Background Research Scanning Tunneling Microscope; or STM‚ allows scientists to image or display crystalline material surfaces down to an atomic level. Basically; it shows the formation of surface atoms on conducting and semi-conducting materials such as metals‚ or metalloids. First invented by Gerd Binnig and Heinrich Rohrer in 1981; the Scanning Tunneling Microscope used quantum tunneling to extract atomically resolved images to understand the morphology of crystalline surfaces including both
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white tile‚ stopwatch‚ microscope slide‚ coverslip‚ filter paper‚ Light microscope Method: 1) A piece of banana was place on a tile and a section was cut across the piece of banana about 5mm thick. 2) The surface of the banana was covered with iodine solution and left for about one minute. 3) The distribution of starch in the section of the banana was then illustrated in the outline below. 4) With the remaining piece of banana a microscope slide was wiped across
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viewed by ________ spore staining. scanning electron microscopy. Gram staining Negative stain Section: True or False 7. Fluorescent microscopes use an ultraviolet (UV) light source and fluorochromes as stains. True False 8. Older‚ pure cultures of Gram-positive organisms can appear red when Gram stained. True False Section: Matching 9. Which microscope is used to view internal structures of unstained‚ living cells? Scanning electron microscope Dark-field microscopy Transmission
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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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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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used for carrying out energy and are said to be powerful for non-invasive processing of materials (Miffin‚ 2002). The microwave energy offers relatively large specimens to have the ability of good preservation of cellular structure for light and electron microscopy giving it minimal changes to the cellular biochemistry and antigenicity of the specimen (Neuroski‚ 1994). Microwave stabilization‚ fast and ultrafast primary microwave-chemical fixation are common methods used to fix specimens (Neuroski
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above 2. A student in a cellular biology laboratory is faced with the task of detecting protein X in muscle cells taken from a rat. The tissue is required to be live while under analysis. The student also is presented with numerous types of microscopes and is asked to choose the one to complete his task. Which type of microscopy
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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 back and forth
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Introduction to Microscope Circa 1000 AD. = the first vision aid was invented (inventor unknown) called a reading stone. Circa 1284= Italian‚ Salvino D’ Armante is credited inventing the first bearable eye glass. 1590= two dutch eye glass makers‚ Zaccharias Janssen and Hans Janssen experimented with multiple lenses. 1665= English Physicist‚ Robert Hooke looked at a silver of cork through a microscope lens and noticed some “pores” or “cells”. 1674= Anton Van Leeuwenhoek built a simple microscope with
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helped to advance the cell theory Robert Brown’s microscope Robert Hooke’s microscope Transmission electron microscope Modern light microscope Scanning electron microscope 4) Describe evidence to support the cell theory 5) Discuss the significance of technological advances to developments in cell theory 6) Draw the plant and animal cell 7) Assess the impact of technology including the development of the microscope on the development of the cell theory. 8)
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