Where this takes place, the catalytic velocity ( rate of reaction ) of the enzyme may be significantly faster than that of others.

The speed at which a reactions takes place is studied by reaction kinetics.

This reaction takes place almost exclusively in aromatic hydrocarbons, where it is called electrophilic aromatic substitution.

This process usually takes the form of a chain reaction, for example in the reaction of alkanes with halogens.

It was found that the reaction of chymotrypsin with its substrate takes place in two stages, an initial “ burst ” phase at the beginning of the reaction and a steady-state phase following Michaelis-Menten kinetics.

Oxidation and reduction describe the change of oxidation state that takes place in the atoms, ions or molecules involved in an electrochemical reaction.

Iron corrosion takes place on acid medium ; H < sup >+</ sup > ions come from reaction between carbon dioxide in the atmosphere and water, forming carbonic acid.

However, electrolysis requires an external source of electrical energy to induce a chemical reaction, and this process takes place in a compartment called an electrolytic cell.

Von Trier has stated he was inspired to make a trilogy about the United States as a reaction to Americans at the Cannes film festival who said he had no right to make the Dancer in the Dark, which was often viewed as being critical of a country he has never been to ( and has no intention of ever visiting, due to his phobia of travel ); however, von Trier himself has stated in interviews he did not intend it to be a criticism of America, saying the film takes place in a " fictional America ".

It is an exothermic reaction which can release large amounts of energy both as electromagnetic radiation and as kinetic energy of the fragments ( heating the bulk material where fission takes place ).

The cyclic reaction takes place only at photosystem I.

** Organic redox reaction, a redox reaction that takes place with organic compounds

In this example, which reaction takes place is controlled in part by the relative concentrations of the reactants.

When this happens the solution comes into contact with air and another chemical reaction takes place.

In many cases, a water molecule is removed after the addition takes place ; in this case, the reaction is classed as an addition-elimination or addition-condensation reaction.

When the reaction is exothermic ( ΔH is negative, puts energy out ), we include heat as a product, and, when the reaction is endothermic ( ΔH is positive, takes energy in ), we include it as a reactant.

When all of the details are worked out one ends up with an expression that again takes the form of an Arrhenius exponential multiplied by a slowly varying function of T. The precise form of the temperature dependence depends upon the reaction, and can be calculated using formulas from statistical mechanics involving the partition functions of the reactants and of the activated complex.

Ink is exposed to UV radiation where a chemical reaction takes place where the photo-initiators cause the ink components to cross-link into a solid.

The Absurd in these plays takes the form of man ’ s reaction to a world apparently without meaning, and / or man as a puppet controlled or menaced by invisible outside forces.

Catalysts are substances which change the pathway ( mechanism ) of a reaction which in turn increases the speed of a reaction by lowering the activation energy needed for the reaction to take place.

With a catalyst, a reaction which is kinetically inhibited by a high activation energy can take place in circumvention of this activation energy.

A chain reaction is a sequence of reactions where a reactive product or by-product causes additional reactions to take place.

" Indeed, ELIZA's code had not been designed to evoke this reaction in the first place.

The burning of gunpowder does not take place as a single reaction, however, and the byproducts are not easily predicted.

Although some form of reaction may take place, it is not necessary ; the method may work by attractive charges, for example, if the target particles are positively charged, use a negatively charged substrate.

When one reactant contains hydrogen atoms, a reaction can take place by exchanging protons in acid-base chemistry.

Volkov had insisted that all written communications about him take place by diplomatic bag rather than by telegraph, causing a delay in reaction that might plausibly have given the Soviets time to uncover his plans.

The same reaction can take place between carbons 1 and 5 to form a molecule with a 6-membered ring, called glucopyranose.

If enough nuclear fuel is assembled in one place, or if the escaping neutrons are sufficiently contained, then these freshly emitted neutrons outnumber the neutrons that escape from the assembly, and a sustained nuclear chain reaction will take place.

Long before all possible fission has taken place, the buildup of long-lived neutron absorbing fission byproducts impedes the chain reaction.

* propagation ( may comprise several elementary steps, as, for instance, reaction elementary acts, where the active particle through reaction forms another active particle which continues the reaction chain by entering the next elementary step ); particular cases are:

:: * chain transfer ( the case in which one active particle enters an elementary reaction with the inactive particle which as a result becomes another active particle along with forming of another inactive particle from the initial active one );

Two zinc ions that are needed for the enzyme to catalyze its reaction are shown as purple spheres, and an enzyme inhibitor called S-hexylglutathione is shown as a space-filling model, filling the two active sites.

Only the active state of the GTPase can transduce a signal to a reaction chain.

The rapid reaction forces represent the main active combat capability of the military and consist of the 1st Brigade, 2nd Brigade and the Armour Battalion.

The active substances trigger chemical reactions in nerve endings, which heighten heart rate, alertness, and reaction time.

Horseradish peroxidase has an accessible active site, and many compounds can reach the site of the reaction.

Because tetrahydrofolate, the product of this reaction, is the active form of folate in humans, inhibition of DHFR can cause functional folate deficiency.

During the 1970s he was active in Demokratisk Allians ( DA ), which was a reaction to the communist demonstrations for a North Vietnamese invasion of South Vietnam.

Monomers are consumed early in the reaction ; the terminal functional groups remain active throughout and short chains combine to form longer chains.

In biology the active site is part of an enzyme where substrates bind and undergo a chemical reaction.

Residues that directly participate in the catalytic reaction mechanism are called active site residues.

Residues of the active site will act as donors or acceptors of protons or other groups on the substrate to facilitate the reaction.

In other words, the active site modifies the reaction mechanism in order to change the activation energy of the reaction.

The electrolyte may serve as a simple buffer for internal ion flow between the electrodes, as in lithium-ion and nickel-cadmium cells, or it may be an active participant in the electrochemical reaction, as in lead – acid cells.

The pathways are a series of reactions, in which a zymogen ( inactive enzyme precursor ) of a serine protease and its glycoprotein co-factor are activated to become active components that then catalyze the next reaction in the cascade, ultimately resulting in cross-linked fibrin.