To investigate the effect of different caffeine concentration on the heartbeat rate of Daphnia at room temperature. Introduction: Caffeine is found‚ and produced in many plant species to function as a natural pesticide‚ and as an inhibitor of seed germination of other nearby coffee seedlings to give it a better chance of survival. Caffeine is able to paralyze and kill certain insects upon feeding on the plants that produce caffeine. Coffee‚ tea and cocoa are common caffeine-containing
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Electron microscopes produce magnified images by focusing beams of electrons. -most commonly used microscope • Compound light microscopes – allow light to pass through the specimen and use two lenses to form an image. • Electron microscope- use beams of electrons‚ rather than light‚ to produce images. • Transmission electron microscope (TEMs) shine a beam of electrons through a thin specimen. • Scanning electron microscopes (SEMs) scan a narrow beam of electrons
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can you observe in an onion cell when using a compound light microscope? Hypothesis. On your lab report‚ below your Problem‚ write a Hypothesis that will “answer” the problem. Start your hypothesis with‚ “If onion cells are observed under a microscope‚ then….” Have Ms. Jonzon approve your Hypothesis before moving on. Materials. You do not need to copy out this list of Materials (or the Procedure
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organic compounds from carbon dioxide and water 10. chromatin- The complex of DNA and proteins that is the composition of an eukaryotic chromosome. Chromatin appears as a mass of very long‚ thin fibers when the cell is not dividing and under a light microscope it is not visible 11. chromosome- Similar to that of a thread‚ this structure carries genes and is found within the nucleus. Each chromosome is made up of a single very long DNA molecule and other associated proteins. See chromatin 12. communicating
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preparation is …… in light microscope and ……. in electron microscope. 3- Fixative used in tissue preparation for LM examination is …….. while in EM is …….. 4- Substance used for tissue embedding in preparation for LM examination is ……..… while in EM is ………... 5- The most common dye use in routine histology is …….. . 6- The resolution power is …………………….. 7- The resolution power for LM is……… and for EM is ………. 8- The source of illumination in electron microscope is a beam of high velocity ……
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circulatory system relies on diffusion and it being fast which is why the majority of organisms with open circulatory systems are small. They have transparent bodies which make them ideal for this experiment so the heart can be observed easily under the microscope. They are very particular about the habitat they live in and whether they flourish in an area can be brought down to levels of: salinity‚ dissolved substances‚ oxygen‚ pH and ammonia and temperature. [pic] Caffeine – Caffeine is known as
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Technology to Overcome The Limitation of Sight and Hearing Introduction Devices to overcome Limitations of sight Microscope Binoculars Function: Binoculars are used for viewing far objects like buildings‚ birds‚ and much more. Other information related to the devices Telescope The earliest recorded working telescopes were the refracting telescopes that appeared in the Netherlands in 1608. Their development is credited to three individuals: Hans Lippershey‚ Zacharias Janssen and Jacob Metius. Binoculars
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Report 2 Microscope and the Cell Template Student: Mavon Riley Email: shantariley@yahoo.com Date: 09/05/2014 I. Purpose of the Microscope II. The Compound Microscope EXERCISE 2.1 – Label the parts of the compound microscope 1. Eyepiece 2. Arm 3. Course Adjustment 4. Fine Adjustment 5. Revolving Nose piece 6. Objective Lenses 7. Stage Clips 8. Stage 9. Iris Diaphragm Lever 10. Condenser 11. Light Source 12. Base EXERCISE 2.2 – Calculate microscope magnification
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in the early 1600s‚ in the Netherlands‚ where the spectacle maker‚ Zacharias Jansen‚ invented the first compound microscope along with the first telescope. The microscope became an instant hit and everyone was buying these contraptions except for a fellow Dutchman by the name of Anton van Leeuwenhoek. Instead of buying a microscope‚ he decided to make one for himself. His microscope was a unique invention‚ indeed‚ with the appearance of a wooden disk connected to metal screws. After Leeuwenhoek
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Making things look bigger When you use an optical instrument‚ whether it be something very simple like a magnifying glass‚ or more complicated like a telescope or microscope‚ you’re usually trying to make things look bigger so you can more easily see fine details. One thing to remember about this is that if you want to make things look bigger‚ you’re always going to use converging mirrors or lenses. Diverging mirrors or lenses always give smaller images. When using a converging lens‚ it’s helpful
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