High Energy Phosphate Analysis

High energy phosphate analysis is the measurement of energy-rich phosphate compounds, including ATP, ADP, and phosphocreatine, to evaluate cellular energy metabolism. Depending on the method, samples are extracted and analyzed by chromatography or nuclear magnetic resonance, or ATP is quantified through a luciferase reaction in which ATP-dependent light production reflects its concentration. In medicine, these measurements help assess tissue ischemia, mitochondrial dysfunction, muscle disorders, and altered metabolism in disease. Comparing high-energy phosphate levels and ratios can reveal impaired energy production, disrupted phosphate transfer, or recovery after treatment, supporting research into diagnosis, disease mechanisms, and therapeutic responses.

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Education

JoVE Science Education - Engineering

Conservation of Energy Approach to System Analysis

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2023

Source: Ricardo Mejia-Alvarez and Hussam Hikmat Jabbar, Department of Mechanical Engineering, Michigan State University, East Lansing, MI The purpose of this experiment is to demonstrate the application of the energy conservation equation to determine the performance of a flow system. To this end, the energy equation for steady, incompressible flow is applied to a short pipe with a gate valve. The gate valve is then gradually closed and its influence on flow conditions is characterized. In...

Phosphate Buffer

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2024

The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base. Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...

Research

JoVE Journal - Chemistry
Free Sample

The Effect of Charging and Discharging Lithium Iron Phosphate-graphite Cells at Different Temperatures on Degradation

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Cited by 6 •

2018

This article describes the effect of dissimilar charging/discharging temperatures on the degradation of lithium iron phosphate-graphite pouch cells, aiming at simulating close to real case scenarios. In total, 10 temperature combinations are investigated in the range -20 to 30 °C in order to analyze the impact of temperature on degradation.

What is Energy?

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2020

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)...

Free Energy

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2019

Free energy—abbreviated as G for the scientist Gibbs who discovered it—is a measurement of useful energy that can be extracted from a reaction to do work. It is the energy in a chemical reaction that is available after entropy is accounted for. Reactions that take in energy are considered endergonic and reactions that release energy are exergonic. Plants carry out endergonic reactions by taking in sunlight and carbon dioxide to produce glucose and oxygen. Animals, in turn, break down the...

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