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Related Concept Videos

Equivalent Capacitance01:19

Equivalent Capacitance

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From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
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Equivalent Capacitance01:19

Equivalent Capacitance

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Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
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Capacitors and Capacitance01:18

Capacitors and Capacitance

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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
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Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
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Capacitance: Single-Phase And Three-Phase Line01:25

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In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
Single-Phase Lines
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Base Excision Repair01:54

Base Excision Repair

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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
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Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor
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Phage-based capacitive biosensor for Salmonella detection.

Saroh Niyomdecha1, Warakorn Limbut2, Apon Numnuam1

  • 1Trace Analysis and Biosensor Research Center, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand; Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand; Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand.

Talanta
|July 22, 2018
PubMed
Summary

This study developed a novel biosensor for detecting Salmonella spp. using M13 bacteriophage in a capacitive system, offering rapid and reproducible results for food safety applications.

Keywords:
Capacitive biosensorM13 bacteriophagePathogenic bacteriaPolytyramineSalmonella spp.

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Area of Science:

  • Biosensor technology
  • Food microbiology
  • Analytical chemistry

Background:

  • Salmonella spp. pose a significant threat to public health, necessitating rapid and accurate detection methods.
  • Conventional methods for Salmonella detection can be time-consuming and labor-intensive.
  • Bacteriophage-based biosensors offer a promising alternative for specific and sensitive pathogen detection.

Purpose of the Study:

  • To develop and validate a capacitive biosensor for the detection of Salmonella spp.
  • To immobilize M13 bacteriophage onto a polytyramine/gold surface for Salmonella recognition.
  • To evaluate the performance of the biosensor in terms of sensitivity, reproducibility, and application to real samples.

Main Methods:

  • Immobilization of Salmonella-specific M13 bacteriophage on a polytyramine/gold electrode using glutaraldehyde.
  • Detection of Salmonella spp. via capacitive measurements in a flow injection system.
  • Regeneration of the sensing surface using an alkaline solution for reusability.
  • Analysis of raw chicken meat samples to assess recovery rates.

Main Results:

  • The M13 bacteriophage modified electrode demonstrated specific binding to Salmonella spp.
  • The capacitive biosensor exhibited good reproducibility (RSD of 1.1%) and a wide linear range (2.0 × 10^2 to 1.0 × 10^7 cfu mL^-1).
  • A low detection limit of 200 cfu mL^-1 was achieved, with analysis completed within 40 minutes.
  • The biosensor showed good recoveries (100-111%) when applied to raw chicken meat samples.

Conclusions:

  • The developed M13 bacteriophage-based capacitive biosensor is effective for the rapid and sensitive detection of Salmonella spp.
  • The biosensor's reusability and application to real samples highlight its potential for food safety monitoring.
  • This approach offers a new avenue for detecting pathogenic bacteria using bacteriophages.