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Functional and Spectroscopic Characterization of Chlamydomonas reinhardtii Truncated Hemoglobins
The single-cell green alga Chlamydomonas reinhardtii harbors twelve truncated hemoglobins (Cr-TrHbs). Cr-TrHb1-1 and Cr-TrHb1-8 have been postulated to be parts of the nitrogen assimilation pathway, and of a NO-dependent signaling pathway, respectively. Here, spectroscopic and reactivity properties of Cr-TrHb1-1, Cr-TrHb1-2, and Cr-TrHb1-4, all belonging to clsss 1 (previously known as group N ...
متن کاملKinetics and mechanism of the reduction of CrVI and CrV by D-lactobionic acid.
The oxidation of D-lactobionic acid by Cr(VI) yields the 2-ketoaldobionic acid and Cr(3+) as final products when a 20-times or higher excess of the aldobionic acid over Cr(VI) is used. The redox reaction takes place through a complex multistep mechanism, which involves the formation of intermediate Cr(IV) and Cr(V) species. Cr(IV) reacts with lactobionic acid much faster than Cr(V) and Cr(VI) d...
متن کاملSynthesis and crystal structures of the chromium(II) and chromium(III) hexafluoroacetylacetonate complexes trans-Cr(hfac)2(thf)2 and Cr(hfac)3
Treatment of a tetrahydrofuran solution of CrCl2(thf) with Na(hfac), hfac = 1,1,1,5,5,5-hexafluoroacetylacetonate, followed by crystallization from diethyl ether, affords the six-coordinate chromium(II) complex Cr(hfac)2(thf)2. The crystal structures of Cr(hfac)2(thf)2 and the chromium(III) complex Cr(hfac)3 have been determined by single-crystal X-ray diffraction. Cr(hfac)2(thf)2 adopts a tran...
متن کاملExtending Grazing In Heifer Development Systems Decreases CostWithout Compromising Production
Three experiments compared heifer development systems. In Exp. 1, 299 heifers (253 ± 2 kg) from 3 yr were used to compare dry lot (DL) to grazing corn residue (CR) post weaning. Heifers in the DL consumed a common diet after weaning for 187 d until breeding. The CR heifers grazed for 145 d with a supplement (0.45 kg/d; 28% CP) and were then fed in the DL until breeding. In Exp. 2, 270 heifers (...
متن کاملCytotoxicity studies of chromium(III) complexes on human dermal fibroblasts.
The cytotoxicity of certain Cr(III) complexes, such as [Cr(salen)(H(2)O)(2)](+), [Cr(edta)(H(2)O)](-), [Cr(en)(3)](3+), [Cr(ox)(3)](3-), [Cr(pic)(3)], and CrCl(3), which differ in ionic character and ligand environment in human dermal skin fibroblasts, has been studied. After 72 h of exposure to 100 microM doses of chromium(III) complexes, the order in which the complexes had an inhibitory effe...
متن کاملKinetics and mechanism of the reaction of ranitidine hydrochloride with trans-(diaqua)(N,N
The substitution reactions of [Cr(SALM)(OH2)2] + (SALM =N, N– ethylene–bis-salicylamide) and Cr(H2O)6 3+ with ranitidine hydrochloride, an antacid have been studied spectrophotometrically over the range 0.5 × 10 ≤ [Cr(III)complex]T ≤ 3 ×10, 3.6 ≤ pH ≤ 4.2, 25C ≤ t ≤ 45C and I = 0.5 mol dm [Cr(III)complex] = ([Cr (III)(SALM)(OH2)2] or [Cr(H2O)6] ]) . This reaction follows a mechanism which takes...
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