NOTE ON SOLID-LIQUID EQUILIBRIA IN SOME TWO-COMPONENT SYSTEMS INVOLVING HYDROGEN CYANIDE

1933 ◽  
Vol 8 (2) ◽  
pp. 114-118 ◽  
Author(s):  
A. L. Peiker ◽  
C. C. Coffin
Keyword(s):  
Hydrogen Cyanide ◽  
Freezing Point ◽  
Eutectic Type ◽  
Molecular Compound ◽  
Compound Formation ◽  
Component Systems ◽  
Two Component ◽  
Hydride Hydrogen ◽  
Two Component Systems ◽  
Solid Liquid

The freezing-point curves of the two-component systems hydrogen cyanide-water, hydrogen cyanide-formic acid, hydrogen cyanide-formamide and hydrogen cyanide-benzaldehyde have been determined. These systems are all of the simple eutectic type and show no evidence of molecular compound formation. A chemical reaction prohibited the investigation of solid-liquid equilibria in the case of halogen hydride-hydrogen cyanide systems.

THE CRITICAL TEMPERATURES AND PRESSURES OF THE THREE TWO-COMPONENT SYSTEMS COMPRISED OF CARBON DIOXIDE, METHYL ETHER AND PROPYLENE

1932 ◽  
Vol 6 (5) ◽  
pp. 458-470 ◽  
Author(s):  
C. A. Winkler ◽  
O. Maass
Keyword(s):  
Carbon Dioxide ◽  
Methyl Ether ◽  
Critical Temperatures ◽  
Compound Formation ◽  
Component Systems ◽  
Two Component ◽  
Two Component Systems ◽  
First Time ◽  
Three Components

The so-called critical temperatures and critical pressures for two-component systems are defined. For the first time three two-component systems have been investigated, involving three components taken two at a time. The three components were propylene, methyl ether and carbon dioxide. An experimental technique involving several new features is described. Accuracy in the determination of both critical temperatures and pressures is claimed. The system sulphur dioxide-methyl ether was also examined and the conclusions of previous investigators regarding compound formation confirmed. The results of the other three systems are analyzed and a theoretical discussion of these results reserved for a later publication.

SOME FREEZING POINT AND CONDUCTANCE MEASUREMENTS IN THE SYSTEM NITRIC ACID – ACETIC ACID

1951 ◽  
Vol 29 (6) ◽  
pp. 461-468 ◽  
Author(s):  
Edward G. Taylor ◽  
Alan G. Follows
Keyword(s):  
Acetic Acid ◽  
Nitric Acid ◽  
Freezing Point ◽  
Preliminary Investigation ◽  
Liquid System ◽  
Molecular Compound ◽  
Compound Formation ◽  
Vapor Equilibrium ◽  
Binary Azeotrope ◽  
Solid Liquid

An independent investigation of the phase diagram for the solid–liquid system nitric, acid – acetic acid has confirmed the findings of Miskidzh'yan and Trifonov (4), namely, that a 1: 1 molecular compound exists. Conductance measurements at 0°, 25°, and 40°C. have been made for the same system. It does not appear possible to predict compound formation from the conductance measurements alone. A preliminary investigation of the liquid–vapor equilibrium for the system nitric acid – acetic acid indicates the existence of a maximum boiling azeotrope. Diacetylorthonitric acid—(CH3COO)2N(OH)3—discovered by Pictet and Genequaud (8) is, in all probability, identical with this binary azeotrope. Some molecular weight measurements tend to confirm this view.

The solid-liquid phase equilibria of two component systems

1944 ◽  
Vol 21 (9) ◽  
pp. 454 ◽  
Author(s):  
Walter W. Lucasse ◽  
Robert P. Koob ◽  
John G. Miller
Keyword(s):  
Liquid Phase ◽  
Phase Equilibria ◽  
Component Systems ◽  
Two Component ◽  
Two Component Systems ◽  
Solid Liquid

TWO-COMPONENT SYSTEMS INVOLVING COMPOUND FORMATION

1931 ◽  
Vol 5 (4) ◽  
pp. 436-441 ◽  
Author(s):  
J. Russell ◽  
O. Maass
Keyword(s):  
Hydrogen Chloride ◽  
Methyl Alcohol ◽  
Ethyl Ether ◽  
Compound Formation ◽  
Gaseous State ◽  
Temperature Range ◽  
Component Systems ◽  
Two Component ◽  
Two Component Systems ◽  
Relationship Of

The two-component systems ethyl ether-hydrogen chloride and methyl alcohol-hydrogen chloride have been examined in the gaseous state, and from the pressure-volume-temperature relationship of the binary mixture evidence is adduced of the existence of compound formation. The heats of reaction appear to be constant in the temperature range investigated, and are 5400 calories for the ether hydrochloride, and 9200 calories for the alcohol hydrochloride. The pressure-volume-temperature data for ethyl ether, methyl alcohol and ethyl alcohol are given over the temperature range 50–200 °C., and over the pressure range below one atmosphere.

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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