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141.
Pickett CJ Vincent KA Ibrahim SK Gormal CA Smith BE Fairhurst SA Best SP 《Chemistry (Weinheim an der Bergstrasse, Germany)》2004,10(19):4770-4776
The first electrochemical and infra-red data on the binding of cyanide to the isolated iron-molybdenum cofactor of nitrogenase, FeMoco, is described. It is shown that cyanide stabilises a hitherto unrecognised, low-spin, EPR-active (S= 1/2), superoxidised form of FeMoco, and we provide the first evidence that carbon monoxide and cyanide bind synergically to the oxidised and semireduced states of the isolated cofactor, states which are unreactive to carbon monoxide alone. 相似文献
142.
The quasilinear bands in the topologically trivial skutterudite insulator CoSb(3) are studied under adiabatic, symmetry-conserving displacement of the Sb sublattice. In this cubic, time-reversal and inversion symmetric system, a transition from trivial insulator to topological point Fermi surface system occurs through a critical point in which massless (Dirac) bands appear, and moreover are degenerate with massive bands. Spin-orbit coupling, while small due to the type of band character, coupled with tetragonal strain opens the gap required to give the topological insulator. The mineral skutterudite (CoSb(3)) is very near the critical point in its natural state. 相似文献
143.
J. Joshua Yang John Paul Strachan Feng Miao Min-Xian Zhang Matthew D. Pickett Wei Yi Douglas A. A. Ohlberg G. Medeiros-Ribeiro R. Stanley Williams 《Applied Physics A: Materials Science & Processing》2011,102(4):785-789
The interfaces between metal electrodes and the oxide in TiO2-based memristive switches play a key role in the switching as well as in the I–V characteristics of the devices in different resistance states. We demonstrate here that the work function of the metal electrode
has a surprisingly minor effect in determining the electronic barrier at the interface. In contrast, Ti oxides can be readily
reduced by most electrode metals. The amount of oxygen vacancies created by these chemical reactions essentially determines
the electronic barrier at the device interfaces. 相似文献
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James E. Pickett 《Journal of polymer science. Part A, Polymer chemistry》2017,55(14):2318-2331
Reinvestigation of poly(2,6‐dimethyl‐1,4‐phenylene oxide) photodegradation at wavelengths > 290 nm shows that both methyl groups and aromatic rings are sites of oxidation with their relative rates dependent on exposure conditions, based on infrared spectroscopy. The methyl group loss is linear with exposure and apparently proceeds by direct abstraction of a benzylic hydrogen by oxygen. The aromatic ring loss and carbonyl growth in the IR spectra appear to be auto‐accelerating and seem to proceed by electron transfer to oxygen, either sensitized or through a direct reaction with oxygen, and recombination of the polymer radical cation and superoxide to result in oxygen addition to the ring. Molecular weight loss in solution occurs to a significant degree only in the presence of oxygen, even in the presence of a hydrogen‐donating solvent, indicating that aryl ether photolysis is not a major pathway. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55, 2318–2331 相似文献
147.
Dr. Suzanne J. Partridge Dr. David M. Withall Dr. John C. Caulfield Prof. John A. Pickett Prof. Robert A. Stockman Prof. Neil J. Oldham Dr. Michael A. Birkett 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(25):7231-7234
Biosynthesis of (1R,4aS,7S,7aR)-nepetalactol ( 1 ) and (4aS,7S,7aR)-nepetalactone ( 2 ) in plants involves iridoid synthase (ISY), an atypical reductive cyclase that catalyses the reduction of 8-oxogeranial into the reactive enol of (S)-8-oxocitronellal, and cyclization of this enol intermediate, either non-enzymatically or by a nepetalactol-related short chain dehydrogenase enzyme (NEPS) that yields the nepetalactols. In this study, we investigated the biosynthesis in vivo of 1 and 2 in the pea aphid, Acyrthosiphon pisum, using a library of isotopically-labelled monoterpenoids as molecular probes. Topical application of deuterium-labelled probes synthesized from geraniol and nerol resulted in production of 2H4−lactol 1 and 2H4−lactone 2 . However, deuterium incorporation was not evident using labelled probes synthesized from (S)-citronellol. These results suggest that iridoid biosynthesis in animals, specifically aphids, may follow a broadly similar route to that characterised for plants. 相似文献
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149.
J. W. Stoddard O. A. Pickett C. J. Cicero und J. H. Saunders 《Colloid and polymer science》1977,255(6):624
Ohne Zusammenfassung 相似文献
150.