Influence of A-Site Variation and B-Site Substitution on the Physical Properties of (La,Sr)FeO3 Based Perovskites

Fuel Cells ◽  
2009 ◽  
Vol 9 (6) ◽  
pp. 899-906 ◽  
Author(s):  
U. F. Vogt ◽  
P. Holtappels ◽  
J. Sfeir ◽  
J. Richter ◽  
S. Duval ◽  
...  
Keyword(s):  
Physical Properties ◽  
Site Variation ◽  
A Site

A-Site-Ordered Perovskites with Intriguing Physical Properties

2008 ◽  
Vol 47 (19) ◽  
pp. 8562-8570 ◽  
Author(s):  
Yuichi Shimakawa
Keyword(s):  
Physical Properties ◽  
A Site

scholarly journals Pr3+ doping at the A-site of La0.67Ba0.33MnO3 nanocrystalline material: assessment of the relationship between structural and physical properties and Bean–Rodbell model simulation of disorder effects

RSC Advances ◽  
2019 ◽  
Vol 9 (44) ◽  
pp. 25627-25637 ◽  
Author(s):  
Ma. Oumezzine ◽  
Herbet Bezerra Sales ◽  
Ahmed Selmi ◽  
E. K. Hlil
Keyword(s):  
Physical Properties ◽  
Carrier Concentration ◽  
Nanocrystalline Material ◽  
Model Simulation ◽  
Pechini Method ◽  
Sol Gel ◽  
Disorder Effects ◽  
Bulk Nanocrystalline ◽  
A Site ◽  
The Relationship

Bulk nanocrystalline samples of (La1−xPrx)0.67Ba0.33MnO3 (0.075 ≤ x ≤ 0.30) manganites with a fixed carrier concentration are prepared by the sol–gel based Pechini method.

Effects of A-Site cation on the Physical Properties of Quaternary Perovskites AMn3V4O12 (A= Ca, Ce and Sm)

2020 ◽  
Vol 254 ◽  
pp. 123229
Author(s):  
Shahid Mehmood ◽  
Zahid Ali ◽  
Imad Khan ◽  
Iftikhar Ahmad
Keyword(s):  
Physical Properties ◽  
A Site

scholarly journals Modifying a covarying protein–DNA interaction changes substrate preference of a site-specific endonuclease

2019 ◽  
Vol 47 (20) ◽  
pp. 10830-10841 ◽  
Author(s):  
Marc Laforet ◽  
Thomas A McMurrough ◽  
Michael Vu ◽  
Christopher M Brown ◽  
Kun Zhang ◽  
...  
Keyword(s):  
Binding Sites ◽  
Gene Editing ◽  
Dna Interaction ◽  
Substrate Preference ◽  
Homing Endonucleases ◽  
Hairpin Loop ◽  
Dna Binding Sites ◽  
Target Sites ◽  
Site Variation ◽  
A Site

Abstract Identifying and validating intermolecular covariation between proteins and their DNA-binding sites can provide insights into mechanisms that regulate selectivity and starting points for engineering new specificity. LAGLIDADG homing endonucleases (meganucleases) can be engineered to bind non-native target sites for gene-editing applications, but not all redesigns successfully reprogram specificity. To gain a global overview of residues that influence meganuclease specificity, we used information theory to identify protein–DNA covariation. Directed evolution experiments of one predicted pair, 227/+3, revealed variants with surprising shifts in I-OnuI substrate preference at the central 4 bases where cleavage occurs. Structural studies showed significant remodeling distant from the covarying position, including restructuring of an inter-hairpin loop, DNA distortions near the scissile phosphates, and new base-specific contacts. Our findings are consistent with a model whereby the functional impacts of covariation can be indirectly propagated to neighboring residues outside of direct contact range, allowing meganucleases to adapt to target site variation and indirectly expand the sequence space accessible for cleavage. We suggest that some engineered meganucleases may have unexpected cleavage profiles that were not rationally incorporated during the design process.

scholarly journals High-pressure synthesis and physical properties of A-site ordered perovskites

2014 ◽  
Vol 70 (a1) ◽  
pp. C755-C755
Author(s):  
Youwen Long
Keyword(s):  
High Pressure ◽  
Transition Metal ◽  
Physical Properties ◽  
Colossal Magnetoresistance ◽  
Research Work ◽  
Negative Thermal Expansion ◽  
Transition Metal Ions ◽  
High Pressure Synthesis ◽  
Pressure Synthesis ◽  
A Site

ABO3-type perovskite oxides exhibit a wide variety of interesting physical properties such as superconductivity, colossal magnetoresistance, multiferroic behavior etc. For a simple ABO3 perovskite, if three quarters of the A site is replaced by a transition metal A', then the so-called A-site ordered double perovskite with the chemical formula of AA'3B4O12 can form. Since both A' and B sites accommodate transition metal ions, in addition to conventional B-B interaction, the new A'-A' and/or A'-B interaction is possible to show up, giving rise to the presence of many novel physical properties. Here we will show our recent research work on the high-pressure synthesis of several A-site ordered perovskites as well as a series of interesting physical properties like temperature- and pressure-induced intermetallic charge transfer, negative thermal expansion, magnetoelectric coupling multiferroic and so on. [1-3]

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