Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Energy

Energy

The universe is composed of matter in different forms, and all forms of matter contain energy. The different forms of energy on Earth originate from the Sun—the ultimate energy source. For instance, plants capture light energy from the Sun, and through the process of photosynthesis, convert it into chemical energy. This stored energy from plants can be harnessed in many ways. For example, eating plant products as food provides energy for our body to function, and burning wood or coal...

What is Energy?

What is Energy?

The universe is composed of matter in different forms, and all forms of matter contain energy. The different forms of energy on Earth originate from the Sun — the ultimate energy source. Plants capture light energy from the Sun, and, via the process of photosynthesis, convert it into chemical energy. This stored energy from plants can be harnessed in many ways. For example, eating plant products as food provides energy for our body to function, and burning wood or coal (fossilized plants)...

Vision

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.

Power and Energy

Power and Energy

The power and energy delivered to an element are subjects of great significance in the field of electrical engineering. It is a well-known fact that a 100-watt light bulb emits more light than a 60-watt one. Therefore, power and energy calculations play a crucial role in the analysis of electrical circuits.
Power, defined as the time rate of expending or absorbing energy, is quantified in units called watts (W). The relation between power and energy is mathematically given as

Energy to Drive Translocation

Energy to Drive Translocation

Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...

Light as Energy

Light as Energy

The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

CICATRIZATION OF WOUNDS : II. MATHEMATICAL EXPRESSION OF THE CURVE REPRESENTING CICATRIZATION.

The Journal of experimental medicine·2009

Same author

CICATRIZATION OF WOUNDS : III. THE RELATION BETWEEN THE AGE OF THE PATIENT, THE AREA OF THE WOUND, AND THE INDEX OF CICATRIZATION.

The Journal of experimental medicine·2009

Same author

CICATRIZATION OF WOUNDS : IV. MATHEMATICAL STUDY OF THE EXTRAPOLATION FORMULA AND OF THE CURVE OF CICATRIZATION.

The Journal of experimental medicine·2009

Same author

CICATRIZATION OF WOUNDS : IX. INFLUENCE ON THE HEALING OF WOUNDS OF VARIATIONS IN THE OSMOTIC TENSION OF THE DRESSING.

The Journal of experimental medicine·2009

Same author

CICATRIZATION OF WOUNDS : X. A GENERAL EQUATION FOR THE LAW OF CICATRIZATION OF SURFACE WOUNDS.

The Journal of experimental medicine·2009

Same author

CICATRIZATION OF WOUNDS : XI. LATENT PERIOD.

The Journal of experimental medicine·2009

Same journal

Conformational changes upon pore blocker removal reveal conductive states of TMEM16A.

The Journal of general physiology·2026

Same journal

On the mechanism of hypomagnesemia with treatment-resistant seizures caused by variants of the Na+,K+-ATPase α1 subunit (ATP1A1).

The Journal of general physiology·2026

Same journal

Label-free real-time imaging of mitochondrial matrix volume changes and permeability transition in living cells.

The Journal of general physiology·2026

Same journal

Differential regulation of β1-dependent voltage shifts and kinetic modulation by an extracellular glutamate in NaV1.6 VSDIV.

The Journal of general physiology·2026

Same journal

Mechanistic insights into DCPIB inhibition of VRAC: Electrostatic control and binding plasticity.

The Journal of general physiology·2026

Same journal

An epilepsy-associated KV3.1 potassium channel variant acts via dominant-positive effect.

The Journal of general physiology·2026

See all related articles

Search research articles

Related Experiment Video

Updated: Jun 19, 2026

Measurement of Energy Metabolism in Explanted Retinal Tissue Using Extracellular Flux Analysis

Measurement of Energy Metabolism in Explanted Retinal Tissue Using Extracellular Flux Analysis

Published on: January 7, 2019

ENERGY AND VISION.

¹Laboratories of The Rockefeller Institute for Medical Research.

The Journal of General Physiology

|October 30, 2009

Summary

This summary is machine-generated.

This study presents a novel method for measuring the minimum visible light across the spectrum, offering results comparable to historical data. Refinements in methodology led to improved consistency in spectral sensitivity measurements.

More Related Videos

Vision Training Methods for Sports Concussion Mitigation and Management

Vision Training Methods for Sports Concussion Mitigation and Management

Published on: May 5, 2015

Using Looming Visual Stimuli to Evaluate Mouse Vision

Using Looming Visual Stimuli to Evaluate Mouse Vision

Published on: June 13, 2019

Related Experiment Videos

Last Updated: Jun 19, 2026

Measurement of Energy Metabolism in Explanted Retinal Tissue Using Extracellular Flux Analysis

Measurement of Energy Metabolism in Explanted Retinal Tissue Using Extracellular Flux Analysis

Published on: January 7, 2019

Vision Training Methods for Sports Concussion Mitigation and Management

Vision Training Methods for Sports Concussion Mitigation and Management

Published on: May 5, 2015

Using Looming Visual Stimuli to Evaluate Mouse Vision

Using Looming Visual Stimuli to Evaluate Mouse Vision

Published on: June 13, 2019

Area of Science:

Photometry
Spectroscopy
Human Vision

Background:

Historical methods for measuring the minimum visible spectrum, such as Langley's 1888 study, provide a baseline for comparison.
Variations in atmospheric conditions and solar radiation intensity can affect the accuracy of spectral sensitivity measurements.
Previous experiments often used diffused reflected light and considered solar radiation through Earth's atmosphere, introducing potential variables.

Purpose of the Study:

To develop and validate a new method for measuring the minimum visible light across different spectral regions.
To compare the results obtained with the new method against established historical data.
To identify factors contributing to discrepancies between current and historical spectral sensitivity measurements.

Main Methods:

Devised a novel method for measuring the minimum visible light across the electromagnetic spectrum.
Utilized a rock salt prism for spectral dispersion.
Determined the minimum visible threshold using diffused transmitted light from a controlled radiation source.

Main Results:

The results generally agree with Langley's 1888 findings but show some discrepancies, particularly around 0.55 micrometers wavelength.
The new method demonstrated high consistency for measurements at a given wavelength due to a stable radiation source.
Discrepancies are partly attributed to differences in methodology, including prism type, light source (transmitted vs. reflected), and atmospheric/solar variations in historical experiments.

Conclusions:

The developed method provides reliable measurements of spectral sensitivity.
The study highlights the importance of a stable radiation source and controlled experimental conditions for accurate spectral sensitivity measurements.
Methodological differences, including the use of transmitted versus reflected light and accounting for atmospheric effects, explain observed discrepancies with historical data.