Nuclear Radiation Detection Scintillators based on ZnSe(Te) crystals.

2011 ◽  
Vol 1341 ◽  
Author(s):  
Volodymyr D. Ryzhikov
Keyword(s):  
Solid Phase ◽  
Radiation Detection ◽  
Decisive Role ◽  
Nuclear Radiation ◽  
Energy Devices ◽  
Preparation Conditions ◽  
Radiation Spectra ◽  
Scintillation Crystals ◽  
Kinetics Of

ABSTRACTWe describe development of semiconductor scintillators (SCS) on the basis of AIIBVI compounds has bridged the gap in a series of “scintillator-photodiode” detectors used in modern multi-channel low-energy devices for visualization of hidden images (tomographs, introscopes). In accordance with the requirements of eventual applications, such SCS materials as ZnSe(Te) show the best matching of intrinsic radiation spectra to photosensitivity spectra of silicon photodiodes (PD) among the materials of similar kind. They are characterized by high radiation and thermal stability of their output parameters, as well as by high conversion efficiency. In this work, a thermodynamic model is described for interaction of isovalent dopants (IVD) with intrinsic point defects of AIIBVI semiconductor structures at different ratios of their charges, a decisive role of IVD is shown in formation of the luminescence centers, kinetics of solid-phase reactions and the role of a gas medium are considered under real preparation conditions of ZnSe(Te) scintillation crystals, and luminescence mechanisms in IVD-doped SCS are discussed.

Role of Stoichiometry in the Growth of Large Pb2P2Se6 Crystals for Nuclear Radiation Detection

ACS Photonics ◽  
2017 ◽  
Vol 5 (2) ◽  
pp. 566-573 ◽  
Author(s):  
Yadong Xu ◽  
Xu Fu ◽  
Hongjian Zheng ◽  
Yihui He ◽  
Wenwen Lin ◽  
...  
Keyword(s):  
Radiation Detection ◽  
Nuclear Radiation

scholarly journals The chloroplast 2-cysteine peroxiredoxin functions as thioredoxin oxidase in redox regulation of chloroplast metabolism

2018 ◽  
Author(s):  
Mohamad-Javad Vaseghi ◽  
Kamel Chibani ◽  
Wilena Telman ◽  
Michael Liebthal ◽  
Melanie Gerken ◽  
...  
Keyword(s):  
Redox Regulation ◽  
Plant Cells ◽  
Decisive Role ◽  
Oxidative Inactivation ◽  
Fluctuating Light ◽  
Fructose 1,6 Bisphosphatase ◽  
Chloroplast Metabolism ◽  
Electron Sink ◽  
Kinetics Of

AbstractThiol-dependent redox regulation controls central processes in plant cells including photosynthesis. Thioredoxins reductively activate e.g. Calvin-Benson cycle enzymes. However the mechanism of oxidative inactivation is unknown despite its importance for efficient regulation. Here, the abundant 2-cysteine peroxiredoxin (2-CysPrx), but not its site-directed variants, mediates rapid inactivation of reductively activated fructose-1,6-bisphosphatase and NADPH-dependent malate dehydrogenase (MDH) in the presence of the proper thioredoxins. Deactivation of phosphoribulokinase and MDH was compromised in 2cysprxAB mutants plants upon light/dark transition compared to wildtype. The decisive role of 2cysprxAB in regulating photosynthesis was evident from reoxidation kinetics of ferredoxin upon darkening of intact leaves since its half time decreased 3.5-times in 2cysprxAB. The disadvantage of inefficient deactivation turned into an advantage in fluctuating light. The results show that the 2-CysPrx serves as electron sink in the thiol network important to oxidize reductively activated proteins and represents the missing link in the reversal of thioredoxin-dependent regulation.

scholarly journals N-terminal stretch Arg2, Arg3, Arg4 and Arg5 of human lactoferrin is essential for binding to heparin, bacterial lipopolysaccharide, human lysozyme and DNA

1997 ◽  
Vol 328 (1) ◽  
pp. 145-151 ◽  
Author(s):  
Patrick H. C. VAN BERKEL ◽  
E. J. Marlieke GEERTS ◽  
A. Harry VAN VEEN ◽  
Mathias MERICSKAY ◽  
A. Herman DE BOER ◽  
...  
Keyword(s):  
Lipid A ◽  
Solid Phase ◽  
Decisive Role ◽  
Bacterial Lipopolysaccharide ◽  
Human Lactoferrin ◽  
Binding Assays ◽  
Human Lysozyme ◽  
Ligand Interaction ◽  
Arginine Residues

Human lactoferrin (hLF), a protein involved in host defence against infection and excessive inflammation, interacts with heparin, the lipid A moiety of bacterial lipopolysaccharide, human lysozyme (hLZ) and DNA. To determine which region of the molecule is important in these interactions, solid-phase ligand binding assays were performed with hLF from human milk (natural hLF) and N-terminally deleted hLF variants. Iron-saturated and natural hLF bound equally well to heparin, lipid A, hLZ and DNA. Natural hLF lacking the first two N-terminal amino acids (Gly1-Arg2) showed reactivities of one-half, two-thirds, one-third and one-third towards heparin, lipid A, hLZ and DNA respectively compared with N-terminally intact hLF. A lack of the first three residues (Gly1-Arg2-Arg3) decreased binding to the same ligands to one-eighth, one-quarter, one-twentieth and one-seventeenth respectively. No binding occurred with a mutant lacking the first five residues (Gly1-Arg2-Arg3-Arg4-Arg5). An anti-hLF monoclonal antibody (E11) that reacts to an N-lobe epitope including Arg5 completely blocked hLF-ligand interaction. These results show that the N-terminal stretch of four consecutive arginine residues, Arg2-Arg3-Arg4-Arg5, has a decisive role in the interaction of hLF with heparin, lipid A, hLZ and DNA. The role of limited N-terminal proteolysis of hLF in its anti-infective and anti-inflammatory properties is discussed.

scholarly journals The chloroplast 2-cysteine peroxiredoxin functions as thioredoxin oxidase in redox regulation of chloroplast metabolism

eLife ◽  
2018 ◽  
Vol 7 ◽  
Author(s):  
Mohamad-Javad Vaseghi ◽  
Kamel Chibani ◽  
Wilena Telman ◽  
Michael Florian Liebthal ◽  
Melanie Gerken ◽  
...  
Keyword(s):  
Redox Regulation ◽  
Plant Cells ◽  
Decisive Role ◽  
Oxidative Inactivation ◽  
Fluctuating Light ◽  
Fructose 1,6 Bisphosphatase ◽  
Chloroplast Metabolism ◽  
Electron Sink ◽  
Kinetics Of

Thiol-dependent redox regulation controls central processes in plant cells including photosynthesis. Thioredoxins reductively activate, for example, Calvin-Benson cycle enzymes. However, the mechanism of oxidative inactivation is unknown despite its importance for efficient regulation. Here, the abundant 2-cysteine peroxiredoxin (2-CysPrx), but not its site-directed variants, mediates rapid inactivation of reductively activated fructose-1,6-bisphosphatase and NADPH-dependent malate dehydrogenase (MDH) in the presence of the proper thioredoxins. Deactivation of phosphoribulokinase (PRK) and MDH was compromised in 2cysprxAB mutant plants upon light/dark transition compared to wildtype. The decisive role of 2-CysPrx in regulating photosynthesis was evident from reoxidation kinetics of ferredoxin upon darkening of intact leaves since its half time decreased 3.5-times in 2cysprxAB. The disadvantage of inefficient deactivation turned into an advantage in fluctuating light. Physiological parameters like MDH and PRK inactivation, photosynthetic kinetics and response to fluctuating light fully recovered in 2cysprxAB mutants complemented with 2-CysPrxA underlining the significance of 2-CysPrx. The results show that the 2-CysPrx serves as electron sink in the thiol network important to oxidize reductively activated proteins and represents the missing link in the reversal of thioredoxin-dependent regulation.

The main directions of educational policy of Finland

2020 ◽  
Vol 11 (2) ◽  
pp. 6-13
Author(s):  
K. E. Stupak ◽  
Keyword(s):  
Higher Education ◽  
Education Policy ◽  
Education System ◽  
Decisive Role ◽  
The State ◽  
Vocational Education And Training ◽  
State Education Policy ◽  
Role Of The State ◽  
State Education

The article deals with analyzing the main streams of the education policy in Finland, which reflect the relationship between a person and society in modern socio–economic conditions. Such policy directs the system of education to change the person and his mind himself. Finland using its education system, has long before been concerned about preparing people for the future by reforming approaches to teaching in schools and higher education institutions. As a result, it has achieved world–wide recognition and top positions in various ratings have resulted. Therefore, today there is a great interest of scientists in certain issues of education functioning in Finland. Thus, G. Androshchuk, V. Butova. I. Zhernokleeva, T. Pushkareva and others study in their works the purpose and decisive role of Finland's education policy in the development of the education system. S. Grinyuk and V. Zagvozdkin pay attention to the practical the steps of reforming the Finnish system of education. T. Drobyshevsk investigates the system of providing educational services in Finland as a sector of knowledge production. L. Volynets, P. Kukharchuk consider the principles of the state education policy of Finland. L. Smolskaya examines the role of the state policy in implementing the "Finnish phenomenon"; P. Basyliuk and Yu. Kulykova, focus attention on the study of the evolution of the system of higher education in Finland; O. Scherbak reveals peculiarities of vocational education and training.

Democratization in Serbia: An Analysis of Rational Choice and Structuralist Explanations

2015 ◽  
Author(s):  
Dunja Apostolov-Dimitrijevic
Keyword(s):  
Rational Choice ◽  
Path Dependence ◽  
Theoretical Perspective ◽  
Political Leadership ◽  
Decisive Role ◽  
The Other ◽  
Internal Factors ◽  
Transitional Societies ◽  
The Face

This paper explains political democratization in Post-Milosevic Serbia, utilizing two different accounts of the democratization process: one rooted in the rational choice framework and the other in structuralism. While rational choice explains the decisive role of political leadership in overcoming path dependence, the structuralist explanations show the transnational linkages that encourage democratization in the face of domestic setbacks. This particular debate between the two types of explanations represents the larger debate concerning the role of internal factors and external linkages in propelling democratization in transitional societies. The paper concludes by integrating the two sets of explanations offered by each theoretical perspective, in order to develop a coherent understanding of Serbia's democratization.   Full text available at: https://doi.org/10.22215/rera.v9i1.240

Sign in / Sign up

Export Citation Format

Share Document