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Resonance and Hybrid Structures

Resonance and Hybrid Structures

According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.

Sound Waves: Resonance

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...

Double Resonance Techniques: Overview

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

Resonance

Resonance

The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.

Concept of Resonance and its Characteristics

Concept of Resonance and its Characteristics

If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...

Parallel Resonance

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:

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Related Experiment Video

Updated: Jun 27, 2025

Förster Resonance Energy Transfer Measurements in Living Plant Cells

Förster Resonance Energy Transfer Measurements in Living Plant Cells

Published on: June 28, 2021

Appleseed - restoration and resonance.

Florian Maderspacher¹

¹Florian Maderspacher is Current Biology's Senior Reviews Editor.

Current Biology : CB

|May 7, 2024

Summary

River restoration is possible, even for heavily polluted waterways. Barrier removal is an increasingly popular method in global river revitalization efforts.

Area of Science:

Environmental Science
Ecology
Hydrology

Background:

Rivers worldwide face degradation due to pollution and artificial barriers.
Successful case studies demonstrate the feasibility of comprehensive river restoration.

Discussion:

The restoration of Europe's most polluted river proves ecological recovery is achievable.
Diverse strategies and objectives characterize current river restoration initiatives globally.

Key Insights:

River ecosystems possess inherent resilience and capacity for recovery.
Barrier removal is emerging as a key, effective technique in river restoration.

Outlook:

Future river restoration efforts can build upon successful models.

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Last Updated: Jun 27, 2025

Förster Resonance Energy Transfer Measurements in Living Plant Cells

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Continued focus on barrier removal will likely enhance river connectivity and health.