| 单词 | glycerol |
| 例句 | This is partly because of the elevated amount of glycerol found in high-alcohol wines. For a Sweet 2020, Look to the Bitter in Wine 2019-12-26T05:00:00Z For example, infusing nanocellulose with a compound called glycerol enhances its flexibility and makes it more pliant. New study shows we can create value from food waste by turning it into a highly desirable material 2023-09-27T04:00:00Z It might come from the brightness of ripe fruit, or from glycerol, a harmless byproduct of fermentation that is more apparent in higher-alcohol wine. When Simplicity Can Be a Winemaking Virtue 2019-03-28T04:00:00Z The combination of fruitiness, alcohol and glycerol contributes to a perception of sweetness, even if the wine contains no residual sugar. For a Sweet 2020, Look to the Bitter in Wine 2019-12-26T05:00:00Z In a July 17 statement, the American Heart Association flagged “independent health risks” in the nicotine, including the flavoring agents, sweeteners, propylene glycol and vegetable glycerol used to make e-cigarettes. More adults think marijuana safer than tobacco despite similar health dangers, study finds 2023-08-11T04:00:00Z In a statement published Monday, the American Heart Association flagged “independent health risks” in the nicotine, flavoring agents, sweeteners, propylene glycol and vegetable glycerol used to make e-cigarettes. Over 10% of young adults vape, CDC finds 2023-07-21T04:00:00Z In humans, proteins need to be broken down into amino acids, starches into sugars, and fats into fatty acids and glycerol. Fundamentals of Biology 2015-01-01T00:00:00Z A fat molecule, such as a triglyceride, consists of two main components—glycerol and fatty acids. Concepts of Biology 2013-04-25T00:00:00Z When animal fats are treated with a base like potassium carbonate or sodium hydroxide, glycerol and salts of fatty acids such as palmitic, oleic, and stearic acid are formed. Chemistry 2019-02-14T00:00:00Z Like fats, they are composed of fatty acid chains attached to a glycerol or sphingosine backbone. Biology for AP Courses 2022-06-09T00:00:00Z Many lipids are formed by combining a glycerol molecule with fatty acids. Miller & Levine Biology 2018-01-01T00:00:00Z Triglycerides are the most abundant lipid in the body, and are composed of a glycerol backbone attached to three fatty acid chains. Anatomy and Physiology 2013-06-19T00:00:00Z Fats and oils are usually made up of fatty acids and glycerol. Concepts of Biology 2013-04-25T00:00:00Z In addition to nicotine, Juul pods contain a mix of glycerol, propylene glycol, benzoic acid and flavoring agents, the long-term health effects of which have yet to be determined, she said. The Risks of Another Epidemic: Teenage Vaping 2020-11-23T05:00:00Z Second, an ether bond instead of an ester bond connects the lipid to the glycerol. Biology for AP Courses 2022-06-09T00:00:00Z Writing in Nature, they demonstrate this with small toy boats floating in levitating layers of glycerol and silicon oil. Whatever floats your boat? Scientists defy gravity with levitating liquid 2020-09-02T04:00:00Z In conditions of long-term stress, for example, cortisol promotes the catabolism of glycogen to glucose, the catabolism of stored triglycerides into fatty acids and glycerol, and the catabolism of muscle proteins into amino acids. Anatomy and Physiology 2013-06-19T00:00:00Z Figure 2.18 Lipids include fats, such as triglycerides, which are made up of fatty acids and glycerol, phospholipids, and steroids. Concepts of Biology 2013-04-25T00:00:00Z They built a plexiglass container on top of a shaking machine and filled it with viscous liquids such as silicon oil or glycerol. Watch levitating upside-down boats flip the law of buoyancy 2020-09-02T04:00:00Z A typical fat consists of three fatty acids bonded to one molecule of glycerol, forming triglycerides or triacylglycerols. Biology for AP Courses 2022-06-09T00:00:00Z They include amino acids and glycerol, the backbones of fatty molecules that can form cells’ outer wall. The First Organism on Earth May Have Been a Genetic Hybrid 2020-06-22T04:00:00Z Notice that glycerol gives up a hydrogen atom, and the carboxyl groups on the fatty acids each give up a hydroxyl group. Anatomy and Physiology 2013-06-19T00:00:00Z Like fats, they are composed of fatty acid chains attached to a glycerol or similar backbone. Concepts of Biology 2013-04-25T00:00:00Z Sanitizer requires some different ingredients than they normally use, like hydrogen peroxide and glycerol. Wyoming distiller finds success in switch to hand sanitizer 2020-06-13T04:00:00Z A fat molecule consists of two main components—glycerol and fatty acids. Biology for AP Courses 2022-06-09T00:00:00Z The team pointed to two sugar alcohols, glycerol and propylene glycol, that may be the drivers of the changes in e-cigarette users’ mouths. Vaping causes 'slime cloak,' mouth stress, researchers say 2020-05-28T04:00:00Z The third binding site on the glycerol is taken up by the phosphate group, which in turn is attached to a polar “head” region of the molecule. Anatomy and Physiology 2013-06-19T00:00:00Z Instead of three fatty acids attached, however, there are two fatty acids and the third carbon of the glycerol backbone is bound to a phosphate group. Concepts of Biology 2013-04-25T00:00:00Z But the new production forced distillers to scramble for ingredients such as glycerol and hydrogen peroxide. Kentucky distillers churn out sanitizer in fighting virus 2020-04-17T04:00:00Z A fat may contain similar or different fatty acids attached to glycerol. Biology for AP Courses 2022-06-09T00:00:00Z He recently drove across the city, from pharmacy to pharmacy, looking for hydrogen peroxide and glycerol. How to Make Hand Sanitizer in Bulk 2020-04-07T04:00:00Z Three fatty acids, long chains of hydrocarbons with a carboxyl group and a methyl group at opposite ends, extend from each of the carbons of the glycerol. Anatomy and Physiology 2013-06-19T00:00:00Z A phospholipid is a lipid molecule composed of two fatty acid chains, a glycerol backbone, and a phosphate group. Concepts of Biology 2013-04-25T00:00:00Z The researchers also tested different fluid dynamics, such as air pressure and more viscous glycerol solutions, to see how they might affect the launch of fungal spores. This Fungus Fires Artillery From the Backs of Zombie Flies 2019-10-31T04:00:00Z Figure 3.20 A phospholipid is a molecule with two fatty acids and a modified phosphate group attached to a glycerol backbone. Biology for AP Courses 2022-06-09T00:00:00Z This includes mixtures containing glycerol oils, which are suspended in vaping flavours. What's behind a vaping illness outbreak in the US? 2019-09-10T04:00:00Z Some of the free glycerol released into the bloodstream travels to the liver, which converts it into glucose. Anatomy and Physiology 2013-06-19T00:00:00Z Glucose and other simple sugars, polysaccharides, amino acids, nucleic acids, fatty acids, and derivatives of glycerol are found there too. Concepts of Biology 2013-04-25T00:00:00Z It took years to develop a spongy, stable bread with just the right amount of moisture, trapped with a blend of gums, oils, sugars and a touch of glycerol. A Breakthrough for U.S. Troops: Combat-Ready Pizza 2018-09-20T04:00:00Z Fats are made up of fatty acids and either glycerol or sphingosine. Biology for AP Courses 2022-06-09T00:00:00Z But vaping liquids contain additives such as propylene glycol and glycerol that can form carcinogenic compounds when they are heated. Devices to Quit Smoking Become the Devices Teenagers Can’t Quit 2018-04-02T04:00:00Z The most common dietary lipids are triglycerides, which are made up of a glycerol molecule bound to three fatty acid chains. Anatomy and Physiology 2013-06-19T00:00:00Z Voegele, R. T., Sweet, G. D. & Boos, W. Glycerol kinase of Escherichia coli is activated by interaction with the glycerol facilitator. A global resource allocation strategy governs growth transition kinetics of Escherichia coli 2017-10-24T04:00:00Z And a British naval blockade, in turn, propelled German scientists into hijacking another fermentation process to create glycerol, needed to synthesize the explosive trinitroglycerine. History: Ingenious solutions sparked by a crisis : Nature : Nature Research 2017-08-15T04:00:00Z Triglycerides are made of glycerol and three fatty acids. Biology for AP Courses 2022-06-09T00:00:00Z Using a combination of glycerol and choline chloride, she and her team produced a soup slightly more viscous than maple syrup. The secret ingredient to early life’s primordial soup: Thickener 2016-10-10T04:00:00Z Once in the bloodstream, the enzyme lipoprotein lipase breaks down the triglycerides of the chylomicrons into free fatty acids and glycerol. Anatomy and Physiology 2013-06-19T00:00:00Z Next, he added glycerol, a thick liquid, to slow the molecules. Unusual Molecules Shine Light on New Applications 2016-02-15T05:00:00Z In the new study, Canadian researchers said they've discovered an enzyme in liver and pancreas cells in rats that they call glycerol 3-phosphate phosphatase. Scientists Identify Sugar-Busting Enzyme in Rats 2016-01-11T05:00:00Z The hydrophilic head group consists of a phosphate-containing group attached to a glycerol molecule. Biology for AP Courses 2022-06-09T00:00:00Z Also, 37 percent took prescription and/or over-the-counter diuretics, and 13 percent used intravenous lines and glycerol to rehydrate after a weigh-in. Mixed Martial Arts Fighters May Go to Dangerous Lengths to Shed Pounds 2015-10-13T04:00:00Z As starvation continues, and more glucose is needed, glycerol from fatty acids can be liberated and used as a source for gluconeogenesis. Anatomy and Physiology 2013-06-19T00:00:00Z Brands like Camel use additives such as glycerol and corn syrup to flavor the cigarettes. Groups Complain to FDA About Natural American Spirit Cigarettes 2015-08-27T04:00:00Z The stool was mixed with saline and put through sieves to remove “the yucky stuff,” Dr. Youngster said, then centrifuged and mixed with glycerol to keep bacteria alive when frozen. A Promising Pill, Not So Hard to Swallow 2014-10-11T04:00:00Z Cholesterol synthesis starts with acetyl groups, and the components of triglycerides come from glycerol-3-phosphate from glycolysis and acetyl groups produced in the mitochondria from pyruvate. Biology for AP Courses 2022-06-09T00:00:00Z On Monday, would stop using brominated vegetable oil and replace it with sucrose acetate isobutyrate or glycerol ester of rosin, which is found in chewing gum. Teen vegan fights big corporations 2014-05-07T15:32:32Z In conditions of low glucose, such as fasting, starvation, or low carbohydrate diets, glucose can be synthesized from lactate, pyruvate, glycerol, alanine, or glutamate. Anatomy and Physiology 2013-06-19T00:00:00Z It said it would replace the oil with sucrose acetate isobutyrate and glycerol ester of rosin, either singly or in combination. Coca-Cola to Remove an Ingredient Questioned by Consumers 2014-05-06T01:38:31Z Coca-Cola said it would switch to using sucrose acetate isobutyrate or glycerol ester of rosin, which is commonly found in chewing gum. Coca-Cola to remove drinks ingredient 2014-05-06T01:03:40Z Cholesterol and triglycerides can be converted to glycerol-3-phosphate that continues through glycolysis. Biology for AP Courses 2022-06-09T00:00:00Z In 2010, the researchers figured out why: the drug only blocked the ability of the mycobacteria to survive in its glycerol suspension — leaving it with little relevance in the world beyond the test tube. Drug development: A combined effort 2013-10-09T17:20:55.343Z Lipolysis is the breakdown of triglycerides into glycerol and fatty acids, making them easier for the body to process. Anatomy and Physiology 2013-06-19T00:00:00Z Widely used in foods and pharmaceuticals, glycerol is a key component of glycerin soap. City Room: Skipping the Gas Pump, and Getting Fuel From a Deep Fryer 2013-05-29T15:59:02Z When a number of methanogens were examined for lipid composition, our expectation was confirmed: their lipids turned out to be typically archaebacterial branched chain glycerol ethers. Archaebacteria: The Third Domain of Life Missed by Biologists for Decades 2013-01-01T00:45:00.170Z Cells can only survive freezing if the water in them is temporarily replaced by another liquid like glycerol. Biology for AP Courses 2022-06-09T00:00:00Z Platelets formed only when Goff's team added commonly used unsaturated emulsifiers, such as glycerol monooleate, which are thought to force the fat crystals to grow preferentially in one dimension, hence generating the needlelike profile. Scientists Turn To Unsaturated Fats For Healthier Ice Cream 2012-12-30T14:45:00.183Z These effects are discussed in the section on glycerol additions beginning on page 17. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z In this reaction a glycerol ester is formed as an intermediate product, and undergoes decomposition by the water which is also produced at the same time. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 "Foraminifera" to "Fox, Edward" 2011-04-22T02:00:08.637Z Freeze-avoiding insects actively produce anti-freeze compounds – including glycerol, proteins, and sugars – that enhance their ability to supercool, allowing body fluids to remain unfrozen at temperatures even further below their freezing point. Winter stoneflies sure are supercool 2011-02-24T17:15:00.230Z A phospholipid is a molecule consisting of glycerol, two fatty acids, and a phosphate-linked head group. Biology for AP Courses 2022-06-09T00:00:00Z As winter approaches, many freeze-tolerant insects produce high concentrations of glycerol and other kinds of alcohol molecules. 2010-01-19T17:25:00Z Based on these findings, a glycerol level of 7 percent was adopted for use in all experiments described in this bulletin, unless otherwise indicated. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z The glycerine water is first evaporated to about 60 per cent. glycerol, then dropped into a settling tank to settle out the calcium sulfate. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. To prevent subsequent cell dehydration and stabilize the cell membranes, freeze tolerant insects also produce the anti-freeze compound glycerol. Winter stoneflies sure are supercool 2011-02-24T17:15:00.230Z Lipoids are much more complex esters, having some nitrogenous, or phosphorus-containing, group and sometimes a sugar in combination with the fatty acids and glycerol which make up the characteristic part of their structure. The Chemistry of Plant Life The Absorption of Fat.—The fats, as has been described, are split into their two constituents, fatty acid and glycerol. Dietetics for Nurses In fact, some have gone to a procedure of adding the glycerol dropwise with constant gentle agitation. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z At the present time the prices of glycerol and caustic potash are abnormally high, but the committee has considered that the methods adopted are for normal times and normal prices. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. Cellulose itself cannot act as a food supply, and it seems probable that if glycerol is present cellulose nitrate is no longer made use of. Researches on Cellulose 1895-1900 The acids which, when combined with glycerol, produce fats are of two general types. The Chemistry of Plant Life The lipases split the fats to fatty acids and glycerol. Dietetics for Nurses Allowing sperm to stand in the presence of glycerol is considered by some to be necessary in order that the glycerol penetrate the sperm heads before freezing. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z After correcting for the blank, calculate the result to glycerol. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. Acetin Method.—This consists in converting the glycerol into its ester with acetic acid, the acetic triglyceride, or triacetin being formed. The Handbook of Soap Manufacture In these, various sugars replace part or all of the glycerol as the alcoholic part of the ester. The Chemistry of Plant Life The comb is composed largely of wax, which has somewhat the same general composition as fat, but contains ethereal instead of glycerol bodies. Human Foods and Their Nutritive Value Later, in a personal communication, Polge of the British group suggested that a citrate level of about 2.35 percent might be best with a final glycerol concentration of 7 percent. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z The percentage of glycerol obtained above includes any oxidizable impurities present after the purification. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. Caustic soda exerts a marked retarding effect on the hydrolysis, as do also ethyl and amyl alcohols and glycerol. The Handbook of Soap Manufacture When glycerol is heated with dehydrating agents, it is easily converted into acrolein, an unsaturated aldehyde having a peculiar characteristic pungent odor. The Chemistry of Plant Life A solution of the medicine principle of a substance in a fluid other than water or glycerol. Mother's Remedies Over One Thousand Tried and Tested Remedies from Mothers of the United States and Canada The most noticeable effect of the increase in glycerol level was the reduction in the rate of forward motion of the sperm. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z A Acetin process for the determination of glycerol, 155. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. Recent work, however, has shown the existence of several so-called mixed glycerides, in which the hydroxyls of the same molecule of glycerol are displaced by two or sometimes three different acid radicles. The Handbook of Soap Manufacture The fats undoubtedly catabolize first by hydrolysis into glycerol and fatty acids, and then by oxidation possibly first into carbohydrates and then finally into the end-products of oxidation, namely, carbon dioxide and water. The Chemistry of Plant Life Glycerin, otherwise called glycerol, is intermediate between sugar and alcohol. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries A comparison of the results from adding the glycerol in 5, 3, and 1 equal portions is given also in Table 11. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z From the amount of bichromate reduced calculate the percentage of glycerol. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. In some cases the fatty acids are combined with other bases than glycerol. The Handbook of Soap Manufacture Fourth, that the sugar produced by the oxidation of fats is derived either from the glycerol or from the fatty acids of the fat, depending upon the nature of the latter. The Chemistry of Plant Life By agitating glycerol with chloroform, fatty acids, rosin oil, and some other impurities are dissolved, while certain others form a turbid layer between the chloroform and the supernatant liquid. Nitro-Explosives: A Practical Treatise Since glycerol was so effective in protecting sperm during freezing, many have assumed that related compounds might be even better. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z From this adipocere, fatty acids would be gradually formed, the glycerol being washed away, and finally the acids would be decomposed by the pressure into hydrocarbons and free carbonic acid gas. Scientific American Supplement, No. 829, November 21, 1891 Schutzenberger in 1876 showed that when castor seeds are steeped in water, fatty acids and glycerol are liberated, and attributed this to the hydrolytic action of an enzyme present in the seeds. The Handbook of Soap Manufacture Since waxes contain no glycerol, they give no odor of acrolein when heated with dehydrating agents, do not become rancid, and are less easily hydrolyzed than the fats. The Chemistry of Plant Life This mixture when heated separates into two layers, the upper one viscid and forming a sort of "glycerol," the lower clear. Scientific American Supplement, No. 787, January 31, 1891 The resulting glycerol percentages after mixing the sidearm and main compartment contents were 0, 4, 8, and 12 percent. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z An empty catch-flask should be connected between the generator and the absorption flask in case any glycerol tends to suck back at the start of the reaction. Organic Syntheses By this method, sulpho-compounds of the glyceride are first formed, which readily emulsify with water, and, on treatment with steam, liberate fatty acids, the glycerol remaining partly in the form of glycero-sulphuric acid. The Handbook of Soap Manufacture Xylose was less effective, but its addition resulted in slightly better sperm survival than glycerol alone. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z Several compounds, some related to glycerol and some not, have been tried as substitutes for glycerol in the freezing procedure. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z Still, the detrimental effects of the higher levels of glycerol were not completely removed. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z The previous work, described in the literature, indicated that the best yields were obtained by the treatment of glycerol containing 1-2 per cent of acetic acid as a catalyst by gaseous hydrogen chloride. Organic Syntheses The amount of free fatty acids is always high and ranges from 40-70 per cent., and, of course, its glycerol content is proportionately variable. The Handbook of Soap Manufacture A final trial was run, using glycerol levels of 7, 11, 15, 19, 23, 27, and 31 percent. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z In this way a concentration of 7 percent glycerol is obtained in the final mixture that is to be frozen. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z Except where glycerol was added during the determination, the rate of oxygen utilization was lower the second hour than during the first. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z As a viscolizer, a substance such as starch, glycerol, glue or gelatine may be used; the last, however, gives by far the most satisfactory results. Organic Syntheses This is then saponified with a known volume of standard alkali, the excess of which is titrated with acid, and the percentage of glycerol calculated from the amount of alkali absorbed. The Handbook of Soap Manufacture Originally it was believed that the glycerol should be added in stages so that changes would occur gradually. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z While little difference was evident from adding the glycerol in 3 portions as compared to 1, many still use 3 additions in the hope of obtaining a slightly better sperm survival. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z This increase was greatest in the portions with glycerol alone and with glycerol and glucose. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z In a number of experiments, the glycerol used contained an appreciable amount of water. Organic Syntheses None of these materials has been as effective as glycerol in protecting sperm during freezing. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z The percentage of motile sperm decreased slightly at the higher levels of glycerol. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z It was known that glycerol worked well in protecting sperm during freezing. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z Some samples were checked after slowly bringing the diluent up to a level of 40 percent glycerol; the sperm seemed to be immobilized completely in this solution. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z "Dynamite" glycerol containing less than half a per cent of water is best employed; U. S. P. glycerol contains 5 per cent of water and usually gives lower yields. Organic Syntheses The effects of glycerol on sperm at 5° C., the appropriate levels to use in freezing, and the manner of adding it were not well established. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z It may be that the presence of the higher levels of glycerol at 38° C. brought about harmful metabolic activity. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z After the first 20 minutes, the rate of oxygen utilization decreased at the two higher levels of glycerol but persisted at 4 percent. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z From Table 9 it can be seen that glycerol levels of 6 and 8 percent in the final mixture resulted in maximum sperm survival during freezing. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z The rate of oxygen consumption for the first 20-minute period at the 4-percent glycerol level was 130 percent that of the control to which only sodium citrate had been added. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z Certain bacteria have been shown to break glycerol down, forming hydrogen peroxide as follows: Glycerol + oxygen → lactic acid + hydrogen peroxide. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z The next year they found that bull sperm and the sperm of several other species were protected by glycerol during freezing. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z However, the general trend in oxygen consumption produced by the addition of glycerol was not changed greatly. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z Thirty-six samples were subjected to various levels of glycerol and no significant difference in freezability was found between 6 and 8 percent. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z The higher levels of glycerol still stimulated oxygen uptake during the first 20-minute period after the additions and then slowed the rate of oxygen utilization. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z It appeared that a part of the harmful effect of glycerol might be due to the formation of hydrogen peroxide. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z The reason for the interaction between glycerol level and thawing temperature is not known. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z Survival of the sperm with 4 percent glycerol was so poor that only a few breedings were made with these samples. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z Closely associated with the question of how much glycerol should be added is that of how the additions should be made. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z Yet, as shown in Table 6, in our laboratory 5 percent glycerol resulted in the survival of a higher percentage of sperm than did 10 or 15 percent. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z Use of higher glycerol levels and a -20° C. storage temperature. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z Comparison of the resulting oxygen uptake with glycerol and with glycerol plus catalase is shown in Figure 11. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z Portions of each diluted sample were tested at these stages of the procedure with glycerol alone added and with glycerol and various sugars added. Preservation of Bull Semen at Sub-Zero Temperatures 2011-08-13T02:00:22.680Z |
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