Stationary Bike

A stationary bike is an indoor exercise device that enables controlled cycling without forward movement, making it useful for fitness, rehabilitation, and human-performance research. Its pedals drive a flywheel or resistance system, while adjustable load and cadence determine the mechanical power produced by the rider; sensors can record variables such as heart rate, torque, and oxygen consumption. In bioengineering, stationary bikes support the study of biomechanics, cardiovascular responses, motor control, and energy expenditure under repeatable conditions. They also provide a practical platform for evaluating assistive technologies, designing rehabilitation programs, and developing personalized models of exercise performance.

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Research

JoVE Journal - Chemistry

Synthesis and Purification of Iodoaziridines Involving Quantitative Selection of the Optimal Stationary Phase for Chromatography

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Cited by 3 •

2014

A protocol for the diastereoselective one-pot preparation of cis-N-Ts-iodoaziridines is described. The generation of diiodomethyllithium, addition to N-Ts aldimines and cyclization of the amino gem-diiodide intermediate to iodoaziridines is demonstrated. Also included is a protocol to rapidly and quantitatively assess the most appropriate stationary phase for purification by chromatography.

Education

JoVE Core - Analytical Chemistry

Gas Chromatography: Types of Columns and Stationary Phases

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2024

Gas chromatography (GC) relies on stationary phases to separate and analyze components in a sample. There are two main types of stationary phases: liquid and solid. Liquid stationary phases are non-volatile, thermally stable, and chemically inert liquids coated onto the column. Solid stationary phases are particles of adsorbent material, such as silica gel or molecular sieves. For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...

Angular Momentum

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2023

Source: Nicholas Timmons, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Angular momentum is defined as the product of the moment of inertia and the angular velocity of the object. Like its linear analog, angular momentum is conserved, meaning that the total angular momentum of a system will not change if there are no external torques on the system. A torque is the rotational equivalent of a force. Because it is a...

Column Chromatography - Concepts

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2020

Column Chromatography Multiple techniques exist to purify and separate compounds in an organic chemistry laboratory. One of the most reliable separation techniques for microscale separations, where less than 10 grams of the compound is available for analysis, is column chromatography. This technique separates compounds in a mixture based on their physical properties, such as their solubility, polarity, hydrophobicity, size, and charge. Chromatography Basics The main components of any...

Research

JoVE Journal - Neuroscience
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A Simple Way to Measure Ethanol Sensitivity in Flies

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Cited by 33 •

2011

A simple assay to measure the sedating effects of ethanol on Drosophila flies, based on the loss of righting reflex, is described.

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