Card Set Information
Instrumentation Final Comprehensive
What is a thermocycler?
A PCR machine that amplified DNA fragments millions of times
How does the PCR reaction work?
94 Heat- denature
52 Cool- anneal primers to template
72 Warm- extends and replicates
Repeats 35 cycles
What is a spectrophotometer?
A device for measuring light intensity
What 4 things can happen when light strikes matter?
What is transmittance?
The ratio of amount of light passed through the sample, compared to the amount of light passed through the blank
What is the equation for absorbance?
Absorbance = -log (transmittance)
What is the relationship between concentration compared to transmission and absorbance? (as concentration increases)
What is the equation for the line for concentration?
Absorbance = (slope of line)(Concentration)
What is a centrifuge?
A mechanical device that accelerate the rate of sedimentation by rapidly spinning and increasing centrifugal force
What is the formula to calculate relative Centrifugal field? (RCF)
RCF = 11.2 x r (RPM/1000)
What is the equation for calculating RPM from g force?
RPM = 1000 x [RCF/ (11.17 x r)]
What determines the rate of sedimentation?
relative centrifugal field
Size of particles
What is the sediment coefficient (S)?
The value that expresses the rate of sedimentation for a given particle
The larger the value the quicker it will sediment
What materials are used to make preformed gradients?
What 3 ways are centrifuges classified based on mode of operation?
Differential (Pellet and Supernatant)
Density (Separation of fluids through density gradient)
Continuous (large scale and supernatant is slowly discarded)
What 2 methods of centrifugation is used in density gradient?
What are the 3 styles of centrifuge rotors?
Horizontal (good for cells, takes longer)
Fixed Angle (sheers cells (bad), very quick though)
Vertical (used for buoyant density separation)
What is the optimal temperature, humidity, and CO
level for mammalian cells growth?
What percent of contaminates does the HEPA filter in the incubator remove?
How is the CO
level in the incubator monitored and controlled?
Ours- Thermal conductivity (TC) sensor
Infrared (IR) sensor
What is magnification?
The ability to enlarge the visual image of the specimen.
What is resolving power?
The power to distinguish between 2 points as distinct separate entities
What is resolution?
The limit at which two small objects can be distinguished from each other.
What is oil immersion?
A technique to maximize resolution of fixed cells
What is a field of view?
The amount of specimen that can be seen through the microscope
What is working distance?
Distances between the objective lens and the specimen
What is the most commonly used microscopy imaging technique?
Brightfield (light is passed through or reflected off a specimen)
What is the difference between a TEM and SEM microscope?
TEM - 2D
What is pH and how is it measure?
Measurement of alkalinity or acidity
pH= -log [H+]
What is an osmometer?
A device for measuring the osmotic strength of a solution
What is accuracy of a balance?
The correctness of the measurement
What is precision?
The consistency of the instrument
What is sterilization?
Total destruction of all forms of life