Boronyl as a terminal ligand in boron oxide clusters: hexagonal ring C2vB6O4and ethylene-like D2hB6O4−/2−

2015 ◽  
Vol 17 (30) ◽  
pp. 19929-19935 ◽  
Author(s):  
Wei Wang ◽  
Qiang Chen ◽  
Ying-Jin Wang ◽  
Hui Bai ◽  
Ting-Ting Gao ◽  
...  
Keyword(s):  
Boron Oxide ◽  
Terminal Ligand ◽  
Hexagonal Ring ◽  
Open Structures

Planar boron boronyl B6O40/−/2−clusters are predicted. B6O4is an inorganic analogue of benzene, whereas B6O4−/2−are ethylene-like with open structures.

DIFFICULTIES WITH OPEN STRUCTURES

1972 ◽  
Vol 33 (C3) ◽  
pp. C3-209-C3-212 ◽  
Author(s):  
J. M. ZIMAN
Keyword(s):  
Open Structures

Exact "Absorbing" Conditions for Modeling of Transients in Open Structures

2001 ◽  
Vol 55 (6-7) ◽  
pp. 11 ◽  
Author(s):  
Yurii Konstantinovich Sirenko ◽  
Andrei Olegovich Perov ◽  
E. Yaldiz
Keyword(s):  
Open Structures

Acid-base properties of metals and glasses of Na2O.P2O5-xB2O3 system

1984 ◽  
Vol 49 (10) ◽  
pp. 2355-2362 ◽  
Author(s):  
Juraj Leško ◽  
Marie Dorušková ◽  
Jan Tržil
Keyword(s):  
Boron Oxide ◽  
A Priori ◽  
Optical Basicity ◽  
Galvanic Cell ◽  
Acid Base ◽  
Tetrahedral Configuration ◽  
Relative Basicity ◽  
Base Theory ◽  
Base Properties

Boron oxide in the Na2O.P2O5-x B2O3 system behaves as a Lux base. Its addition to Na2O.P2O5 brings about transformation of a Co(II) indicator from octahedral to tetrahedral configuration, increase in the optical basicity ΛPb(II), increase in the relative basicity of the melt as determined by means of a galvanic cell, and depolymerization reactions releasing PO43- ions. In the Na2O-B2O3 system free of P2O5, boron oxide behaves as a Lux acid. The amphoretic nature of B2O3 is explained in terms of Lux's acid-base theory extended in analogy with the protolysis theory. The theoretical optical basicity values do not indicate the amphoretic behaviour of B2O3 because in this approach boron oxide is a priori regarded as more acidic than Na2O.P2O5.

Enhanced electrochemical properties of Li[Li0.2Mn0.54Ni0.13Co0.13]O2 via lithium boron oxide glass surface treatment

2016 ◽  
Vol 292 ◽  
pp. 66-69 ◽  
Author(s):  
Maohui Bai ◽  
Zhixing Wang ◽  
Xinhai Li ◽  
Huajun Guo ◽  
Zhenjiang He ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Electrochemical Properties ◽  
Boron Oxide ◽  
Glass Surface ◽  
Oxide Glass

Synthetic Strategies for Hollow Particles with Open Holes on Their Surfaces

2021 ◽  
Author(s):  
Hua Zou ◽  
Ke Shang
Keyword(s):  
Hollow Particles ◽  
Single Hole ◽  
Open Structures

Hollow particles with open holes on their surfaces, which refer to hollow micro/nano spheres with open structures such as single hole or multi-holes on their surface, have attracted increasing interest...

scholarly journals Molecular Evolution at the decapentaplegic Locus in Drosophila

Genetics ◽  
1997 ◽  
Vol 145 (2) ◽  
pp. 297-309 ◽  
Author(s):  
Stuart J Newfeld ◽  
Richard W Padgett ◽  
Seth D Findley ◽  
Brent G Richter ◽  
Michele Sanicola ◽  
...  
Keyword(s):  
Molecular Evolution ◽  
Transforming Growth Factor ◽  
Transforming Growth Factor Β ◽  
Selective Constraint ◽  
Amino Acid Sequences ◽  
Regulatory Sequences ◽  
Protein Coding ◽  
Terminal Ligand ◽  
Cdna Sequences ◽  
Interspecific Comparisons

Using an elaborate set of cis-regulatory sequences, the decapentaplegic (dpp) gene displays a dynamic pattern of gene expression during development. The C-terminal portion of the DPP protein is processed to generate a secreted signaling molecule belonging to the transforming growth factor-β (TGF-β) family. This signal, the DPP ligand, is able to influence the developmental fates of responsive cells in a concentration-dependent fashion. Here we examine the sequence level organization of a significant portion of the dpp locus in Drosophila melanogaster and use interspecific comparisons with D. simulans, D. pseudoobscura and D.virilis to explore the molecular evolution of the gene. Our interspecific analysis identified significant selective constraint on both the nucleotide and amino acid sequences. As expected, interspecific comparison of protein coding sequences shows that the C-terminal ligand region is highly conserved. However, the central portion of the protein is also conserved, while the N-terminal third is quite variable. Comparison of noncoding regions reveals significant stretches of nucleotide identity in the 3′ untranslated portion of exon 3 and in the intron between exons 2 and 3. An examination of cDNA sequences representing five classes of dpp transcripts indicates that these transcripts encode the same polypeptide.

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