If caffein were taken in a highly concentrated form, it would result in a narcotic habit quite as enslaving as the use of opium or cocain.
In addition to the evil effects caused by the caffein which it contains, tea is more destructive to the normal activities of the stomach because of the tannic acid.
The effect of the caffein is that of a nervous stimulant, increasing the general nervous and mental activity.
This action on the kidney contraindicates the use of caffein in any form, except in rare instances, when there is acute or chronic nephritis.
The increased blood pressure caused by caffein also contraindicates its use when there is hypertension.
Caffein may be used as a drug as well as given in coffee and tea.
It is a crime to present caffein as a soda fountain beverage to children and young persons when the excitement of the age is such as already to overstimulate all nervous systems and all hearts.
Other preparations of caffein may be selected if desired, or a soluble preparation may be given hypodermically.
If digitalis is administered, it will act as a diuretic; if caffein is deemed advisable, that will act as a diuretic.
Many patients cannot sleep for many hours after they have taken coffee or tea, as the cerebral stimulation of caffein is projected for hours after its ingestion.
The most frequent form of caffein used is the citrated caffein.
Coffee or caffein often causes these hearts to become irritable; it certainly raises the blood pressure, and therefore is not generally advisable.
Therefore when a heart has serious lesions, whether of the myocardium or of the valves, with compensation only sufficient, the action of caffein in any form is contraindicated.
Now one can have his choice, for the caffein is extracted for use in certain popular cold drinks and the rest of the bean sold as caffein-free coffee.
Other people liked the warmth and flavor of coffee but find that caffein does not agree with them.
Caffein acts as a mild stimulant both to the nervous system and brain, and to the heart; as is shown by the way in which tea or coffee will wake us up or refresh us when tired, or, if drunk too late at night, keep us from going to sleep.
Though the flavors of tea, coffee, and cocoa are so different, they all depend for their effect upon a spicy-tasting substance, called caffein from its having been first separated out of coffee.
The caffein of tea is sometimes called thein, and that of cocoa theobromin; but they are all practically the same substance.
The caffein or theine in tea is an alkaloid that has characteristic physiological properties.
When the physician wishes to prescribe such a mixture he may combine 1 grain of caffein or 2 grains of citrated caffeinwith 3 grains of acetanilid or 4 grains of acetphenetidin in a powder or capsule.
Certain forms of headache yield more readily to a mixture of caffein and acetanilid or caffein and acetphenetidin than to either acetanilid or acetphenetidin alone.
As taken, Alkalithia, therefore, represents caffein in a solution of alkali tartrate, citrate and bicarbonate containing free carbonic acid.
It will be observed that all the members of this series were young rabbits and, as will be shown later, young animals of other species are likewise more resistant tocaffein than adult animals.
Observations with caffein were also made on the human subject.
He determined the minimum toxic and lethal doses of caffein hydrobromid which he employed in 1 to 2 per cent solutions.
It would seem, therefore, that caffein is not cumulative.
Caffein was given chiefly by mouth, but the subcutaneous method was also employed during a portion of the experimental period in some dogs.
As the dog lost 10 per cent of his weight he was put on a meat diet exclusively and the dose of caffein was reduced to 0.
Caffein applied directly to muscle fiber causes tetanus and destroys muscular contractility, while a nerve fiber similarly treated loses its irritability.
In the two experiments of this series the rate of injection as a possible factor influencing the toxicity of caffein was tested.
Migrainin, one circular stating that “Migrainin is phenozon-caffein citrate,” etc.
Caffein Camphor Rheum This seems very open and above board, except as to quantities, until one tries to find out what “latalia rad.
Kola contains a very small percentage each of caffein and theobromin.
Qualitative tests demonstrated the presence of sodium, a carbonate, caffein and acetanilid, the latter in considerable quantities.
Caffein Camphor Rheum Two things about this are worth noting: One is that the name of the ingredient on which the manufacturer lays so much stress--latalia rad.
Attention is also directed to the fact that while bismuth andcaffein are mentioned as ingredients tests made in the laboratory failed to discover either of these substances.
American agents for Migrainin (Meister Lucius & Bruning) asserted that this preparation was a mixture of antipyrin 85 parts, caffein 9 parts and citric acid 6 parts.
Besides pyramidon, the chloroform soluble matter contained a small quantity of caffein and may have contained small amounts of other substances.
This will, no doubt, lead physicians to infer that Migrainin is not a mixture of antipyrin and caffein citrate, but that it is some new compound.
By employing the same methods as were used before (the usual tests for detecting caffein and bismuth), neither caffein nor bismuth could be demonstrated.
Qualitative tests indicated the presence of traces of phosphates, sulphates, reducing sugars, caffein and cinchona alkaloids.
Accordingly, enteronol was examined chemically to verify the statements on the label regarding the presence of caffeinand bismuth in the tablets.
Fredericq[261] states that caffein increases the irritability of the cardiac vagus and accelerates the appearance of pseudofatigue of the vagus which is produced by prolonged stimulation of the nerve.
However, the fact that a small percentage can be extracted from the green bean in this manner indicates that some of the caffein content exists therein in a free state.
However, chemists have not yet been able to expel all the caffein in treating coffee commercially, the best efforts resulting in from 0.
Hollingworth's[285] deductions, caffein is the only known stimulant that quickens the functions of the human body without a subsequent period of depression.
There is something more to coffee than its caffein stimulus, its action on the taste-buds of the tongue and mouth.
And, again, the caffein content of the brew, as will be seen, tends to counteract any possible desultory effects of the caffeol.
He can buy it already ground, or he can have it in the form of a soluble powder; he can even get it with the caffein element ninety-nine percent removed.
The presence of caffein in the sublimate is verified by observing its melting point, determined on a special heating stage used in connection with a microscope.
Elimination and toxicity of caffein in nephrectomized rabbits.
This would materially retard the absorption of the caffein by the body, spread the action over a longer period of time, and hence decrease the maximum stimulation attained.
In 1892, the French minister of war directed that, in the army roasting and grinding operations, the coffee chaff should no longer be thrown away, as it had been found that it was rich in caffein and aroma constituents.
Caffein is well known as a specific for nervous headaches, and as a heart stimulant and diuretic.
The presence of theobromine is peculiar to cocoa, but caffein is a stimulating principle which also occurs in tea and coffee.
Correspondingly the speed of performance in typewriting is heightened by small doses of caffein and retarded by larger doses.
An excellent investigation of this caffein effect on various psychological and psychomotor functions has recently been completed.
A complex test in coördination indicated that the effect of small, amounts of caffein is a stimulation and that of large amounts a retardation.
Hollingworth: The Influence of Caffein on Mental and Motor Efficiency.
When thecaffein effect on tapping movements was studied, it was found that it works as a stimulation, sometimes preceded by a slight initial retardation.
Caffein is not in any sense a food, but, as a stimulant, must be classed with tobacco, opium and other similar substances.
Later investigations have shown that caffein belongs to the vegetable poisons, and that its poisonous action is very strong.
It is true that caffein had been found in coffee and tea a few years before the revelation of 1833, but the physiological action of the drug was not known until many years afterwards.
Owing to its action on the heart and circulation, the body becomes heated, and in that sense a solution of caffein is a "hot drink.
A] While it is true that one cup of coffee or tea does not contain enough caffein to injure the system, yet the continual taking of these small doses results in a weakening of the whole system, that frequently leads to premature death.
Numerous analysis show that there are between one and two per cent of caffein in coffee, and between three and six percent in tea.
The effects of caffein on Sarsia may be best studied by immersing the animals in a saturated sea-water solution of the substance.
The effects of graduating the doses of caffein may be stated in connection with another species, viz.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "caffein" in a variety of sentences. We hope that you will now be able to make sentences using this word.
