microscope lesson and lab - el blog de israel masalesson objectives •list the contributions of 5...
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Microscope Lessonand Lab
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Lesson Objectives• List the contributions of 5 scientists to the
development of the microscope• Explain the different types of microscopes• Identify parts of a compound microscope• Be able to correctly use a microscope• Understand the difference between
magnification and resolution• Be able to calculate magnification
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Important Cell Scientists
• Van Leewenhoek(late 1700s, early1800s)
• Hooke (1665)
• Schleiden (1838)• Schwann (1839)• Virchow (1858)
• Lenses &Microscopes
• Cellular nature ofcork
• Plant cells• Animal cells• All cells from
preexisting cells
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Cell Theory
• All living things are made up of cells• Cells are the units of structure and
function• All cells arise from preexisting cells
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"In the year of1657 Idiscoveredvery smalllivingcreatures inrain water."
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Early Cell Scientists
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Robert Hooke
Early Microscope
Cork Cells
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MicroscopesOne or more lenses that makes anenlarged image of an object.
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Types of Microscopes
• Simple• Compound• Stereoscopic• Electron
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Simple Microscopes
Similar to a magnifying glass and has only one lens.
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Compound Microscopes
Lets light pass through an object and then through two or more lenses.
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Binocular (Stereoscopic)Microscopes
Gives a three dimensional view of an object.(Examples: insects and leaves)
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The Electron Microscope
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Electron Micrographs
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3.1 Parts of a Microscope
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Microscope Parts
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Lesson Objectives• List the contributions of 5 scientists to the
development of the microscope• Explain the different types of microscopes• Identify parts of a compound microscope• Be able to correctly use a microscope• Understand the difference between
magnification and resolution• Be able to calculate magnification
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Lab Objectives• Review parts of the microscope• Find specimens under low and high power• Make a wet mount• Be able to correctly use a microscope• View cheek cells under the microscope• View Volvox under the microscope• Observe Pond water under the microscope
and carefully draw what is observed
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Lab Directions (30 minutes)• Unsafe behavior = immediate loss of lab privledge• Assigned partners and stations• Drawings and answers to questions on a separate
sheet !!!• Letter “e”• Cheek cells• Elodea leaf- No ! (Skip)• Sketch Prepared Slide of Volvox• Pond Samples- Read over directions on making a
wet mount; Put drawings on handout and includethe magnification used (ocular X objective = totalmagnification)
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Seat Work 30 minutes• Complete Microscope Handout• Work on Microscope Unit Review• Review parts of microscope- Vocabulary
Challenge Cards (Cut out)• Quiz on Tuesday of next week !
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Laboratory Clean up• You will be graded on the completeness of your
answers to the analysis questions and on the carefuland detailed drawings you make.
• I will be quizzing you on the parts of the microscope• Your grade is also dependent on you returning all
supplies to the tray and cleaning up your lab space.I will give you a 5 minute reminder.
• All slides need to be cleaned and put back on thetray. You may throw away cover slips.
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Basic Microscope Technique• Working
Distance:
• Depth of Field:
• distance betweenthe specimen andthe objective lens
• thickness of thespecimen that maybe seem in focus atone time
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Basic Microscope Technique• Calculating
TotalMagnification:
• Multiply themagnificationof the ocularlens by themagnificationof the objectivelens
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Magnification vs. ResolvingPower
• Magnification:
• ResolvingPower:
• the ratio of anobject’s image toit’s real size
• measure of imageclarity. Theminimum distancetwo points can beseparated and stillbe distinguished astwo separate points
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Letter “E”
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Cheek Cells
AnimalCells
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Prepared Slide of….
Volvox
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Microscope Lab• Observe the structure of an Elodea leaf
at increasing magnification
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Pond Sample
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Virtual MicroscopeSIMULATION