Chain Propagation
Chain Propagation - Related Videos
01:28
Electron Transport Chains
0 Views •
2019
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle. The ETC is comprised of...
01:07
Propagation of Waves
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2023
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free. Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
01:23
Propagation of Action Potentials
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2025
The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron. Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
05:22
Isolation and Propagation of Circulating Tumor Cells from a Mouse Cancer Model
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Cited by 8 •
2015
Circulating tumor cells (CTCs) have been shown to play an important role in tumor metastasis. Here, a method for the isolation and propagation of CTCs from the whole blood of a syngeneic mouse tumor model of hepatocellular carcinoma (HCC) metastasis is described.
07:28
Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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2015
A protocol for the high-throughput analysis of polymerization catalyst, chain transfer polymerizations, polyethylene characterization, and reaction kinetic analysis is presented.
FAQs
Reactivity continues because each propagation event converts one reactive intermediate into another rather than removing activity from the system. A radical may abstract an atom or add across a multiple bond, forming a new radical with sufficient reactivity to attack another stable molecule. Repetition of this exchange allows the chain reaction to proceed through successive cycles.
The reaction pathway depends on how the active intermediate interacts with the stable molecule. In atom abstraction, the intermediate removes an atom and leaves a new reactive species; in addition, it attaches to a multiple bond and generates a radical at a new position. These alternatives influence which products and subsequent propagation steps can form.
Regeneration allows many propagation events to follow the initial production of reactive species, so the reaction does not depend on consuming an equivalent amount of initiator for every molecular transformation. The balance between repeated propagation and chain termination helps determine how long reaction activity persists and affects product formation, reaction rates, and polymer molecular weight.
Analysis begins by identifying the reactive intermediate, the stable molecule it attacks, and the product intermediate formed after that reaction. Researchers can then follow whether the new intermediate repeats the same type of step, such as atom abstraction or addition. Mapping this cycle clarifies reaction kinetics, product pathways, and the factors that sustain activity.
In polymer chemistry, propagation is examined as a sequence of radical additions to monomer molecules. Each addition extends a growing polymer chain and creates the reactive site needed for another addition. Tracking these repeated events helps relate propagation behavior to chain growth, molecular weight, reaction rate, and the eventual influence of chain termination.
The same repeating logic provides a framework for interpreting more than polymerization. Chain propagation helps explain how reaction activity develops in combustion and how photochemical reaction kinetics can proceed through successive reactive intermediates. Comparing these settings shows how propagation connects intermediate regeneration with reaction rates and product formation across different areas of chemistry.