"wonderful year." The phenomenon was observed as early as 1765‚ but not described or studied in detail until the botanist Robert Brown’s research in 1827. Brownian motion is named in honor of his work. As a botanist‚ Brown first observed the effect in pollen floating in water‚ where it is visible with the naked eye. Through experimentation‚ Brown determined that the specks of pollen were not propelling themselves independently‚ but rather that their motion was pseudo-random. Jean Perrin‚
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Abstract: Osmosis is the transport of water across a selectively permeable membrane from a region of a higher water chemical potential to a region of lower water chemical potential. (Tzahi 2006) To demonstrate osmosis lab‚ artificial cells were made with various sucrose concentrations and were placed into beakers of different sucrose solutions. Overall the results showed that the higher percentage of concentration gradient of sucrose‚ the more the artificial cells absorbed. Introduction: The
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The skin is the biggest organ in the body and is responsible for many functions in the body. In many ways‚ the skin provides numerous important functions to the body. The skin is broken into 3 main layers‚ the epidermis‚ the dermis‚ and the hypodermis. The epidermis is the outer layer of the skin which includes 3 different cells: Keratinocytes that produce keratin‚ Melanocytes that produce melanin‚ and Dendritic cells that combine with nerve endings. The dermis is the middle layer‚ which is made
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1. The most surprising experience was that all people we interviewed were supportive. They shared their opinions‚ personal stories‚ and feelings freely. What went well include the team work‚ the communication with the targeted audience‚ and the insights’ generation. The team spirit was spectacular. All team members were engaging and well prepared. Each one treated others with respect and welcomed different voices. As a result‚ the team perform well in the task and had a lot of laughs and joys.
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In the course of last week‚ me and my partner have been working to build a boat that could withstand the weight of some pennies while in water without sinking. In the end we ended up with a semi decent boat‚ this is how we did it. In the end‚ my partner Tobi and I made a very tiny boat mostly made of aluminum foil with two straws on the bottom to help it balance. This boat was held together by durable scotch tape. Our boat used a 21.5 by 14 cm square of foil‚ our boat was 6 cm on the short side and
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is a very serious type of skin cancer that can be caused by being exposed to ultraviolet rays. In most cases‚ these ultraviolet rays usually come from the sun‚ but they can also come from other artificial sources such as tanning booths (1). Exposure to ultraviolet rays damages your skin‚ but it usually takes several years before this damage leads to health problems such as melanoma (1). The skin is made up of three layers which are the epidermis‚ the outer layer of skin‚ the dermis‚ which is the
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One purpose of the experiment was to gain an understanding of diffusion and osmosis‚ specifically in context of a plant or animal cell reaction to an isotonic‚ hypotonic‚ or hypertonic solution. Another objective was to understand the nuances of simple diffusion‚ facilitated diffusion‚ and active transport and to explicate the characteristics affecting the rates of diffusion. The next objective was to be able to explicate the partition coefficient and its influence on hemolysis. The final objective
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ab: Observing a Chemical Reaction Name: Deja Eason Period: 5th Period Partners: Melingh Patterson‚ Tori Millens Date Performed: 9/2/11 Teacher: Mrs. Medina Abstract: This experiment was all about observing a chemical reaction. During the experiment‚ we made observations and possible explanations on why Copper(II)Chloride Dehydrate and Aluminum foil created a chemical reaction. The observations were made by using Copper Chloride‚ Aluminum foil‚ and Distilled water. Before the Aluminum
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The Skin I’m In was an easy read written by Sharon G. Flake about a seventh grader named Maleeka Madison. This bright Seventh grader attended McClenton Middle School where she dealt with all the issues that come with trying to fit in and be accepted by your peers. These issues along with the death of Maleeka’s dad a couple years ago started to become very overwhelming and caused her to conduct herself in ways that mad e no sense at all. Although so many people didn’t understand what exactly was going
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fine if we did not want to be bothered with the use of glasses. Everyone would prefer a practical‚ but as we all know the use of soft contact lens care is more demanding. Mishandled in terms of keeping it clean will not be affected eye irritation and red. Surely if allowed to drag on can damage the eye. Lighting conditions are less read with an eye to accommodation maximum force‚ accommodation is the ability of the lens to thicken and thin out in accordance with stimuli from outside the state. With
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