Modification of silica surfaces by grafting of alkyl chains. II-Characterization of silica surfaces by inverse gas-solid chromatography at finite concentration

1987 ◽  
Vol 23 (4) ◽  
pp. 279-285 ◽  
Author(s):  
E. Papirer ◽  
A. Vidal ◽  
Wang Meng Jiao ◽  
J. B. Donnet
Keyword(s):  
Alkyl Chains ◽  
Silica Surfaces ◽  
Finite Concentration

scholarly journals Crystal structure of thermostable alkylsulfatase SdsAP from Pseudomonas sp. S9

2017 ◽  
Vol 37 (3) ◽  
Author(s):  
Lifang Sun ◽  
Pu Chen ◽  
Yintao Su ◽  
Zhixiong Cai ◽  
Lingwei Ruan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Sodium Dodecyl ◽  
Titration Calorimetry ◽  
Pseudomonas Sp ◽  
Sterol Carrier Protein ◽  
Dimerization Domain ◽  
Alkyl Chains ◽  
Hydrolysis Of

A novel alkylsulfatase from bacterium Pseudomonas sp. S9 (SdsAP) was identified as a thermostable alkylsulfatases (type III), which could hydrolyze the primary alkyl sulfate such as sodium dodecyl sulfate (SDS). Thus, it has a potential application of SDS biodegradation. The crystal structure of SdsAP has been solved to a resolution of 1.76 Å and reveals that SdsAP contains the characteristic metallo-β-lactamase-like fold domain, dimerization domain, and C-terminal sterol carrier protein type 2 (SCP-2)-like fold domain. Kinetic characterization of SdsAP to SDS by isothermal titration calorimetry (ITC) and enzymatic activity assays of constructed mutants demonstrate that Y246 and G263 are important residues for its preference for the hydrolysis of ‘primary alkyl’ chains, confirming that SdsAP is a primary alkylsulfatase.

Characterization of immobilized antibodies on silica surfaces

1988 ◽  
Vol 35 (6) ◽  
pp. 466-471 ◽  
Author(s):  
Jinn-Nan Lin ◽  
J. Herron ◽  
J.D. Andrade ◽  
M. Brizgys
Keyword(s):  
Silica Surfaces ◽  
Immobilized Antibodies

Filler-Elastomer Interactions. Part VI. Characterization of Carbon Blacks by Inverse Gas Chromatography at Finite Concentration

1992 ◽  
Vol 65 (5) ◽  
pp. 890-907 ◽  
Author(s):  
Meng-Jiao Wang ◽  
Siegfried Wolff
Keyword(s):  
Gas Chromatography ◽  
Energy Distribution ◽  
Inverse Gas Chromatography ◽  
General Trend ◽  
High Energy ◽  
Carbon Blacks ◽  
Finite Concentration ◽  
Good Agreement

Abstract Carbon blacks ranging from N110 to N990 were characterized by means of inverse gas chromatography at finite concentration. The isotherms, net heat, and spreading pressures for benzene and cyclohexane adsorption suggest a general trend of increasing surface activity with increases in specific surface area. This is in good agreement with surface-energy measurements reported previously. The energy-distribution function of adsorption shows that while the concentrations of low-energy sites are comparable for most of the carbon blacks, differences exist with regard to high-energy sites. These suggest that small-particle-size blacks possess a greater number of high-energy centers. The graphitization of carbon blacks results in a considerable reduction in their adsorption capacity and narrows the energy distribution of their surfaces. One can therefore conclude that high-energy sites play an important role in the determination of the surface energies and reinforcing ability of carbon blacks.

Chromatographic characterization of silica surfaces

1981 ◽  
Vol 218 ◽  
pp. 395-407 ◽  
Author(s):  
Heinz Engelhardt ◽  
Hartmut Müller
Keyword(s):  
Silica Surfaces ◽  
Chromatographic Characterization

Physicochemical Characterization of Tetraether Lipids from Thermoplasma acidophilum. II. Film Balance Studies on the Monomolecular Organization of the Main Glycophospholipid in Monofilms

1985 ◽  
Vol 40 (3-4) ◽  
pp. 219-222 ◽  
Author(s):  
Christoph Strobl ◽  
Lambert Six ◽  
Klaus Heckmann ◽  
Birgit Henkel ◽  
Klaus Ring
Keyword(s):  
Surface Pressure ◽  
High Surface ◽  
Physicochemical Characterization ◽  
Thermoplasma Acidophilum ◽  
Alkyl Chains ◽  
Head Groups ◽  
Air Water Interface ◽  
Tetraether Lipids ◽  
High Surface Pressure

The bipolar main tetraether lipid (MPL) of Thermoplasma acidophilum has been shown to form typical liquid expanded films at the air-water interface. The limiting molecular area at the collaps pressure is approximately Ac=73 Å2 per molecule. Monopolar aiphytanyl diether lipids were found to occupy the same area at high surface pressure as MPL. Thus, it was concluded that in the monofilm only one of the two polar headgroups of the MPL molecules is hydrated, i.e. that the single MPL molecules arc oriented upright. The packing properties of MPT. in the monofilm are determined by the properties of the branched alkyl chains only; the polar head groups do not contribute to the space requirement in the film. The collaps pressure of the MPL film is approximately 39 mN m-1 at 8°C. At a surface pressure of π = 30 mN m-1 and 20 °C the film is stable for many hours.

Synthesis and characterization of immobilized dendritic silica surfaces

2002 ◽  
Vol 5 (1) ◽  
pp. 67-77 ◽  
Author(s):  
George R. Newkome ◽  
Kyung Soo Yoo ◽  
Charles N. Moorefield
Keyword(s):  
Synthesis And Characterization ◽  
Silica Surfaces
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