Now showing items 11-20 of 24
Model studies of lantibiotic biogenesis
(Elsevier, 1993-12-03)
A six residue polypeptide has been synthesized to study the proposed biosynthesis of lanthionine. It is shown that this peptide spontaneously cyclizes in a biomimetic fashion via a completely stereoselective intramolecular ...
Order-disorder transitions at and segregation to (001) Ni-Pt surfaces
(Elsevier, 1993-04-20)
Order-disorder transitions at and segregation to the (001) surface of Ni-Pt alloys have been investigated by a recently developed free energy simulation method, where the atomic interactions are described using the embedded ...
Interfacial segregation in Ag-Au, Au-Pd, and Cu-Ni alloys: I. (100) surfaces
(Kluwer Academic Publishers; Springer Science+Business Media, 1993-03)
Atomistic simulations of segregation to (100) free surface in Ag−Au, Au−Pd, and Cu−Ni alloy systems have been performed for a wide range of temperatures and compositions within the solid solution region of these alloy phase ...
Interfacial segregation in Ag-Au, Au-Pd, and Cu-Ni alloys: II. [001] Σ5 twist grain boundaries
(Kluwer Academic Publishers; Springer Science+Business Media, 1993-03)
Atomistic simulations of segregation to [001] Σ5 twist boundaries in Cu−Ni, Au−Pd, and Ag−Au alloy systems have been performed for a wide range of temperatures and compositions within the solid solution region of these ...
Manganese carbonyl complexes of 2,5-dimethylbismolyl. The crystal and molecular structure of ([eta]1-2,5-dimethylbismolyl) manganese pentacarbonyl
(Elsevier, 1993-04-06)
([eta]-1-2,5-Dimethylbismolyl)manganese pentacarbonyl (8) has been obtained from the reaction of 1-phenyl-2,5-dimethylbismole with lithium followed by BrMn(CO)5. Heating 8 to its melting point causes the loss of CO to ...
Studies of Fluorine in Catalysts with Ultrasoft X-Ray Absorption Spectroscopy
(Elsevier, 1993-08)
The structures of fluorine-doped alumina catalyst powders have been studied by fluorescence yield ultrasoft X-ray absorption spectroscopy. The results presented here demonstrate that important local structural information ...
Normal coordinate analysis of bilirubin vibrational spectra: Effects of intramolecular hydrogen bonding
(Elsevier, 1993-11)
Normal coordinate analyses are presented for half-bilirubin molecules. Calculations for the A---B pyrromethenone include intramolecular hydrogen bonds, while those for the C---D chromophore exclude intramolecular hydrogen ...
An STM study of molecular-beam epitaxy growth of GaAs
(Elsevier, 1993-01-10)
Scanning tunneling microscopy has been used to investigate molecular-beam epitaxy growth of GaAs. By quenching the sample during deposition, we have imaged the GaAs(001) surface as it appeared during growth. Large scale ...
The dynamical transition to step-flow growth during molecular-beam epitaxy of GaAs(00l)
(Elsevier, 1993-12-20)
Scanning tunneling microscopy studies have been performed on GaAs homoepitaxial films grown by molecular-beam epitaxy. Images show that in the earliest stages of deposition the morphology oscillates between one with ...
Synthesis of novel polyhydroxylated quinolizidines: Ring expanded analogs of glycosidase inhibitory indolizidines
(Elsevier, 1993-12-17)
Two polyhydroxylated quinolizidines, (1R,2R,3R,9S,9aR)-1,2,3,9-tetrahydroxyquinolizidine 9 and (1R,2R,3R,9R,9aS-1,2,3,9-tetrahydroxyquinolizidine 10, have been synthesized by the reductive double cyclization of 15[alpha] ...