experiment was to observe the process of diffusion of substances across a semipermeable membrane to gain a better understanding of how cells move materials across cell membranes. The experiment was designed to exhibit Brownian Motion; the random movement and tendency of particles of a substance to move from an area of greater concentration to lower concentration via diffusion until equilibrium has been attained. In addition to observing the passive process of diffusion‚ the experiment demonstrated how a
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Lab Activity No. __ Diffusion and Osmosis I. Introduction Diffusion is the transfer of molecules (or ions) from an area of higher concentration to a lower concentration‚ while osmosis is the transfer of water from a higher concentration to a lower concentration. II. Objectives 1. Demonstrate diffusion and osmosis across membrane. 2. Examine the relation of membrane permeability to diffusion and osmosis. III. Materials 2 thistle tubes‚ 2 big beakers‚ 4 tube clamps to fit iron stands
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basic facts. We define diffusion as movement of materials from a region of higher concentration to a region of lower concentration. This movement is due to kinetic energy of particles. An example of this can be observed by opening a bottle of perfume. Soon you will smell the perfume in distant parts of the room. It diffuses from the high concentration of molecules in the bottle to a lower concentration of molecules in the air. Osmosis is a type of diffusion. It involves movement of
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test antimicrobial activity against disease causing bacteria Staphylococcuaureus. Extracts of varying concentrations of Azadirachtaindica fruit pulp and leaf extract were prepared using Phosphate Buffer and tested against test organisms using agar diffusion method. Oxfloxacinof same varying concentrations were used to compare the effect of antimicrobial activity of fruit pulp and leaf extract. Keywords: Azadirachtaindica‚ Antimicrobial activity‚ Staphylococcus aureus. I. INTRODUCTION Azadirachtaindica
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in determining what they eat. 3.) What is the significance of a membranes being selectively permeable? It allows the cells to control its internal environment. Check and Challenge p 85 1. What is a concentration gradient? How does it affect diffusion? Concentration gradient is a difference in the concentration of molecules across a membrane or a distance. Diffision is a basic process that allows molecules to movr into and out of the cell‚ which is possible with the concentration gradient.
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Aim: To observe and describe an example of osmosis. Hypothesis: I predict that the water level will rise as the iodine stained water moves through the cellulose bag due to osmosis. The iodine is there so we can see this happening. Materials: * Dialysis(cellulose) tubing * Thistle funnel * Gas jar * Retort clamp and stand * Rubber bands * 50mL beaker * Iodine/potassium iodine solution * 5% starch solution Method: 1) Fill the gas jar to 3 quarters full with
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Bibliography: Diffusion and osmosis. (n.d.). Retrieved from http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/diffus.html McGraw-Hill. (2006). How osmosis works. Retrieved from http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works
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Egg Lab Write Up The purpose of this lab was to depicked the many properties of diffusion such as isotonic‚ hypotnonic‚ and hypertonic‚ so that students could have a clear visual example to go by for future refrences. We also did this to learn about selective permeability and osmosis. Our original hypothesis stated that the vinegar would react with the calcium in the shell to create CO2 bubbles. Note I said the original hypothesis as this experiment took coarse over a four day period‚ in which
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Experimental Laboratory Report: An investigation into the rate of osmosis Liana Gohery - 98332250 12/12/2014 Word count - ………3000……….. 1. Abstract This study was conducted to investigate the effect of concentration gradients on the rate of osmosis. Osmosis is the cellular transport of water‚ this study was conducted to show the significance of the rate at which this occurs. Dialysis bags were filled with three different concentrations of sucrose solutions and two with water. They were
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Abstract - The experiments done in class served for multiple purposes. It helped identify that diffusion is the shifting of molecules from one part to another that takes no energy‚ and that osmosis is just the flow of water through the cell membrane. The main purpose of the first experiment was to examine the movement of H2O and other materials in living and simulate systems. This was done through the dialysis tubing to mimic the cell membrane and measure the change of mass inside the tube filled
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