experiment‚ we worked with potatoes‚ also known as solanum tuberosum (Watkins‚ n.d). Potatoes are starchy crops that provide a lot of energy. For this experiment‚ our hypothesis was: If the pH level of the solution is more basic‚ then the potato membrane will weigh less due to osmosis. Our null hypothesis was: If the pH level of a solution is either acidic or basic‚ then it will have no effect on the weight. The independent variable was the different solutions of different pH values. The dependent
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were able to receive the nutrient in the 1 cm cell and almost all of them in the 0.5 cm cell. This is caused due to the larger surface area to volume ratio as the cell size depends on the efficiency of the material to flow in and out through diffusion. Through diffusion‚ the organelles in the cell receive all the vitally needed nutrients to survive. If there is a big surface area to volume ratio such as 1:2‚ then this process will be delayed due to the sodium hydroxide having to cover a larger distance
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Extra-Corporeal Membrane Oxygenation (ECMO) is a life-saving treatment for severe respiratory failure irresponsive to mechanical ventilation‚ associated or not with haemodynamic instability‚ and its application fields are widening to refractory sepsis and also to elective thoracic procedures. ECMO is replacing conventional cardio-pulmonary by-pass (CPB) even during lung transplantation due to its potential advantages: the absence of full-anticoagulation and the possibility of maintaining the extra-corporeal
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Through The Tunnel In this story‚ Through The Tunnel‚ there are three settings that all symbolize something different. The safe beach symbolized him still being a child. On the safe beach‚ his mother was there to protect and be there for him. The wild beach was where Jerry wanted to go. It was taking a step out into the world to him. He wanted to be free and become a man. The journey through the tunnel symbolized Jerry going from a child to an adult. He challenged himself to go through the tunnel
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Tanner Sack Mrs.Willett English I‚ Period 5 3 December 2012 Keeping Your Head in It Doris Lessing’s short story‚ “Through the Tunnel” teaches the reader that if you put your mind to something‚ you can achieve anything. The universal theme is revealed through the dynamic struggle of the protagonist and the vivid imagery of the setting. In the beginning of the story‚ Jerry meets the native boys‚ who show him the tunnel. The native boys see one of the older boys swim
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therefore bound a membrane that acts the selective controller of the movement of different substances to and from the cell. This is especially when dealing with the solutes both to and from the cell. Some solutes must be allowed to move into and out of the cell depending on the need and urgency of the very solutes. This membrane is considered to selectively permeable to different solutes and thus will only allow the passage of specific solutes to and from the cell. This implies that the membrane to most cells
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Through the Tunnel by Doris Lessing Conflicts can arise in many ways. In the story “Through the Tunnel” by Doris Lessing‚ an eleven year old boy named Jerry is vacationing at the shore in France. Feeling lonely and bored he wanders off to a rocky beach to join a group of French boys‚ older than he‚ who are diving and swimming there. As a foreigner he finds himself ignored by them‚ but discovers they are swimming through a long underwater tunnel and he is determined that he will do the same someday
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Max Lerner once said “The turning point in the process of growing up is when you discover the core of strength within you that survives all hurt.” Doris Lessing illustrates this point in her short story‚ “Through the Tunnel.” In the short story‚ Jerry‚ a young‚ English boy‚ finds himself by overcoming the obstacles of adolescence. As the story opens‚ readers learn that Jerry‚ who is on vacation with his mother‚ is eleven years old--a time during which many boys begin to distance themselves from their
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of the specialized underlying structures of these life-forms. In order for us to appreciate these special adaptation‚ we first need to know how a typical plant or an animal cell organelle behaves in different water and solute concentrations. In this lab‚ we will determine the effects of hypertonic‚ isotonic and hypotonic solutions on plant and animal cells. In general when an animals cell’s placed in hypertonic solution it shrivels; a plant cell on the other hand undergoes plasmolysis. When an animal
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ABSTRACT The effect of molecular weight on the rate of diffusion was measured using two tests namely: the glass tube test and the agar-water test. The set-up of the glass tube test used two cotton balls of the same size. One cotton ball is moistened with hydrochloric acid (HCl) and the other one is moistened with ammonium hydroxide (NH4OH). The two cotton balls were inserted in both ends of the glass tube. NH4OH which has a lighter molecular weight (35.0459 g/mole) diffused with a faster rate (dave=20
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