The material he had used as a catalytic agent was a new substance which he had read of in a scientific review, and he had purchased a small quantity of it in London.
Have you ever heard of a Catalytic process, Dorothy?
Hence it is hardly possible to interpret all catalytic processes on these lines.
On the other hand, the catalyticaction of certain inorganic and non-colloidal substances, such as the action of acids in accelerating the hydrolysis of carbohydrates, etc.
This view also makes the remarkable catalytic effects which take place in living protoplasm, which undoubtedly exists in the colloidal condition, much more easily understood.
Several theories concerning the mode of this catalytic action have been advanced.
Further, both trioxymethylene and formaldehyde itself can easily be condensed into hexoses, by simple treatment with lime water as a catalytic agent.
Enzymes perform their catalytic functions by reason of their colloidal form.
For the whole world of living things had been overtaken by the same tide of insensibility; in an hour, at the touch of this new gas in the comet, the shiver of catalytic change had passed about the globe.
The catalytic wave must have caught the place in full swing, in its nocturnal high fever, indeed in a quite exceptional state of fever, what with the comet and the war, and more particularly with the war.
While these enzymes are formed by the action of the body they can be separated from the body without losing theircatalytic efficiency.
Some of these catalytic agencies are specific in the sense that a given catalyzer can accelerate the reaction of only one step in a complicated chemical reaction.
We know that the comparatively great velocity of chemical reactions in a living organism is due to the presence of enzymes (ferments) or to catalytic agencies in general.
And finally, the same author showed that the oxidations in the sea-urchin egg are due to a catalyticprocess in which iron acts as a catalyzer.
Fermentations of this class are purely chemical reactions, in which the ferment acts as a simple catalytic agent.
In action they are catalytic and, mainly, hydrolytic.
The researches of Baker and others, showing that certain gas reactions, which ordinarily take place rapidly, proceed very slowly indeed if the gases are thoroughly dried, point to a catalytic action of small traces of moisture.
Rideal and Taylor class under catalytic action the effect of radiant energy in promoting such combinations as that of hydrogen and chlorine, although it is perhaps rather extending the usual conception of the term to do so.
Nutrition itself is but one great catalytic process.
We call this catalysis, catalytic action, the action of presence, or by what learned name we choose.
On Transformations produced byCatalytic Bodies: by Lyon Playfair, Esq.
Catalytic force, or attraction of surface concerned in the diffusive power of gases: an occult energy or power in saturated saline solutions; Prater.
Lyon Playfair[207] argues that the catalytic force is merely a modified form of chemical affinity, exerted under peculiar conditions.
The formation of a habit consists, therefore, in the production of a catalytic acceleration during the reaction.
Max Verworn has given us a very searching analysis of the molecular process in the catalytic aspect of metabolism in his Biogen Hypothesis (1903), "a critical and experimental study of the processes in living matter.
This special form of contact-action which we call fermentation is always effected by catalytic bodies of the albuminoid class, and, in fact, of the group of non-coagulable proteins which are known as peptones.
The most frequently employed means in this is probably thecatalytic acceleration of the usable and the catalytic retardation of the useless reactions.
We may not only compare inorganic habit with organic adaptation, which we call habit or practice, but also with "imitation," which implies a catalytic transfer of habits to socially united living beings.
He took a puppy and by treating it with his catalytic drugs, made it grow to maturity, pass through its entire normal life span, and die of old age in six months.
Let us suppose that by means of some tonic, some catalytic drug, your rate of metabolism and also your rate of expenditure of energy has been increased six fold.
Vaccine matter is extremely liable to decomposition; and when heated, even by the warmth of the body, fermentation arises, and by catalytic action putrefaction results, forming a positive poison.
Whenever putrefactive fermentation begins with any kind of meat, or any recently living nitrogenized substance, catalytic action takes place, ammonia is evolved, and the product is no longer pleasant to the taste or nutritious to the system.
This is the catalyticeffect of a vibration, a wave motion.
You're all familiar with the catalytic effects of light.
Other catalytic agents have been recommended from time to time, including strontianite, lead oxide, caustic baryta, aluminium hydrate, but none of these is of any practical importance.
He found that when equal weights of phenol and formaldehyde were mixed and warmed in the presence of an alkaline catalytic agent the solution separated into two layers, the upper aqueous and the lower a resinous precipitate.
Even the catalyticproperties of ferments are above the "ordinary" physical and chemical forces.
Starting from this basis, he analyses and rejects the explanations which have been offered in terms of the analogy of ferments, enzymes, or catalytic processes.
Substances which hasten very slow reactions in this way are said to act as catalytic agents or catalyzers, and the action is called catalysis.
On the other hand, the catalytic agent sometimes retards chemical action.
Platinum is remarkable for its property of acting as a catalytic agent in a large number of chemical reactions, and mention has been made of this use of the metal in connection with the manufacture of sulphuric acid.
It is probable that many of the chemical transformations in physiological processes, such as digestion, are assisted by certain substances acting as catalytic agents.
The catalytic action seems to be in part connected with the property of absorbing gases and rendering them nascent.
Oxygen and hydrogen combine with each other at ordinary temperatures in the presence of platinum powder, while if no catalytic agent is present they do not combine in appreciable quantities until a rather high temperature is reached.
The reactions are quite involved, but the conversion of water, sulphur dioxide, and oxygen into sulphuric acid is accomplished by the catalytic action of oxides of nitrogen.
Many reactions are brought about by the catalytic action of traces of water.
Sulphuric ether, common anæsthetic ether; -- so called because made by thecatalytic action of sulphuric acid on alcohol.
It appears to be the active catalytic agent in the process of etherification.
A familiar instance of a catalytic action is witnessed when a mixture of potassium chlorate and manganese dioxide is heated to 350 deg.
In organic chemistry many catalytic actions are met with.
Bredig has studied the catalytic decomposition of hydrogen peroxide by metallic colloids prepared by his electric method.
I shall show later on that gelatine and albumen essentially modify the precipitate and do not merely act as catalytic substances.
There is a pause of one or more seconds, and then the catalytic action begins afresh, commencing at the edges of the mirror.
In nature this reduction is accomplished by the radiant energy of the sun, by the agency of the catalytic action of chlorophyll.
Fermentation by means of a soluble ferment or diastase, a phenomenon which may almost be called vital, is also a catalytic action.
He found that 1 atom-gramme of colloidal platinum gives a sensible catalytic effect when diluted with 70 million litres of water.
Caustic soda and other chemical substances inhibit the catalytic action of colloidal platinum in the same way as they inhibit the fermenting action of diastase.
We may even obtain a curve giving an automatic record of the periodicity of this catalytic action.
The catalytic process may, however, be set going at once by adding a trace of potassium acetate to the solution.
This conception brings life into line with other catalytic actions, and shows us a living being as a store of potential energy, to be set free by an external stimulus which may also excite sensation.
These substances, which are often metals in a very fine state of subdivision, are called catalyticor contact agents.
This property is also shown by many inorganic substances which are spoken of as "catalytic agents" or "catalyzers" so that enzymes are sometimes called "organic catalyzers.
The function of catalytic agents seems to be to hasten the rate of a reaction which would occur spontaneously, though in a great many cases with extreme slowness.
In order to determine the position of the natural melting point, it was necessary, on account of the slowness of transformation, to employ a catalytic agent in order to increase the velocity with which the equilibrium was established.
In the case of such substances, also, the action of catalytic agents in producing isomeric transformation (racemisation) is well known.
Lastly, the presence of small quantities of different substances--catalytic agents or catalyzers--has a great influence on the velocity of transformation.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "catalytic" in a variety of sentences. We hope that you will now be able to make sentences using this word.
