Filter Retardation Assay
Filter Retardation Assay - Related Videos
08:03
Protein-tRNA Agarose Gel Retardation Assays for the Analysis of the N6-threonylcarbamoyladenosine TcdA Function
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Cited by 4 •
2017
A protocol is presented for the production of tRNA(UUU) and the analysis of tRNA(UUU) in complex with the enzyme TcdA by agarose gel retardation assays.
01:19
Retarders
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2024
Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes. The function of retarders is to delay the setting of concrete, and this effect can be measured using a penetration test. The retardation process involves adding...
09:32
Evaluating the Effect of Coated Filters and Pre-Filters on the Infectivity and Concentration of Aerosolized Phi6 Virus
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2026
Here, we present a study to evaluate the anti-viral efficacy of copper- and silver-based surface coatings on air filters. Using a bioaerosol chamber and Phi6 bacteriophage, this method quantifies viral inactivation and mechanical filtration efficiency for self-sanitizing indoor air technologies.
01:27
Passive Filters
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2024
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources. Low-Pass Filters Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...
01:25
Active Filters
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2025
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is: Where Af is the gain at low frequencies also known as the dc gain, s is the...
FAQs
Retention depends on the nucleic acid being associated with protein when the mixture reaches the membrane. Protein-bound material is held by the membrane, whereas unbound DNA or RNA passes through. This separation converts complex formation into a measurable retained signal, allowing investigators to distinguish binding from free nucleic acid and evaluate molecular recognition experimentally.
Binding conditions can change how much complex forms before filtration. Researchers can vary cofactors or environmental factors, then compare the retained nucleic-acid signal across conditions. Mutations can be assessed in the same way. Greater or lower retention under matched comparisons provides evidence that a factor influences complex formation and supports relative, rather than necessarily absolute, affinity estimates.
Because free nucleic acid passes through while protein-associated material remains on the membrane, the retained signal represents the fraction captured in complexes under the tested conditions. Comparing signals between protein variants, nucleic-acid substrates, or assay conditions can reveal changes in binding behavior. Interpretation is comparative, as the assay is especially suited to estimating relative affinity.
In a typical workflow, researchers combine the protein and DNA or RNA, allow the mixture to form complexes, and pass it through a nitrocellulose or similar membrane. They then assess the nucleic-acid signal retained on the membrane. Comparing that signal with the amount that passes through provides a measure of complex formation for the tested sample.
At minimum, the setup requires a protein, a DNA or RNA substrate, and a nitrocellulose or similar membrane. It also requires a way to measure the nucleic-acid signal retained after filtration. These components connect the physical separation step with quantitative comparison of binding across proteins, substrates, cofactors, or environmental conditions.
Within Biological Techniques, the assay supports characterization of DNA- and RNA-binding proteins and investigation of molecular recognition. It can compare binding among protein forms, examine the effects of mutations, and test the influence of cofactors or environmental factors. The resulting retained-signal comparisons help researchers determine how these variables affect nucleic-acid complex formation.