and Kapron of Corning Glass developed the first fiber optics with losses less than 2dB/Km. * In 1980’s, losses in fiber optics were reduced to as low as 0. 16 dB/Km. This is due to the development of high-quality light sources and detectors. * In 1990’s, the photonic crystal fiber was developed that can carry high power than the conventional silica based fibers.

The Wolf and the Buffalo essays

The Wolf and the Buffalo essays Throughout history mankind has had many social and racial inequalities. Sometimes its these inequalities that help motivate people to do certain things. In The Wolf and the Buffalo Kelton illustrates the social inequalities that existed in post Civil War Texas and between black and white soldiers and the blacks and whites against the Indians. Kelton also ties in the motives for people interacting with one another in the way that they do. Many characters in the book were motivated differently to do the things they did. However in the case of Gideon his motives changed a few times throughout the book. At first he was just saving up for a farm of his own, and then when he met Hannah she became his motivation. When she leaves his motivation temporarily checks out too. It dont matter. Everything I was savin it for is gone (210). He doesnt even care that Finley had stolen all of his money that he was saving for his farm because Hannah was out of his life. When the troops get lost in the desert and it looks like they will all die even Hollander loses his motivation to keep looking for water. Hollander extended his silver watch....he managed a few clear words. Wife. Give to my wife and baby.....Gideon replies, No! Youll live. You give it to her (358-9). Gideon reminded Hollander that his motivation WAS his wife and child and that they were enough to keep him going. Hollander does not forget Gideons actions because he later makes Gideon Sergeant for his leadership he showed. Gray Horse is motivated throughout much of the book by revenge because he thinks his wife and child were murdered. It seemed for a time that only by talking of revenge could Limping Boy kindle the flame of life in his cousins eyes. Anger would sometimes bring the heart to a strong beat, for a while (278). In this case it was revenge that moti...

Contract Assignment Essay Example | Topics and Well Written Essays - 1000 words

Contract Assignment - Essay Example With at least two forms –the vendors and the purchasers—vying for legal standing the courts find themselves adjudicating a battle of the forms. They must determine what form applies, if any, or, alternately, that neither form applies and by default, a given contractual dispute must be resolved by recourse to the Sale of Goods Act rather than by the terms and conditions set out by either firm. (â€Å"Sale of Goods Act C. 54† 1979) his was the judgement that the court arrived at in â€Å"GHSP INC v. AB ELECTRONIC LTD† [2010] EWHC 1828 (Comm) Case No: 2008 Folio 1353. Neither the form of the seller AB Electronic Ltd. nor that of the purchaser, GHSP Inc. was held to be valid In lieu of a specific contract the court relied on the â€Å"Sale of Goods Act, 1979†. This issue is of considerable importance for both buyers and sellers. Understandably, the sellers standard form will contain terms that are beneficial to the seller while the purchasers form will favour the purchasers interests. Often the determination of which contract is applicable will resolve the dispute, implicitly, in favour of the party whose contract is accepted by the courts. It is for this reason that a battle of the forms can have such great importance. For more than thirty years the courts have relied on Butler Machine Tool Company Ltd. v. EX-CELL-O Corporation (England) Limited† [1977] EWCA Civ 9 Case No. 172 B. No. 234 when confronted with a battle of the forms. Briefly, Butler contracted to produce a production machine for EX-CELL-O Corp. They produced a contract for production of said machine with a price, terms and delivery details. EX-CELL-O responded with acceptance of the price on their own form that contained different details, particularly as they related to additional costs incurred prior to their receipt of the machine. Butlers contract contained a clause allowing them to charge any price increases

Job interview Essay Example | Topics and Well Written Essays - 1000 words

Job interview - Essay Example This shows that Baqer is capable of handling tasks that require quick decision making. As a panel an interviewer, I feel that the Baqer Alhashimdid is fit for the job. Baqer Alhashimdid’s questions were technical and they required much thought before answering. The questions focused on one’s ability to make effective decisions fast. Baqer Alhashimdid’s questions were well formulated and could have helped in evaluating how much the interviewee would be able to deal with situations that involved dealing with problems that involved teamwork as is always the case in most organizations. Generally, the questions asked adequately challenging and effective in determining the potential of a person in handling a wide range of situations. As an energy manager, Baqer Alhashimdid’s always has to be competent in ensuring that the organization’s energy supply is reliable. This means that he must be well equipped with various mechanisms that help in the provision of energy taking into consideration the need for back-up energy sources. Having worked in a capacity that involved operations and maintenance scheduling, he is bound to help the company prepare for emergencies that may arise related to his department. As a good team player, he is bound to keep his staff motivated and in providing solutions in the event that conflicts

Human Resource Management Essay Example | Topics and Well Written Essays - 1750 words - 6

Human Resource Management - Essay Example However, this method has been reported to be ineffective because it deny trainees with an opportunity of interacting directly with their experts. Coaching /mentoring is a method that involves an expert in a particular field who is responsible for administering training. Case study method provides trainee with an opportunity to identify and discuss key issues in the work place to see the areas that may require some improvements. Simulation method entails imitation of the actual work experience where trainees are given a chance to try out and learn by performing the actual task. Finally, technology based training involve utilization of various technological devices to learn. Therefore, managers have been recommended to apply the above methods of training but more emphasis should be placed to coaching and technological based training methods because they have proved to be very effective. Further, managers should apply the four key steps of delivering a training program in order to meet trainees’ individual needs as discussed. Introduction Human resource manager play a significant role towards ensuring that training methods have brought success. Normally, human resource managers design various training programs and administer them to employees in order to increase their efficiency and achieve organisation goals/objectives. Human resource manager further employ a combination of group and individual methods to improve employees’ performance as well as to increase their efficiency. In above connection, human resource managers administer various training methods with an aim of increase organisation productivity. On the other hand, training methods being administered may be help to motivate employees to direct their efforts towards realization of organisation goals (Thompson, 2013). Further, training methods provide employees with growth opportunities whereby, employees can be in a position to execute their task more efficiently and effectively. Therefore, human resource manager should carry out an evaluation to see whether the various training methods administered were effective. However, if a training method was not effective, the manager may decide to make necessary improvements to ensure that training method has brought success. In addition, effective training methods may not only be beneficial to employees and organisation but also to the supervisor. This is because an effective training program minimizes the time that supervisor could have spent in supervising employees and hence, does not have to worry since employees are competent with their job (Bianca, 2013). Therefore, this study aims to provide a review of the training methods used to deliver training. Review the training methods used to deliver training Human resource manager is responsible for choosing the training method used to delivering training among his/her employees. However, various factors should be taken into consideration in order to ensure that the method of training utilized meets employee’s needs. Some of the factors that human resource manager should take into consideration when choosing a method of training to be applied include: manager should consider whether the available time will be adequate to cover all the training topics. Secondly, employee’s knowledge should be taken into consideration because not all methods of training can relevant. Some methods might be too technical to some employees while other may appear to be irrelevant. Therefore, the

The Positive Aspects Of Fast Food English Language Essay

The Positive Aspects Of Fast Food English Language Essay 1. The  job  opportunities offered by  fast food  companies Fast food  is consumed  so much by people on  daily basis. There are many fast food outlets in both developed and developing countries. People can easily  see  fast food  restaurants, such as McDonalds, Burger King, Kentucky Fried Chickens (KFC) and Pizza Huts in the street.  Fast food  industry offers more jobs opportunities to the people in  local  areas.  According to McDonalds Australia (2005), McDonalds Australia had 715 restaurants in 2002.  The demand for McDonalds product increases and many people, especially young people can  work  in McDonalds franchisees.  This shows that  fast food  companies successfully make a  contribution  in  solving social unemployment issues. Other studies also show that  university  students work temporally in  fast food  outlets so that their  salary  may  cover  their expenses during their study. This suggests that, to  certain extent,  fast food  industry has some positive effects on peoples life. 2. The convenience of fast food Many people in the  world  like  fast food because of its convenience. In the UK, many women do not have time to do shopping and cook for the family. Many working mothers easily  take  their children to go to the local fast food restaurants such as McDonalds or Burger King to eat. Schlossers (2002)  study  shows that the number of working women has increased significantly and more and more women spend less time cooking at home, therefore, their families spent more on  fast food  meals. McDonalds and KFC have launched many chains in some developing countries, such as China, India, Thailand,  etc. According to Rault-Wack and Bricas (2002),  fast food  industry offers people  convenience  and reduce the burden of cooking at home because  people  may  order  fast food by  telephone  or online so the food can be delivered  shortly. It is  very  easy and convenient to  have  fast food for a meal after  school/work. 3. The low price of fast food The price for fast food in  fast food  outlet is  very  low  thus  most families in the UK can afford to eat there.  Fast food  companies  make  their products as  cheap  as possible. According to Schlosser (2002),  fast food  companies try  very  hard to  buy  the ingredients as  cheap  as possible because even a few pennies difference in price is  important  for the success of their business. Based on  cheap  ingredients, fast food outlets can afford to  give  customers a  supersized  portion  for low price. Since most customers cannot resist a bargain, this strategy is  very  effective. It is  very  clear that the low  price  and  big  portion  make fast food more attractive to customers. People pay for fast food whenever they want to  have  it. The negative effects of fast food Fast food has many negative effects on peoples health. 1. Fast food with high salt and saturated fat Fast food  companies encourage people to eat a lot without realising the health issues that can lead to  disease.  Experts from the Medical Research Council (2009) have reported that fast food contains lots of salt and saturated fat.  Fast food is full of calorie, it is easy to be addicted to it and  take  in more calories than people need.  Most of these calories do come from fat and sugar. Eating too much fat and sugar can cause  negative  effects on human health. It is clear that  home  cooked fresh food is healthier than fast food cooked with cheap ingredients. 2. Diabetes caused by fast food The way that fast food  is cooked  and sold have  bad  effects on peoples health. In some developing countries, many children do not have enough food every day. According to Schlosser (2002), the author of Fast Food Nation, the disease caused by eating too much fast food has become the second biggest killer after smoking in USA. American people have suffered from diabetes, especially those who are over 50 years old, because they have eaten too much fast food in their life. Schlosser also states that Americans spend more money on fast food than they spend on higher education tuition fees every year. Meanwhile, British people suffer from eating too much fast food and some people have to  get  medical treatment. As mentioned above, fast food is high in fat, high in refined carbohydrates and high in sugar, but it is  low  in anything of nutritional element. Consequently, many people have got diabetes by eating fast food. In the United States, the case of middle-aged Caesa r Barber shows what happened to his health after eating fast food  frequently. He suffered from diabetes and heart attack. He sues McDonalds, Burger King and other fast food  compaies, claiming that his illnesses were partially those companies fault (Martindale, 2003). Oppositely, these  fast food  companies claimed that it was Caesar Barbers responsibility to choose if he should eat fast food or not. Caesar Barbers failed in this case, but the most  important  is that this case shows that fast food has  bad  effects on peoples health. Therefore, people should not eat fast food.  The  connection  between fast food and childrens obesity Many children go to  fast food  outlets immediately after school. They  like  fast food because they  think  that fast food is  tasty. They spend a lot of time eating fast food and chatting with their friends before they go home. Most fast food outlets offer  big  portions, such as Big Mac, double cheese burger, etc. Children do not want to eat anything for dinner. They do not  do  any  physical  exercises after eating a  big  portion  of fast food. It is  very  bad  that some children just  immediately  go to bed after eating fast food.  The parents from those  disadvantaged  families  do not look after their children properly and  they  allow  their children to sleep  immediately  after eating fast food.  The extra  fat  and salt  store  in childrens body that may  make  children overweight.  In the UK, the government introduced  healthy food  scheme  in schools for some years but still many children, especially those from single-parent families, eat  fast  food as their  dinner  after school. Studies have shown that the UK is the country that has more  fat  children than other European nations.  It is a  big  issue that some doctors  are concerned  about.  Hickmans (2005)  study  shows that obesity has tripled in the UK (p.8). He states that the  increase  of childrens obesity  has been accompanied  by the high sales of fast food.  More fast food  is sold  in  fast food  outlets, more children become  obese  as they are the customers that fast food companies target.  From the above  evidence  it can be seen that fast food is a one of the major causes of childrens obesity.  Conclusion Currently fast food  is consumed  by many young people, especially children in the UK.  On the one hand, fast food has some positive effects.  Fast food  companies open many outlets in the world so that they offer more employments to local people.  Fast food is  convenient  as it saving a lot of cooking time so working mothers do not have to  cook  meals for their children after work.  The  price  of fast food is  very  low  so most families, even those  disadvantaged  families can afford it. On the other hand, fast food contains high salt and fat so many adults  have  suffered from diabetes. Studies show that there is a strong  connection  between fast food and childrens obesity because most of  obese  children eat much fast food  frequently. Therefore, government should help those  disadvantaged  families and encourage them to  cook  fresh  food for their children. Additionally,  fast food  outlets should not be allowe d to  locate  near school premises.  Fast food  companies should not be allowed to  sell  big  portions to children. Meanwhile, working mothers should  manage  to spend more time cooking healthy  food  at home. With the efforts made by both government and parents, children can have more  healthy  diets and the number of children with obesity  will be reduced  sooner or later.

Women in The Fabliaux :: essays research papers

Females are portrayed in the Fabliaux as having certain distinct characteristics. In 'Les Quatre Sohais Saint-Martin';, 'The Chevalier Who Made Cunts Talk';, and 'The Miller's Prologue and Tale'; medieval women are portrayed in similar ways. Women are imaginative and therefor their thoughts must be controlled. They also, in the Fabliaux, crave sex and have sexually creative minds. These three Fabliaux texts present women that are similar and represent commonly held views about the female sex of the time.   Ã‚  Ã‚  Ã‚  Ã‚  Women in the Middle Ages were thought of as having wildly creative imaginations. They were capable of much more description and creativity then men. This is portrayed in 'Les Quatre Sohais Saint-Martin';. The peasant women, when presented with her husbands four wishes, begins to wish for pricks all over her husbands body. After first describing her husband's current state as 'soft and like a furry animal'; (lecture notes) she goes on to say that she wishes for big pricks, short pricks, curved pricks, strait pricks, and other kinds all over his body including his ears, knees, forehead, and abdomen. She does not merely wish for one, hard prick but instead lists all the types she can think of. Because the husband only wishes that the 'same comes to her'; (lecture notes) it is obvious that the wife is the one with the creative imagination. In 'The Chevalier Who Made Cunts Talk'; the women are also very imaginative. After the Chevalier rescues the three naked women's c lothes they decide to each present him with a gift as a reward for acting so honorably. The first grants him a loon. The second grants him the ability to make all cunts speak to him. The third, not wanting to be upstaged by the first and second, gives him the talent to make all assholes speak. It is here that the extents of the female imagination are demonstrated. The Chevalier finds these gifts to be so wild that he thought the girls were mocking him: ' 'Those meadow girls made fun of me''; (Guerin 233). In the Middle Ages a woman's imagination was considered a powerful thing that must be controlled. If a woman's thoughts were not controlled there could be drastic consequences like strange characteristics in children. The thoughts and actions of the women in these Fabliaux are representative of this wildly held belief among men.   Ã‚  Ã‚  Ã‚  Ã‚  The women in these three Fabliaux are also very interested in sex.

Marriage and Americans

Alicia Evans March 10, 2013 Review on Argo Mrs. Bornac MWF When the movie Argo began to play I thought to myself this movie may not have my interest. The Iran’s were very aggressive toward the Americans because they felt as if we were trying to harm them. I did not understand the language they were speaking. However, the film should have made the CC pop up at the bottom of the screen so we could at least read their conversations.When the Americans began to burn all of the files they had I started to question were they really trying to help the Iran’s or not. The Iran’s started to get serious by shutting the power off in the buildings so the Americans could not talk to anyone. I began to get curious about what would happen next. There were Americans still held hostage sixty-nine days later. Six Americans snuck out the back door because going through any other door would not have been a success. I wondered where they would go.They went to a safe place with a marrie d couple. I was happy the couple wanted to help them back to their freedom state. When the Iran’s noticed they were missing six Americans I knew they would try their best to find them. I felt as if they Guy Tony were a strong man to try and save those six Americans. He could have been home with his wife and little boy instead he wanted to help. Tony missed his son’s call and when he was able to call back no one was home. That was heart touching because he loves his family.Tony sent his son a happy birthday card and that was great. He watched television with his son also when they were on the phone some nights. Tony’s wife and son missed him a lot. The streets of Iran were dangerous. I could not visit that place because they obviously do not like Americans at all. Once I seen the bodies hanging from the cranium machinery my heart dropped. Those people do not deserve to die the way they did. Also the large Army trucks the Iranians drove around in was terrifying to me.They had these harsh facial expressions as they would stare at you into your eyes. When Tony introduced himself as Kevin Hartkins to the six Americans they were not excited at all. I would have been cautious because they were taking a chance with their lives. Each of the Americans was very afraid and I could tell by their facial expressions. They did not know if they would be alive nor die because Tony was a random guy saying he is going to rescue them. When the CIA did not want to help Tony I felt it was wrong because those were innocent people.I think Tony played his part well to defend the six Americans. Even when they would not help him he kept striving to set those people free. I was so anxious when they made it to the airport. The Iranians were staring at their passports for a long time which made me sit at the end of my chair as I continued to watch. I thought they were not going to be able to leave the airport because the Iran police said the Argo movie had to be verifie d. Luckily they made it through and I was happy.It was a relief for me when the pilot made the announcement, â€Å"Clear of Iran. † Overall Argo was a great movie and each of the Americans was set free. It was well put together by the director and cast members. Argo was an enjoyable yet thrilling movie. There were a couple times I was on the edge. I was eager to see what would happen next. Also I was frightened that the Americans were not going to make it back to the United States but they did. I would recommend watching this movie to see what our people go through.

The eNotes Blog Another Kind of Green How Studying Abroad Can Improve Your CollegeExperience

Another Kind of Green How Studying Abroad Can Improve Your CollegeExperience To study abroad or not to study abroad? Its a question that confronts college students on a frequent basis, introducing an inevitable flurry of related questions that plague us: when should I go? Where should I go? WHY should I go Well, in an attempt to help you tackle those questions for yourself, our editorial intern shares his experiences of studying abroad in Rome and lists the 5 things you will reap by the bucketload should you decide to take the leap (and take it from us, you definitely should!): You dont need to lose it to know that you had it good.  John Mayer puts it perfectly in his song Another Kind of Green, playing off the metaphor the grass is always greener on the other side. How many times in your life has it taken losing something to make you realize how good you had it? Although the song was referring specifically to relationships, this is true of so many other situations: a tough job, a class thats giving you a hard time, an initially socially awkward moment, drudging through practice for a sport Ive had this happen to me many times in life. Partly because Im a fickle person by nature and always second guess my decisions.   A girl I swore I wanted nothing to do with seemed like the greatest thing in the world the second I broke up with her. The one time this hasnt been the case is when I  studied abroad. This was the one time in my life that I knew I was having the time of my life while it was happening. Thats a really cool feeling to have. I remember FaceTimeing my mom while walking through the cobblestone streets of Trastevere (my neighborhood) with a huge smile on my face explaining my new life on the other side of the world (between her sobs and complaints that she missed me). Piazza Navona, Rome I lived and studied in Rome for four months the fall quarter of my senior year. I stepped foot for the first time into this unknown city and experienced a foreign culture, a brand new language, and a completely different way of life. Whats more, I knew no one on the other side. I made the trek from Los Angeles to New York to Rome all by myself, and nervously walked into my apartment and university solo. I felt like a freshman again. But I was rewarded. To say that I had the  time of my life  is an understatement. When people ask me how the experience of studying abroad was, its hard for me to speak words that do it justice. It was the most fun, unique, rewarding, and liberating time of my life. I can break up all my experience into five different aspects of my life that were satisfied like never before: 1. Culture:  Ive been a Southern California boy my whole life, growing up in Orange County, taking trips to San Diego, and attending college in LA. Ive ventured to other parts of the US, been to Mexico, but never have I  fully integrated  myself in another culture. The only way to do this is by living in another part of the world for an extended period of time, and opening yourself up to another cultures differences. It can be difficult at first I remember trying to ask for a cup of water at a pizzeria and the whole process took a full minute before the cameriere, or waiter, understood what I wanted. But this was perhaps the most rewarding part of my journey. Learning the ins and outs of a culture and its people allows you to rediscover yourself. I finally learned to dress appropriately; I stopped wearing athletic shorts and sweats to class and dressed like the Italians (although I refused to wear a jacket and scarf when its 75 degrees out like them).   Speaking the language with locals and soaking up all there is to know about life in Italy was invaluable. Experiencing the siesta or brief close in the middle of the day for shop owners to go to lunch was frustrating and unpredictable, but a natural part of life in Rome. Meals can seem like marathons at first; Italians sit down for several hours, with the focus on the gathering of friends and family rather than the consumption of food. Which brings me to my next point 2. Food:  The food in Italy is the best in the world. I dont think many would dispute this. Rome is in the heart of Italy, giving it both a tremendous history and   a solid blend of the different Italian dishes, from the seafood in the north to the pizza in the south. Every meal is a breathtaking roller coaster that  cannot  disappoint the taste buds. I found a new appreciation for dellacqua frizzante or sparkling water, and improved my cooking talents from poor to mediocre during this time (Ill just never be good). I could never get sick of a pizza margherita, although I did get to consume a wide variety of other foods in other parts of Europe while I was traveling.   And the gelato Regular ice cream will never satisfy you again! Tre pasti a pizzeria Gelato 3. Travel:  About every other weekend, my friends and I would pack up our backpacks (only one carry-on allowed), and take off (usually on RyanAir, a super cheap airline that can cost as low as 50 euros for a roundtrip flight!) for another part of Europe. This took careful planning and a few nights of staying cooped up in the apartment on the laptop with a couple Peronis. But now Ive seen every part of the world Im from (Italy, Germany, Ireland), as well as exploring other countries like Switzerland, Hungary, Spain, and England. Talk about adventures! Cliffs of Moher, Ireland 4. Friends: I was anxious at first about going to an unfamiliar place, attending an unfamiliar school, and speaking an unfamiliar language, let alone going with no one I knew! I was randomly placed into an apartment with seven other dudes, so I was hopeful that I would find someone I clicked with. Within a week, I had a tremendous group of friends and was stoked I hadnt bogged myself down with anyone from home. The experience would have been great either way, but making new friends with people who knew nothing about me was a great experience. I ended up meeting so many great people from all across the US and Europe alike, forming many great friendships. I still keep in contact with four or five of my friends from there, and if I had my wedding today a few of these people would be standing beside me. I learned more about myself and about what is important in life from these new friends than anyone else. I also picked up a few habits from them. My roommate was an avid guitar player so I developed up a new fascination for music, and picked up playing the guitar the day I was back in California. 5. Independence: I grew up more in my four months abroad than I did in four years of being at college. Fending for yourself, traveling on your own, protecting yourself from gypsies, doing your own laundry these were all new concepts to me that started to make me feel like the mature 22 year old I was supposed to be. Being away from mommy and daddy for four whole months was a new experience for me. Im by no means a mommas boy, but this time away from home was novel to me. However, I was never once homesick, and was eating up every second of studying abroad so much that I actually dreaded the return flight home (even with all the extra legroom a regular airline provides). I remember staying up til 4am, saying my last goodbyes and talking to my buds about our favorite restaurants, trips, laughs, and good times in Europe. Ive heard great things about peoples study abroad experiences from all over the world. No matter where you choose to study, I guarantee it will be a time you will remember, and that you will not come home the same person. I was told this and thought, how much can I really change? But after being back for a couple months, I realize Im not the same person, and Im extremely pleased with the changes (although my best friend, Derek, was a little freaked out at the woven necklaces I wear now). The grass IS greener on the other side of the world. Go study abroad. Once youre there, you wont look back or search for any other kind of green.   Take John Mayers advice.   Or just click here to hear a great song with some incredible guitar work. Stay tuned for parts two and three of Another Kind of Green, where Ill talk about tips to maximize your study abroad experience, as well as the process of readjusting to life back in the homeland.

Occupational lung disease is occupational asthma Essay Example

Occupational lung disease is occupational asthma Essay Example Occupational lung disease is occupational asthma Essay Occupational lung disease is occupational asthma Essay MOLECULAR MECHANISMS BY WHICH CHEMICALS CAN CAUSE OCCUPATIONAL ASTHMA Introduction Occupational asthma can be defined as a disease characterized by airflow restriction and/or airway hyper reactivity due to causes and conditions attributable to a peculiar occupational environment and non to stimuli encountered outside the workplace ( Bernstein et al. , 1993 ) . In most industrialised states, the most common occupational lung disease is occupational asthma and it was reported by Mantyjarvi et al. , 1992 that close to 200 agents are known to bring on occupational asthma. Chemical-induced occupational asthma is chiefly determined by the degree and manner of exposure to such chemicals. The mechanisms by which chemicals causes occupational asthma are non to the full understood and it is possible for common tracts to be shared. Some of the postulated mechanisms by which chemicals cause occupational asthma include immunological and non-immunological mechanisms. The immunological mechanism is non to the full clear but it can happen either through Ig E ( IgE ) dependant mech anism or non-IgE dependent mechanism. It was besides established from surveies that occupational asthma can be caused by more than one mechanism. Other postulated mechanisms include familial mechanism, pharmacological mechanism, neurogenic and airway redness ( Mapp et al. , 1994 ) . Compounds that cause occupational asthma can be classified into high molecular and low molecular weight compounds. Largely, low molecular weight compounds ( MW lt ; 1000KDa ) causes occupational asthma because they act every bit haptens as a consequence of adhering to bearer proteins and they besides contain chemically reactive groups ( Bernstein J.A 1996 ) . In contrast, bulk of high molecular weight compounds are either protein or carbonhydrate compounds unlike low molecular weight compounds that are largely chemicals. In this essay, much accent will be on the low molecular weight compounds because bulk of them are chemicals. Low molecular weight chemicals Some low molecular weight chemicals ( MW lt ; 1000 KDa ) are known as inducers of occupational asthma and are either IgE dependant or nons of low molecular chemicals that are IgE dependent include metals such as Ni, Cr and Pt, acerb anhydrides and pharmaceutical merchandises. Metallic elements Exposures to metals at work topographic point are known to do occupational asthma. Largely, when metallic compounds are inhaled, it can ensue in metal smoke febrility, bronchitis and chemical pneumonitis. Inhalation of metallic compounds at chronic degree consequences in chronic bronchitis, pneumonoconiosis and emphysema. Exposure to metals can happen at different occupational degree such as metallurgical industries, metal excavation, soldering and welding industries. Categorically, metals doing occupational asthma can be classified as ( 1 ) difficult metals, e.g. Co ( 2 ) passage metals, e.g. Zn, Cr, Ni ( 3 ) cherished metals e.g. Pd and Pt. Chromium exposure to chromium salts are known to bring on occupational asthma. Contact dermatitis consequences when worlds are exposed to chromium salts in workplace such as cement and pigment production, tanning and electroplating. Occupational asthma as a consequence of Cr is noted and observed by a history of contact dermatitis ( Chang-Yeung et al. , 1994 ) . Besides, nickel-induced asthma may be enhanced by cell-mediated hypersensitivity. Nickel worlds are exposed to nickel at workplace such as smelting and refinement procedure, excavation, milling and electroplating industries. In open workers, nickel doing asthma is rare unlike Cr which causes contact dermatitis. It was reported that nickel-induced asthma consequences when workers are exposed to nickel sulfate ( Malo et al. , 1982 ) . In some instances, specific IgE antibodies to nickel-human serum albumen conjugate have been reported ( Malo et al. , 1982 ) . Furthermore, nickel induced asthma can be enhanced by cell-mediated hypersensitivity as a consequence of transformed lymph cell found in patients with nickel-induced asthma ( Kusaka et al. , 1991 ) . Zinc different illustrations of zinc-induced asthma are common following exposure to exhausts of Zn oxide. Workers exposed to zinc in steel fabrication and insect powder industries, welding of galvanized Fe and exhausts of Zn oxide are known to hold occupational asthma. Metal fume febrility with cough and breath shortness are reported symptoms of fume zinc oxide exposure. Platinum exposure to platinum salts are widely known to bring on asthma. Workers exposed to platinum in chemical industries, excavation and refinement procedures are reported to hold occupational asthma. The most widely known Pt salt which causes occupational asthma is the halide salts. Platinum salts were found in allergic workers with a positive tegument trial and the wireless allergosorbent trial processs are used to observe specific IgE antibodies ( Pepys et al. , 1972 ; Biagini et al. , 1985 ) . Acid anhydrides Acid anhydrides used in epoxy and alkyd rosins such as hexahydrophthalic, trimellitic, phthalic and tetrachlorophthalic anhydrides consequences in hypersensitivity reactions in open workers. They tend to adhere with endogenous proteins to organize conjugates with antibodies and besides act as haptens with the antibodies observing the haptens ( Zeiss et al. , 1993 ) . They can besides unite with self-proteins to bring forth new, carrier-dependent antigenic determiners with antibody uniting sites being directed against a conformational alteration in self-proteins ( Zeiss et al. , 1993 ) . Trimellitic anhydride when trimellitic anhydride are coupled with proteins, new determiners are induced which are antigenic in nature. This is really similar to when trimellitic anhydride induces specific IgE, IgM, IgG and IgA antibodies against hapten. Lung diseases such as asthma, pneumonic disease-anaemia syndrome, and coryza are caused as a consequence of high degree of exposure to trimellitic anhydride. Tetrachlorophthalate anhydride ( TCPA ) high exposure to TCPA at workplace has been reported to bring on occupational asthma. Workers exposed to TCPA-conjugate showed a high addition in specific IgE antibodies in a study carried out by Chang-Yeung et al. , 1994. The degree of exposure to TCPA is really of import as workers removed from exposure showed a lessening in IgE antibodies degree ( Chang-Yeung et al. , 1994 ) . It was besides reported by Chang-Yeung et Al that airway hyper reactivity was absent but several types of hypersensitivity reactions were induced. Non-IgE dependant chemicals The molecular mechanisms for low molecular weight chemicals which are nons of chemicals which are non-IgE dependent includes ; Diisocyanates Diisocyanates are chemicals which have N, C and O group. These groups are attached to a extremist and react with compounds such as polyglycols to organize polyurethane. They are extensively used in industries and are known as inducers of occupational asthma. They are low molecular weight compounds synthesised when there is a reaction between their hydrochlorides or aminoalkanes with phosgene. Pre-polymers of diisocyanates such as methylbenzene diisocyanate ( TDI ) , methyldiphenyl diisocyanate ( MDI ) and hexamethylene diisocyanate ( HDI ) are known to do occupational asthma. Chang-Yeung et Al ( 1994 ) reported that the most common cause of occupational asthma in many industrialised states is toluene diisocyanate. Furthermore, hypersensitivity reactions which are cell-mediated have been observed in open workers. Although the mechanisms of TDI-induced asthma is non to the full understood but it was reported that they show belongingss which are similar to that of ?- adrenergic encircle ment. Furthermore, MDI is besides an inducer of occupational asthma. Exposed workers seem to hold specific IgE and IgG antibodies which indicate sensitisation instead than a disease. The mechanism by which MDI induced occupational asthma is non to the full clear. HDI are extensively used in aircraft and car spray pigments and are more volatile than TDI. The mechanism by which HDI induced asthma is non clearly understood but instances of HDI exposure have been reported in literatures ( Bohner C.B. et al. , 1941 ) . Besides, intracellular glutathione lack can be induced by diisocyanates which in bends lead to the activation of mitogen-activated protein kinase. The degrees of intracellular peroxide additions in workers exposed to diisocyanates and adhesion molecule in monocytic cell lines are expressed ( Elms J et al. , 2001 ) . Plicatic acid ( PA ) Plicatic acids are low molecular weight chemicals which are present in forests and are known to do ruddy cedar asthma ( Harris MG et al. , 1977 ) . The molecular weight of plicatic acid is 440 K Da. Allergen is formed when there is a junction between plicatic acid and human serum albumen. Patients with ruddy cedar asthma have been reported to involved in histamine release but recent surveies indicates that specific IgE antibodies are non responsible for the histamine release. Further surveies are required as the mechanism by which PA-induced asthma is non to the full understood. Amines Amines are widely used in primary and secondary fabrication industries such as cosmetics, hair dye, gum elastic and pelt industries ( Wernfors M et al. , 1986 ) . Quarternary, third and secondary aminoalkanes either aromatic or aliphatic are known as inducers of occupational asthma. The molecular mechanism by which asthma are induced by aminoalkanes still remain ill-defined. Formaldehyde Formaldehyde is a chemical that induce occupational asthma through non-immunological mechanisms. In lower concentrations, they serve as sensitiser and at high concentrations, they are thorns. Assorted surveies have been carried out to observe specific antibodies in open workers but they are yet to be successful but it was reported that degrees of bronchoconstriction between 1-2ppm were observed in open workers ( Nordman H et al. , 1985 ) . Decision Mentions Mantyjarvi J et al. , ( 1992 ) , IgG and IgE antibody responses to overawe dander and piss in husbandmans with cow-induced asthma. Clin Exp Allergy 1992 ; 22: 83-90. Bohner CB et al. , ( 1941 ) , Sensitivity to gum acacia, with a study of 10 instances of asthma in pressmans. J Allergy 1941 ; 12: 290-294. Harris MG et al. , ( 1979 ) , Isocyanate asthma: respiratory symptoms due to 1,5 naphthylene diisocyanate. Thorax 1979 ; 34: 762-766. Wernfors M et al. , ( 1986 ) , Phthalic anhydride-induced occupational asthma. Int Arch Allergy Appl Immunol 1986 ; 79: 77-82. Chan-Yeung M et al. , ( 1994 ) , Aetiological agents in occupational asthma. Eur Respir J. 1994, 7, 346-371. Bernstein, I.L et al. , ( 1993 ) Definition and categorization of asthma. In: I.L, Bernstein, M. Chang-Yeung, J-L.Malo and D.I. Bernstein ( Eds ) , Asthma in the workplace, 1st Ed. , Marcel Dekker, New York, pp.1-4. Elms J et al. , ( 2001 ) , Mechanisms of isocyanate sensitization. An in vitro attack. Toxicol In Vitro 2001 ; 15: 631-634. Sastre J et al. , ( 2003 ) , Pathogenesis of occupational asthma. Eur Respir J 2003 ; 22: 364-373. Deschamps F et al. , ( 1998 ) , Mechanisms of occupational asthma induced by Isocyanates. Ann occup, Hyg. , Vol.42.No, 1.pp.33-36. Bernstein J et al. , ( 1996 ) , Overview od diisocyanate occupational asthma. Toxicology 111 ( 1996 ) 181-189. Map C.E et al. , ( 1994 ) , Mechanisms and pathology of occupational asthma. Eur Respir J, 1994, 7, 544-554. Malo JL et al. , ( 1982 ) , Occupational asthma caused by nickel sulfate. J Allergy Clin Immunol 1982 ; 69: 55-59. Block GT et al. , ( 1982 ) , Asthma induced by Ni. J Am Med Assoc 1982 ; 247: 1600-1602. Kusaka Y et al. , ( 1991 ) , Lymphocyte transmutation trial with Ni in difficult metal asthma: another sensitising componenet of difficult metal. Ind Health 1991: 29: 153-160. Pepys J et al. , ( 1972 ) , Asthma caused by the complex salts of Pt. Br J Ind Med 1945 ; 2: 92-98. Biagini RE et al. , ( 1985 ) , The diverseness of reaginic immune responses to platinum and palladium metallic salts. J Allergy Clin Immunol 1985 ; 76: 794-802. Nordman H et al. , ( 1985 ) , Formaldehyde asthma: rare or overlooked? J Allergy Clin Immunol 1985 ; 75 ; 91-99. Agius R.M et al. , ( 1991 ) , Structure activity hypothesis in occupational asthma caused by low molecular weight substances. Ann. Occup. Hyg. Vol 35, No.2.pp 127-137.

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A Successful Leader Essay Example | Topics and Well Written Essays - 2250 words

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