Year 12 Physics 2014 ER – The Physics of Medicine Extended Response Task [Type the author name] This report will discuss how cerebrovascular disease‚ in particular ischemic stroke‚ can be diagnosed using magnetic resonance imaging scans. It will go through the different MRI sequences and the physics behind them. Evidence from two case studies are presented‚ which use the MRI sequences discussed within this report. Consequently‚ the recent advances in diagnostic techniques and methodologies will
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An ion is an atom or molecule in which the total number of electrons is not equal to the total number of protons‚ giving it a net positive or negative electrical charge. The name was given by physicist Michael Faraday for the substances that allow a current to pass ("go") between electrodes in a solution‚ when an electric field is applied. It is from Greek ιον‚ meaning "going." The word ion also is responsible for electrical current being symbolized by the letter i in chemistry and physics. An anion
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theory of spectra and atomic constitution‚ atomic theory and the description of nature. NEILS BOHR (1885-1962) His model of atom…. Bohar’s model of atom can be described as follows: An atom is made up of three particles-electrons‚ protons and neutrons. The protons and neutrons are located in a small nucleus at the centre of the atom. The electrons revolve rapidly round the nucleus in fixed circular paths called energy levels or shells. There is a limit to the number of electrons which each
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A cycle is a biological pathway or process in which the end product of one cycle becomes the starting point for the next cycles Write an essay about cycles. Respiration Cells in the body use ATP as a direct source of energy. The conversion of glucose into ATP takes place during respiration. There are 2 different types of respiration‚ the more common and frequent one is aerobic respiration which is the production of ATP for energy. The less common one is anaerobic respiration‚ the production
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but for easier reasons you can call me P. I am pretty much at the beginning of the periodic table‚ thanks to my atomic number of 15. Wonder what’s an atomic number? It is basically the number of protons‚ which is my positive charge‚ that I contain at my nucleus. The nucleus does not only contain protons‚ but also neutrons‚ which will be important to know of and will talk about it soon. I was discovered in 1669 by my closest human friend‚ Henning Brand. He is such a wonderful human
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acids – sour‚ turn blue litmus to red (pink)‚ conduct electricity - bases – bitter‚ soapy taste‚ slippery‚ conduct electricity‚ turn red litmus to blue Bronsted – Lowry Theory: - acids – donate proton‚ bases accept proton - ex: HCl donates proton to water ( not reversible ) - ex: water donates proton to ammonia – reversible - Amphoteric substances: ____________________________________________________________ - Advantage of B-L definition: - 1. reactions can be identified as acid-base neutralization
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IIn part A‚ the unknown 30 was identified as Histidine by using a thin layer chromatography. Among the four amino acid standards (Ala‚ Gly‚ His‚ and Ser)‚ the average Rf value of the unknown (0.31) was closest to that of standard Histidine (0.29) and its Rf percent error was lowest (6.9%). Furthermore‚ the color‚ shape‚ and size of the unknown clearly corresponded to that of Histidine standard. Overall‚ the experiment was successful in identifying the unknown amino acid‚ for the obtained Rf and
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IB Home Standard Level Higher Level Options Additional Resources 8.2 Photosynthesis 8.2.1 Draw and label a diagram showing the structure of a chloroplast as seen in an electron micrograph 2D Representation 3D Representation Electron Micrograph 8.2.2 State that photosynthesis consists of the light-dependent and light-independent reactions Photosynthesis is a two-step process: 1. The light dependent reactions convert the light energy into chemical energy 2. The light
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adioisotopes: What Are They and How Are They Made?What are isotopes?The isotopes of an element are all the atoms that have in their nucleus the number of protons (atomic number) corresponding to the chemical behavior of that element. However‚ the isotopes of a single element vary in the number of neutrons in their nuclei. Since they still have the same number of protons‚ all these isotopes of an element have identical chemical behavior. But since they have different numbers of neutrons‚ these isotopes of the
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bases in existence‚ but the most useful one is the Bronsted-Lowry definition: An acid is a substance which can behave as a proton (re presented as a hydrogen ion‚ H+) donor. Any substance which contains hydrogen bonded to a more electronegative element can thus behave as an acid: HCl == H+ + Cl- H2SO4 == H+ + HSO4- A base is a substance which can behave as a proton acceptor. Any species which has a lone pair of electrons can thus behave as a base: NH3 + H+ == NH4+ OH- + H+ == H2O 2
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