2) Explain the concept of ELISA and the type of antibodies used for the exam strips within pregnancy tryout?
Answers:
Enzyme-Linked ImmunoSorbent Assay, or ELISA, is a biochemical technique used mainly within immunology to detect the presence of an antibody or an antigen in a taster. The ELISA has be used as a diagnostic tool in drug and plant pathology, as well as a power control check in multiple industries. In simple terms, contained by ELISA an unknown amount of antigen is affixed to a surface, and then a specific antibody is wash over the surface so that it can bind to the antigen. This antibody is linked to an enzyme, and contained by the final step a substance is added that the enzyme can convert to some detectable signal. Thus in the suitcase of fluorescence ELISA, when light is shone upon the taster, any antigen/antibody complexes will fluoresce so that the amount of antigen in the taste can be measured.
Performing an ELISA involves at least one antibody next to specificity for a particular antigen. The preview with an unknown amount of antigen is toothless on a solid support (usually a polystyrene microtiter plate) either non-specifically (via adsorption to the surface) or specifically (via invasion by another antibody specific to the same antigen, contained by a "sandwich" ELISA). After the antigen is immobilized the detection antibody is added, forming a complex near the antigen. The detection antibody can be covalently linked to an enzyme, or can itself be detected by a minor antibody which is linked to an enzyme through bioconjugation. Between respectively step the plate is typically washed next to a mild detergent solution to remove any proteins or antibodies that are not specifically bound. After the final wash step the plate is developed by adding up an enzymatic substrate to produce a visible signal, which indicates the sum of antigen in the example. Older ELISAs utilize chromogenic substrates, though newer assays employ fluorogenic substrates near much higher sensitivity.
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