the membrane potential depends on the external potassium‚ [K+]o and external sodium‚ [Na+]o concentrations and the relative permeability of the membrane to these ions. The program simulates membrane potential measurements in any excitable cell permeable to K+ and Na+ ions (e.g.‚ nerve or muscle). The Mempot shortcut is located in the Physiology folder on the desktop. EXERCISE 1 – RESTING POTENTIAL MEASUREMENTS 1. From the menu‚ open the “Resting Potential Experiment”. This exercise illustrates
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The cell membrane is made up of fats‚ proteins‚ lipids‚ and carbohydrates‚ and is a permeable structure. However‚ this permeation is very discerning because it only lets certain things pass through it. The cell membrane has a layer of phospholipids with hydrophobic ends and hydrophilic tops. The “tails” are made out of phosphate‚ while the “heads” are made up of two strings of fatty acids. There are two layers of these phospholipids‚ called the “bilayer”‚ and the tips of each phospholipid are facing
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because they affect the surface area of the piece‚ and varying surface area could have a great effect on the rate of osmosis. This is because in an experiment where the potato chip has a large surface area‚ there is a larger area of partially permeable membrane and therefore more opportunity for water particles to pass through. I will keep the surface area the same by keeping the mass and length of the potato piece the same in each instance‚ by measuring and cutting it carefully. I am
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concentrations Dependant Variable: Mean percentage change in mass of potato cells All cells have a protective barrier‚ one which selectively allows substances to enter and exit the cell. This is known as a cell membrane. Some cells are semi-permeable‚ which means it only allows certain substances to enter and exit the cells. Osmosis is a process by which molecules of a solvent
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Louis Pasteur And The Alcoholic Fermentation Abstract: Louis Pasteur (1822-1895) was a French chemist and microbiologist known for his discoveries in the field of vaccination‚ pasteurization and microbial fermentation. His discoveries have saved many lives and his contributions to science‚ technology‚ and medicine are nearly without precedent. This paper will focus on one of the aspect of his work that relates mostly to chemistry: the alcoholic fermentation. Louis Pasteur:
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Biosensors *Kahini Vaid *Siddharth Shukla *Students of Biomedical Engineering (LDCE) Abstract This report gives an overview about biosensors‚ their types‚ their construction‚ development and its future needs. A biosensor is an analytical device for the detection of an analyte that combines a biological component with a physicochemical detector component. I. INTRODUCTION This report is a small presentation about biosensors and its types. A biosensor is an analytical
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Human Cell‚ protein production‚ cell organelles and the cell membrane. Structure and cell transport. The cell is the basic structural and functional unit of all known living organisms (See figure 1). It is the smallest unit of life that is classified as a living thing (except virus‚ which consists only from DNA/RNA covered by protein and lipids)‚ and is often called the building block of life. Organisms can be classified as unicellular (consisting of a single cell; including most bacteria) or
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Title: Colligative Properties & Osmotic Pressure Background: Important terms to study from this lab assignment are colligative properties‚ membrane permeability and osmotic pressure. First‚ colligative properties are “those of a solution that depend solely on the number of solute particles present‚ not the identity of those solute particles. These properties include: vapor pressure lowering‚ boiling point elevation‚ freezing point depression‚ and osmotic pressure” (p. 17 lab manual). In this experiment
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as the camel. Feedback loops maintain the internal environment in an acceptable state‚ or homeostasis. Factors that generate opposite effects on a pathway are termed antagonistic controls. Two compartments are separated by a membrane that is permeable to water and urea. Compartment I contains 1 M NaCl. Compartment II contains 2 M urea. Which of the following is a correct statement of their relationship based on the initial conditions? Compartment I is hypertonic to Compartment II. Compartment
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Seminar 4 I Ex. 4‚ p. 57 Discuss different types of stylistic devices dealing with the completeness of the sentence 1. In manner‚ close and dry. In voice‚ husky and low. In face‚ watchful behind a blind. (D.) Перевод Манеры у него сдержанные и сухие. Голос глухой и хриплый. Лицо внимательное‚ как бы прикрытое занавесом. Анализ With the ellipsis the author comments on the character’s manners preceding the speech. ‘He is/was’ is most obviously omitted. 2. Malay Camp. A row of streets crossing another
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