Activity 1: Simple diffusion Introduction: Simple diffusion is the net movement of substances from a region of high concentration to a region of low concentration so its overall net movement is along the concentration gradient‚ simple diffusion does not require energy therefore it is ’passive’‚ substances are diffused across the membrane between the phospholipids. Materials and methods: * 20 mwco dialysis membrane * 50 mwco dialysis membrane * 100 mwco dialysis membrane * 200 mwco
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Inventing a better future A strategy for building worldwidecapacities in science and technology January 2004 InterAcademy Council InterAcademy Council IAC projects are funded individually by multiple sponsors‚ including interested foundations and international organizations. Administrative overhead is covered by special grants from the Netherlands government and the Royal Netherlands Academy of Arts and Sciences. Participating academies not only contribute time and ideas‚ but also funding for
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Simple Diffusion Activity 1: Simulating Simple diffusion 1.What is the molecular weight of Na+? 22.9 2. What is the molecular weight of Cl-? 35.45 3. Which MWCO dialysis membranes allowed both of these ions through? 50‚ 100‚ and 200 4. Which materials diffused from the left beaker to the right beaker? Urea‚ NaCl and glucose diffused 5. Which did not? Why? Albumin‚ because the molecular weight exceeded the highest MWCO membrane‚ thus being to large to pass through
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Biology Lab #1: Chemical Diffusion Purpose To discover how the size of a cell affects the diffusion of chemicals throughout the cell. Hypothesis I predict that as the cell size increases the diffusion depth and the diffusion rate will decrease. Equipment • Eye protection • 250 mL beaker • Timing device • Scoopula • Ruler • Scalpel • Sodium hydroxide solution • 3 different sized cubes of phenolphthalein agar • Paper towels Purpose
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(Leviathan) maintained that for social control to exist‚ there must be strong government to ensure moral and social harmony. Niccolo Machiavelli (The Prince) however‚ contended that social benefits for social stability and security can be achieved in the face of moral corruption." In about 2000 words‚ write an essay based on research found in the two books above that talks about the role of government as a socializing agent and the role of morality in effective social control. The basis of both Leviathan
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Lab # 2 Diffusion & Osmosis Introduction Kinetic energy‚ a root of energy stored in cells‚ causes molecules to hit into each other and move in new directions. Diffusion is the result of this contact. Diffusion is the random movement of molecules to an area of lower concentration from an area of higher concentration. Osmosis is a type of diffusion. This is the diffusion of water through a selectively permeable membrane from a region of higher water potential to a region of lower water
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The purpose of this lab was to observe the rate of osmosis and diffusion‚ as well as the effect of molecular size of the particles on this rate. Part I of the lab was a demonstration of osmosis and diffusion‚ that dealt with raisins in different liquid environments‚ each with a different concentration of sugar. Part IV of the lab was using the same idea as the demonstration‚ by putting objects in different concentrations of a substance; in this case elodea leaves in salt water. In both cases‚ the
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Level 3 Public Services Government‚ Politics and the Public Services Unit 1 European parliament What is the European Parliament? The European Parliament‚ also abbreviated as Europarl or the EP‚ is the directly elected parliamentary institution of the European Union (EU). Together with the Council of the European Union and the European Commission‚ it exercises the legislative function of the EU and it has been described as one of the most powerful legislatures in the world The European Directly
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Government propaganda played a major role in World War II by promoting national identity and unity. T World War II gave us countless examples of wartime propaganda posters that engaged Propaganda posters‚ fabricated by both Allied and Axis nations‚ persuaded their populaces of the justness of their cause. These posters today can be found in museums and online‚ allowing us all to study different methods of national advertising in times of war. The War Production Board was established in 1942 to direct
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The effect of size on the effectiveness of diffusion Aim: To use agar blocks infused with 0.1 Molar sodium hydroxide (NaOH) and phenolphthalein to investigate the relationship between shape and surface area: volume ratio on the effectiveness of diffusion. Hypothesis: That for a cube of agar‚ the time taken for complete colourisation due to diffusion of HCl is directly proportional to the cubes volume. Materials: |A block of agar (10cm x 5cm x 3cm) with 0.1M NaOH and |1x 250mL
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