Now showing items 231-240 of 259
The role of extra-atomic relaxation in determining Si 2pSi2p binding energy shifts at silicon/silicon oxide interfaces
(The American Institute of Physics, 1997-09-01)
The observed binding energy shift for silicon oxide films grown on crystalline silicon varies as a function of film thickness. The physical basis of this shift has previously been ascribed to a variety of initial state ...
Evanescent luminescence and nanometer-size light source
(Elsevier, 1991)
Subwavelength light sources have been constructed with the aid of luminescent materials. These EXCITOR (exciton transmitted optical radiation) sources are of both theoretical and practical interest. The production of ...
Flavodoxin Is Required for the Activation of the Anaerobic Ribonucleotide Reductase
(Elsevier, 1993-12-15)
The inactive anaerobic ribonucleotide reductase from Escherichia coli is transformed by a multienzyme system and S-adenosylmethionine + NADPH into a radical protein that is enzymatically active. One of the activating enzyme ...
Progress in Practice: Can Undergraduate Student Affiliate Groups Survive After the (Re)Energizers Graduate?
(Springer-Verlag; Springer-Verlag New York, Inc., 1997-10)
The collective memory of the work of undergraduate student clubs is often fleeting, perhaps even more so than the memory of some academic faculty committees! Unlike fraternal organizations, with which members still identify ...
Polymers containing cyanoimidazole pendant groups
(John Wiley & Sons, Inc., 1990-08)
Dicyanoimidazole ( I ) was attached to a polystyrene backbone in order to prepare polymers containing electron-accepting pendant groups to complement the existing body of electron-donating polymers. The preparation of ...
Electric birefringence imaging of electrokinetic agarose orientation
(Wiley Subscription Services, Inc., A Wiley Company, 1991-08)
Time-resolved and steady-state electric birefringence imaging with a slow-scan video camera is used to study orientation during DNA agarose gel electrophoresis. The hydrodynamically induced gel distortion is shown to be ...
The diffusion-limited reaction A+B→0 on a fractal substrate
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1991-12)
We show in this paper how the segregation of reactants in the diffusion-limited reaction A+B→0 on a fractal substrate arises. For spectral dimensions d s ⩽ 2 we obtain segregation controlled by the source and/or the intrinsic ...
Sulfur speciation in heavy petroleums: Information from X-ray absorption near-edge structure
(Elsevier, 1991-03)
The chemical speciation of sulfur in heavy petroleums, petroleum source rock extracts, and source rock pyrolysis products was studied using X-ray absorption near-edge structure (XANES) spectroscopy. The good energy resolution ...
A continuous flow probe method for on‐line introduction of liquid samples for detection by laser desorption with resonant two‐photon ionization in supersonic beam mass spectrometry
(The American Institute of Physics, 1991-04)
A continuous flow probe is used as a direct inlet source for injection of liquid samples into a time‐of‐flight (TOF) mass spectrometer. The direct liquid inlet is coupled to laser desorption as a means of rapidly vaporizing ...
Investigations of Mn(pyr)(aq)+2 and pyridine intercalated Cd2P2S6 lattices: mechanism of intercalation and perturbation of the host lattice
(Elsevier, 1990-12-19)
The lamellar transition metal Chalocogeno-Phosphates (M2P2S6) form an important family of two-dimensional semiconducting materials. The lamellar structure is formed by stacking S-M-(P-P)-S units along a unique crystallographic ...