When calcium carbonate separates out from solutions, it has at first a gelatinous appearance, which leads to the supposition that this salt appears in a colloidal state.
The term “Collosol” appears to be a group designation for what are claimed to be permanent colloidal solutions, marketed by the Anglo-French Drug Co.
The following report was submitted and its adoption by the Council recommended by the committee: “Collosol Cocaine” is said to be a colloidal form of cocain and is alleged to possess a remarkably low toxicity.
Of the other metals in colloidal form, chiefly silver and copper have come into use.
Chemical Laboratory with the request that the tablets be examined to determine whether or not they contained, as claimed, selenium in colloidal form.
Colloidal solutions of the metals are certainly subject to precipitation and other changes on entering the blood.
Certain results reported from the American Medical Association’s Chemical Laboratory suggest that the so-called “colloidal iodin” of Iodeol may be a combination of iodin with a volatile oil.
In the same way it is probable, as has been pointed out by Wells, that metals when introduced in crystalloid form may rapidly be altered so that they are carried throughout the body in colloidal form.
The majority of those who have worked with selenium have used it in colloidal form, either preparing it themselves or employing one of the preparations put on the market by the pharmaceutic firms.
Numerous compounds of selenium, some of them claiming to circulate in colloidal form, have been described, and have been put on the market for use in malignant disease.
All of these considerations indicate how unjustifiable is the assumption that colloidal metals exercise a peculiar action on growing tumors.
I have recently examined the effects of colloidal copper on malignant tumors in man, and have been unable to find that it has any therapeutic value.
For the latter assumption there is absolutely no evidence; it is due simply to the influence of the colloidal theory.
Cocaine exists as the pure alkaloid in the Colloidal state--the condition in which it is isomorphic with the protein of the body fluids.
Barley water has something of a colloidal action upon the casein, causing the curds to be finer and less tough in character.
Some members of this group swell and become gelatinous in the presence of moisture and heat; some become of a colloidal form in water, and will pass through filter paper; others remain unchanged.
Since, however, it has the appearance, on being mixed with water, of being dissolved, it is called a colloidal solution.
An example of such is found in the proteids of the blood which, as a colloidal solution, pass through the capillary walls to become a part of the lymph.
In the distribution of colloidal preparations in the animal body by injection, Duhamel and Juillard(8) found that the liver contained the greatest amount.
The active ingredient of all of these materials is tannin, a colloidal or uncrystallisable substance.
It is colloidal and soluble with difficulty in water.
Unlike the "B" it is apparently not adsorbed by fine precipitates such as fullers' earth or colloidal iron.
It has a very large molecule, and is suspended in our atmosphere in colloidal form.
Although the material had been identified as a colloidal compound of a new, transuranic metal, no one had yet been able to determine its exact chemical structure nor involve it in any reaction that would break it down.
It would depend on the size of the colloidal particles, and on the frequency of the wave, wouldn't it?
The one represents mere crystallizable matter, the other the more complex colloidal or albuminoid substance, or that capable of producing a much greater number of aggregates.
The paper-making quality of the fibrous raw materials is also discussed, not merely from the point of view of the form and dimensions of the ultimate fibres, but their capacity for 'colloidal hydration.
These filtrates are in fact opalescent from the presence of a portion of nitrate in a colloidal (hydrated) form.
A large amount of experimental matter has been accumulated in view of the ultimate contribution of the results to the general theory of colloidal solutions.
To put the matter generally, in these colloidal and complex carbohydrates the ordinary physical criteria of molecular weight are wanting.
The action of the acid though selective is, of course, not exclusively confined to these colloidal carbohydrates.
Cellulose is distinguished by its inherent constructive functions, and these functions take effect in the plastic orcolloidal condition of the substance.
In this respect hydrocyanic acid behaves precisely as with many other enzymes and with colloidal platinum [Bredig, 1901].
The co-enzyme is partially removed from yeast-juice by means of a colloidal solution of ferric hydroxide (Resenscheck).
When in the colloidal state, their sensible properties are very different from those of the same substance when crystallized, or when in a state easily susceptible of crystallization.
A certain property of colloidal substances comes into play most opportunely in assisting diffusive preparations.
Opposed to the colloidal is the 'crystalline condition.
Then he gave an abstruse and highly technical account of a process by which in "solutions of colloidal ferric hydroxide, exposed to strong sunlight," compounds could be formed similar to those to be found in the green plant.
When a soluble substance in concentrated solution is immersed in a liquid which forms with it a colloidal precipitate, its surface becomes encased in a thin layer of precipitate which gradually forms an osmotic membrane round it.
They are, in fact, periodic precipitates of phosphate and carbonate of lime deposited in the colloidal organic substance of the mollusc.
This is probably the reason why the coagulum of a colloidalliquid usually presents a vacuolar or spongy structure.
For this purpose we add to the solution traces of some colloidal substance, such as gelatine or gum, so as to delay the crystallization.
I was able to assure him by return of post that the figure was the result of the crystallization of copper sulphate in a colloidal medium.
Crystallization of sodium chloride in a colloidal solution, giving a plant-like form.
This mobility in the constitution of the micellae appears to be one of the principal causes of the peculiar properties of colloidal solutions.
Our experiments show how readily such striped or ruled structures may be produced in a colloidal solution by the simple diffusion of salts such as are found in every living organism.
Colloids diffused in water are usually called colloidal solutions, but they are not true solutions.
There are moreover many properties common to colloidal solutions and suspensions of fine powders, such as kaolin, mastic, charcoal, or Indian ink.
Coagulation therefore would seem to be merely the colloidal precipitation of a salt of calcium.
Thus a mere trace of sulphuretted hydrogen or hydrocyanic acid will paralyse the action of a colloidal metal, just as it does that of a ferment.
He found that 1 atom-gramme of colloidal platinum gives a sensible catalytic effect when diluted with 70 million litres of water.
Vries, and myself, who all observed the regression of these membranes, which although colloidal at the beginning of the reaction speedily become friable.
Suppose, for instance, that the molecules of a colloidal solution are aggregated into groups of ten.
These properties clearly show how dependent is the colloidal state on small differences in the structure of two substances.
A similar effect, though of opposite nature from a tanning standpoint, is exhibited by sulphonates on certain colloidal dark coloured substances.
Most inorganic substances possess tanning properties when in the colloidal state, e.
This double effect is still more pronounced in the synthetic tannins which contain colloidal bodies of pronounced tanning intensity on the one hand, inorganic and organic salts on the other, which then act as described above.
When sulphonating and especially when condensing substances, black dyestuffs or very finely divided carbon in the colloidal state are often formed.
Herzog and Adler, by using Prussian blue, Neufuchsin, patent blue V, crystal violet, and colloidal gold.
Considering the very similar structure of these two tannins, such differences appear surprising, but an analogy may be readily found in the existence of colloidal solutions of tannin and the (nearly) identical pentagalloyl glucose.
Colloidal matter is intrinsically devoid of structure, and in the mass may be regarded as homogeneous; whereas crystalline matter in its proximate forms assumes definite and specific shapes which express a complex of internal stresses.
The vegetable fibre substances are celluloses and derivatives of celluloses, also typically colloidal bodies.
Richardson remarks, that in the case of the more complex and differently shielded organs of warm-blooded animals, it is next to impossible to thaw equally and simultaneously all the colloidal fluids.
In the pleasing language of the doctors, "it prevents the pectous change of colloidal matter, and so prevents rigor mortis, coagulation of blood, and solidification of nervous centres and cords.
The blood and the colloidal fluids remain in the aqueous condition when the body is exposed to cold at freezing-point.
It cannot be too emphatically stated that where "biotic" force is manifested, these colloidal or albuminous compounds are found.
The contents consist of a semi-fluid colloidal substance, lying in contact with the inner surface of the membrane, and, like it, closed on all sides.
Tabasheer would seem, from Brewster's experiments, to be a very intimate admixture of two and a half parts of air with one part of colloidal silica.
He thus arrived at a division of matter into colloidal and crystalloidal.
Matter in the colloidal state appears to be endowed with properties which are quite absent, or are hidden, when it is in the ordinary crystalloidal condition.
Let us suppose that this mixture contained sugar and gum; the crystalloidal sugar soon passed through the parchment paper, and was found in the water outside, but the colloidal gum remained in the dialyser.
This method of dialysis was applied by Graham to separate and obtain in the pure state many colloidal modifications of chemical compounds, such as aluminium and tin hydrates, etc.
He proved that a colloidal substance acts towards a crystalloid much as water does; that the crystalloid rapidly diffuses through the colloid, but that colloids are not themselves capable of diffusing through other colloids.
The eyeball is a structure of colloidal humors and membranes, and of nothing else.
Water passes freely through them, salts pass freely through them, but the constructive matter of the active parts that is colloidal does not pass; it is retained in them until it is chemically decomposed into the soluble type of matter.
A further action upon the blood, instituted by alcohol in excess, is upon the fibrine or the plastic colloidal matter.
It receives colloidalfood for its muscles: combustible food for its motion; water for the solution of its various parts; salt for constructive and other physical purposes.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "colloidal" in a variety of sentences. We hope that you will now be able to make sentences using this word.
