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Allergic Reactions

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Reaction Mechanisms

Reaction Mechanisms

Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:

Determining Order of Reaction

Determining Order of Reaction

Rate laws describe the relationship between the rate of a chemical reaction and the concentration of its reactants. In a rate law, the rate constant k and the reaction orders are determined experimentally by observing how the rate of reaction changes as the concentrations of the reactants are changed. A common experimental approach to the determination of rate laws is the method of initial rates. This method involves measuring reaction rates for multiple experimental trials carried out using...

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The theoretical yield of a reaction is the amount of product estimated to form based on the stoichiometry of the balanced chemical equation. The theoretical yield assumes the complete conversion of the limiting reactant into the desired product. The amount of product that is obtained by performing the reaction is called the actual yield, and it may be less than or (very rarely) equal to the theoretical yield.

Reaction Rate

Reaction Rate

The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure.
The mathematical representation of the change in the concentration of reactants and products, over time, is the rate...

Reaction Quotient

Reaction Quotient

The status of a reversible reaction is conveniently assessed by evaluating its reaction quotient (Q). For a reversible reaction described by m A + n B ⇌ x C + y D, the reaction quotient is derived directly from the stoichiometry of the balanced equation as

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Treatment of Liver Metastases Using an Internal Target Volume Method for Stereotactic Body Radiotherapy

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radiotherapy-induced ID reaction.

Jidong Lian¹, George Dundas, Victor Tron

¹Department of Oncology, University of Alberta, Edmonton, Alberta, Canada.

American Journal of Clinical Oncology

|February 3, 2005

Summary

This summary is machine-generated.

Radiotherapy can cause a rare skin reaction called an id reaction (ID reaction). This case report details a generalized dermatitis identified as an id reaction following local radiotherapy.

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Area of Science:

Dermatology
Radiation Oncology

Background:

Published accounts of radiotherapy-induced id reactions are rare.
Id reactions are a hypersensitivity response to an infection or inflammation elsewhere in the body.

Observation:

A patient developed generalized dermatitis after receiving local radiotherapy.
The dermatitis was pathologically confirmed as an id reaction.

Findings:

This case represents a rare instance of a generalized id reaction following radiotherapy.
The findings highlight a potential, albeit uncommon, adverse effect of radiation therapy.

Implications:

Increased awareness of radiotherapy-induced id reactions is needed among clinicians.
Further research may elucidate the mechanisms and incidence of this phenomenon.