scholarly journals Deactivation of Sn-Beta zeolites caused by structural transformation of hydrophobic to hydrophilic micropores during aqueous-phase glucose isomerization

2019 ◽  
Vol 9 (7) ◽  
pp. 1654-1668 ◽  
Author(s):  
Michael J. Cordon ◽  
Jacklyn N. Hall ◽  
James W. Harris ◽  
Jason S. Bates ◽  
Son-Jong Hwang ◽  
...  
Keyword(s):  
Aqueous Phase ◽  
Structural Transformation ◽  
Kinetic Methods ◽  
Beta Zeolites ◽  
Spectroscopic Titration ◽  
Glucose Isomerization

Spectroscopic, titration and kinetic methods were used to probe the deactivation of Sn-Beta in water.

Titration and quantification of open and closed Lewis acid sites in Sn-Beta zeolites that catalyze glucose isomerization

2016 ◽  
Vol 335 ◽  
pp. 141-154 ◽  
Author(s):  
James W. Harris ◽  
Michael J. Cordon ◽  
John R. Di Iorio ◽  
Juan Carlos Vega-Vila ◽  
Fabio H. Ribeiro ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Beta Zeolites ◽  
Glucose Isomerization

Discussing the performance of beta zeolites in aqueous-phase valorization of xylose

2020 ◽  
Vol 10 (21) ◽  
pp. 7165-7176
Author(s):  
Tiago L. Coelho ◽  
Bruna Marinho ◽  
Elise M. Albuquerque ◽  
Marco A. Fraga
Keyword(s):  
Aqueous Phase ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Beta Zeolites ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites

Beta zeolites are potential catalysts for xylose upgrade to bioproducts and selectivity is determined by the balance between water-tolerant Lewis and Brønsted acid sites.

Solid State NMR Characterization of Sn-Beta Zeolites that Catalyze Glucose Isomerization and Epimerization

2015 ◽  
Vol 58 (7-9) ◽  
pp. 435-440 ◽  
Author(s):  
Son-Jong Hwang ◽  
Rajamani Gounder ◽  
Yashodhan Bhawe ◽  
Marat Orazov ◽  
Ricardo Bermejo-Deval ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Beta Zeolites ◽  
Nmr Characterization ◽  
Glucose Isomerization

The structure of pre-mRNA and mRNA from erythroid cells

1978 ◽  
Vol 36 (2) ◽  
pp. 234-235
Author(s):  
A.-M. Ladhoff ◽  
B.J. Thiele ◽  
Ch. Coutelle ◽  
S. Rosenthal
Keyword(s):  
Bone Marrow ◽  
Structural Transformation ◽  
Electron Micrographs ◽  
Ammonium Acetate ◽  
Bone Marrow Cells ◽  
Erythroid Cells ◽  
Globin Mrna ◽  
Ordered Structures ◽  
Rabbit Bone ◽  
Rabbit Reticulocytes

The suggested precursor-product relationship between the nuclear pre-mRNA and the cytoplasmic mRNA has created increased interest also in the structure of these RNA species. Previously we have been published electron micrographs of individual pre-mRNA molecules from erythroid cells. An intersting observation was the appearance of a contour, probably corresponding to higher ordered structures, on one end of 10 % of the pre-mRNA molecules from erythroid rabbit bone marrow cells (Fig. 1A). A virtual similar contour was observed in molecules of 9S globin mRNA from rabbit reticulocytes (Fig. 1B). A structural transformation in a linear contour occurs if the RNA is heated for 10 min to 90°C in the presence of 80 % formamide. This structural transformation is reversible when the denatured RNA is precipitated and redissolved in 0.2 M ammonium acetate.

Structural Transformation of a Germanium Σ=13 (510) [001] Tilt Grain Boundary under the Electron Beam

1990 ◽  
Vol 48 (1) ◽  
pp. 52-53 ◽  
Author(s):  
Jean-Luc Rouvière ◽  
Alain Bourret
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Grain Boundary ◽  
Structural Transformation ◽  
Mirror Symmetry ◽  
High Resolution Electron Microscopy ◽  
Structural Transformations ◽  
Covalent Bonds ◽  
Resolution Electron ◽  
Tilt Grain Boundary

The possible structural transformations during the sample preparations and the sample observations are important issues in electron microscopy. Several publications of High Resolution Electron Microscopy (HREM) have reported that structural transformations and evaporation of the thin parts of a specimen could happen in the microscope. Diffusion and preferential etchings could also occur during the sample preparation.Here we report a structural transformation of a germanium Σ=13 (510) [001] tilt grain boundary that occurred in a medium-voltage electron microscopy (JEOL 400KV).Among the different (001) tilt grain boundaries whose atomic structures were entirely determined by High Resolution Electron Microscopy (Σ = 5(310), Σ = 13 (320), Σ = 13 (510), Σ = 65 (1130), Σ = 25 (710) and Σ = 41 (910), the Σ = 13 (510) interface is the most interesting. It exhibits two kinds of structures. One of them, the M-structure, has tetracoordinated covalent bonds and is periodic (fig. 1). The other, the U-structure, is also tetracoordinated but is not strictly periodic (fig. 2). It is composed of a periodically repeated constant part that separates variable cores where some atoms can have several stable positions. The M-structure has a mirror glide symmetry. At Scherzer defocus, its HREM images have characteristic groups of three big white dots that are distributed on alternatively facing right and left arcs (fig. 1). The (001) projection of the U-structure has an apparent mirror symmetry, the portions of good coincidence zones (“perfect crystal structure”) regularly separate the variable cores regions (fig. 2).

STRUCTURAL TRANSFORMATION STUDIED BY THERMAL EXPANSION ON SINGLE CRYSTALS V3Si IN NORMAL AND SUPERCONDUCTING STATES

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-406-C6-407 ◽  
Author(s):  
T. Fukase ◽  
T. Kobayashi ◽  
M. Isino ◽  
N. Toyota ◽  
Y. Muto
Keyword(s):  
Thermal Expansion ◽  
Single Crystals ◽  
Structural Transformation

Between Modernization and Stagnation: Economic Policy in 2012

2013 ◽  
pp. 4-23 ◽  
Author(s):  
V. Mau
Keyword(s):  
Economic Policy ◽  
Economic Development ◽  
Russian Economic Development ◽  
Structural Transformation ◽  
Economic Performance ◽  
Historical Analysis ◽  
Oil Boom ◽  
The World

The paper deals with the trends in the world and Russian economies towards development of a new post-crisis system, including technological and structural transformation. Three main scenarios of Russian economic development (conservative, innovation and acceleration) are discussed basing on historical analysis of Russian economic performance since 1970-s when oil boom started. On this basis key challenges of economic policy in 2013 are discussed.

From universalism to individualism: New approaches to economic growth analysis

2019 ◽  
pp. 108-126
Author(s):  
Ivan L. Lyubimov
Keyword(s):  
Economic Growth ◽  
Structural Transformation ◽  
Emerging Economies ◽  
Growth Analysis ◽  
Extended Period ◽  
Economic Policies ◽  
Adequate Account ◽  
New Approaches ◽  
Catching Up

This paper examines the evolution of academic and applied approaches to analyze the problem of economic growth since the mid-XX century. For quite an extended period of time, these views were corresponding to universalist economic policies taking no adequate account of particularities and limitations that a certain catching-up economy embodied. New approaches analyzing the problems of economic growth, on the contrary, individualize growth diagnostics, structural transformation and the organization of reforms processes for the emerging economies. We argue that individualist approaches might be potentially more effective than the universalist ones for solving the problem of slow economic growth.

Anti-crisis measures or structural reforms: Russia’s economic policy in 2015

2016 ◽  
pp. 5-33 ◽  
Author(s):  
V. Mau
Keyword(s):  
Economic Growth ◽  
Economic Policy ◽  
Structural Transformation ◽  
Growth Model ◽  
Emerging Economies ◽  
Social Issues ◽  
Import Substitution ◽  
Structural Reforms ◽  
Energy Prices ◽  
New Models

The paper deals with 2015 trends and challenges for social and economic policy in the nearest future. The analysis of global crisis includes: uneven developments in the leading advanced and emerging economies; new models of economic growth which look differently in different countries; prospects of globalization and challenges of ‘regional globalization’; currency configurations of the future; energy prices dynamics and its influence on political and economic prospects of particular states. Current challenges are discussed in the context of previous 30 years. Among the main topics on Russia, there are approaches to a new growth model, structural transformation (including import substitution issues), economic dynamics, budget and monetary outlines, social issues. The priorities of economic policy are also considered.

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