| 单词 | divalent |
| 例句 | Then I would need to arrange for accurate measurement of both the divalent metals and the DNA content. Double Helix 1968-02-27T00:00:00Z As to the forces that held the chains together, the best guess seemed to be salt bridges in which divalent cations like Mg++ held together two or more phosphate groups. Double Helix 1968-02-27T00:00:00Z Andre was very keen about the role of divalent metals in phage multiplication and so was receptive to my belief that ions were decisively important for nucleic-acid structure. Double Helix 1968-02-27T00:00:00Z Admittedly there was no evidence that Rosy’s samples contained any divalent ions, and so we might be sticking our necks out. Double Helix 1968-02-27T00:00:00Z The only new result we were likely to pick up before Christmas was the divalent metal content of the DNA- containing phage T4. Double Helix 1968-02-27T00:00:00Z All our speculations about whether divalent ions held the chains together would have made no sense if there were hydrogen atoms firmly bound to the phosphates. Double Helix 1968-02-27T00:00:00Z The carbonate ion concentration is gradually increased in a solution containing equal concentrations of the divalent cations of magnesium, calcium, strontium, barium, and manganese. Chemistry 2019-02-14T00:00:00Z Such conditions are often difficult to model in the laboratory, where competence can be induced by high concentrations of divalent cations, Ca+2 or Mg+2, or electrical shock. Biology for AP Courses 2022-06-09T00:00:00Z The tetrahedral chains continue to left and right and each is interspersed with a series of divalent cations. Physical Geology 2015-01-01T00:00:00Z The adjective monovalent, divalent, trivalent, etc., is prefixed to an element to denote that the atom of this element combines with one, or two, or three, etc., atoms of hydrogen to form a compound molecule. Heroes of Science Chemists 2011-12-09T03:00:21.047Z Each monovalent ion must therefore be associated with a certain definite charge, which we may take to be a natural unit of electricity; a divalent ion carries two such units, and so on. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" Unlike most salts of the alkali metals, many of the common salts of the alkaline earth metals are insoluble in water because of the high lattice energies of these compounds, containing a divalent metal ion. Chemistry 2019-02-14T00:00:00Z In these salts X = NO2 and M = one atomic proportion of a monovalent metal, or the equivalent quantity of a divalent metal. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" In olivine, it takes two divalent cations to balance the –4 charge of an isolated tetrahedron. Physical Geology 2015-01-01T00:00:00Z Group I.: the alkali metals Li, Na, K, Rb, Cs, and also Ag, monovalent; Cu, monovalent and divalent; Au, monovalent and trivalent. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" But if a divalent atom is in question the charge carried is double, and, similarly, a trivalent atom carries a triple charge. A History of Science, Volume 5(of 5) Aspects Of Recent Science Tin and lead form the stable divalent cations, Sn2+ and Pb2+, with oxidation states two below the group oxidation state of 4+. Chemistry 2019-02-14T00:00:00Z The elements are divalent in almost all of their compounds, and these compounds in solution give simple, divalent, colorless ions. An Elementary Study of Chemistry The oxygen atom, being divalent, is capable of uniting itself to two other atoms of oxygen or other elements, and thus with oxygen forming ozone. Scientific American Supplement, No. 794, March 21, 1891 C, Si, Ge, Zr, Th, tetravalent; Ti, tetravalent and hexavalent; Sn, Pb, divalent and tetravalent; Ce, trivalent and tetravalent. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" It is almost the only definitely known compound in which carbon seems to be divalent. The Gutenberg Webster's Unabridged Dictionary Section C The words monovalent, divalent, trivalent, tretrava-lent, etc., were coined to express this most important fact, and the various elements came to be known as monads, diads, triads, etc. A History of Science — Volume 4 In the one series the iron is divalent and forms compounds which in formulas and many chemical properties are similar to the corresponding zinc compounds. An Elementary Study of Chemistry Copper, like iron, forms two series of compounds: in the cuprous compounds it is univalent; in the cupric it is divalent. An Elementary Study of Chemistry Group V.: N, trivalent and pentavalent, but divalent in nitric oxide; P, As, Sb, Bi, trivalent and pentavalent, the last being possibly divalent in BiO and BiCl2. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" Those compounds in which the iron is divalent are known as ferrous compounds, while those in which it is trivalent are known as ferric. An Elementary Study of Chemistry Elements such as oxygen, calcium, and zinc, which can combine with two atoms of hydrogen or other univalent elements, are said to be divalent. An Elementary Study of Chemistry In the one series, designated by the suffix "ous," the metal is divalent; in the other series, designated by the suffix "ic," the metal is trivalent. An Elementary Study of Chemistry That it may also be divalent in H2O2 may be made clear as follows: The unit valence of each element may be represented graphically by a line attached to its symbol. An Elementary Study of Chemistry In many cases it may be connected with basic oxygen, and the salt formation is assumed to involve the passage of divalent into tetravalent oxygen. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" Univalent hydrogen and divalent oxygen will then have the symbols H- and -O-. An Elementary Study of Chemistry The oxygen in the compound is therefore divalent, just as it is in water. An Elementary Study of Chemistry In the other series the metals are divalent and resemble magnesium salts in formulas. An Elementary Study of Chemistry A divalent element, on the other hand, will combine with two atoms of a univalent element. An Elementary Study of Chemistry One atom of divalent zinc will replace 2 hydrogen atoms, so that the corresponding zinc salts will be ZnCl2 and ZnSO4. An Elementary Study of Chemistry The members of this group are divalent in nearly all their compounds, so that the formulas of their salts resemble those of the alkaline-earth metals. An Elementary Study of Chemistry |
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