| 单词 | caffein |
| 例句 | In the year 1821, several chemists isolated from coffee a bitter principle, of peculiar properties, which was named caffein. Joseph Smith as Scientist A Contribution to Mormon Philosophy 2012-03-12T03:00:27.817Z The principle of coffee is the caffein, discovered by Robiquet, in 1821; and it is to this active principle that its beneficial or baneful effects can be attributed. Curiosities of Medical Experience 2012-03-09T03:00:20.410Z As heart stimulants, one may use strychnine, spartein, caffein, or camphor. Arteriosclerosis and Hypertension: with Chapters on Blood Pressure, 3rd Edition. 2011-10-11T02:01:07.890Z The water extracts certain flavoring and coloring matters, but that which gives it its peculiar stimulant qualities is the alkaloid caffein. A Treatise on Physiology and Hygiene For Educational Institutions and General Readers If the animal is unconscious, hypodermic injections of stimulants are indicated, such as 6 drams of camphorated oil in one dose, subcutaneously, or 20 grains of caffein or ½ grain of strychnin, also subcutaneously. Special Report on Diseases of Cattle Numerous analysis show that there are between one and two per cent of caffein in coffee, and between three and six percent in tea. Joseph Smith as Scientist A Contribution to Mormon Philosophy 2012-03-12T03:00:27.817Z Influence of caffein on mental and motor efficiency. All About Coffee For the headaches, phenacetin, alone or in combination with caffein and bromide of sodium, may be tried. Arteriosclerosis and Hypertension: with Chapters on Blood Pressure, 3rd Edition. 2011-10-11T02:01:07.890Z This principle is probably the same as that found in coffee, caffein, since the chemical composition of both is precisely alike. A Treatise on Physiology and Hygiene For Educational Institutions and General Readers When surgical treatment is contra-indicated, all that can be done is to palliate the symptoms by bromides, opium, phenacetin, caffein, and other drugs. Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. Later investigations have shown that caffein belongs to the vegetable poisons, and that its poisonous action is very strong. Joseph Smith as Scientist A Contribution to Mormon Philosophy 2012-03-12T03:00:27.817Z The action of caffein on tissue metamorphosis and heat phenomena. All About Coffee It has never arrested attention as a distinct grade of the article, but it contains more coffee or caffein to the pound than any berry known to commerce. Woodcraft Tonic treatment consists in the subcutaneous administration of artificial serum and caffein. Special Report on Diseases of the Horse The caffein or theine in tea is an alkaloid that has characteristic physiological properties. Human Foods and Their Nutritive Value 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." Joseph Smith as Scientist A Contribution to Mormon Philosophy 2012-03-12T03:00:27.817Z The chief factors in coffee goodness are the caffein content and the caffeol. All About Coffee They contain less caffein than either tea or coffee, but are liable to clog rather than to increase the appetite for other foods. A Handbook of Health If the burns are extensive, the constitutional symptoms should be combated with whisky and milk and eggs, or ammonia carbonate, strychnin, caffein, or other stimulant to prevent shock. Special Report on Diseases of the Horse Tannic acid, not as free acid, is combined with caffein as a tannate. Human Foods and Their Nutritive Value Besides caffein, both tea and coffee contain an astringent known as tannic acid. Joseph Smith as Scientist A Contribution to Mormon Philosophy 2012-03-12T03:00:27.817Z Much advertising emphasis has been placed on the small amount of caffein extracted by some devices. All About Coffee 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. A Handbook of Health Many so-called patent or proprietary medicines contain habit-forming drugs, especially morphine, coal-tar preparations, caffein, and alcohol, and depend largely for their sale upon the effects of these harmful substances. How to Live Rules for Healthful Living Based on Modern Science Nice, using very small numbers of white mice, subjected them not only to alcohol, but to caffein, nicotin, and tobacco smoke. Applied Eugenics 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. Joseph Smith as Scientist A Contribution to Mormon Philosophy 2012-03-12T03:00:27.817Z There is something more to coffee than its caffein stimulus, its action on the taste-buds of the tongue and mouth. All About Coffee The caffein of tea is sometimes called thein, and that of cocoa theobromin; but they are all practically the same substance. A Handbook of Health The mild stimulating property which cocoa possesses is due to the presence of the two substances, theobromine and caffein. Cocoa and Chocolate Their History from Plantation to Consumer Vomiting, for example, can sometimes be checked by effervescing drinks, such as citrate of caffein, or by dilute hydrocyanic acid and bismuth. Manual of Surgery Volume First: General Surgery. Sixth Edition. Some people have been drinking coffee, although they do not like the taste of it, because they want the stimulating effect of its alkaloid, caffein. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries A portion of the original caffein content is lost by sublimation. All About Coffee Part of the taste of these beverages is due to the caffein, but the special flavor of each is given by spicy oils and other substances which it contains. A Handbook of Health The presence of theobromine is peculiar to cocoa, but caffein is a stimulating principle which also occurs in tea and coffee. Cocoa and Chocolate Their History from Plantation to Consumer In his experiments he discovered that the fibre of cotton, in its natural state before bleaching, neutralizes the harmful principle of the caffein. The Easiest Way in Housekeeping and Cooking Adapted to Domestic Use or Study in Classes Other people liked the warmth and flavor of coffee but find that caffein does not agree with them. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries The only accurate analysis which can be made is that for caffein. All About Coffee Yet the first step must in this case be the study of the effects of the isolated caffein, before the total influences of the familiar beverages can be followed up. Psychology and Industrial Efficiency It will be seen from the above analysis that the cacao bean is rich in fats, carbohydrates and protein, and that it contains small quantities of the two stimulants, theobromine and caffein. Cocoa and Chocolate Their History from Plantation to Consumer Coffee contains caffein, a principle identical with theine and a modified form of tannin, though in less quantity than tea. Science in the Kitchen. 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. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries The action of caffein on the capacity for muscular work. All About Coffee They give pleasure by their aroma, but they are given a peculiar position among articles of diet by the presence in them of the compound caffein, which is distinctly a drug. How to Use Your Mind A Psychology of Study: Being a Manual for the Use of Students and Teachers in the Administration of Supervised Study The increased blood pressure caused by caffein also contraindicates its use when there is hypertension. Disturbances of the Heart Seeing no actual evidence of death, the physicians injected camphor and caffein and took other restorative steps, with the result that in an hour the woman breathed again! The Grey Room Weigh the residue as caffein and calculate on 7.5 grams of coffee. All About Coffee The effect on the kidneys is more marked, the diuretic effect being shown by an increase in water, soluble solids, and of uric acid directly attributable to the caffein content of the coffee taken. All About Coffee Individual susceptibility to the action of caffein varies greatly. How to Use Your Mind A Psychology of Study: Being a Manual for the Use of Students and Teachers in the Administration of Supervised Study This action on the kidney contraindicates the use of caffein in any form, except in rare instances, when there is acute or chronic nephritis. Disturbances of the Heart This gives the total nitrogen due to both the proteids and the caffein. All About Coffee From these Hollingworth concluded that caffein influenced all the tests in a given group in much the same way. All About Coffee However, chemists have not yet been able to expel all the caffein in treating coffee commercially, the best efforts resulting in from 0.3 to 0.07 percent remaining. All About Coffee The two principal factors which seem to modify the degree of caffein influence are body weight and presence of food in the stomach at the time of ingestion of the caffein. All About Coffee Coffee or caffein often causes these hearts to become irritable; it certainly raises the blood pressure, and therefore is not generally advisable. Disturbances of the Heart In making the tests on animals, they found that individuality, season, age, species, and certain pathological conditions caused variation in the toxic effect of the administered caffein. All About Coffee Low protein diet tends to decrease resistance to caffein in dogs, and a milk or meat diet does the same for growing dogs. All About Coffee One does not see in a Yuban advertisement any reference to the "removal of caffein", or to Yuban's "freedom from defects common to other coffees." All About Coffee The muscles and the simultaneously-acting nerves only under the influence of caffein respond more easily to the impulse of the will, but do not develop spontaneous activity; that is, without the co-operation of the will. All About Coffee 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. Disturbances of the Heart The flavor is due largely to the volatile aromatic constituents, "caffeol," which, when isolated, have a general depressant action on the system; and the stimulation is caused by the caffein. All About Coffee In not a single instance during his experiments at Columbia University did depression follow the use of caffein. All About Coffee So that if one device extracts less caffein than another, that fact alone is nothing in favor of the former. All About Coffee Coffee and caffein are physiologically antagonistic to the common narcotics, nicotine, morphine, opium, alcohol, etc., and are frequently used as antidotes for these poisons. All About Coffee 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. Disturbances of the Heart Pure caffein forms long, white, silky, flexible needles, which readily felt together to form light, fleecy masses. All About Coffee Test the purity of the residue by determining nitrogen and multiplying by 3.464 to obtain caffein. All About Coffee If the consumer does not want caffein in his drink there are caffein-free coffees on the market. All About Coffee The stimulating tendency of the caffein to sustain and to "tide over" those of low vitalities is also evidenced. All About Coffee In the morning hours of the day the value of caffein as a cardiac stimulant and vasocontractor, either in the form of caffein or as black coffee, should be remembered. Disturbances of the Heart In a series of experiments, J. Hughes Bennett found that within narrow limits there is a direct physiological antagonism between caffein and morphine. All About Coffee The caffein in the roasted coffee is not as tightly bound chemically as in the green coffee, and is, therefore, more easily extracted. All About Coffee The caffein furnishes the stimulation for which coffee is generally consumed. All About Coffee These substances, which are essential for the maintenance of quality by the coffee, though readily separated from the caffein, can not be returned to the roasted bean with any degree of certainty. All About Coffee The most frequent form of caffein used is the citrated caffein. Disturbances of the Heart On the other hand, beans from which the caffein is extracted with volatile solvents, if the operation be conducted carefully, should give a natural-tasting roast. All About Coffee General Physiological Action of Caffein More attention has been given to the study of the physiological action of caffein than to that of the other individual constituents of coffee. All About Coffee In undue somnolence, in nervous headache, in narcotism, also, at times when the exigencies of life require excessively prolonged wakefulness, caffein may be used as the most powerful agent known for producing wakefulness. All About Coffee With larger doses of caffein the action extends from the psychical areas to the motor area and to the cord, and the patient becomes at first restless and noisy, and later may show convulsive movements. All About Coffee Other preparations of caffein may be selected if desired, or a soluble preparation may be given hypodermically. Disturbances of the Heart The character of caffein action makes plain that these food materials do not injure the organism by their caffein content, and do not by continued use cause any chronic form of illness. All About Coffee In practically all of the tests the magnitude of the caffein influence varied inversely with the body weight, and was most marked when taken on an empty stomach or without food substance. All About Coffee In general, the medicinal value of coffee may be said to be directly attributable to its caffein content, although its antiseptic properties are dependent upon the volatile aromatic constituents. All About Coffee In fact, if anything, the process is undesirable; as some of the extractive matters present in the coffee, and particularly caffein, will be lost. All About Coffee If digitalis is administered, it will act as a diuretic; if caffein is deemed advisable, that will act as a diuretic. Disturbances of the Heart Eventually the caffein content is absorbed by the system, and from thence on a stimulation is apparent. All About Coffee Of course, caffein, like any other alkaloid, if used to excess will prove harmful, due to the over-stimulation induced by it. All About Coffee 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. All About Coffee As a cardiac stimulant, caffein may be used in any form of heart failure; the indications for its use are those which call for the employment of digitalis. All About Coffee In such a condition calcium, iron and strychnin, not too frequently or in too large doses, and perhaps caffein, are indicated. Disturbances of the Heart And, again, the caffein content of the brew, as will be seen, tends to counteract any possible desultory effects of the caffeol. All About Coffee Since certain of the effects of coffee drinking have been attributed to this alkaloid, a brief presentment of the pharmacology of caffein will be given as an exposition of the many statements made regarding it. All About Coffee To this behavior can probably be attributed the difficulty experienced in extracting caffein from coffee with dry organic solvents. All About Coffee So in recent years, other drugs have been introduced, allies of caffein, which act like it on the kidneys, but are without the stimulant action on the brain. All About Coffee 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. Disturbances of the Heart If the roast be carried almost to the point of carbonization, as in the case of the "Italian roast," the caffein content will be almost nil. All About Coffee However, the great objection to this method arises from the fact that at the same time as the caffein is extracted, the volatile aromatic and flavoring constituents of the coffee are removed also. All About Coffee While the therapeutic dose of caffein is broken up in the body with the formation of methylxanthin, which escapes with the urine, the toxic dose is at least in part eliminated by the kidney unchanged. All About Coffee This compound is water-soluble, but caffein can not be extracted from the crystals with anhydrous solvents. All About Coffee The effects of caffein and tobacco on the heart will be considered later when toxic disturbances are under discussion. Disturbances of the Heart 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. All About Coffee A considerable portion of the caffein is sublimed off during roasting, thus decreasing the amount in the bean. All About Coffee The metabolism of the methyl purins, of which group caffein is a member, appears to vary with the quantity ingested. All About Coffee The beans are then steam distilled to remove the caffein, dried, and roasted. All About Coffee If it makes a nervous patient more nervous, or a quiet patient restless and irritable, it is acting for harm and should be stopped, just as caffein under the same conditions should be stopped. Disturbances of the Heart Some of the caffein-free coffees on the market show upon analysis almost as much caffein as the natural bean. All About Coffee Decomposition of the caffein acid-salt and considerable sublimation of the caffein also occur. All About Coffee The spinal and muscular hyperic excitability produced by caffein is, in his opinion, due to the methyl groups attached to the xanthin nucleus. All About Coffee This reaction partly explains why the amount of caffein recovered from the roaster flues is not commensurate with the amount lost from the roasting coffee; although incomplete condensation is also an important factor. All About Coffee This is true of hypertension, of arteriosclerosis, of nicotin unless the heart has become injured, and often of caffein, unless it acts in the individual as a nervous stimulant. Disturbances of the Heart He attributed the retarding effect to the tannic acid of the tea and the volatile constituents of the coffee—the caffein itself favoring digestion rather than otherwise. All About Coffee 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. All About Coffee However, in the cases where aqueous extraction is employed, other substances besides caffein are removed that are replaced in the bean only with difficulty. All About Coffee Coffee chaff and roaster-flue dust have been proposed as sources for medicinal caffein, but the extraction of the alkaloid from the former has not proven to be a commercial success. All About Coffee If he feels faint, he will feel better the moment he lies down, and in this instance he may be improved by a cup of coffee, or a dose of caffein or camphor. Disturbances of the Heart Many ingenious methods have been devised for the ready removal of the caffein from this point on. All About Coffee Several processes employ an alkali, such as ammonium hydroxid, to free the caffein from the acid; or an acid, such as acetic, hydrochloric, or sulphurous, is used to form a more soluble salt of caffein. All About Coffee Coffee and caffein in narcotic poisoning are of value as a means of keeping the patient awake, and of stimulating the respiratory centres. All About Coffee This is not a suitable coffee for one desiring an almost caffein-free drink, for the empyreumatic products produced by this excessive roasting will be more toxic by far than the caffein itself would have been. All About Coffee This is one more reason for abstinence from tea and coffee in the evening by those patients who are at all disturbed by the caffein. Disturbances of the Heart In the endeavor to develop a commercial decaffeinated coffee the first method of procedure was to extract the caffein from roasted coffee. All About Coffee As is usual in most of the coffee species, caffein is present. All About Coffee Some of the French and German investigators have reported coffee from these regions that was absolutely devoid of caffein. All About Coffee Salts of an unstable nature are formed with caffein by most acids. All About Coffee This acid compound of caffein will be largely decomposed during the process of torrefaction, so that in roasted coffee a larger percentage will be present in the free state. All About Coffee In addition to these mineral matters, the pulp also contains about 0.88 percent of caffein and 18 to 37 percent sugars. All About Coffee Coffee, as is well known, contains an active principle known as caffein which acts as a stimulant to the nervous system and in small quantities is very beneficial. All About Coffee Microscopic examination of the roasted beans will show occasional small crystals of caffein in the indentations on the surface, where they have been deposited during the cooling process. All About Coffee Various investigators report the presence of sugar, tannin, iron, salts, and caffein. All About Coffee The filtrate contains tannin, caffein, color, and fat. All About Coffee |
| 随便看 |
|
英语例句辞典收录了117811条英语例句在线翻译词条，基本涵盖了全部常用单词及词组的例句翻译及用法，是英语学习的有利工具。