The protective case or shell of an infusorian or rotifer.
But it is a restriction which is associated with an advantage; the Infusorian cell, namely, has a firm exterior with a definite outline, instead of being soft and mobile all over.
This may seem to be a restriction, when we compare the Infusorian with Amoeba, which is apparently able to take in food at any part of the surface.
When there are no checks to prolific multiplication a single Infusorian may become, in the course of a week, the ancestor of several millions, and the same is true of a Bacterium within a day.
In the same way we may perhaps come to explain the more complex movements which the Infusorian makes with its vibratory cilia, which, moreover, are probably only fixed pseudopodia.
Defn: The protective case or shell of an infusorian or rotifer.
Now the single-celled Infusorian is in many respects comparable with the single-celled germ of the higher animals.
The Infusorian can be called potentially immortal, because of this method of reproduction.
But study of a one-celled animal, an Infusorian, for example, reveals that when it reaches a certain age it pinches in two, and each half becomes an Infusorian in all appearance identical with the original cell.
You see, it is almost exactly like the way in which the infusorian gets by obstacles with its touch, back, turn, and go ahead; except that where the plant grows the animal swims.
So the infusorian is a funny little machine, made so that when it hits anything it backs off, turns somewhat, and goes ahead again.
As soon as the infusorian feels uncomfortably warm, he stops, backs, turns, goes ahead.
In fact, the infusorian simply swallows whatever happens to hit his mouth.
So far as we can see, therefore, everything that the infusorian feels at all, feels to him exactly like everything else.
They are decidedly small animals, the largest of them no bigger than a pin head; and as I explained before, they are remarkable in that each infusorian is just one single cell.
Thus the plant, that seems to know two things, is twice as well off as the infusorian that knows only one.
If it happens to be only a grain of dust or a fleck of shell, down it goes just the same; the infusorian doesn’t know the difference.
If one is very clever with his fingers, as men who study creatures such as these have to be, one can take a slender needle and touch the infusorian on the front end—we cannot call it the head.
These little processes, which are called cilia, move to and fro with such rapidity that they are hardly visible; and, by means of them the little infusorian is enabled to move about in its watery home with considerable speed.
The observations of Nussbaum and those who repeated his experiments showed that although two different structures are required, not the whole mass of an infusorian is needed to maintain its life.
Maupas isolated an infusorian (Stylonichia pustulata), and observed its generations till March 1886.
In a year it would have the proud satisfaction of being the father of an Infusorian nation!
At the end of each branch is situated an infusorian (vorticella), and the whole colony represents in itself the genealogical family tree.
If an infusorian is injured by the loss of some part of its body, it may often recover its former integrity, but if the injury is too great it dies.
Thus the large Infusorian Tillina magna, described by Gruber, can be seen through the thin-walled cyst to retain the characteristic structure of its ectoplasm, and the whole of its organization.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "infusorian" in a variety of sentences. We hope that you will now be able to make sentences using this word.
