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Related Concept Videos

Intracellular Signaling Cascades01:24

Intracellular Signaling Cascades

Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
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...
Signal and System01:26

Signal and System

A signal x(t) is a set of data or a time function representing a variable of interest. Signals typically convey information about a phenomenon, such as atmospheric temperature, humidity, human voice, television images, a dog's bark, or birdsongs. More generally, a signal can be a function of more than one independent variable. For instance, images depend on horizontal and vertical positions and can be regarded as two-dimensional signals. However, this text will focus on one-dimensional signals...
Classification of Signals01:30

Classification of Signals

In signal processing, signals are classified based on various characteristics: continuous-time versus discrete-time, periodic versus aperiodic, analog versus digital, and causal versus noncausal. Each category highlights distinct properties crucial for understanding and manipulating signals.
A continuous-time signal holds a value at every instant in time, representing information seamlessly. In contrast, a discrete-time signal holds values only at specific moments, often denoted as x(n), where...
Aliasing01:18

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original signal...

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Related Experiment Video

Updated: Jul 12, 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

Toll-like receptor signaling pathways.

Gregory M Barton1, Ruslan Medzhitov

  • 1Section of Immunobiology, Howard Hughes Medical Institute, Yale University School of Medicine, 300 Cedar Street, CABS660, New Haven, CT 06520, USA.

Science (New York, N.Y.)
|June 7, 2003
PubMed
Summary

Toll-like receptors (TLRs) are crucial for detecting microbial invaders and initiating immune responses. Understanding the complex signaling pathways activated by TLRs is vital for host defense research.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Toll-like receptors (TLRs) recognize conserved microbial structures, activating immune signaling pathways.
  • TLRs are essential for both innate and adaptive immunity, triggering responses like inflammation.
  • The intricate mechanisms and components of TLR-mediated immune responses are not fully understood.

Purpose of the Study:

  • To elucidate the complex signaling pathways activated by Toll-like receptors (TLRs).
  • To provide a clear overview of the known components and relations within the TLR signaling system.

Main Methods:

  • Review of existing literature on TLRs and their signaling pathways.
  • Utilizing resources like Science's Signal Transduction Knowledge Environment's TLR Connections Map.

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Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

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Last Updated: Jul 12, 2026

Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles
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Published on: March 13, 2017

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
09:36

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Main Results:

  • TLRs recognize microbial structures (e.g., LPS, dsRNA) and activate MyD88-dependent pathways.
  • Individual TLRs induce specific immune responses tailored to different pathogens.
  • A comprehensive map of TLR components and their interactions has been compiled.

Conclusions:

  • TLRs play a critical role in host defense against microbial infections.
  • Further research into TLR pathways is essential for understanding and manipulating immune responses.
  • The TLR Connections Map offers a valuable tool for navigating this complex biological system.