Selective attention is very important in our daily lives‚ but we are often unaware of how it really works. Therefore‚ it is worthy to explore its characteristics and functions‚ ways to control it and investigation methods. Selective attention‚ also known as focused attention‚ mainly controls our awareness of particular categories or entities in our environment. When it is involved‚ we focus entirely on one stimulus and ignore others (Elizabeth‚ 2006). For instance‚ when we are working hard on an
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A summary of Diffusion of Innovations Les Robinson Fully revised and rewritten Jan 2009 Diffusion of Innovations seeks to explain how innovations are taken up in a population. An innovation is an idea‚ behaviour‚ or object that is perceived as new by its audience. Diffusion of Innovations offers three valuable insights into the process of social change: - What qualities make an innovation spread successfully. - The importance of peer-peer conversations and peer networks.
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"Diffusion - How atoms move through solids" Diffusion means mass transport by atomic motion. The mechanisms of Gases & Liquids is known as random (Brownian) motion and for solids is known vacancy diffusion or interstitial diffusion. Simply we can define diffusion as‚ the movement of particles in a solid from an area of high concentration to an area of low concentration‚ resulting in the uniform distribution of the substance. (Diffusion chapter 5‚ 2008‚ p.1) Ronald D. Kriz(1999) suggests that
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Topic 2 – Cell membranes Reading Chapter 5 Objectives Functions of cell membranes The fluid mosaic model The lipid bilayer – phospholipids‚ glycolipids and sterols Properties of the lipid bilayer Membrane proteins – the ‘mosaic’ in the model Solute movements across membranes BIO 1140 – SLIDE 1 http://www.nikonsmallworld.com/gallery/year/2006/id/751 Functions of cell membranes – an overview Fluid mosaic model Singer & Nicolson 1972 Fluid lipid molecules in which
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Diffusion and Osmosis in an egg Low concentration 1.1 Diffusion is the process of molecules spreading from areas of high concentration to areas of low concentration. High concentration 1.1 Osmosis is the diffusion of water molecules through a semi-permeable membrane from the area of low concentration of solute to the area of high concentration of solute. 1.2 Diffusion is important to living cells because it’s the way they take in materials from the environment‚ and they also prevent themselves
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Biological Membranes Lipid Membranes • Receptors‚ detecting the signals from outside: Light Odorant Taste Chemicals A Hormones Neurotransmitters Drugs • Channels‚ gates and pumps • Electric/chemical potential Neurophysiology Energy • Energy transduction: Photosynthesis Oxidative phosphorylation • • • • • • Structure Function Composition Physicochemical properties Self-assembly Molecular models highly selective permeability barrier Internal membranes for organelles Bilayer Permeability
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passed on to the next generation‚ selective breeding was introduced. Selective breeding is the process by which organisms (plants‚ animals) with a desired trait are chosen and breed to produce offspring with the desired trait due to human intervention. Selective breeding is popular in areas of agriculture as it produces results much faster than natural selection. The breeder will attempt to isolate and propagate the genotype of the desired trait. [1] Selective breeding can be seen as a way of breeding
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Membrane Transport Process Process Energy Source Description Examples Passive processes Simple diffusion Kinetic energy Kinetic energy Net movement of particles (ions. molecules. etc.) from an area of their higher concentration to an area of their lower concentration. that is. along their concentration gradient Movement of fats‚ oxygen‚ carbon dioxide through the lipid portion of the membrane‚ and ions through protein channels under certain conditions Osmosis Kinetic energy Simple diffusion
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for the movement of substances across the plasma membrane‚ and to indicate the driving force for each. This may also be applied to the study of transport mechanisms in living membrane-bounded cells. Also‚ understanding of which way substances will move passively through a deferentially permeable membrane depending on the concentration differences. We used PhysioEx software to examine diffusion. In these experiments we used different sized membranes as well as NaCl‚ urea‚ glucose‚ albumin‚ powdered
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Selective Mutism Selective Mutism is the name given to a mental disorder found mostly in children‚ which is characterized by the child ’s failure to speak in certain situations and settings for greater than one month. These children have the ability to speak and understand spoken language‚ yet they are unable to speak in many social settings. Most speak at home or to certain individuals in the home‚ but are unable to speak in school. Most do‚ however‚ function normally in other ways and learn
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