isoelectronic


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isoelectronic

[¦ī·sō·i‚lek′trän·ik]
(atomic physics)
Pertaining to atoms having the same number of electrons outside the nucleus of the atom.
References in periodicals archive ?
(39) made an isoelectronic comparison of measured and calculated radiative lifetimes of the 5s5p [.sup.1][P.[degrees].sub.1] and 5s5p [.sup.3][P.[degrees].sub.1] levels for Cd-like spectra of elements between Cd and Ho.
The isoelectronic, photostable N-ethyl derivative was obtained by direct alkylation of the parent heterocycle.
1968): 151-53; Nick Holonyak Jr., et al., "Stimulated Emission Involving the Nitrogen Isoelectronic Trap in Ga[As.sub.1-x][P.sub.x]," Applied Physics Letters 19 (Oct.
NO has been reported to inhibit methionine synthase activity in vitro [6-8], it might be expected to bind to the cobalt in cobalamin because (i) NO binds tightly to the iron in heme; (ii) ferrous heme and cbl (III) are isoelectronic; and (iii) in both heme and cobalamin, the metal ion is coordinated to four in-plane nitrogen atoms of a tetrapyrrole ring and has two out-of-plane ligands [2].
NO has been reported to inhibit methionine synthase activity in vitro (37-39), and it might be expected to bind to the cobalt in cobalamin because, first, NO binds tightly to the iron in heme (40); second, ferrous heme and cbl(III) are isoelectronic; and third, in both heme and cobalamin, the metal ion is coordinated to four in-plane nitrogen atoms of a tetrapyrrole ring and has two out-of-plane ligands (41).
Note that [S.sub.2][[I.sub.4.sup.2+] is isoelectronic to [P.sub.2][I.sub.4], which contains a P-P single bond, so the expected S-S bond order was one.
Oxon derivatives 2 and 4 (Table 1) are isoelectronic to fenitrothion 1 and methylparathion 3, respectively, and would be expected to react similarly, and yet these derivatives showed no antiandrogenic activity at the highest concentration tested ([10.sub.-5] M).
It is isoelectronic with cyanide and disrupts oxidative metabolism in a similar manner.
Water's truly special status is highlighted in Figure 3, which compares properties of the so-called isoelectronic series [H.sub.4]C, [H.sub.3]N, [H.sub.2]O, HF, and Ne (Taylor 1966).
The isocyanate group has several isoelectronic structures shown in figure 2.
An increase in ZT by isoelectronic impurities (Si) and hydrogen adsorption was also observed owing to the similar reason.
The term "isosteres" was defined for the first time (1919) by Langmuir in terms of isoelectronic or isosteric concept [6, 20] and thus emerged the concept of isosterism .