Now showing items 61-70 of 126
Application of affinity adsorption in thienamycin fermentation
(Springer-Verlag, 1989-02)
Many antibiotic fermentations are sensitive to high concentrations of their own product possibly due to product regulation and toxicity mechanisms. In this paper we discuss the feasibility of using affinity adsorption with ...
Transient measurement of dissolved oxygen using membrane electrodes
(Elsevier, 1989)
Transient mode dissolved oxygen measurement has been studied using a specially constructed galvanic membrane electrode controlled by a microcomputer. A four-layer diffusion model was developed to describe the dynamic ...
Pore evolution and channel formation during flow and reaction in porous media
(American Institute of Chemical EngineersWiley Periodiocals, Inc., 1988-01)
A theoretical and experimental study on the dissolution of porous media by flowing acid has been carried out. Dissolution of the media results in an evolution of the pore geometry and the formation of random flow channels. ...
Adsorption-induced conductance changes of thin Pt films and PtPd/TiO2 gas sensors
(Elsevier, 1987-11)
Chemisorption of H2 and O2 and resulting changes in electrical conductance of a typical gas sensing material, PtPd/TiO2, and thin Pt films on glass are studied and compared. The activation energy of conduction increases ...
Fischer-Tropsch synthesis on bimetallic ruthenium-gold catalysts
(Elsevier, 1985-06)
The effect of Au in the behavior of Ru as a Fischer-Tropsch catalyst was studied. Two series of catalysts were investigated, one supported on SiO2 and the other on MgO. Au did not seem to alter the product distribution on ...
TPR Investigation of bimetallic Ru-Cu samples supported on SiO 2 , Al 2 O 3 and MgO
(Kluwer Academic Publishers; Wiley Heyden Ltd., Chichester and Akadémiai Kiadó, Budapest ; Springer Science+Business Media, 1987-03)
Bimetallic Ru-Cu samples supported on SiO 2 , Al 2 O 3 and MgO were studied by the temperature-programmed reduction (TPR) technique. Experiments were carried out both on unreduced impregnated salts and after oxidation of ...
COMMENT: Comment on 'sum rules for quantum billiards'
(IOP Publishing Ltd, 1986-12-21)
Based on work of Itzykson et al., see ibid., vol.19, no.3, p.L111-16 (1986). For a d-dimensional rectangular box the function zeta (T;s) considered by Itzykson et al. is related to Epstein's zeta function and can be written ...
The efficient determination of the percolation threshold by a frontier-generating walk in a gradient
(IOP Publishing Ltd, 1986-12-21)
The frontier in gradient percolation is generated directly by a type of self-avoiding random walk. The existence of the gradient permits one to generate an infinite walk on a computer of finite memory. From this walk, the ...
The existence of a critical salt concentration for particle release
(Elsevier, 1984-09)
A critical salt concentration (CSC) was found to exist in the water sensitivity of Berea sandstone. If the salinity of the permeating fluid falls below the CSC, the sandstone permeability is significantly reduced as a ...
Protein release from Escherichia coli cells permeabilized with guanidine–HCl and Triton X100
(Wiley Subscription Services, Inc., A Wiley Company, 1989-02-20)
An important factor complicating the recovery of recombinant proteins from Escherichia coli is their intracellular location. An alternative to the commonly used method of releasing these proteins by mechanical disruption ...