scientist Antonie van Leeuwenhoek developed the first known microscope using a single magnifying lens. He was the first person to observe microscopic cells that we now know to be bacteria and blood cells. Leeuwenhoek shared the designs of his microscope‚ as well as his observations‚ with the scientific community. * Around 1655 the English scientist Robert Hooke used van Leeuwenhoek’s ideas and made the first compound light microscope‚ which used more than one lens to magnify an object. He examined
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functioning‚ the microscopy market can be segmented as optical microscopes‚ electron microscopes‚ and scanning probe microscopes. The optical microscopy segment represented the largest market share of the overall advanced microscopy instruments market in Latin America. However‚ this is the slowest growing market with an expected CAGR of 8.9% during 2010-2015. Optical microscopes are losing their market to electron and scanning probe microscopes which are expected to grow at a CAGR of 12.1% and 19% respectively
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BIO 131 Lab #2 Drawings of Animal and Plant Cells Instructions: 1. Set up light microscope for use. Handle with care. 2. Obtain a slide of animal cells and observe first under low-power (4X)‚ then under medium power (10X)‚ then finally switch to high-power (40X). 3. Make careful observations of the structure of the cells. 4. Draw what you see under high power on a sheet of paper. Place your drawing in a circle measuring 10-15 cm. Use only pencil‚ draw neat lines‚ do not shade. The title
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purposes. Agars main purpose is to act as a growth medium for micro-organisms such as bacteria and fungi. The micro-organisms feed off the nutrients contained in Agar and can be both cultured and observed within it by scientists and the use of a microscope. Using Agar A drop‚ equivalent to10ml‚ of the substance being tested needs to be placed and spread over the Agars surface using a non-absorbent sterile tool (a teaspoon can suffice however a glass rod is preferable). It is important that the experiment
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cleaning wipe was placed over the cover slip. 9) The eraser end of a pencil was then taken and the holder pressed down on the tip firmly without twisting the slide or breaking the cover slip. 10) Finally‚ once completed‚ the slide was taken to a microscope for counting. *Prior to the lab‚ two sets of onion root tips were prepared. The control group was treated with water‚ and the experimental group was treated with lectin. Bottles 1 and 3 contained the lectin treated root tips and bottles 2 and
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Lab Report Problem: What does a cheek cell look like? Hypothesis: A group of cells that look like a brick wall with a possibility to see something moving. Materials: * Microscope * Tweezers * Syringe * Wet mounts(Slides and slide covers) * Toothpicks * Onion(Onion cell) * Methylene blue stain water * Water * Cheek skin(Cheek cell) Procedure: Onion Cell 1. Create a wet mount(using water‚ a syringe‚ slides and slide covers of course) 2. Use
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able to conduct the detailed analysis of cultured plates with growth‚ so not results are available for this test. Discussion: For the Feulgen’s/Schiff’s Stain that tests for DNA‚ the samples that contain DNA will show up under a compound light microscope as a magenta color while samples that do not contain DNA will not show up as magenta. A sample of bacteria from an agar plate was used as a control for the DNA test‚ and it showed up as magenta from the Feulgen stain; this confirms that the test
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Do Electrons Really Exist? Science has defined the nature of the world through an assortment of things that are observed in the physical world and those that are unobservable‚ improvable theories that explain the world. Electrons are unobservable. We cannot experience their existence with our own human senses. Do electrons really exist‚ or are they just useful fictions? Antirealists would explain that they do not exist because you cannot observe them. Realists would argue that electrons
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Virtual Lab Unit 3 1. Briefly describe the steps required to aseptically transfer bacteria from an unknown to a tube of liquid broth. You might have to research this using the "T" button (Tell Me More About...) To aseptically transfer bacteria from an unknown to a tube of liquid broth you have to flame the loop or wire before you begin to sterilize it. You then remove the caps from the tubes and flame the mouths of the tubes to prevent air-borne contamination. When all this is done‚ you have to
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other cell through cell division 5 types of different Microscopes 1. Light Microscope- produces 2-D image Direct descendants of Hooks scope> take two lenses to a light source> used this to magnify images up to 1‚000 fold. 2. Confocal Microscope- uses lenses& a light source> produces a 3-D image. 3. Fluorescence Microscope- 2-D or 3-D‚ allows us to visualize fluorescent dyes. 4. Transmission Electron Microscope- it shoots a bean of electrons through a sample‚ and it collects whatever passes through
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