the adaxial side of leaf. Clear tape was laid over the nail polish then removed and placed on a microscope slide and placed under a compound microscope. Three sections of each leaf were observed with the highest recorded.
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rate. Set its reading to zero and add 1 to the answer. 4. One student will use a stopwatch to count 30 seconds which is the time during which the measurement of the heart rate will take place. 5. Turn the microscope lamp on and locate the heart of the daphnia through the microscope. 6. Measure the beat rate. 7. Repeat steps 1-6 about 4 or 5 times and get an average. Then calculate the heart beats per minute (just by doubling the average). 8. Clean the cavity slide using a tissue
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oil and a microscope. The steps on page 26 of the Customized Biol 311 General Microbiology Laboratory Manual were used to stain the bacteria. Several changes were made in the procedure. The crystal violet was on the slide for 1 minute rather than 20 seconds. The decolorizing step was used with alcohol for 10 seconds rather than 20 seconds. The only other change was that the safranin was on the slide for 1 minute instead of the recommended 20 seconds. The slide was put under the microscope at 1000x
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structural unit of life. Cork is a substance which comes from the bark of a tree. In 1665‚ Robert Hooke made the observation of a cell through a self designed microscope. Cell is a Latin word which means ‘a little room’. Important: Cells were first discovered by Robert Hooke in 1665. Leeuwenhoek (1674)‚ with the improved microscope‚ discovered the free living cell in pond water for first time. Robert Brown in 1831 discovered the nucleus in the cell. Purkinje in 1839 coined the term
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a light microscope are: inclined reversible monocular body tube‚ virtual image distance 250mm‚ virtual image‚ focusable gravity loaded nosepiece‚ disc aperture diaphragm‚ in-stage condenser‚ light switch‚ in-base illuminator‚ retinal image‚ eye point‚ eye piece‚ field diaphragm and pointer‚ arm‚ infinity corrected zoom objective‚ object‚ slide clip‚ stage‚ fine adjustment knob‚ coarse adjustment knob‚ and base. 8. Low power objective is 10x and high power objective is 40x. (Microscope lab)
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scientific discoveries of the sixteenth‚ seventeenth‚ and eighteenth centuries‚ including microscopes‚ photography‚ and poison detection. In 1590‚ Zacharias Jansen invented the compound microscope‚ which produced a significantly larger image than the traditional magnifying glass. By the 1880’s optical microscopes and the comparison microscope had come into use. With the new and more powerful microscopes‚ a scientist can examine hairs and fibers‚ blood samples‚ or scraps of cloth in order to decide
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3.01 Cell Cycle Lab Report Safety Notes: * Always handle microscopes and glass slides carefully. * Wash your hands after handling the prepared specimens. Materials: * Compound light microscope * Glass microscope slide with prepared onion root tip specimen Purpose: * understand and identify the stages of the cell cycle and mitosis. * apply an analytical technique to estimate the relative length of each stage of the cell cycle. Hypothesis Procedure: I predict that
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see it under the light microscope. In 1883 Hans Christian Gram discovered an important staining method that is used extensively today. The stain is called the Gram Stain. This experiment was done in order to differentiate microbes into two basic groups: Gram positive microbes and Gram negative microbes. The purpose of this experiment was to learn the gram staining method and to observe the characteristics of gram negative and gram positive microorganisms. Materials: Microscope‚ Bunsen burner‚ glass
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cells come from pre-existing cells (Rudolf Virchow) The historical development of the cell theory: 1485 – Leonardo Da Vinci used glass lenses to study small objects 1600 – the first compound microscope was made by Hans and Zacharias Janssen 1665 – Robert Hooke observed cork cells using a compound microscope and described ‘cells distinct from one another’ 1676 – Anton von Leeuwenhoek described unicellular organisms in pond water 1831 – Robert Brown – observed the nucleus in plant and animal cells
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Method and outcome Temperature Volume of solutions Stress of Daphnia Size of Daphnia Time of acclimatisation Microscope‚ counter‚ cavity slide‚ dropping pipettes‚ stop clock‚ distilled water‚ test tubes‚ stop clock Method: Remove 1 Daphnia and place in cavity slide. Remove pond water and replace with distilled water. Leave for 5mins to acclimatise then observe & count heart rate under microscope for 30s‚ multiply number by 2 to calculate beats/min. Repeat with 2 more Daphnia. Repeat again‚ this time
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