Reduction of variation in the gasoline blending process —A case study

In an attempt to reduce the release of gasoline vapors into the atmosphere, the U.S. Environmental Protection Agency (EPA) has placed restrictions on the volatility of commercial gasoline. In particular, they have set an upper specification limit on the gasoline's volatility as measured by the Reid vapor pressure (RVP). Exceeding the EPA's upper specification limit may result in a fine to the refiner. While there is no lower specification limit imposed by the EPA, lower RVP values require greater production costs. This article describes the efforts of one refiner to meet the EPA requirements with minimum economic disbenefit. Various statistical tools were used during this effort. The paper demonstrates a variety of successful SPC applications in the continuous process industry.     

Identification of group VS116 strains among Borrelia burgdorferi sensu lato grown from the hard tick, Ixodes ricinus (Linnaeus, 1758) by off-coupled restriction fragment length polymorphism analysis

The degree of chemical shift similarity for homologous proteins has been determined from a chemical shift database of over 50 proteins representing a variety of families and folds, and spanning a wide range of sequence homologies. After sequence alignment, the similarity of the secondary chemical shifts of C alpha protons was examined as a function of amino acid sequence identity for 37 pairs of structurally homologous proteins. A correlation between sequence identity and secondary chemical shift rmsd was observed. Important insights are provided by examining the sequence identity of homologous proteins versus percentage of secondary chemical shifts that fall within 0.1 and 0.3 ppm thresholds. These results begin to establish practical guidelines for the extent of chemical shift similarity to expect among structurally homologous proteins.     

Veranstaltungsbesprechung

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Veranstaltungsbesprechungen

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Die bei beginnender Fleischf?ulnis auftretenden chemischen und physiko-chemischen Ver?nderungen

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Referate

Ohne ZusammenfassungIn die Zusammenstellung der Referate sind auch die Originalmitteilungen nochmals aufgenommen und durch Kursiv-Typen der Seitenzahlen kenntlich gemacht.     

Milch und K?se

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Statics and dynamics of the vortex lattice in high-T c superconductors

Some properties of the flux-line lattice in conventional and high-T_c supperconductors are reviewed, with particular stress on phenomenological theories, magnetization curves, vortex lattice in films, nonlocal elasticity, phase diagram of vortex arrangements, vortex dynamics, and geometry effects.