The Role of Gallium Antisite Defect in Activation and Type-Conversion in Si Implanted GaAs

1985 ◽  
Vol 24 (Part 2, No. 12) ◽  
pp. L921-L924 ◽  
Author(s):  
Toshiro Hiramoto ◽  
Yasunori Mochizuki ◽  
Toshio Saito ◽  
Toshiaki Ikoma
Keyword(s):  
Antisite Defect ◽  
Type Conversion

scholarly journals Role of Chemistry and Crystal Structure on the Electronic Defect States in Cs-Based Halide Perovskites

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1032
Author(s):  
Anirban Naskar ◽  
Rabi Khanal ◽  
Samrat Choudhury
Keyword(s):  
Crystal Structure ◽  
Density Functional ◽  
Covalent Bond ◽  
Density Functional Theory Calculations ◽  
Antisite Defect ◽  
Defect States ◽  
Functional Theory ◽  
Electronic Defect ◽  
Constituent Elements

The electronic structure of a series perovskites ABX3 (A = Cs; B = Ca, Sr, and Ba; X = F, Cl, Br, and I) in the presence and absence of antisite defect XB were systematically investigated based on density-functional-theory calculations. Both cubic and orthorhombic perovskites were considered. It was observed that for certain perovskite compositions and crystal structure, presence of antisite point defect leads to the formation of electronic defect state(s) within the band gap. We showed that both the type of electronic defect states and their individual energy level location within the bandgap can be predicted based on easily available intrinsic properties of the constituent elements, such as the bond-dissociation energy of the B–X and X–X bond, the X–X covalent bond length, and the atomic size of halide (X) as well as structural characteristic such as B–X–B bond angle. Overall, this work provides a science-based generic principle to design the electronic states within the band structure in Cs-based perovskites in presence of point defects such as antisite defect.

Molecular Statics of a Ni/Zr Heterophase Interface

1993 ◽  
Vol 319 ◽  
Author(s):  
M. G. Fernandes ◽  
V. Pontikis ◽  
P.D. Bristowe
Keyword(s):  
Energy Minimization ◽  
Strain Field ◽  
Antisite Defect ◽  
Dislocation Network ◽  
Misfit Dislocations ◽  
Atomistic Model ◽  
Hexagonal Array ◽  
Strong Function ◽  
Defect Energies

AbstractAn atomistic model for a Ni/Zr hetero-interface formed between closed packed atomic planes is constructed and simulated using energy minimization techniques. The results show how misfit dislocations are introduced in the system and form an hexagonal array, and that the strain field in Ni can reach values two times larger than those in Zr. Calculated values for antisite defect energies are positive and are a strong function of position at the interface, reflecting the role of the dislocation network.

scholarly journals Role of Arsenic Antisite Defect in Nonstoichiometric Gallium Arsenide

1995 ◽  
Vol 88 (4) ◽  
pp. 747-750 ◽  
Author(s):  
J. Jasiński ◽  
A. Kurpiewski ◽  
K. Korοna ◽  
M. Kamińska ◽  
M. Ρalczewska ◽  
...  
Keyword(s):  
Gallium Arsenide ◽  
Antisite Defect

The role of Ag in aqueous solution processed (Ag,Cu)2ZnSn(S,Se)4kesterite solar cells: antisite defect elimination and importance of Na passivation

2018 ◽  
Vol 6 (31) ◽  
pp. 15170-15181 ◽  
Author(s):  
Wei-Chih Huang ◽  
Shih-Yuan Wei ◽  
Chung-Hao Cai ◽  
Wei-Hao Ho ◽  
Chih-Huang Lai
Keyword(s):  
Aqueous Solution ◽  
Solar Cells ◽  
Low Temperature ◽  
Spray Pyrolysis ◽  
Antisite Defect ◽  
Solution Processed ◽  
Antisite Defects ◽  
Defect Elimination

Kesterite with a high Ag content processed at low temperature without CuZnantisite defects using aqueous spray pyrolysis reaches 10% efficiency.

scholarly journals Circular RNA screening identifies circMYLK4 as a regulator of fast/slow myofibers in porcine skeletal muscles

2021 ◽  
Author(s):  
Haigang Cao ◽  
Jieming Liu ◽  
Tianning Du ◽  
Yihao Liu ◽  
Xiaoyu Zhang ◽  
...  
Keyword(s):  
Muscle Development ◽  
Circular Rna ◽  
Marker Genes ◽  
Skeletal Muscle Development ◽  
Type Conversion ◽  
Protein Levels ◽  
Skeletal Myofiber ◽  
Myofiber Type

AbstractThe type of myofiber is related to the quality of meat. The slow oxidized myofiber helps to increase the tenderness and juiciness of muscle. Numerous studies have shown that circRNA plays a key role in skeletal muscle development. However, the role of circRNA in porcine skeletal myofiber types is unclear. In this study, we performed high-throughput RNA sequencing to study the differential expression of circRNA in the longissimus dorsi and the soleus muscle. A total of 40,757 circRNAs were identified, of which 181 were significantly different. Interestingly, some circRNAs were involved in metabolism pathways, AMPK, FoxO, and PI3K-Akt signaling pathways. Besides, we focused on a novel circRNA-circMYLK4. By injecting circMYLK4-AAV into piglets, we found that circMYLK4 significantly increased the mRNA and protein levels of the slow muscle marker genes. In summary, our study laid an essential foundation for further research of circRNA in myofiber type conversion and higher meat quality.

The role of antisite defect pairs in surface reconstruction of layered AMO2 oxides: A DFT+U study

2021 ◽  
Vol 537 ◽  
pp. 147750
Author(s):  
A.O. Boev ◽  
S.S. Fedotov ◽  
A.M. Abakumov ◽  
K.J. Stevenson ◽  
G. Henkelman ◽  
...  
Keyword(s):  
Surface Reconstruction ◽  
Antisite Defect

scholarly journals Purification of the Formate-Tetrahydrofolate Ligasefrom Methylobacterium extorquens AM1 and Demonstrationof Its Requirement for MethylotrophicGrowth

2003 ◽  
Vol 185 (24) ◽  
pp. 7169-7175 ◽  
Author(s):  
Christopher J. Marx ◽  
Markus Laukel ◽  
Julia A. Vorholt ◽  
Mary E. Lidstrom
Keyword(s):  
Mutant Strain ◽  
Gene Products ◽  
Wild Type ◽  
Methylobacterium Extorquens ◽  
Type Conversion ◽  
Purification And Characterization ◽  
Formaldehyde Oxidation ◽  
Genes Encoding

ABSTRACT The serine cycle methylotroph Methylobacterium extorquens AM1 contains two pterin-dependent pathways for C1 transfers, the tetrahydrofolate (H4F) pathway and the tetrahydromethanopterin (H4MPT) pathway, and both are required for growth on C1 compounds. With the exception of formate-tetrahydrofolate ligase (FtfL, alternatively termed formyl-H4F synthetase), all of the genes encoding the enzymes comprising these two pathways have been identified, and the corresponding gene products have been purified and characterized. We present here the purification and characterization of FtfL from M. extorquens AM1 and the confirmation that this enzyme is encoded by an ftfL homolog identified previously through transposon mutagenesis. Phenotypic analyses of the ftfL mutant strain demonstrated that FtfL activity is required for growth on C1 compounds. Unlike mutants defective for the H4MPT pathway, the ftfL mutant strain does not exhibit phenotypes indicative of defective formaldehyde oxidation. Furthermore, the ftfL mutant strain remained competent for wild-type conversion of [14C]methanol to [14C]CO2. Collectively, these data confirm our previous presumptions that the H4F pathway is not the key formaldehyde oxidation pathway in M. extorquens AM1. Rather, our data suggest an alternative model for the role of the H4F pathway in this organism in which it functions to convert formate to methylene H4F for assimilatory metabolism.

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