Size Exclusion Chromatography Size Exclusion Chromatography (SEC) is the separation technique based on the molecular size of the components. Size exclusion chromatography is a kind of method to separate different size of molecules that put in solution. It was first discovered by two scientists who named Grant Henry Lathe and Colin R Ruthven. Both of them received the John Scott Award for this fabulous invention. There are various applications for Size exclusion chromatography such as biochemical
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Sample size The process of determining the proper sample size was established through a series of calculations and after obtaining all the possible sample sizes‚ the largest one was taken into consideration to collect the closest number to a representative sample of the population. The following two equations where used: Equation 1: N=z2 *(p.q) E2 N= sample size Z=level of confidence interval at 95% so z=1.96 P=estimated percent of population E=acceptable sample error expressed
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Air Bag An airbag is a vehicle safety device. It is an occupant restraint consisting of a flexible envelope designed to inflate rapidly during an automobilecollision‚ to prevent occupants from striking interior objects such as the steering wheel or a window. Modern vehicles may contain multiple airbags in various side and frontal locations of the passenger seating positions‚ and sensors may deploy one or more airbags in an impact zone at variable rates based on the type and severity of
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Size reduction and screening The purpose of this experiment was to determine the affect of vibration rate and time on the size reduction and size separation of particles. The objective was successfully completed and the initial sample of soil was separated by vibration into finer particles with a large amount passing through the smallest diameter screen which was 0.0278 inches producing a final product of fine soil particles which are now easier to transport and store. As can be seen from the
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Cell Size Control David A Guertin‚ Whitehead Institute for Biomedical Research‚ Cambridge‚ Massachusetts‚ USA David M Sabatini‚ Whitehead Institute for Biomedical Research‚ Cambridge‚ Massachusetts‚ USA Growth in biological systems is defined as the accumulation of mass‚ which leads to an increase in size. In this article‚ we discuss how cells‚ organs‚ and organisms normally control growth‚ and how deregulated growth can lead to a variety of pathological conditions. Introductory article Article
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Super Size Me and Society 15 January 2010 There has been a lot of stir in the media lately regarding McDonalds and its role in obese children in society. So much so that restrictions and regulations have been proposed and passed in California to ban toys from unhealthy meals that appeal to kids. When I first heard about this I thought it was pretty ridiculous. Americans should be free to do what we please. My opinion has changed since watching Super Size Me. I didn’t watch Super Size Me when
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Cheung Sha Wan Road Kowloon 3 December 2010 The Administrative officer Environmental Protection Department 33/F-34/F Revenue Tower 5 Gloucester Road Wan Chai Dear Sir/Madam‚ I am writing to inform you of my dissatisfactory with the poor air quality long existing in Hong Kong. Fuelled by the pollutants from power plants and vehicles‚ and made worse by the regional pollution‚ Hong Kong in most of the days seems wrapped in a grey shroud to a point that‚ you cannot make out from the Central
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EARTH The earth is 4.5 billion years old. The Big Bang theory says that there was an explosion caused by the crash of matter which created our Solar System. Millions of years ago‚ during the Paleozoic era‚ the seven continents formed one single super-continent‚ from which they later detached driven by endogenous forces. Mankind appeared on Earth 30000 years ago. According to Darwin organisms which adapt the best to the environment they live in‚ survive the longest. Mankind become the dominant
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HVAC Systems: Air Conditioning Dr. Harjit Singh Room 116 Howell Building harjit.singh@brunel.ac.uk Fridays 09.30 – 11.30am Unless otherwise specified For students enquiries: 1 Building Services Engineering: Building Air Conditioning Module (ME5508)‚ Brunel University Introduction to the module • Credit: 15 • Teaching materials: – Provided for the MSc students. – Undergrads: Buy them from the stores. • Assignment: to be handed two weeks before Xmas‚ deadline-28 Jan 2013 • Students
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Into Thin Air takes place in the area around and on Mount Everest in the year 1996. This is significant because at that altitude‚ the oxygen level isn’t as high as it would be at sea level. With their brains not receiving enough oxygen‚ the climbers were not able to think at their full mental capacity. Therefore many simple mistakes were made that should not have been. High altitude cerebral edema and high altitude pulmonary edema caused problems with some of the climbers and Sherpas. Beck Weather’s
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