Molecular structure-reactivity relationships in n-butane oxidation over bulk VPO and supported vanadia catalysts: Lessons for molecular engineering of new selective catalysts for alkane oxidation

2000 ◽  
pp. 1721-1726 ◽  
Author(s):  
V.V. Guliants ◽  
J.B. Benziger ◽  
S. Sundaresan ◽  
I.E. Wachs
Keyword(s):  
Molecular Structure ◽  
Molecular Engineering ◽  
Alkane Oxidation ◽  
Butane Oxidation ◽  
Vanadia Catalysts

scholarly journals Fundamental Studies of Butane Oxidation over Model-Supported Vanadium Oxide Catalysts: Molecular Structure-Reactivity Relationships

1997 ◽  
Vol 170 (1) ◽  
pp. 75-88 ◽  
Author(s):  
Israel E. Wachs ◽  
Jih-Mirn Jehng ◽  
Goutam Deo ◽  
Bert M. Weckhuysen ◽  
V.V. Guliants ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Vanadium Oxide ◽  
Oxide Catalysts ◽  
Butane Oxidation

Mono and oligonuclear vanadium complexes as catalysts for alkane oxidation: synthesis, molecular structure, and catalytic potential

2004 ◽  
Vol 357 (2) ◽  
pp. 475-484 ◽  
Author(s):  
Georg Süss-Fink ◽  
Laura Gonzalez Cuervo ◽  
Bruno Therrien ◽  
Helen Stoeckli-Evans ◽  
Georgiy B Shul’pin
Keyword(s):  
Molecular Structure ◽  
Alkane Oxidation ◽  
Vanadium Complexes ◽  
Catalytic Potential ◽  
Oxidation Synthesis

Molecular Structure of the Outermost Cell Wall Component of Spirillum Serpens

1977 ◽  
Vol 35 ◽  
pp. 342-343
Author(s):  
Wah Chiu ◽  
David Grano
Keyword(s):  
Molecular Structure ◽  
Cell Wall ◽  
Outer Membrane ◽  
Gel Electrophoresis ◽  
Electron Microscopic Examination ◽  
Electron Microscopic ◽  
Cell Wall Component ◽  
Protein Components ◽  
Exposure Technique ◽  
Structural Aspects

The periodic structure external to the outer membrane of Spirillum serpens VHA has been isolated by similar procedures to those used by Buckmire and Murray (1). From SDS gel electrophoresis, we have found that the isolated fragments contain several protein components, and that the crystalline structure is composed of a glycoprotein component with a molecular weight of ∽ 140,000 daltons (2). Under an electron microscopic examination, we have visualized the hexagonally-packed glycoprotein subunits, as well as the bilayer profile of the outer membrane. In this paper, we will discuss some structural aspects of the crystalline glycoproteins, based on computer-reconstructed images of the external cell wall fragments.The specimens were prepared for electron microscopy in two ways: negatively stained with 1% PTA, and maintained in a frozen-hydrated state (3). The micrographs were taken with a JEM-100B electron microscope with a field emission gun. The minimum exposure technique was essential for imaging the frozen- hydrated specimens.

Fluorescence ratio imaging of dynamic intracellular ionic signals

1988 ◽  
Vol 46 ◽  
pp. 42-43
Author(s):  
R. Y. Tsien ◽  
A. Minta ◽  
M. Poenie ◽  
J.P.Y. Kao ◽  
A. Harootunian
Keyword(s):  
Binding Sites ◽  
Living Cells ◽  
Molecular Engineering ◽  
Ph Indicators ◽  
Highly Sensitive ◽  
Fluorescence Ratio Imaging ◽  
Ratio Imaging ◽  
Technical Advances ◽  
Indicator Dyes ◽  
Fluorescein Dyes

Recent technical advances now enable the continuous imaging of important ionic signals inside individual living cells with micron spatial resolution and subsecond time resolution. This methodology relies on the molecular engineering of indicator dyes whose fluorescence is strong and highly sensitive to ions such as Ca2+, H+, or Na+, or Mg2+. The Ca2+ indicators, exemplified by fura-2 and indo-1, derive their high affinity (Kd near 200 nM) and selectivity for Ca2+ to a versatile tetracarboxylate binding site3 modeled on and isosteric with the well known chelator EGTA. The most commonly used pH indicators are fluorescein dyes (such as BCECF) modified to adjust their pKa's and improve their retention inside cells. Na+ indicators are crown ethers with cavity sizes chosen to select Na+ over K+: Mg2+ indicators use tricarboxylate binding sites truncated from those of the Ca2+ chelators, resulting in a more compact arrangement of carboxylates to suit the smaller ion.

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