early atmosphere - earth roughly 4 billion yrs old - created by volcanoes erupting + releasing gases - contained mostly co2 + water vapour - earth cooled + water vapour condensed to form oceans - co2 dissolved into oceans + used to form marine organism shells which were compacted to form sedimentary rock - plants evolved to photosynthesise‚ takingin co2 + releasing oxygen - scientists don’t kno where all nitrogen came from bc they weren’t there to record evidence but most theories suggest
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www.igcse.at.ua ORGANIC CHEMISTRY OIL and its many useful PRODUCTS The origin of oil Crude oil is formed from organic material of the remains of plant and animal organisms that lived millions of years ago. These remains form sediments eg at the bottom of seas‚ and become buried under layers of sedimentary rock. They decay‚ without air (oxygen)‚ under the action of heat and pressure to form crude oil over millions of years. It is a fossil fuel because it is formed from
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maltose = α-glucose + α-glucose sucrose = glucose + fructose lactose = glucose + galactose germinating seeds phloem tissue‚ fruit milk β-glucose fructose O maltose starch glycogen cellulose chitin = = = = polymer of glucose polymer of α-glucose polymer of β-glucose polymer of glucosamine (glucose with an amino acid attached) chloroplast stroma muscle cells plant cell wall exoskelteton of arthropods O O O O cellulose Monosaccharides and Disaccharides Monosaccharides and disaccharides
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Balloon Angioplasty Introduction: Angioplasty is a technique that broadens a narrow or congested blood vessel using a inflatable catheter. It is used to treat atherosclerosis (blood vessel impediments)‚ and regularly made by an interventional cardiologist‚ a medical doctor with distinctive training in the handling of the heart‚ using invasive catheter-based measures. Angioplasty is frequently achieved as a minimally-invasive technique‚ where a stent is implanted into the blood vessel to preserve
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Contents 1. What is OLED? 2. History of OLED 3. Construction 4. Working Principle 5. Meterial Technologies 6. Device Architectures 7. Advantages 8. Disadvantages 9. Manufacturers and commercial uses 10. References What is OLED Led: A light-emitting diode (LED) is a semiconductor light source. When a light-emitting diode is forward biased (switched on)‚ electrons are able to recombine with electron holes within the device‚ releasing energy in the form of photons. This effect is called electroluminescence and
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the vendor invest equally in an ordering system upgrade that will benefit both organizations by increasing the order and delivery systems efficiency. The new ordering system will link both organizations in order to communicate demand for plastic polymers instantaneously when an order is inputted
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coming from mineral sources‚ but this fibre is banned in many countries from being used due to health hazards) whereas the production of man-made fibres is an important activity of the world-wide chemical industry involving largely natural polymers and synthetic polymers (derieved from petrochemical by-products). There are also a limited number of man-made fibres such as glass‚ metal and ceramics are produced using inorganic materials. Although natural fibres are extensively used in the technical textile
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(2012). Effect of Storage Period and Packaging on the Shelf Life of Cereal Bran Incorporated Biscuits. American Journal of Food Technology‚ 7: 301-310. Valentina. S. (2012). Food Packaging Permeability Behaviour: A Report‚ International Journal of Polymer Science‚ Volume 2012‚ 1- 11.
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fiber’s development was very similar to their prior development of the Nomex fiber. Nomex was at the time‚ the most expensive new product DuPont had developed. Initially identified as a large impact polymer fiber‚ its initial sales were slow and before Nomex could develop into a financially sound polymer‚ it was plagued with expensive operating problems and technological issues before it was broadly accepted by the market. The lesson DuPont executives took from this was that an industrial product
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Study guide Exam 1 Ch 1-5 CH 1 Overview‚ what is evolution‚ what is biology‚ what is life Evolution scientific explanation for: the unity and diversity we see in various organisms the suitability of organisms to their environments is evolution Hierarchy – molecules‚ cells‚ tissue‚ organ‚ organisms‚ populations‚ communities‚ ecosystem‚ biosphere Emergent properties – zooming from molecular level out to see function Reductionism (complex to simple) and Systems Biology (dynamic) Organisms
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