| 单词 | hydroxyl group |
| 例句 | In the end, swapping the position of a hydrogen atom and a hydroxyl group on the backbone of the molecule blocked its ability to bind to cholesterol. New antifungal kills without toxic side effects 2023-11-08T05:00:00Z Figure 9.5 The difference between the ribose found in RNA and the deoxyribose found in DNA is that ribose has a hydroxyl group at the 2' carbon. Concepts of Biology 2013-04-25T00:00:00Z If the hydroxyl group was not present, we would have named this molecule pentane. Chemistry 2019-02-14T00:00:00Z During this process, the hydroxyl group of one monosaccharide combines with the hydrogen of another monosaccharide, releasing a molecule of water and forming a covalent bond. Biology for AP Courses 2022-06-09T00:00:00Z Fluoride can displace the hydroxyl group in bone’s hydroxyapatite crystals and form fluorapatite. Anatomy and Physiology 2013-06-19T00:00:00Z The authors also discovered that one of the candidate cytochrome P450 enzymes catalyses two steps in the proposed biosynthetic pathway: the installation of two hydroxyl groups on a benzene ring in an intermediate compound. How the flame lily synthesizes a therapeutic natural product 2020-07-21T04:00:00Z The particular hydroxyl groups found on Ryugu appear to be associated with the element magnesium, which is often associated with clay minerals in meteorites. Asteroid mission exploring a 'rubble pile' 2019-03-19T04:00:00Z Alcohols containing two or more hydroxyl groups can be made. Chemistry 2019-02-14T00:00:00Z The difference between the sugars is the presence of the hydroxyl group on the second carbon of the ribose and hydrogen on the second carbon of the deoxyribose. Biology for AP Courses 2022-06-09T00:00:00Z One portion of the severed compound then bonds with the hydrogen atom, and the other portion bonds with the hydroxyl group. Anatomy and Physiology 2013-06-19T00:00:00Z Cyclodextrins are sugar molecules arranged in a ring such that the sugar’s hydroxyl groups are perpendicular to the plane of the ring. A faster, cheaper water filter, thanks to sugar 2015-12-21T05:00:00Z Similarly to regular cellulose, ethyl cellulose is an indigestible chain of repeating glucose molecules; the only difference is that the hydroxyl groups of ethyl cellulose are modified into ethyl ether groups. Something to Chew On: Healthier Hot Dogs Substitute Cellulose for Saturated Fats 2012-03-19T20:45:00.267Z Changing one of these hydroxyl groups to a methyl ether group forms codeine, a less potent drug used as a local anesthetic. Chemistry 2019-02-14T00:00:00Z Polymers break by separating water into hydrogen and hydroxyl group that are added to the monomers. Biology for AP Courses 2022-06-09T00:00:00Z Each monomer contributes: One gives up a hydrogen atom and the other gives up a hydroxyl group. Anatomy and Physiology 2013-06-19T00:00:00Z The process requires replacing three of sugar’s hydroxyl groups with chlorine atoms. A Missouri Town's Sweet Dreams Sour 2012-01-05T20:30:59Z As the hydroxyl groups in aurin correspond to the amino groups in pararosaniline, two of these in the latter compound must be in the para position. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z Ethanol has two carbon atoms linked to five hydrogen atoms, plus a hydroxyl group. Fuel options: The ideal biofuel 2011-06-22T21:50:40.910Z Polymers are synthesized by using the energy released by the breaking of water molecules into hydrogen and hydroxyl group. Biology for AP Courses 2022-06-09T00:00:00Z The bonds between their monomers are broken, via the donation of a molecule of water, which contributes a hydrogen atom to one monomer and a hydroxyl group to the other. Anatomy and Physiology 2013-06-19T00:00:00Z Phenylalanine and tyrosine are structurally identical except for the hydroxyl group on tyrosine that renders the residue phosphorylatable. [Technical Response] Response to Comment on ?Positive Selection of Tyrosine Loss in Metazoan Evolution? 2011-05-19T18:25:18.573Z Bases may be considered as salts with the hydroxyl group, OH, replacing the acid radical. The Mechanism of Life Resorcinol is a phenolic derivative of benzene containing two hydroxyl groups; it is therefore related to phenol in the same way that diamidobenzene is related to aniline or phthalic acid to benzoic acid. Coal and What We Get from It Water, which was broken down into its hydrogen atom and hydroxyl group during ATP hydrolysis, is regenerated when a third phosphate is added to the ADP molecule, reforming ATP. Biology for AP Courses 2022-06-09T00:00:00Z 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 The meta-nitro-compound, which is precipitated last, is then reduced, and the amino group so formed is replaced by the hydroxyl group by means of the Sandmeyer reaction. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" The substitution of a hydrogen atom by the hydroxyl group generally occasions a rise in boiling-point at about 100�. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" It differs from cellulose in containing free carboxyl, CO, groups, while its hydroxyl groups, HO, are much more active in their chemical reactions. The Dyeing of Cotton Fabrics A Practical Handbook for the Dyer and Student When a polynucleotide is formed, the 5′ phosphate of the incoming nucleotide attaches to the 3′ hydroxyl group at the end of the growing chain. Biology for AP Courses 2022-06-09T00:00:00Z Glycerol gives up hydrogen atoms from its hydroxyl groups at each bond, and the carboxyl group on each fatty acid chain gives up a hydroxyl group. Anatomy and Physiology 2013-06-19T00:00:00Z The hydrogen of the hydroxyl group in phenol can be replaced by metals, by alkyl groups and by acid radicals. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" The nitro group behaves very similarly to the hydroxyl group. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" When a base dissolves in water the hydroxyl groups form the anions, while the metallic element forms the cations. An Elementary Study of Chemistry If, for example, a substance contains alkyl or hydroxyl groups, large quantities of the para compound are obtained, and very little of the ortho. Nitro-Explosives: A Practical Treatise The hydrogen in the hydroxyl group, as is known, may be substituted by an alkyl group. Scientific American Supplement No. 822, October 3, 1891 Morphine, C17H19NO3, is a tertiary amine, and appears to contain a hydroxyl group like phenols, to which class of bodies it has some analogies, as is shown in its reaction with ferric chloride. Scientific American Supplement, No. 415, December 15, 1883 The amino group is more powerful than the hydroxyl, and the substituted amino group more powerful still; the repeated substitution of hydroxyl groups sometimes causes an intensification and sometimes a diminution of colour. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" They are distinguished from each other by prefixing the name of the element which is in combination with the hydroxyl group. An Elementary Study of Chemistry ALCOHOLS, in organic chemistry, a class of compounds which may be considered as derived from hydrocarbons by the replacement of one or more hydrogen atoms by hydroxyl groups. The Project Gutenberg Encyclopedia Volume 1 of 28 This would then lead to curious conclusions concerning the hydroxyl group. Scientific American Supplement No. 822, October 3, 1891 By transformations of the carbonyl group, and at the same time of the hydroxyl group, many interesting types of nitrogen compounds may be correlated. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" The hydroxyl group also resembles the methyl group in its morphotropic effects, producing, in many cases, no change in symmetry but a dimensional increase in one direction. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" Alcohols are classified on two distinct principles, one depending upon the number of hydroxyl groups present, the other on the nature of the remaining groups attached to the carbon atom which carries the hydroxyl group. The Project Gutenberg Encyclopedia Volume 1 of 28 Sir Edward Frankland showed how it could be derived from, and converted into, ethane; and thus determined it to be ethane in which one hydrogen atom was repiaced by a hydroxyl group. The Project Gutenberg Encyclopedia Volume 1 of 28 Sodium or potassium dissolves in them with the formation of alcoholates, the hydrogen of the hydroxyl group being replaced by the metal. The Project Gutenberg Encyclopedia Volume 1 of 28 |
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