This laminarcoagulation by constant additions gradually fills the aneurysmal cavity and the pulsation in the sac then ceases; contraction of the sac and its contents gradually takes place and the aneurysm is cured.
I think the rarity of the last sign must have been due to the early coagulation of the blood, and its retention by the pleura, as I saw well-marked gravitation ecchymosis in one or two cases of mediastinal hæmorrhage.
The small tendency to formation of adhesions in uncomplicated cases probably depended on the coagulation of a layer of blood over the whole internal lining of the joint.
I think this was usually checked by early coagulation of the blood, and later by adhesions.
A hæmatoma resulted in connection with the wounded vessel, the general tendency in the effusion being to coagulation at the margins and subsequent contraction.
The coagulation of the blood is also affected by the same agent, that is, it coagulates very much more rapidly.
Coagulation is also hastened by heightened emotion; a wound does not bleed so freely when the wounded one is angry or excited.
In the intravascular coagulationexperiments above described, all the rabbits were carefully weighed, and the amount of nucleoproteid injected until coagulation occurred was measured.
Fibrinogen is insoluble in water, but soluble in salt solutions; it has three different coagulation temperatures, 56 deg.
Moreover, it was found that all the failures of coagulation occurred when the nucleo-proteid used was obtained from pigmented animals.
Pickering showed that the three synthesized colloids of Grimaux in the same way produced coagulation in pigmented animals, but failed to do so in albinoes.
The temperature of coagulation (usually about 72 deg.
The coagulation temperature of albumin and the coagulation by other organic substances are similarly influenced by the lyotrope series.
This surface coagulation is not sufficient to prevent the free access of the oxygen of the surrounding air.
Thus, in 1761, off Belleisle, the conditions of the coagulation of the blood were among the subjects of his inquiries.
The curling in of the inner and middle coats retards the escaping stream and facilitates coagulation within the cut end of the vessel now formed by the outer coat alone.
The solid portion resulting from the coagulation of blood.
The area of coagulation necrosis becomes filled with white blood cells, and the dry necrosed part is liquefied by the cocci.
They are poorly supplied with blood vessels and undergo coagulation necrosis, but do not tend to suppurate until infected.
The coagulation of milk is also a calcium salt precipitation.
There is a most remarkable analogy between the phenomena of coagulation as seen in living beings and the phenomena which occur when the liquid in the interior of an osmotic growth comes into contact with the mother liquor.
Such a pseudo-solution of a colloid is called a "sol," while a colloid in a state of coagulation is called a "gel.
These particles in suspension are precipitated by solutions of electrolytes in a manner similar to the coagulation of colloids.
Colloids in a state of coagulation have a vacuolar or sponge-like structure.
It is by the study of coagulation in liquids less complex than blood that we may hope to elucidate the mechanism of the process, {155} which is simply a physico-chemical phenomenon exactly analogous to gelatinous precipitation.
Coagulation therefore would seem to be merely the colloidal precipitation of a salt of calcium.
Iron-Chloride Solution: to cause coagulation on injection into sac.
The induration results from coagulation and partial organisation of the inflammatory effusion, and prevents the necessary contraction of the sore.
Coagulation and breaking completed, the second heating was effected by dipping the whey from the curd into the can already mentioned, and heated to a temperature of 140 deg.
If colouring matter is used, it should be added fifteen to twenty minutes before the rennet, so as to become thoroughly mingled with the milk before coagulation takes place.
In special cases the alkalinity and the rapidity of coagulation may be ascertained, or the blood may be examined bacteriologically.
It is due to the formation of myosin by the coagulation of the contents of the individual muscle fibers.
A white, albuminous, fibrous substance, formed in the coagulation of the blood either by decomposition of fibrinogen, or from the union of fibrinogen and paraglobulin which exist separately in the blood.
A semisolid mass or clot, especially that formed in coagulation of the blood.
Briefly these consist of noting the acceleration of coagulation time in a mixture of equal parts of serum and the thromboplastic agent to which about an equal part of oxalate plasma is added.
The process is exactly similar to the coagulationnecrosis described in the case of tubercles by Weigert.
Hirschfelder reported to the Council that of a number of specimens of Coagulen-Ciba examined by him, failed to accelerate the coagulation time of blood.
No acceleration ofcoagulation in vitro was observed even with the highest concentrations tried, namely 25 and 50 per cent.
Coagulen did not accelerate the coagulation time of blood and oxalate plasmas in the majority of tests any more than the controls of saline, while 0.
Among these is a substance which in a certain degree of concentration kills or so alters living protoplasm that it passes into a condition that Weigert describes ascoagulation necrosis.
Agitation of the milk should be kept up for at least 15 minutes, where coagulation begins in 20 minutes, or as long as it can be and not prevent a solid coagulation.
Footnote: In the case of the lower animals, which have no means of stopping hemorrhages as we have, the coagulation is generally still more rapid.
The coagulation soon checks all ordinary cases of bleeding.
The thick, curdy precipitate formed by thecoagulation of albuminous matter; any mass of coagulated matter, as a clot of blood.
Coagulation is generally the change of an albuminous body into an insoluble modification.
Further, Politzer found that all of the albumoses either delayed or prevented altogether the coagulation of the blood, in conformity with the observations of Schmidt-Mülheim and Fano.
It is further very suggestive that the destruction of these enzymes by heat happens to occur at approximately those temperatures which are generally recognized as the coagulation points of ordinary proteids.
Heteroalbumose, however, was constantly most active, especially in delaying the coagulation of the blood.
The purpose of this irritating fluid may be, as Reaumur suggested, to prevent the coagulation of the blood and thus not only to cause it to flow freely when the insect bites but to prevent its rapid coagulation in the stomach.
Like Nuttall, he failed to get satisfactory evidence that the secretion of the salivary glands retarded coagulation of the blood.
If coagulation were impossible, the {105} slightest injury in drawing blood would prove fatal.
In this law of the coagulation of the blood is our safeguard against death by haemorrhage, or against undue loss of blood.
Describe the process by which the coagulation of blood takes place?
Note that coagulation begins in all parts of the liquid at the same time and that, as the process goes on, the clot shrinks and is drawn toward the center.
Although coagulation affects all parts of the blood, only one of its constituents is found in reality to coagulate.
If compounds of calcium are absent from the blood, coagulation does not take place.
The purpose of the salts is to prevent coagulation until the blood is diluted with water as in the experiments which follow.
The rate at which coagulation takes place varies greatly under different conditions.
Another function ascribed to the white corpuscles is that of aiding in the coagulation of the blood (page 31); and still another, of aiding in the healing of wounds.
While all of the proteids probably serve as food for the cells, the fibrinogen, in addition, is a necessary factor in the coagulation of the blood (page 31).
Most difficult of all to answer have been the questions: What causes the blood to coagulate outside of the blood vessels and what prevents its coagulation inside of these vessels?
The purpose of coagulation is to check the flow of blood from wounds.
The water dilutes the salts so that coagulation is no longer prevented.
Jar the vessel occasionally as coagulation proceeds; and if the clot is slow in forming, add a trace of some salt of calcium (calcium chloride).
Fibrinogen coagulates more readily than the others and is the only one that changes in the ordinary coagulation of the blood.
In the plasma the fibrinogen is in a liquid form; but during coagulation it changes into a white, stringy solid, called fibrin.
Another substance which is necessary to the process of coagulation is the element calcium.
