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Related Concept Videos

Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
Biasing of FET01:22

Biasing of FET

Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...
Clipper Circuit01:18

Clipper Circuit

A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
Clamper Circuit01:14

Clamper Circuit

A clamper circuit, also known as a DC restorer, represents a specialized variant of the rectifier circuit, notable for its method of taking the output across the diode rather than the capacitor. This configuration lends to several distinctive applications, particularly in handling square wave inputs.
Within this circuit, the diode's orientation prompts the capacitor to charge up to the level of the most negative peak of the input signal. Upon reaching this state, the diode ceases to conduct,...
Basic Discrete Time Signals01:16

Basic Discrete Time Signals

The unit step sequence is defined as 1 for zero and positive values of the integer n. This sequence can be graphically displayed using a set of eight sample points, showing a step function starting from n=0 and remaining constant thereafter.
The unit impulse or sample sequence is mathematically expressed as zero for all n values except at n=0, where it is one. The unit impulse sequence, denoted by δ(n), is the first difference of the unit step sequence, while the unit step sequence u(n) is the...
Impedance Combination01:21

Impedance Combination

Consider a string of christmas lights, each bulb symbolizing an impedance element. In this series configuration, the flow of electric current remains uniform across every component. This behavior aligns with Kirchhoff's Voltage Law (KVL), which asserts that the total impedance in such a setup equals the sum of individual impedances—akin to resistors in series. It follows that the voltage from the power source is distributed proportionally among these components, adhering to the voltage division...

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Related Experiment Video

Updated: Jun 21, 2026

Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles
11:54

Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles

Published on: March 13, 2017

General FRET-based coding for application in multiplexing methods.

Letícia Giestas1, Vesselin Petrov, Pedro V Baptista

  • 1REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal.

Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology
|July 30, 2009
PubMed
Summary
This summary is machine-generated.

This study addresses "cross-talk" in Förster Resonance Energy Transfer (FRET) experiments. A new theoretical model helps accurately identify probe-target pairs in complex biological samples, overcoming signal interference.

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FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors
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FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors

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Genetic Barcoding with Fluorescent Proteins for Multiplexed Applications
13:14

Genetic Barcoding with Fluorescent Proteins for Multiplexed Applications

Published on: April 14, 2015

Related Experiment Videos

Last Updated: Jun 21, 2026

Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles
11:54

Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles

Published on: March 13, 2017

FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors
10:34

FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors

Published on: August 20, 2012

Genetic Barcoding with Fluorescent Proteins for Multiplexed Applications
13:14

Genetic Barcoding with Fluorescent Proteins for Multiplexed Applications

Published on: April 14, 2015

Area of Science:

  • Biophysics
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Förster Resonance Energy Transfer (FRET) is a powerful tool for studying molecular interactions and simultaneous events in biological samples.
  • A significant limitation in multiplexed FRET experiments is spectral "cross-talk" between different donor-acceptor pairs, hindering accurate signal interpretation.
  • Distinguishing specific probe-target hybridized pairs in complex samples with multiple FRET pairs remains challenging.

Purpose of the Study:

  • To improve the understanding of "cross-talk" phenomena in FRET experiments involving multiple simultaneous events.
  • To develop a method for the unequivocal identification of specific probe-target hybridized pairs in multiplexed FRET assays.
  • To resolve sample composition ambiguities caused by spectral overlap and cross-excitation in FRET.

Main Methods:

  • Utilized oligonucleotide probes labeled with spectrally distinct fluorescent dyes.
  • Employed target oligonucleotides tagged with specific fluorescent dyes for FRET-based detection.
  • Developed and applied a theoretical model to analyze fluorescence signals from samples with three donors and multiple FRET pairs.

Main Results:

  • Identified that only 20% of donor/acceptor combinations in a three-donor system yield straightforward, interpretable FRET signals.
  • Demonstrated that severe cross-excitation in the remaining cases prevents direct identification of sample composition.
  • The developed theoretical model successfully enabled unequivocal attribution of sample composition to fluorescence signals, even with significant cross-talk.

Conclusions:

  • Multiplexed FRET experiments with multiple donors are prone to significant spectral "cross-talk" and cross-excitation.
  • A theoretical modeling approach is essential for accurate interpretation of complex FRET data in such systems.
  • This work provides a robust method for resolving sample identity in intricate FRET assays, enhancing their diagnostic and analytical capabilities.