scholarly journals Formation of complexes consisting of impurity Mn atoms and group VI elements in the crystal lattice of silicon

2021 ◽  
Vol 24 (3) ◽  
pp. 255-260
Author(s):  
K.А. Ismailov ◽  
◽  
X.M. Iliev ◽  
M.O. Tursunov ◽  
B.K. Ismaylov ◽  
...  
Keyword(s):  
Complex Formation ◽  
Crystal Lattice ◽  
Silicon Crystal ◽  
Covalent Bond ◽  
Group Vi ◽  
Impurity Atoms ◽  
Unit Cells ◽  
Formation Of Complexes

Formation of complexes of impurity Mn atoms with impurity atoms of group VI elements (S, Se, Te) in the silicon crystal lattice has been studied. It has been experimentally found that formation of electrically neutral molecules with an ionic-covalent bond between Mn atoms and group VI elements takes place, which possibly leads to formation of new Si2BVI++Mn binary unit cells in the silicon crystal lattice. It has been shown that in the samples Si<S, Mn>, Si<Se, Mn> and Si<Te, Mn>, an intense complex formation occurs at the temperatures 1100, 820 and 650°C, respectively.

Western Blot Analyses of Prekallikrein and its Activation Products in Human Plasma

1991 ◽  
Vol 65 (04) ◽  
pp. 382-388 ◽  
Author(s):  
Dulce Veloso ◽  
Robert W Colman
Keyword(s):  
Complex Formation ◽  
Western Blot ◽  
Human Plasma ◽  
Contact System ◽  
Plasma Activation ◽  
Normal Plasma ◽  
Sds Page ◽  
Activation Products ◽  
Major Antigen ◽  
Formation Of Complexes

SummaryPrekallikrein (PK), a zymogen of the contact system, and its activation products, kallikrein (KAL), KAl-inhibitor complexes and fragments containing KAL epitope(s) have been detected in human plasma by immunoblotting with a monoclonal anti-human plasma PK antibody, MAb 13G1L. Detection of antigen-MAb 13G11 complexes with peroxidase-conjugated anti-IgG showed that the two variants of PK (85- and 88-kDa) are the only major antigen species in normal, non-activated plasma. Upon plasma activation with kaolin, the intensity of the PK bands decreased with formation of complexes of KAL with CL inhibitor (C1 INH) and α2-rrtzcroglobulin (α2M) identical to those formed by the purified proteins. Immunoblots of normal plasma showed good correlation between the PK detected and the amount of plasma assayed. Increasing amounts of KAL incubated with a constant volume of PK-deficient plasma showed increasing amounts of KAL and of KAL-C1 INH and KAL-α2M complexes. Complexes of KALantithrombin III (ATIII) and the ratio of KALα2M/ KAL-CL INH were higher in activated CL INH-deficient plasmas than in activated normal plasmas. Protein resolution by 3-12% gradient SDS-PAGE and epitope detection with [125I]MAb 13G11 showed four KALα2M species and a 45-kDa fragment(s) in both surface-activated normal plasma and complexes formed by purified KAL and α2M. Immunoblots of activated plasma also showed bands at the position of KALCL INH and KALATIII complexes. When α1-antitrypsin Pittsburgh (cα1-AT, Pitts) was added to plasma before activation, KAL-α1-ALPitts was the main complex. The non-activated normal plasma revealed only an overloaded PK band. This is the first report of an antibody that recognizes KAL epitope(s) in KAL-α2M, KALATIII and KALa1-α1Pitts complexes and in the 45-kDa fragment(s). Therefore, MAb 13G11 should be useful for studying the structure of these complexes as well as the mechanism of complex formation. In addition, immunoblotting with MAb 13G11 would allow detection of KAl-inhibitor complexes in patient plasmas as indicators of activation of the contact system.

Mechanisms of interactions between atomic hydrogen and vacancies in the silicon crystal lattice

1996 ◽  
Vol 37 (1) ◽  
pp. 18-23
Author(s):  
V. M. Pinchuk ◽  
A. N. Nazarov ◽  
V. S. Lysenko ◽  
V. M. Kovalev
Keyword(s):  
Crystal Lattice ◽  
Atomic Hydrogen ◽  
Silicon Crystal

Doping and Charging in Colloidal Semiconductor Nanocrystals

MRS Bulletin ◽  
2001 ◽  
Vol 26 (12) ◽  
pp. 1005-1008 ◽  
Author(s):  
Moonsub Shim ◽  
Congjun Wang ◽  
David J. Norris ◽  
Philippe Guyot-Sionnest
Keyword(s):  
Electrical Properties ◽  
Crystal Lattice ◽  
Electric Fields ◽  
Semiconductor Devices ◽  
Semiconductor Nanocrystals ◽  
Semiconductor Technology ◽  
Semiconductor Crystal ◽  
Impurity Atoms ◽  
Colloidal Semiconductor Nanocrystals ◽  
Colloidal Semiconductor

Modern semiconductor technology has been enabled by the ability to control the number of carriers (electrons and holes) that are available in the semiconductor crystal. This control has been achieved primarily with two methods: doping, which entails the introduction of impurity atoms that contribute additional carriers into the crystal lattice; and charging, which involves the use of applied electric fields to manipulate carrier densities near an interface or junction. By controlling the carriers with these methods, the electrical properties of the semiconductor can be precisely tailored for a particular application. Accordingly, doping and charging play a major role in most modern semiconductor devices.

scholarly journals Stability, diffusion, and complex formation of beryllium in wurtzite GaN

2000 ◽  
Vol 639 ◽  
Author(s):  
Sukit Limpijumnong ◽  
Chris G. Van de Walle ◽  
Jörg Neugebauer
Keyword(s):  
Complex Formation ◽  
First Principles ◽  
Formation Energy ◽  
Potential Problem ◽  
Vibrational Modes ◽  
First Principles Calculations ◽  
Experimental Identification ◽  
Donor Character ◽  
Formation Of Complexes

ABSTRACTWe have studied the properties of Be dopants in GaN using first principles calculations. Substitutional Be on a Ga site acts as an acceptor, but interstitial Be poses a potential problem because of its low formation energy and donor character. We study the diffusion of interstitial Be and find it to be highly anisotropic. We also study the formation of complexes between substitutional and interstitial Be, and between substitutional Be and hydrogen. We have calculated the Be-H vibrational modes to aid in experimental identification of such complexes.

scholarly journals Comparative termodynamic analysis of thrombin interaction with anti-thrombin aptamers and their heterodimeric construct

2010 ◽  
Vol 56 (3) ◽  
pp. 404-411 ◽  
Author(s):  
S.Yu. Rakhmetova ◽  
S.P. Radko ◽  
O.V. Gnedenko ◽  
N.V. Bodoev ◽  
A.S. Ivanov ◽  
...  
Keyword(s):  
Complex Formation ◽  
Temperature Interval ◽  
Entropy Change ◽  
Optical Biosensor ◽  
Dissociation Rate ◽  
Enthalpy Change ◽  
Anion Binding ◽  
Kd Values ◽  
Formation Of Complexes

Aptamers interacting selectively with the anion-binding exosites 1 and 2 of thrombin were merged into dimeric oligonucleotide constructs with use of a poly-(dT)-linker of 35 nucleotides (nt) long. Complexes of thrombin with the aptamers and their hetero- and homodimeric constructs were measured using the optical biosensor Biacore-3000. KD values measured for the hetero- and homodimeric constructs were correspondingly 25-30- and 2-3-fold lower than those for the primary aptamers. Analysis of temperature dependencies of KD values within the temperature interval of 10°C-40°C has shown that the values of enthalpy change ΔH upon formation of complexes of thrombin with the aptamers and the hetrodimeric construct are close. The value of the entropy change ΔS upon complex formation of thrombin with the aptamer heterodimeric construct was 1.5-2-fold higher than ΔS values for the complexes with the aptamers. The complex formation and dissociation rates increased with the elevation of temperature from 10°С to 37°С. However, the dissociation rate for the complex of thrombin with the heterodimeric construct was evidently lower that that for the complexes with the aptamers.

The Accumulation of Chromium Complexes in Skeletal Tissue

1970 ◽  
Vol 09 (04) ◽  
pp. 354-365
Author(s):  
Leopoldo Anghileri
Keyword(s):  
Calcium Carbonate ◽  
Complex Formation ◽  
Crystal Lattice ◽  
Cation Exchange ◽  
Intravenous Injection ◽  
The Body ◽  
High Uptake ◽  
Skeletal Tissue

SummaryStudies of the in vivo distribution of 51Cr-alloxantin complex show a high uptake by bone. 24 hours after intravenous injection, approximately 20% of the complex remains in the body, and 50—65% of this chromium is in skeleton. In vitro studies of its interaction with calcium carbonate and phosphate indicate a minimum of cation exchange, and therefore it is postulated that most of the interaction is due to a complex formation with the crystal lattice.

Synthesis and X-Ray Analysis of Complex Ferrites

2017 ◽  
Vol 744 ◽  
pp. 393-398 ◽  
Author(s):  
Mukhametkali Musagalievich Mataev ◽  
M.R. Abdraimova ◽  
S.M. Saxena ◽  
D.Zh. Nuketaeva ◽  
B.T. Zheksembieva
Keyword(s):  
Magnetic Field ◽  
Comparative Analysis ◽  
Crystal Lattice ◽  
Complex Oxides ◽  
Mixed Complex ◽  
X Ray ◽  
Unit Cells ◽  
First Time ◽  
The Relationship ◽  
Crystal Lattice Parameters

Ferrite with mixed complex oxides BiNaFe2O5, BiKFe2O5 was synthesized by high temperature solid state reaction. The structure of the ferrites, type of syngony, parameters of the unit cells, radiographic and pycnometric densities were determined by X-ray phase analysis for a first time: BiNaFe2O5 – а=5,577, с=13,86 Å, γ=120º, Vun.cell. = 373,9 Å3, Z=4, ρrad.= 7,5262 г/см3, ρpicn.=7,5271 г/см3, BiKFe2O5 –а=5,545, с=13,65 Å, γ=120º, Vun.cell.= 363,45Å3, Z=6, ρrad.= 8,0367, ρpicn.=8,0375 г/см3. A comparative analysis of the relationship between crystal lattice parameters with parameters of the crystal lattice of initial oxides and complex ferrites has been performed. Research dependence of the magnetic moment of the complex ferrite BiNaFe2O5 of the applied magnetic field at a constant temperature T = 6.1405 K showed a paramagnetic shift in the structure.

Thermal Donor Formation Affected by Strain Fields Induced by Imperfections of Silicon Crystal Lattice

1993 ◽  
Vol 103-105 ◽  
pp. 543-550
Author(s):  
I.I. Kolkovskii ◽  
P.F. Lugakov ◽  
V.V. Lukyanitsa ◽  
A.V. Tsikunov
Keyword(s):  
Crystal Lattice ◽  
Silicon Crystal ◽  
Strain Fields ◽  
Thermal Donor ◽  
Donor Formation
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