Basic Laboratory Skills – Make Up Module
General Lab Information – All lab units will be structured with Pre-Lab, In-Lab, and Post-Lab sections. You will work through some activities on your own before lab (Pre-Lab), other activities will be worked on as a group during your lab time (In-Lab), and there will generally be follow-up Post-Lab work. Be sure to check the Lab Schedule EACH WEEK before and after Lab. As you work through activities, you should answer all questions in your lab manual.
The In-Lab portion of lab will be held as a Zoom lab session during your regularly scheduled lab section meeting time. Please access the link below to set up the Zoom client on your computer. You will need to authenticate to be able to access the Zoom sessions. All of the instructions to get started and for authenticating are available at this site:
Getting Started with Zoom
Complete the following before you come to lab:
Make Up Module
Introduction to Lab 1:
- Read the following: Getting Oriented (pp. vi-ix), Lab Unit 1 (pp. 1-10), and Appendix A (pp. 197-201) before coming to the first Lab Meeting.
- Fill out and sign the Safety Statement (p. ix).
Activity One: Basic Microscopy
- Complete Activity One: Basic Microscopy (p. 2-3)
- View the following video: Microscope Basic Set up and Use
- Use the Virtual Microscope
- Click the “Learn” button to review what you learned in the Microscope video
- Click the “Explore” button to examine various slides. Start with “sample slides” and then view other slides.
- Click the “Test” button to assess your knowledge.
Activity Two: Determining Total Magnification (p. 3)
- Follow the directions in the lab manual to complete Table 1-1 and include it in the Pre-Lab assignment.
Make up Module
Activity Three: Determining Field of View and Cell Size (p. 3-4)
- Complete Activity Three: Determining Field of View and Cell Size.
- View the following video: Measuring with the Microscope
- Demonstrate how you would Calculate the Field of View and Cell Size for the example found in the Post-Lab Assignment Handout. Be sure to show your work on how you set up your calculations.
- This Updated Table 1-2 may help you with these calculations “in-Lab” and for the Post-Lab Assignment.
Activity Four: Examining Live Specimens (p. 5-11)
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- You will need the knowledge/skills from Activities 1-3 (Pre-Lab and first part of the In-Lab work) to effectively carry out Activity 4. Your TA will assign you the Code (A, B, C or D) for an unknown organism to study. You may also be assigned to work with other students who missed lab this week or your TA will serve as the “other group” to supply you with additional information.
- Read the introduction to Activity 4. In the procedure, you will replace Step #2 (making your own wet mount slide) with watching an assigned video clip of an unknown microorganism, “Organism X” (see below). Start with step #3 to draw and record observations about your assigned organism on page 7. These observations are statements determined by using any one of a person’s five senses (empirical reasoning). It is typically the first step in the Scientific Method and can lead to hypotheses.
- Label all notes and drawings with date, time, and place.
- Record all results as you observe/collect them; don’t rely on memory.
- Make sure to record what you SEE, not what you THINK should be there.
- Detail is key, pay attention to even the smallest things.
- Once you have recorded your individual observations and drawing on page 7, you will compare your observations with other students in your group (if there are others). Then, as a group or on your own, you will need to write a more comprehensive description of your organism in Table 1-3 on page 9 without any sketches or diagrams. Another group (or your TA) will use your description (Table 1-3, page 9) to identify the organism based solely on your written information (no sketches or pictures) with a set of microscope images of many possible protist species.
- In turn, you will also need to ID an unknown Protist species based on a written description from another group and a set of microscope images of many possible protist species supplied by your TA. You should be prepared to defend your identification choice of the unknown organism via email with your TA (or possible office hour/Zoom meeting).
- If you cannot correctly identify the organism based on the provided description, you will need to ask the TA to edit/provide more information until you can correctly identify the unknown organism.
- Thoughtful and precise scientific communication is key to this activity and to all your laboratory work this semester. It is also vital to the peer review process – be it for class work or for publishing scientific literature.
Organism X – Unknown Organism videos to use in place of making your own slides.
The 4 different organisms below were filmed with a 10X ocular lens and a 10X objective lens (Videos A-D). The width of these microscopes videos, left to right, is the field of view. The field of view for each video is 1.4 mm (1400 µm).
Make Up Module
- Complete the Post-Lab assignment and turn this in by the usual due date – 48 hours after the start of your regular lab day/time.
- Activities One-Three should be used when answering Questions #1-5. For #5 you should use an example slide from the Virtual Microscope simulation (Pre-Lab) to make your sketches. Question #6 refers to Activity Four.
The Compound Light Microscope
Microscopy:
- Care and Use of Microscopes – See Appendix A in your Lab Manual
- Video on How to Use a Compound Microscope
- Basic Concepts of Microscopy
- Measuring with the Microscope – how to determine the field of view and cell size
- Exploring Magnification: Power of Ten video – from 10 million light years away from the Milky Way down to 100 attometers!
- Virtual Microscope