MGH Evoked Potential Normative Values Pattern Shift Visual Evoked Potentials P 100 Latency (msec) Inter-eye difference (msec) P 100 Amplitude (µV) P 100 Amplitude % difference Mean 102.3 1.3 10.1 85.5% SD 5.1 2 4.2 10.50% Mean + 3 SD 117.6 7.3 N/A Notes (Smallest/Largest) 53.9% X 100 Brainstem Auditory Evoked Potentials Latencies (msec) I II III IV V VI Inter-wave latencies (msec) I-III I-V III-IV III-V IV-V V-VI Mean 1.7 2.8 3.9 5.1 5.7 7.3 SD 0.15 0.17 0.19 0.24
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examples of work done=force x distance What is work? Work in physics is the transfer of energy; work is done on an object when an applied force moves it through a distance. The link between work and energy is work done equals energy transferred. The units for the two are also the same (joules). E.g. 500J of work = 500J of kinetic energy. Work is calculated with the formula: work done=force x distance moved For example‚ if a force of 10 newton (F = 10 N) acts along point that travels 2 meters
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Title: Potato Osmosis Abstract: In this experiment was designed to study the effect of a concentrated solution applied to white and sweet potatoes. The solution’s impact among the potatoes were to be either hypertonic‚ hypotonic‚ or isotonic. The potatoes were first cut into fries with a fry cutter‚ and then weighed after being cut. The white and sweet potatoes’ weights ranged from .005-.015 grams. A total of 18 sugar solutions are to be made over the course of 3 trials. In each trial‚ 6 different
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concentration (mole/dm3 (M)) of solute in a potato cell by using the process of osmosis and different concentrations of sucrose solution. Background information Osmosis is diffusion of water across a partially permeable membrane. It moves from a solution with less solute concentration (high water potential) to a solution with more solute concentration (low water potential). The one with a high water concentration is called a hypotonic solution and the low water concentration is called hypertonic solution
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Distilled Water 0.8 1.0 125% 0.4% NaCl 0.5 0.8 160% 0.9% NaCl 0.6 0.8 133% 5% NaCl 0.6 0.5 83% 10% NaCl 0.6 0.5 83% 8. The cells in the solutions of distilled water‚ 0.4% NaCl‚ and 0.9% NaCl would all appear to be inflated and could burst. This is due to the fact that the solution is hypotonic to the potato‚ thus water is entering the cell. Meanwhile‚ the cells in the solutions 5% NaCl and 10% NaCl would have shriveled cells. This is because the solution is hypertonic and water is leaving
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Observing Osmosis in Potato Cells Planning Purpose: To observe the effect of osmosis on plant cells. Hypothesis: The higher the salt content of the water‚ the lower the mass of the potato. Variables: Independent: the salt percentage of the solution Dependent: the weight of the potato in grams Controlled: the amount of water the length of time between measurements the method of measuring the type of plant cells tested Equipment: (as seen on 2A Human Biology task sheet)
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B. Yeats‚ 1921 TEACHER ’S INTRODUCTION Between 1845 and 1850‚ more than a million Irish people starved to death while massive quantities of food were being exported from their country. A half million were evicted from their homes during the potato blight‚ and a million and a half emigrated to America‚ Britain and Australia‚ often on-board rotting‚ overcrowded "coffin ships". This is the story of how that immense tragedy came to pass. The necessary historical and political context for a
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Experiment: Turgor in Potato Tissue 1. We labelled three test tubes A‚ B‚ C‚ D and added initials of people in our group. 2. Used a syringe or graduated pipette to put 20 cm3water in tube A and 10 cm3 in tube B. 3. Put 20 cm3 of 17% solution in tube C and 10 cm3 in tube B; put 20 cm3 pure sucrose solutions in tube D. 4. Working on the dissecting board I cut the ends off large potato. I was careful with the knife and cut it onto the dissecting board away from myself. 5. Used a cork
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promote society’s values. Important social skills needed in the work force and everyday life are learned at school‚ such as sharing‚ compromise‚ and the importance of teamwork. As a student‚ I want to encourage and help children to reach their full potential. I want students to realize that they are all different‚ and understand that diversity is a good thing. I believe that there are different types of intelligence‚ and creativity is just as important as logic. Teachers’ behavior should reflect values
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Membrane Structure Activity: Diffusion Activity: Osmosis and Water Balance in Cells Bioflix: Membrane Transport Additional Resources Blast Animation: Diffusion Blast Animation: Passive Diffusion Across a Membrane TLM / Handouts: View the PowerPoint presentation titled ‘Identifying Variables’. Print out the Osmosis Lab Student Worksheet on pages 4-7 of this document and complete it as instructed throughout the lab. Introduction: Water‚ the major component of cytoplasm and extra-cellular fluids
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