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What is a purified high-molecular-weight complex polysaccharide derived from seaweed used in immunodiffusion?
Agarose
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What is the process where antigen and antibody diffuse toward each other in a gel matrix?
Passive immunodiffusion
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What factors affect the rate of diffusion in a gel matrix?
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What is the immunodiffusion technique involving migration of antigen only into a gel with antibody?
Radial immunodiffusion (RID)
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What is the term for the point when the precipitation ring forms a stable lattice network in RID?
Zone of equivalence
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What is the mathematical relationship in RID between the square of the ring diameter and antigen concentration?
Direct proportionality
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What is the typical time range for antigen diffusion to reach equivalence in RID?
24 to 72 hours
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What RID method uses early ring diameter measurements and semi-log plots?
Kinetic or Fahey method
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What is a source of error in immunodiffusion assays related to sample preparation?
Overfilling or underfilling wells
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What classic immunochemical technique involves antigen and antibody diffusion in two dimensions?
Ouchterlony double diffusion
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What is the geometric layout of wells in an Ouchterlony plate?
One central well surrounded by 4–6 equidistant outer wells
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What does it mean when precipitin lines fuse to form an arc in Ouchterlony diffusion?
Identity (common epitope)
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What does it mean when precipitin lines cross without fusion in Ouchterlony diffusion?
Non-identity (no shared epitopes)
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What pattern shows fusion with a spur in Ouchterlony diffusion indicating partial epitope sharing?
Partial identity
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What does the direction of the spur point to in partial identity patterns?
The simpler antigen
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What incubation apparatus maintains moisture for immunodiffusion plates?
Moist chamber
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What is the typical incubation duration for Ouchterlony double diffusion?
12 to 48 hours
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What is a clinical use of Ouchterlony double diffusion?
Identification of antibodies to fungal organisms such as Aspergillus, Blastomyces, Coccidioides, and Candida
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What is a reason for the decreased use of immunodiffusion in clinical labs today?
Labor intensity, long turnaround time, and technical artifacts
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What is the main advantage of immunodiffusion methods despite their limitations?
Simplicity and no need for instrumentation
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What role does agarose play in immunodiffusion assays?
Stabilizes diffusion and allows visualization of precipitin bands
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What is the definition of passive immunodiffusion?
Diffusion of antigen and antibody in a gel without electrical current
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How does increasing temperature affect immunodiffusion reactions?
Speeds up the rate of diffusion and reaction
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How does particle size affect diffusion in a gel matrix?
Larger particles migrate more slowly than smaller particles
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What does measuring the diameter of precipitation rings in RID reflect?
It reflects the amount of antigen present
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Why is accurate ring diameter measurement important in RID?
Precision directly affects antigen concentration determination
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Why is using antigen standards important in RID?
To create a standard curve for quantitation of unknown samples
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What is the relationship between antigen concentration and precipitation ring diameter in the kinetic RID method?
Ring diameter is proportional to the logarithm of antigen concentration
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What is a potential consequence of nicking the side of wells during immunodiffusion sample application?
Sample leakage, leading to inaccurate results
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What type of immune complexes are detected by immunodiffusion assays?
Various immune complexes including antibodies and antigens
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What are insoluble antigen–antibody lattices?
They are complexes formed when antigens and antibodies bind together, leading to precipitation in a gel.
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What happens when antigen–antibody lattices precipitate?
They form solid structures that can be observed in gel-based assays.
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In which medium do insoluble antigen–antibody lattices typically precipitate?
In a gel medium during immunological assays.
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What is the significance of precipitation in immunology?
It indicates the presence of specific antigens or antibodies in a sample.
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What role do antibodies play in forming lattices?
Antibodies bind to specific antigens, leading to the formation of insoluble complexes.
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What is the outcome of a successful antigen-antibody reaction in a gel?
Formation of visible precipitates indicating a positive reaction.
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What is a gel-based assay?
A laboratory technique that uses gel to detect the presence of antigens or antibodies.
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What does the term lattice refer to in immunology?
A network of interconnected antigen-antibody complexes that precipitate.
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Why are insoluble lattices important in laboratory diagnostics?
They help in the identification and quantification of specific antigens or antibodies.
Navegue pelos seus cards aqui, ou sign up to study with spaced repetition.
What is a purified high-molecular-weight complex polysaccharide derived from seaweed used in immunodiffusion?
Agarose
What is the process where antigen and antibody diffuse toward each other in a gel matrix?
Passive immunodiffusion
What factors affect the rate of diffusion in a gel matrix?
What is the immunodiffusion technique involving migration of antigen only into a gel with antibody?
Radial immunodiffusion (RID)
What is the term for the point when the precipitation ring forms a stable lattice network in RID?
Zone of equivalence
What is the mathematical relationship in RID between the square of the ring diameter and antigen concentration?
Direct proportionality
What is the typical time range for antigen diffusion to reach equivalence in RID?
24 to 72 hours
What RID method uses early ring diameter measurements and semi-log plots?
Kinetic or Fahey method
What is a source of error in immunodiffusion assays related to sample preparation?
Overfilling or underfilling wells
What classic immunochemical technique involves antigen and antibody diffusion in two dimensions?
Ouchterlony double diffusion
What is the geometric layout of wells in an Ouchterlony plate?
One central well surrounded by 4–6 equidistant outer wells
What does it mean when precipitin lines fuse to form an arc in Ouchterlony diffusion?
Identity (common epitope)
What does it mean when precipitin lines cross without fusion in Ouchterlony diffusion?
Non-identity (no shared epitopes)
What pattern shows fusion with a spur in Ouchterlony diffusion indicating partial epitope sharing?
Partial identity
What does the direction of the spur point to in partial identity patterns?
The simpler antigen
What incubation apparatus maintains moisture for immunodiffusion plates?
Moist chamber
What is the typical incubation duration for Ouchterlony double diffusion?
12 to 48 hours
What is a clinical use of Ouchterlony double diffusion?
Identification of antibodies to fungal organisms such as Aspergillus, Blastomyces, Coccidioides, and Candida
What is a reason for the decreased use of immunodiffusion in clinical labs today?
Labor intensity, long turnaround time, and technical artifacts
What is the main advantage of immunodiffusion methods despite their limitations?
Simplicity and no need for instrumentation
What role does agarose play in immunodiffusion assays?
Stabilizes diffusion and allows visualization of precipitin bands
What is the definition of passive immunodiffusion?
Diffusion of antigen and antibody in a gel without electrical current
How does increasing temperature affect immunodiffusion reactions?
Speeds up the rate of diffusion and reaction
How does particle size affect diffusion in a gel matrix?
Larger particles migrate more slowly than smaller particles
What does measuring the diameter of precipitation rings in RID reflect?
It reflects the amount of antigen present
Why is accurate ring diameter measurement important in RID?
Precision directly affects antigen concentration determination
Why is using antigen standards important in RID?
To create a standard curve for quantitation of unknown samples
What is the relationship between antigen concentration and precipitation ring diameter in the kinetic RID method?
Ring diameter is proportional to the logarithm of antigen concentration
What is a potential consequence of nicking the side of wells during immunodiffusion sample application?
Sample leakage, leading to inaccurate results
What type of immune complexes are detected by immunodiffusion assays?
Various immune complexes including antibodies and antigens
What are insoluble antigen–antibody lattices?
They are complexes formed when antigens and antibodies bind together, leading to precipitation in a gel.
What happens when antigen–antibody lattices precipitate?
They form solid structures that can be observed in gel-based assays.
In which medium do insoluble antigen–antibody lattices typically precipitate?
In a gel medium during immunological assays.
What is the significance of precipitation in immunology?
It indicates the presence of specific antigens or antibodies in a sample.
What role do antibodies play in forming lattices?
Antibodies bind to specific antigens, leading to the formation of insoluble complexes.
What is the outcome of a successful antigen-antibody reaction in a gel?
Formation of visible precipitates indicating a positive reaction.
What is a gel-based assay?
A laboratory technique that uses gel to detect the presence of antigens or antibodies.
What does the term lattice refer to in immunology?
A network of interconnected antigen-antibody complexes that precipitate.
Why are insoluble lattices important in laboratory diagnostics?
They help in the identification and quantification of specific antigens or antibodies.
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