when she was 41. She earned a Science degree in Chemistry in 1946. She began work at DuPort research Laboratory where she conducted low-temperature experiments for preparation of polymers for the creation of highly rigid and strong petroleum-based fibres. Kwolek made a solution that caused unstable intermediates from these experiments to bond into long chains. Under these conditions‚ the polymers formed a cloudy fluid in contrast to the clear and sticky
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CORE PRACTICAL ONE Describe how the effect of caffeine on heart rate in Daphnia can be investigated practically‚ and discuss whether there are ethical issues in the use of invertebrates. Daphnia‚ the water flea‚ is a small freshwater crustacean which lacks physiological methods of maintaining a constant body temperature. This means that if the environmental temperature changes‚ its body temperature does so too and its metabolic rate will be expected to rise or fall accordingly. So the temperature
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9.1 Manufacture of Sulphuric Acid 1. State uses of sulphuric acid in daily life. - lead acid batteries in automobiles and for home use - extraction of elements from ores - manufacturing of fertilizers 2.The following shows an incomplete flow chart of the Contact process. a) b)Chemical equation A. B. C. D. 3. Briefly explain the sources of sulphuric dioxide gas in atmosphere. -Sulphur dioxide is produced mainly from the combustion of fossil fuels
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training sessions and it helps the body to get ready for tomorrow’s swimming carnival. Pastas have more fibre and‚ usually‚ less added sugar than other food. As it is the night before the big competition‚ simpler stuff—plain pasta with simpler red sauce would be a great choice. Occasionally‚ fibre takes a while to get through the body system and it can contribute to gastrointestinal distress‚ so fibre other than the pasta should be reduced before a big athletic event and can help things run more smoothly
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Howards End by E. M. Forster deals with the conflict of class distinctions and human relationships. The quintessence of the main theme of this lovely novel is: "Only connect! Only connect the prose and passion and human love will be seen at its height. Live in fragments no longer." This excerpt represents the main idea that Forster carries through the book: relationships‚ not social status‚ are--or at least should be--the most important thing for people.<br><br>Howards End was written in 1910. That
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Activity of Gastrointestinal Smooth Muscle: Worksheet Please Ensure That You Have Completed The Calculations In Tables 1-3 Before You Answer The Worksheet Questions Table 1. The effects of phentolamine and atropine on the contractile response to nerve stimulation (20 Hz) in the isolated rabbit ileum | |Contraction amplitude |Contraction amplitude with the |Effect of nerve stimulation on the contraction amplitude | | |pre-nerve
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Equipment cost is very high because data transfer is in the form of fibres which has to be laid throughout the area. It needs long kilometres of cables. So‚ cost for investing is very high. 2. Increased sharing of information leads to the privacy issue. 3. Mandatory reporting is done only via online on NBN which has a small security issue in misguiding data. 4. Internet Cost is very high on monthly basis because of use of optical fibre. 5. Consumption of electricity is bit higher when compared to
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They are widely used for pipes‚ containers and packaging. Nonetheless‚ Polyethylene is a polymer made of ethylene. Ethylene has two carbon atoms bonded to each other with a double bond. Polyethylene is the basic component in making bottles‚ bags and fibres. Both polypropylene and polyethylene are thermoplastics polymers. They are linear polymers at which the chains aligned properly giving a range of molecular weights and arrangement of molecules pack together in variety of configurations. (Michael &
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ENERGY SYSTEMS Figure 1 shows a sprint cycle race. This activity involves cycling four laps of a 250 metre track‚ with the final lap being completed as fast as possible. Elite performers cover the final lap in times of between 10 and 11 seconds. (a) Name the main energy system being used in the final sprint to the finishing line and explain how this system provides energy for the working muscles. (4 marks) (b) At the end of the race‚ the cyclist will be out of breath and will continue to breathe
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assigned. Your group will then present back the findings to the rest of the group through a detailed and informative A3 poster. • Musculoskeletal response: increased blood supply; increase in muscle pliability; increased range of movement; muscle fibre micro tears • Energy systems: phosphocreatine; lactic acid; aerobic; energy continuum; energy requirements of different sport and exercise activities • Cardiovascular response: heart rate anticipatory response; activity response; increased blood pressure;
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