Ethics of Biobanks

Ethics of Biobanks Biobank is a large collection of biological information and tissue samples kept for research purposes. It is also a powerful tool used in the study of diseases. It is an important resource in supporting different types of contemporary research such as personalised drug and genomics. Biobank enable scientist to have cross purpose research studies in which data derived from samples in biobanks can be used for multiple researches. E.g. Biobanks can enable scientist identify disease biomarkers by using large collections of samples which represent hundreds of thousands of people. Its been shown that before biobanks was invented little or known was known about different disease and biomarkers and scientist struggled to find enough samples to know what sort of disease they are dealing with. Although its not all good news for the use of Biobanks due to research ethics and medical ethics. This issues were raised because of PRIVACY whereby operating biobanks without the knowledge of governing bodies and policies could be bad for the societies that take part in Biobank programs There are types of biobanks, Tissue banks and Virtual biobanks and population banks, before I explain the types Im going to explain a lot more about biobanks Biobanks incorporate cryogenic storage facilities for samples in which it can be an individual refrigerator or a big warehouse refrigerator. They are kept up to standard by the hospital, pharmaceutical companies and universities etc. Disease oriented biobanks may be classed by design and purpose because this biobanks collect information or samples representing different forms of diseases in which it can be used to also find a biomarker associated with a specific disease. Population based biobanks are big biobanks that collect large samples from large numbers of people in a community. This is done to look for biomarkers for disease in a general population. Tissue Banks- Store and harvest human tissue for transplantation, stem cell and researches based on tissue and cells Virtual biobanks samples are collected and termed to meet national regulations and integrate epidemiological cohorts Population banks they store organic material associated with clinical, lifestyle and environmental data. Biobank ethics There are many roles which comes into effect when researchers wants to collect a human specimen for research and storing it. The issues that comes into effect are the right of the participants to be private, ownership of the specimen and where the data is derived from. Also how far the donor can consent to the research study should be considered and to which extent the donor can far in sharing research results. The main issue is that biobanks collect sample and data for different future research and it is not easy to get a specific consent for any single research. Biobank controversies[1] issue consensus controversy notes Commercialization Different aspects of biobanks serve public, private, commercial, and non-commercial interests. How can policymakers set guidelines to fairly balance public, private, commercial, and non-commercial interests? Who owns biological specimens and data derived therefrom? When biobanks and related projects are publicly funded, the result will benefit private industry. To what extent is this outcome satisfactory? (Social Fairness). It may also undermine public trust in biobanks projects. It may skew research agenda in favour of research projects which are more profitable and compromise necessary but not profitable research. discrimination, including Genetic discrimination Biobanks should prevent donor communities from facing discrimination as a result of participating in a Biobank project Research reveals private information and release of it may cause participants to face discrimination. What responsibility does the Biobank have to mitigate the problem? Participants may reveal their own information because of participation in a Biobank and subsequently face discrimination. What responsibility does the Biobank have to mitigate the problem? informed consent Donors to biobanks need a consent process adjusted specifically to biobanks. What breadth of consent should biobanks have? [2] Institutional review board It would be nice to have a robust governance system before biobanks are created. How will a good governance system be designed? The oversight institution reviewing biobanks should be independent of the Biobank. Where should checks and balances be? An individual organization needs multinational support to do international research. Who should govern when research spans different countries with different legal and personal rights standards? Privacy for research participants Donors should have their specimens sufficiently anonymised. A specimen by nature includes some data about donors how much anonym zing is sufficient? [3][4] Donors have some right to return of results. How does one return results to anonymised donors? [3][5] Donors have a right to withdraw from research. Specimens can be destroyed, but to what extent should anonymised data which has already been shared be withdrawn? [5] Data derived from specimens should be shared. Who gets access and how much? [3] Changing technology makes it difficult for researchers to say how safe participant information is. What protections can be promised? [6] Return of results Donors have a right to know the purpose of a Biobank and what results it generates When should all donors share general information and when does each donor have a personal right to personal information? Public consultation Everyone wants the researchers and community to work together. What resources should be spent doing outreach, and how much involvement does the community want, and what role should the community have? Communities should participate in writing laws, standards, and policies for research. How can communities be encouraged to participate, who represents the community, and how much involvement should there be? Patients should be involved when there is research on diseases. When people are desperate because of a disease, to what extent can they participate fairly without feeling obligation to support research? Communities which donate specimens to a Biobank should have special involvement in their Biobank. What kind of involvement? Resource sharing Research efficiency increases greatly when resources are shared. How should beneficiaries share costs? This is especially problematic when a Biobank is a national resource and another country wants access to it. Results of studies should go to the widest possible audience. When should this happen and in what way? Can results be released with commercial licensing for use?

Breakfast of Champions Essay -- Essays Papers

Breakfast of Champions When one hears the phrase â€Å"Breakfast of Champions,† he envisions a grinning picture of Tiger Woods, Michael Jordan slam dunking, or Dale Earnhardt in a racecar on a box of Wheaties, a popular breakfast cereal. A few avid Saturday Night Live fans might recall a skit performed by James Belushi. In the skit, Belushi’s â€Å"Breakfast of Champions† was beer, cigarettes, and donuts. Neither of these examples are the subject of Kurt Vonnegut’s Breakfast of Champions or Good Bye Blue Morning. A â€Å"Breakfast of Champions† is actually a martini. Breakfast of Champions is a work of fiction with semi-autobiographical allusions. The main characters of the book are Kilgore Trout, Dwayne Hoover, and Philboyd Sludge. Kilgore Trout installs aluminum combination storm windows and screens and writes science fiction novels and short stories. He has no ambition to be a famous writer, so he sends his works to pornographic magazine companies to be published. The names and characters of his works are often changed in the process, and he is rarely paid for his efforts. Dwayne Hoover owns a successful Pontiac dealership. He slowly loses his sanity as the plot unfolds. Philboyd Sludge creates these characters and appears in the story to watch the characters as the story progresses. Breakfast of Champions depicts the story of Kilgore’s travel to Midland City to speak at a festival of arts. Kilgore, at first, rejects the invitation, but he decides to go because h... Breakfast of Champions Essay -- Essays Papers Breakfast of Champions When one hears the phrase â€Å"Breakfast of Champions,† he envisions a grinning picture of Tiger Woods, Michael Jordan slam dunking, or Dale Earnhardt in a racecar on a box of Wheaties, a popular breakfast cereal. A few avid Saturday Night Live fans might recall a skit performed by James Belushi. In the skit, Belushi’s â€Å"Breakfast of Champions† was beer, cigarettes, and donuts. Neither of these examples are the subject of Kurt Vonnegut’s Breakfast of Champions or Good Bye Blue Morning. A â€Å"Breakfast of Champions† is actually a martini. Breakfast of Champions is a work of fiction with semi-autobiographical allusions. The main characters of the book are Kilgore Trout, Dwayne Hoover, and Philboyd Sludge. Kilgore Trout installs aluminum combination storm windows and screens and writes science fiction novels and short stories. He has no ambition to be a famous writer, so he sends his works to pornographic magazine companies to be published. The names and characters of his works are often changed in the process, and he is rarely paid for his efforts. Dwayne Hoover owns a successful Pontiac dealership. He slowly loses his sanity as the plot unfolds. Philboyd Sludge creates these characters and appears in the story to watch the characters as the story progresses. Breakfast of Champions depicts the story of Kilgore’s travel to Midland City to speak at a festival of arts. Kilgore, at first, rejects the invitation, but he decides to go because h...

breast cancer Essay -- essays research papers

Breast Cancer   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Breast cancer is the most common cancer among women. The American cancer society estimates that in 2002 about 192,200 new cases of breast cancer will be diagnosed among women in the U.S. alone. Breast cancer also occurs in men. An estimated 1,500 cases will be diagnosed among men. In 2002, there will be about 40,600 deaths from breast cancer in the United States.   Ã‚  Ã‚  Ã‚  Ã‚  What is breast cancer? Breast cancer is a malignant tumor that has developed from cells of the breast. To make it easier I’ll put it this way. When the body needs new cells they will divide or reproduce. Sometimes the cells grow and divide out of control, which creates a mass of tissue called a tumor. Now if the cells that are growing out of control are abnormal and don’t function like the body’s normal cells the tumor is then called malignant or cancerous. Cells from the malignant tumors can invade and damage nearby tissues and organs. They may also travel through your blood stream or lymph system to other parts of your body. If the cells are normal cells the tumor is called benign or non cancerous. This Disease occurs mostly in women, but dose occur rarely in men. There are many stages of breast cancer. Stage 0 breast cancer is when the disease is localized to the breast and lymph nodes. Stage 1 is when the cancer is smaller than 1 inch across and hasn’t spread. Stage II is one of the following: the tumor is less than one inch but has spread to the underarm lymph nodes or the tumor is between 1-2 inches without spreading. Advanced breast cancer results after cancer cells spreads to the lymph nodes and to other parts of the body. Stage III breast cancer is also called locally advanced breast cancer. The tumor is now larger than 2 inches and has spread to the lymph nodes under the arm, or a tumor that is any size with cancerous lymph nodes that attach to each other or surrounding tissue.   Ã‚  Ã‚  Ã‚  Ã‚  Stage IIIB breast cancer is a tumor of any size that has spread to the Skin, Chest wall or internal mammary lymph nodes, which are located beneath the breast and inside the chest.   Ã‚  Ã‚  Ã‚  Ã‚  Stage IV breast cancer is defined as a tumor that has spread to places far away from the breast, such as bones, lungs or lymph nodes.   Ã‚  Ã‚  Ã‚  Ã‚  There are... ... no way to prevent breast cancer but there are a ton of things you can do to help reduce your risks of getting it. You should always eat foods high in fiber. Fiber helps reduce the amount of circulating estrogen in your body. Eat plenty of fruits and vegetables, also include soy in your diet. Studies say that soy may inhibit the development and growth of cancer cells. Limit the fat in your diet, limit alcohol, and stay physically active. The Nurses Health Study found that women who exercise for at least 1 hour a day reduce their breast cancer risk by 18 %. You should also maintain a healthy weight and avoid exposure to pesticides. Because the molecular structure of some pesticides closely resembles that of estrogen. This means that they might attach to receptor sights in you body. It is known that women with high levels of pesticides in their breast tissue have a greater breast cancer risk.   Ã‚  Ã‚  Ã‚  Ã‚   Although there are many different things that go along with breast cancer. This paper really helped me understand more about the subject and helped me know some of the signs that I need to look for and ways to help me reduce the risks of getting breast cancer.

The Importance of Giving It Your All Essay -- Personal Narrative

The Importance of Giving It Your All It was a crisp autumn afternoon; the sun was shining and the parched leaves rustled as a cool breeze waltzed through. Today was the day I had anticipated, the day I would go and take the Elementary School Gifted Program test. This was my goal, to succeed the gifted program and be known at the top of my class. I was a little nervous, but I ignored my sweaty palms and scratchy throat as I followed slowly behind my mother, because I knew I had to do this. An elderly woman opened the door. She was slender and fragile-looking. She had thick gray hair that was pulled tightly back into a sleek professional bun. She wore a beige woven sweater with the sleeves rolled just above the elbow and black, freshly pressed slacks. The woman introduced herself as Sandra Schmidt and invited us in. After settling my mother in the family room, she immediately took me to the back of the house where a small card table and two fold-out metal chairs were set up. We sat down and promptly began. She asked me myriad verbal questions of varying degrees of difficulty,...

Letting Nature Speak

Letting Nature Speak If you were walking in the woods and suddenly a tree started speaking to you, most likely you would either faint or start running the opposite direction. It would be pretty scary, to say the least. But nature does speak to everyone in a sense; we are just so busy with life that we do not take the time to listen. There is so much in nature that we can learn from and apply to our lives, but so often we only look at it for its face value and do not see the deeper benefits.Speaking of nature, as I stand outside on the back porch, the sun is shining and the birds are singing, the smell of freshly cut grass fills the air and the mild breeze feels so refreshing on my skin. In the background I can hear the faint sound of traffic on the highway, cars busily heading to their destinations. It has been breezy for a couple of days now, but the sun is shining and the clouds are moving. As the day progresses, the wind speed increases and the temperature steadily decreases makin g a visit to the porch a little less comfortable than it was this morning.The humidity level has steadily increased as well, making my clothing sticky and somewhat annoying, also causing my paper to become limp and not as easily manageable. The clouds seemed to be huddling together as if forming a mob, moving in slowing overhead creating a blanket between the sun and me. My pleasant sunshine has been taken away from me now and I am left with a gray blanket of cloud cover to observe, I am picking out different shapes and possible figures within them. As the clouds continue moving by, more ominous clouds replace their predecessors, making the world around me darker and darker.The temperature is cool and the breeze is stronger than it was earlier. I hear thunder rumbling in the distance, a normal precursor to a storm. The thunder seems like a would be stalker approaching from the darkness, only his footsteps are so loud it shakes the earth and rattles the windows, demanding its presenc e be known. Lightning flickers like a streetlamp attempting to turn on, but continually failing. One drop of rain lands on my cheek, another on my arm. As the rain increases in quantity, I head inside and continue watching from my window.Slowly the rain changes from a lawn sprinkler type shower to more like someone turning on a high-pressure water hose as if they were trying to douse a fire. I am now confined to my home, as if there is an army outside keeping me contained unless I want to endure their unrelenting siege. The troubles in life are much like a storm; there are always signs of it brewing but so often we are caught up in the beauty of the moment that we do not see the thunderheads rolling in behind us until it is too late.We are then caught off guard without an umbrella in the pouring rain. The rain soaking our clothes and in turn our body, is like the stress that comes with trouble forcing us to try and find shelter or something to protect us. When caught in a storm, we rarely see the beauty of it because we are focused on the damage it is causing. After a storm the grass is greener, the air smells so fresh, the sidewalks are washed clean, and there is a sense of calm and reassurance that we have made it through. The sun raises its head and always gives us a rainbow after the storm.There is a lot more to the sun then rainbows and illuminating the world as Ralph Emerson states in â€Å"Nature,† â€Å"Most persons do not see the sun. At least they have a very superficial seeing. The sun illuminates only the eye of the man, but shines into the eye and the heart of the child† (563). This is so true; often nature is only seen for its face value. Sunrise is a particularly beautiful, natural event to experience, and all to often we do not take the time to enjoy the wonderful events that unfold during a sunrise.As the sun is approaching the horizon, I hear birds singing and nocturnal animals scurrying back to their dens to sleep the day away. The birds seem to be calling to one another as if they are old men sitting at the local cafe, drinking coffee and discussing the day’s to-do list. The sky is no longer black but a deep ocean blue, like someone has turned on a light in another room, and the light is reflecting throughout the house. I hear the leaves rustle in the wind, and the trees sway as if they are stretching after a deep sleep.Slowly, things in the distance become recognizable and I can distinguish more shapes and figures. The sky becomes brighter and brighter, changing from a deep blue to a brighter shade as the sun moves closer to the horizon. Faster and faster light is filling the sky and illuminating the world around me. It is almost like opening my eyes when I awaken and taking in all the colors and objects around me. Suddenly the sun shows its bright and shining face, peeking over the horizon as if to say good morning to me.It rises slowly, becoming more and more visible, until its entirety is now shining down on me, demanding to be seen, demanding my attention. I feel the warmth on my skin, like a blanket pulled up over me. The sunrise is so beautiful but when the sun comes up all the way it doesn’t always seem as wonderful, especially if there is a lot of it. This last summer we experienced an enormous amount of the sun and the heat that comes with it and the effects seemed all negative. It caused droughts, crops to wilt, electric bills were high in the effort for the air conditioning to keep up with the heat and the list could go on.But there were some benefits to the high heat and drought. I was able to spend plenty of time inside my home this summer and I was able to downsize a lot of my belongings. My home stayed very clean all summer long because I did not want to be out in the heat and I took advantage of the time inside. I was able to catch up on my movie watching and shows that I was missing out on. I have to admit, I did miss taking my children to the park, but I was able to spend quality time with them when we were cooped up inside.Another advantage to the drought and high heat is the crime rate was lower this summer; criminals do not like the heat just like everyone else. But what is a thunderstorm or a drought in comparison to something as devastating and tragic as a natural disaster that kills thousands and leaves even more without a home. Hurricane Katrina ripped through New Orleans leaving in its wake, destruction and death. Causing many to wonder how could anything good come out of such devastation. At first there did not seem to be anything positive.Then as the clouds lifted and the water receded, people started to pull together and found in the midst of tragedy, a sense of community. Barely two months after the devastation of Hurricane Katrina, the New Orleans’ art community pulled together and reopened the doors of the Ogden Museum with an incredible turn out on opening night (Krantz). Before Katrina, the turnout staye d about 100, but over 600 citizens crammed the affair, an enormous result (Krantz). Nature has its own lessons, whether teaching us to be prepared or to look deeper and find the treasure beneath the rubble.Wearing its many different faces, nature will always put us to the test. Whether enjoying the beauty of a sunrise or the thrill of a thunderstorm rolling in, there is always something to walk away with; the beauty is in the eye of the beholder. Works Cited Emerson, Ralph Waldo. â€Å"Nature. † Sound Ideas. Ed. Michael Krasney and M. E. Sokolik. Boston: McGraw-Hill, 2010. 562-564. Print. Krantz, Susan E. â€Å"When Tragedy Inspires Recovery: Visual Arts In Post-Katrina New Orleans. † Phi Kappa Phi Forum 90. 2 (2010): 8-11. Academic Search Premier. Web. Oct. 25, 2012.

Technology in Satellite Internet

Technology is getting better each day. The Internet is one of the best, if not the best, technology that was invented on this century. Internet allows us to see the world that we have not seen. Internet widens our knowledge on certain perspectives and information. Internet makes learning easier and more accessible as compared to the past century before it was invented. It allows us to see places that we cannot see physically. In short, it gave us the world of easier and more accessible pool of knowledge. Dial-up Internet access was the first innovation that was used to connect to the Internet. This type of Internet connectivity connects through the Internet using the customary telephone line. The telephone line is then connected to a modem, a device that needs to be attached on the computer to allow internet access. By configuring the computer to dial up a specific telephone number of an Internet Service Provider (ISP), Internet is already accessible. The next innovation used to connect through the Internet was the Digital Subscriber Line (DSL). This type of Internet connectivity was the widely used type of Internet connectivity on these days. Compared to a dial-up connection, DSL is faster as they are designed for use with high-speed DSL connections. Recently, another innovation in Internet connectivity was introduced to the market, the satellite Internet. Satellite Internet, from the name itself, connects to the Internet using satellite. The outgoing and the incoming data are sent and arrive at the computer through the satellite. Hardware that is needed to be installed on the computer to have this type of internet connection includes satellite dish antenna and a transceiver which works in the microwave portion of the radio spectrum. This type of Internet connection is recommended for residents and business establishments that do not have access on DSL or cable internet on their location. This research paper aims to take a closer look on the technology behind satellite Internet. What is satellite internet? Satellite Internet provides Internet through satellite. It is connected to a dish network subscriber service. The speed that satellite internet provides is just the same as those provided by other broadband technologies. However, not all locations have DSL or cable internet providers. Some rural areas lack DSL and cable internet service. Satellite Internet solves this problem for it can be connected anywhere as long as there is electricity to power a computer system. There are three types of services offered in satellite internet: (1) One-way multicast; (2) One-way with terrestrial return; and (3) Two-way satellite access. IP multicast-based data, audio, and video distribution are the usage of one-way multicast satellite Internet systems. This type of service is recommended for TV and radio contents as they need modest user interface. This happens because full interactivity is not possible for this type of service. FCC license is a requirement in the United States for the uplink station though there it is not needed for the users. Because of this, most Internet protocols does not work adequately on one-way access because a return channel is needed. By pushing to a local storage at end user sites, webpage can still be distributed on the Internet. Interface to the Public Switched Telephone Network for squawk box application is a system hardware component needed for this type of service. On the other hand, custom programming at the remote site is needed for the system software component. Filter, store, present a selection interface to, and display data are the tasks needed to be performed by the software at the remote site. While provision of access control, priority queue, sending, and summarizing of data are the tasks needed to be performed by the software at the Teleport. Used with a dial up access to the Internet, together with outbound data traveling with the use of a modem, one-way terrestrial return satellite Internet systems downloads are sent through satellite having the speed almost the same as those offered speed by other broadband Internet services. The transmitting station or the Teleport is needed component of system hardware. This transmitting station has two components: (1) Internet connection and (2) Satellite uplink. Minimum programming that can provide authentication and set Proxy server settings are needed by the remote sites, which is the system software component. Compared to a dial up modem, this type of satellite Internet service’s speed is faster and latency is higher. Speed of download is faster than dial-up modem but slower than terrestrial broadband methods. According to sattellitemaps. om, two-way satellite Internet sends data from remote sites via satellite to a hub, which then sends the data to the Internet. To avoid obstruction with other satellites, the satellite dish must be accurately positioned on each location. Obstruction with these systems can be caused by oscillators in various radar detectors. To adjust the amount of transmit power, each location is required to use power management. TDMA and S CPC are the two types of two-way satellite Internet. Internet speed for this type of service uncommonly exceeds one megabit per second and the latency can reach up to one second. Speed, in general, for satellite Internet can be two-megabits per second (Mbps) for downstream and one-megabit per second for upstream. On the other hand, a typical dial-up Internet connection speed reaches only 53 kilobits per second (Kbps). Therefore, satellite Internet is by far faster than a dial-up Internet connection. Though satellite Internet solves the problem of those who live in areas that do not have DSL or cable Internet services, it still has its drawback. It is generally expensive as compared to dial-up and DSL connection. High latency, which means signal delay, is another drawback of satellite Internet. A request for a webpage from a satellite Internet subscriber travels 22,300 miles to reach a satellite in a geostationary orbit. Another 22,300 miles is traveled by the signal upon reaching the geostationary orbit back to the earth. Lastly, another 22,300 miles must be traveled for the signal to reach the user. All in all, the total distance traveled by the information is 89,200 miles. The total distance is what the user is paying for this type of Internet connection. Average latency, on the other hand, is approximately 500-700 milliseconds. In short, latency cannot be avoided in satellite Internet. Thus, it is not recommended for some Internet activities such as multiplayer online gaming. In general, satellite Internet is by far faster than a dial-up connection but still slower as compared to other broadband technologies such as DSL and cable internet connection. How does satellite internet works? The Technology behind the Innovation The large satellite dish is the hub station. Its average diameter ranges from 6 meters to 32 meters. Receive gain is dependent on the size of the satellite dish. The large size of the satellite dish brings high receive gain and sensitivity. Transmit power is minimized through the large dish. The large size also brings high transmit gain at the same time minimizes the transmitter power at the hub. A router to interface to the external ISP network, DVP-IP encapsulator that will insert the IP data into a format of MPEG-2, DVB multiplexer, continuous modulator, timing clock, up-converter, and high power amplifier are the transmit Hub Common Equipment (HCE). Meanwhile, low noise amplifier, down-converter, timing and distribution of MF-TDMA demodulator unit and multiple MF-TDMA demodulator units for each inbound carrier to be received simultaneously are the components of receive HCE. Having high sensitivity is a requirement for the satellite uplink so it can function well in small dish transmits services. If the uplink beam coverage area is small, high sensitivity is easily achieved. Adequate high gain setting is also a need for the satellite transponder. This will be easily achieved but it should be specified fist before satellite construction begins. Through a remote control of a gain step attenuator, adjustment of the gain of satellite is possible. On the other hand, a lower gain setting is preferable for large dish services. Frequency bands for satellite internet can be any of the following: (A) C band 4/6 GHz; (B) Ku band 10-12/14 GHz; or (C) higher Ka band. Among all the customer terminals, a large outlink carrier from the hub is shared. It has a bit rate of 60 Mbits/s rate. It is also ETSI-compliant for modulation and FEC. Quadrature or 8 Phase Shift Keying (QPSK or 8-PSK) is the format of the outlink carrier. The following are the ways of transmitting digital data. For a particular bit rate, both need the approx and the same power from the satellite but 8-PSK concentrates the power into half the bandwidth (VSAT, 2005). 8-PSK becomes viable with dual satellite transponder bit rate capacity if there is a powerful satellite and maybe larger remote terminals. A series of symbols, where each symbol has four to eight possible states, form the carrier. Thus, each symbol conveys two to three binary bits per symbol. Forward error correction systems are used, which add extra bits to form a higher transmission bit rate, to attain an insignificant bit error rate for the information. A pragmatic Trellis type is the inner code together with the 8-PSK. MPEG-2 with DVB Multi-Protocol Encapsulation (DVB-MPE) format for IP data is the data stream format. The extra forward error correction bits, found at the customer receiver, are utilized to perceive errors and basically correct all of them. Another important component in satellite Internet is the Return Channel Satellite Terminals (RCST) outdoor unit (ODU). The following are its components: (1) Parabolic antenna reflector; (2) Feed; (3) Ortho-mode transducer; (4) Filters; and (5) Transmit/receive radio frequency modules. The received downlink from a satellite is normally collected by the reflector. It is better to have a bigger size of the reflector. Most dishes used are of offset front fed parabolic shape with the feed at the bottom on an arm (VSAT, 2005). Appearance of radio signal from the radio equipment until it reaches the air functions in the feed. To allocate power across the dish area is its primary function. It should also be considered that the position of the dish must be at the focus of the parabolic dish shape. Division of the two polarizations positioned at linear and right angles are performed by the Ortho-Mode Transducer (OMT). The function of the two polarities is for the other to transmit and the other to receive. To avoid the transmitter from obstructing the receiver, filters are inserted. It is also used to attach the transmitter and receiver. Up-converting of the signals to transmit frequencies and amplifying them before transmission is the function of transmit module. Powers are directly proportional to transmit bit rates. The higher the power, the greater is the transmit bit rates. If there is RCST-ODU, there is also Return Channel Satellite Terminal (RCST) Linkstar indoor unit, which is an integrated unit that has connections for two coax cables to the antenna and a CAT5 10/100 Base-T connection for an ethernet cable that is linked to the subscriber’s computing equipment. The received MPEG-2 stream is recovered from the outbound signal by an integrated circuit consisting of a DVB-S demodulator and de-multiplexer (VSAT, 2005). The outbound signal is demodulated by this logic. The IP packets that are aimed for precise customer terminal are recovered by the demux, which is then delivered to the external network via the ethernet interface. RCST is responsible in preparing the data into short packets or bursts that are conveyed according to a Time Division Multiple Access (TDMA) system. If you are interested in connecting your personal computer or a local area network, the least complex installation will involve a single computer that is connected with ethernet cable. The basic task is to set the IP address and subnet mask. On the other hand, local area network can be connected through the use of a local router. This will allow many computers on a local area network, cafe, and wireless LAN to be connected. Future Trends in Satellite Internet As we all know, satellite Internet is just a recent innovation for Internet connection. Thus, it still needs to be improved and developed further to allow more people to benefit from this innovation. In the near future, IP protocols are expected to improve at the same time compatible to SAT channel. Voice over IP is also a future trend for satellite internet. Since satellite Internet is costly these days, it is expected to have a lower cost specifically in storage devices in the near future. Traffic over satellites is one of the drawbacks of satellite Internet. However, it is an expected trend in the future to have a more advance hardware and software that will handle and improve traffic over satellites. New networks and traffic management systems is also expected. Innovation in antennas, switching, MMIC, and bandwidth use are expected to get better as satellite internet attracts more market share. Lastly, new satellite systems that use new frequencies such as Ka, V, and Optical systems are also expected to occur in the near future for satellite Internet. Companies Involved in Satellite Internet Teleglobe is one of the largest Internet backbone access providers to Latin America. Recently, it just closed the deal of providing satellite access to content located on Teleglobe’s global Internet backbone network to the University of Costa Rica. It is the leading provider of Internet backbone access services to carriers and ISPs all over Latin America. In addition to its services, it also provides access services for research and education networks throughout the world. Another satellite Internet provider is the Panamsat Corporation. It is included among the world’s top three satellite operators. It manages a global fleet of 30 satellites, which 23 of these satellites are owned by the company. It also supports the largest satellite-based business networks in United States. Its services benefits cable television systems, broadcast affiliates, direct-to-home operators, Internet service providers, and telecommunication companies. One of the global leaders in the market of broadband satellite networks and services is Hughes Network Systems. It provides its services to enterprises, governments, small businesses, and consumers. Globecomm Systems Inc. acquired all the shares of Netsat Express Inc. in June 2001 and decided to combine the services offered by both companies. This acquisition improved Globecomm’s position in the field of satellite-based communications and Internet solutions. Another satellite-based company is the Intelsat. It is the largest provider of fixed satellite services all over the world. These are just some of the companies using satellite for the services that they are offering to the market. Another provider of satellite Internet in Australia and other countries in Asia is Orion Satellite Broadband. Generally, Orion is a provider of wide-ranging telecommunications solutions. However, their primary focus is on developing innovations and approaches to some issues and challenges in communications that cannot be solve by conventional providers. Satellite Internet is one of their services to solve the problem of Internet accessibility. It is also developed and operated by HughesNet in the United States. Another provider of satellite Internet is the partnership of Zaksat and Fantastic Corporation. Zaksat is known as one of the leaders in satellite operator in Middle East countries. Fantastic Corporation is a Swiss-American company that focuses on software technology. The partnership of Zaksat and Fantastic Corporation aims to provide broadband multimedia services among businesses and household consumers in the Middle East, India, Asia, and Australia. In Australia and New Zealand, Netaccess Satellite is the leading provider of satellite Internet. It provides high-speed, business-grade Internet connection even on remote areas of the country. The satellite that they are using for their services, which is their own satellite Optus, covers 100% of countries Australia and New Zealand. The benefits that they are offering their consumers include lightning-fast broadband anywhere in the country, wider coverage of Internet access, ideal Internet access backup, trusted and quality performance, 24-hours customer support, and reporting tools. In countries Iraq, Afghanistan, Iran, Lebanon, Cyprus, Israel, Palestine, Jordan, Egypt, Saudi Arabia, Kuwait, United Arab Emirates, Qatar, Bahrain, Oman, Turkey, Georgia, Azerbaijan, Armenia, Syria, and Turkmenistan iDirect is the leading provider of two-way broadband Internet access. Their services can benefit private consumers, businesses, and institutions. Speed, performance, and flexibility is what they are offering to their services offer the market. There are others that are not mentioned here. These companies are proofs that satellite Internet can benefit and have a large share on the market of Internet providers. Regulatory Issues in Satellite Internet Just like in cable Internet, privacy and speed are the major drawbacks in satellite Internet. Another of its drawback is its susceptibility during bad weather conditions. Redefinition and recasting of 1934 Communications Act is shown in Telecommunications Act of 1996. Its primary goal is to address the emergence of competition in previously monopolistic markets. However, many still believe that the Telecommunications Act of 1996 is not enough to solve and address the issues of the continually changing telecommunications environment. Innovations and changes in the technology of telecommunications include the advancement of Internet in supplying data, voice, and video. Convergence in the telecommunications sector is also a factor that is considered for the need of revision of the act. Some of the issues that concerns broadband communications are as follows: (A) Traditional providers who enter new markets, which they do not hold any power; (B) Extent of existing regulations that should be imposed on new entrants while they compete for traditional providers in the same market; (C) Suitable regulatory framework that will be imposed in new and converging technologies which are not classified in the present framework. Broadband technologies are major considerations in the policy debate. Questions on whether the present regulations are enough to address the issues concerning competition and consumer benefits and satisfaction. Global Implications of Satellite Internet The primary implication of satellite Internet is its geographically advantage over other broadband providers. It solves the problem of Internet accessibility, especially in rural areas where there are no providers of DSL or cable Internet connection. Though innovations and technical advances are continuously arising in today’s world, there are still some who do not have the access to these technologies. Internet is one of the best innovations in today’s century. Though, there are still some who do not have access to it. This is where the function of satellite Internet comes in. It offers an alternative to many consumers. However, its price is generally expensive compared to other broadband providers. Other drawbacks include its delay in delivering of data and its susceptibility on bad weather. As compared to dial-up Internet connectivity, it is by far faster in terms of speed. However, when compared to other broadband technologies such as DSL or cable Internet, it offers just the same speed and other benefits with higher price. As a summary, satellite Internet provides an alternative Internet connection to many geographically challenged areas that do not have connection for DSL or cable Internet. It is not recommended for those who have broadband connections in their area for it has higher price and delay in relaying information especially on bad weather conditions. It diversified the market for consumers in terms of Internet connection.

Quantitative Analysis of Vitamin C in Food Products Essay

There is growing evidence that Vitamin C serves as a potent antioxidant in vitro. There are many functions that Vitamin C has in the body among which is the capacity to improve the immunity system such that a person is more able to fight off colds and flus. Pre-Lab: List five other functions of Vitamin C in the human body. Vitamin C is another name for ascorbic acid. There is a marked similarity between the structure of glucose and Vitamin C. As a matter of fact, plants and most animals are able to synthesize Vitamin C from glucose. Unfortunately, humans are unable to do this and we must include Vitamin C in our diet or we risk a vitamin deficiency disease. We all recognize citrus fruits as a valuable vitamin C source, but few of us realize that many freshly harvested vegetables contain considerably more of this vitamin than do oranges or lime. Unfortunately, storage and processing destroy most of the Vitamin C in vegetables before they reach the consumer. Consumer cooking methods further decrease the amount of vitamin C in vegetables. Vitamin C is water soluble and thus leaches out while cooking or steaming. One useful analytical method for measuring the Vitamin C content of a vegetable or fruit involves an oxidation-reduction titration of ascorbic acid. In the titration, ascorbic acid is oxidized to form dehydroascorbic acid. You might think it unusual to oxidize the acid rather than titrate it with a base. However, biological samples contain many substances that also act as acids (as was mentioned in Experiment 3) and thus interfere in a titration of ascorbic acid with a base. In contrast, many fewer components of biological materials interfere with the oxidation of ascorbic acid by the oxidizing agent 2, 6-dichloroindophenol (DCP). Thus, an oxidation-reduction titration of ascorbic acid with DCP provides a more selective analysis than would an acid-base titration. Please note the equation for the reaction below: C6H8O6 (colorless) + C12H7O2NCl2(red) –> (pH3) C6H6O6 (Colorless) + C12H9O2NCl2 (colorless) This titration is particularly convenient because DCP also serves as its own indicator. As we add DCP solution to a solution containing Vitamin C, the reaction mixture remains colorless until all of the Vitamin C has been converted to dehydroascorbic acid. The next drop of DCP solution added imparts a red color from excess DCP to the mixture, indicating both the equivalence point and the endpoint of the titration. (Expect solution to go from red to colorless —–then at the endpoint red again). Because DCP solutions have a relatively short shelf life, we usually standardize such solutions immediately prior to using them. We can perform the standardization conveniently by titrating aliquots of an ascorbic acid solution prepared from an accurately-weighed sample of reagent-grade ascorbic acid. The standardization titration reaction is the same as the analysis reaction above. In this experiment, you will begin by standardizing a DCP solution. Then you will determine the vitamin C content of liquid and solid food samples by titration with the standardized DCP solution. Prior to performing the titrations, you will treat the food samples with metaphosphoric acid. Treatment with this acid serves to denature and precipitate proteins that would otherwise interfere with the analysis. Acidification of thesample also serves to stabilize the ascorbic acid, which will otherwise decompose and be undetectable. Acidification to pH less than 4 also minimizes reaction of DCP with other compounds which react with DCP only at pH levels greater than 4.