introduction to the microbiology lab
DESCRIPTION
Introduction to the Microbiology Lab. Exercises 1-2, 2-1, 3-1, and 3-3. Laboratory Safety. Bio Safety Levels. Student Conduct. Do NOT smoke, eat, drink, or bring food or drinks into the laboratory room Do NOT apply cosmetics or handle contact lenses - PowerPoint PPT PresentationTRANSCRIPT
Introduction to theMicrobiology Lab
Exercises 1-2, 2-1, 3-1, and 3-3
LABORATORY SAFETY
Bio Safety Levels
Student Conduct
• Do NOT smoke, eat, drink, or bring food or drinks into the laboratory room
• Do NOT apply cosmetics or handle contact lenses• Wash your hands thoroughly with soap and water after
handling microbes AND before leaving the laboratory room each day
• Do NOT remove organisms or chemicals from the laboratory
• Work carefully and methodically• COME PREPARED TO LAB FOR THAT DAY’S WORK
Basic Laboratory Safety
• Wear your lab coat and gloves while working in the laboratory– Remove them before leaving– Discard gloves appropriately (not in standard trash)
• NO OPEN-TOED SHOES OR SANDALS• Turn off Bunsen burners when not in use• Secure loose hair and clothing when working with an
open flame• Never pipette by mouth
Safety Equipment
• Know the location of the First Aid Kit• Know the location and proper way to use the
Fire Blanket, Shower, and Fire Extinguisher• Know the location and proper way to use the
Eye Wash Basin
• NOTIFY YOUR INSTRUCTOR OF ANY EVENT THAT NECESSITATES THE USE OF THESE
Reduce Risk of Contamination
• Clean bench with disinfectant before and after lab– 70% alcohol can also be used as a disinfectant– Allow to air dry rather than wipe up
• Never lay culture tubes on bench top• To clean spills: cover with paper towels, saturate with
disinfectant and leave for 20 minutes– Discard in appropriate container
• Place non-essential books, etc. out of the way of your experiments
Disposing of Contaminated Materials
• Broken glassware, needles, wooden cotton swabs, etc. MUST be placed in the “sharps” container
• Culture tubes are to have any labels removed and placed upright in racks on the “kill” cart
• Petri dishes can be discarded into solid waste on the “kill” cart WITHOUT removing the labels
• Gloves are to be discarded in the appropriate biohazard containers
Care of Microscopes
• Microscopes are located at each lab station• Following their use, microscopes:
1. Should have all oil removed from the lenses using LENS PAPER and cleaning solution• YOUR INSTRUCTOR WILL INSPECT THEM BEFORE YOU ARE
PERMITTED TO LEAVE
2. Scanning (4X) lens should be in place3. Stage should be at lowest setting4. Rheostat should be adjusted to its lowest setting5. Cord should be wrapped carefully around the base and
not “flopping” around
Care of the Lab
• Place seats back under benches before you leave
• Wipe down the sink-tops with paper towel if you are among the last students in the lab– Remove any paper towels left behind by less
conscientious students
THE LAB SHOULD LOOK AS NICE AFTER YOU ARE DONE AS IT DID BEFORE YOU STARTED
SCAVENGER HUNT
Essential Equipment• Security Phone• Disinfectant• Antiseptic Hand Solution• Fire Extinguisher• Emergency Shower
– With Eye Wash• Fire Blanket• MSDS Folder• Biohazard Waste Container• Biohazard Sharps Container• Broken Glass Container• “Kill” Cart
• Incubators• Refrigerated Cold Room• Biological Safety Cabinet• Vortex Mixers• Microscopes• First Aid Kit• Chemical Spill Kit• Microbiology Lab Tools• Autoclave• Fire Alarm• Escape Routes• Gas Shut-off
New Experiments
EXERCISE 1-2GLO-Germ Hand Wash Sanitation System
Glo Germ Hand Wash System
• Effective hand washing minimizes transmission of pathogens by health-care workers and food handlers
• How Effective Is Your Hand Washing Technique?
• Follow the directions outlined in the lab manual…– Work in groups of 2 with one person applying the Glo Germ
gel and the other person holding the UV lamp– Do NOT hold UV lamp if you also have Glo Germ applied– TURN UV LAMP OFF WHEN EXERCISE IS COMPLETE
EXERCISE 2-1The Ubiquity of Microorganisms
Ubiquity of Microorganisms
• Many microbes can easily be isolated from a variety of environments – Soil, water, plants, and animals
• Just how ubiquitous are microbes?
• Follow the directions outlined in the lab manual…– You will work in groups of 4 – Incubate plates 1, 2, and 8 at 25oC.– Incubate plates 3, 4, 5, 6, and 7 at 37oC.
EXERCISE 3-1Introduction to the Light Microscope
Principles of Light Microscopy
• Illumination– Stains add contrast to specimens
• Magnification– Compound microscope has paired ocular lenses and an
objective lens• Resolution (Resolving Power)– Clarity of an object viewed under the microscope– Distance that two points must be apart to appear as two
distinct points– Resolution of typical light microscope is 0.2μm
Parts of the Light Microscope
Involved in Illumination• Base• On/Off Switch• Lamp (Bulb)• Light Intensity Knob• Sub-stage Condenser• Iris Diaphragm
Involved in Magnification/Focus
• Stage• Stage Mechanisms• Course/Fine Adjustment• Revolving Nosepiece• Objective Lenses
– 4X, 10X, 40X– 100X (Oil Immersion)
• Ocular Lenses
EXERCISE 3-3Microscopic Examination of Eukaryotic Microbes
Examination of Eukaryotic Microbes
• Follow the directions outlined in the lab manual…– You will work individually with your own microscope, but feel
free to divide the specimens up equally for purposes of seeing everything:
Oscillatoria sp. AmoebaSaccharomyces cerevisiae Giardia lambliaAspergillus sp. Spyrogyra sp.Rhizopus sp. DiatomsEuglena sp. Volvox sp.Paramecium caudatum Dog tapewormHuman louse Plasmodium sp. (in RBCs)