Two-component systems of isomorphous orientationally disordered crystals. Part 1 Packing of the mixed crystals

1999 ◽  
Vol 9 (4) ◽  
pp. 909-916 ◽  
Author(s):  
Josep Salud ◽  
David O. López ◽  
Maria Barrio ◽  
Josep Ll. Tamarit
Keyword(s):  
Mixed Crystals ◽  
Component Systems ◽  
Two Component ◽  
Two Component Systems ◽  
Disordered Crystals

Two-component systems of isomorphous orientationally disordered crystals. Part 2 Thermodynamic analysis

1999 ◽  
Vol 9 (4) ◽  
pp. 917-921 ◽  
Author(s):  
Josep Salud ◽  
David O. López ◽  
Josep Ll. Tamarit ◽  
Maria Barrio ◽  
Harry A. J. Oonk
Keyword(s):  
Thermodynamic Analysis ◽  
Component Systems ◽  
Two Component ◽  
Two Component Systems ◽  
Disordered Crystals

Luminescence and triplet energy transfer in mixed crystals. I. Two-component systems

1969 ◽  
Vol 22 (10) ◽  
pp. 2061 ◽  
Author(s):  
KR Adam ◽  
MF O'Dwyer
Keyword(s):  
Energy Transfer ◽  
Delayed Fluorescence ◽  
Mixed Crystals ◽  
Temperature Dependent ◽  
Triplet Energy ◽  
Component Systems ◽  
Two Component ◽  
Two Component Systems ◽  
Quantitative Results ◽  
Triplet Energy Transfer

Quantitative results are given for the temperature dependence of the intensities and decays of phosphorescence and delayed fluorescence in a number of two-component organic mixed crystals. These results are interpreted in terms of a kinetic model. For low guest concentrations, the guest phosphorescence decay is found to be first order and strongly temperature dependent with an activation energy different from that involved in energy transfer to the host triplet exciton level.

Diffusive layering during film growth in two-component systems with limited mutual solubility

2000 ◽  
Author(s):  
Grigory V. Merkulov ◽  
Valentin M. Ievlev ◽  
Evgeny V. Shvedov ◽  
Vadim P. Ampilogov
Keyword(s):  
Film Growth ◽  
Mutual Solubility ◽  
Component Systems ◽  
Two Component ◽  
Two Component Systems

scholarly journals Regulation of virulence and β-lactamase gene expression in Staphylococcus aureus isolates: cooperation of two-component systems in bloodstream superbugs

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Sanaz Dehbashi ◽  
Hamed Tahmasebi ◽  
Behrouz Zeyni ◽  
Mohammad Reza Arabestani
Keyword(s):  
Staphylococcus Aureus ◽  
Real Time ◽  
Real Time Pcr ◽  
Quantitative Real Time Pcr ◽  
Gene Expressions ◽  
Resistance Development ◽  
Component Systems ◽  
Two Component ◽  
Two Component Systems ◽  
Lactamase Gene

Abstract Background Methicillin-resistant Staphylococcus aureus (MRSA)-bloodstream infections (BSI) are predominantly seen in the hospital or healthcare-associated host. Nevertheless, the interactions of virulence factor (VFs) regulators and β-lactam resistance in MRSA-BSI are unclear. This study aims to characterize the molecular relationship of two-component systems of VFs and the expression of the β-lactamase gene in MRSA-BSI isolates. In this study, 639 samples were collected from BSI and identified by phenotypic methods. We performed extensive molecular characterization, including SCCmec type, agr type, VFs gene profiles determinations, and MLST on isolates. Also, a quantitative real-time PCR (q-RT PCR) assay was developed for identifying the gene expressions. Results Ninety-one (91) S. aureus and 61 MRSA (67.0%) strains were detected in BSI samples. The presence of VFs and SCCmec genes in MRSA isolates were as follows: tst (31.4%), etA (18.0%), etB (8.19%), lukS-PVL (31.4%), lukF-PV (18.0%), lukE-lukD (16.3%), edin (3.2%), hla (16.3%), hlb (18.0%), hld (14.7%), hlg (22.9%), SCCmecI (16.3%), SCCmecII (22.9%), SCCmecIII (36.0%), SCCmecIV (21.3%), and SCCmecV (16.3%). Quantitative real-time PCR showed overexpression of mecRI and mecI in the toxigenic isolates. Moreover, RNAIII and sarA genes were the highest expressions of MRSA strains. The multi-locus sequence typing data confirmed a high prevalence of CC5, CC8, and CC30. However, ST30, ST22, and ST5 were the most prevalent in the resistant and toxigenic strains. Conclusion We demonstrated that although regulation of β-lactamase gene expressions is a significant contributor to resistance development, two-component systems also influence antibiotic resistance development in MRSA-BSI isolates. This indicates that resistant strains might have pathogenic potential. We also confirmed that some MLST types are more successful colonizers with a potential for MRSA-BSI.

Monte Carlo Simulation of Electronic Excitation Migrationand Trappingin Disordered Two-Component Systems. A Comparison with Analytical Theories

1989 ◽  
Vol 44 (4) ◽  
pp. 257-261 ◽  
Author(s):  
Sławomir Błonski ◽  
Czesław Bojarski
Keyword(s):  
Monte Carlo ◽  
Electronic Excitation ◽  
Two Component System ◽  
Component System ◽  
Steady State Fluorescence ◽  
Donor And Acceptor ◽  
Component Systems ◽  
Two Component ◽  
Two Component Systems ◽  
Viscous Solution

Abstract Monte Carlo simulations of quantum yield and anisotropy of fluorescence in two-component systems have been conducted with various donor and acceptor concentrations and Förster radii ratios RDAO/RDDO. The influence of excitation migration and trapping on the fluorescence of the viscous solution has been considered. The results of the simulations have shown that steady-state fluorescence of a two-component system depends on the RDAO/RDDO ratio as predicted in LAF theory.

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