Anomale Michaelis-Becker-Reaktion: 1-PhenyIethan-1,2,2-trisphosphonsäure und ihre Ester / Anomalous Michaelis-Becker Reaction: 1-Phenylethan-1,2,2-triphosphonic Acid and their Esters

1985 ◽  
Vol 40 (9) ◽  
pp. 1152-1156 ◽  
Author(s):  
Ulrich Fischer ◽  
Gerhard Hägele
Keyword(s):  
Protolytic Equilibrium ◽  
Param Eters

Sodium dialkylphosphite reacts with trichlorovinylbenzene to yield in an one-batch procedure 1-phenyl-1,2,2-ethanetrisphosphonic acid hexaalkyl esters. A carbanionic intermediate of an “anomalous Michaelis-Becker reaction” is deduced. Acidolysis of esters leads to the parent trisphosphonic acids. NMR param eters of this acid are strongly influenced by protolytic equilibrium.

Protolytic Equilibrium Constants of Nicotinic Acid Solutions in Water–Dimethylsulfoxide Mixtures

2020 ◽  
Vol 94 (10) ◽  
pp. 2030-2033
Author(s):  
N. N. Kuranova ◽  
N. A. Chesnokova ◽  
A. S. Gushchina ◽  
K. V. Grazhdan ◽  
V. A. Sharnin
Keyword(s):  
Nicotinic Acid ◽  
Equilibrium Constants ◽  
Acid Solutions ◽  
Protolytic Equilibrium

Influence of amidoammonium calix[4]resorcinarenes on methyl orange protolytic equilibrium: supramolecular indicator systems

2013 ◽  
Vol 25 (12) ◽  
pp. 831-841 ◽  
Author(s):  
Ella Kazakova ◽  
Julia Morozova ◽  
Diana Mironova ◽  
Victor Syakaev ◽  
Liya Muslinkina ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Protolytic Equilibrium ◽  
Indicator Systems

scholarly journals Detection of tiny amounts of fissile materials in large-sized containers with radioactive waste

2018 ◽  
Vol 170 ◽  
pp. 05005
Author(s):  
V.F. Batyaev ◽  
S.V. Skliarov
Keyword(s):  
Radioactive Waste ◽  
Neutron Flux ◽  
Thermal Neutron Flux ◽  
Pulse Frequency ◽  
Matrix Type ◽  
Neutron Interrogation ◽  
Interrogation Technique ◽  
Non Destructive ◽  
Frequency Pulse ◽  
Param Eters

The paper is devoted to non-destructive control of tiny amounts of fissile materials in large-sized containers filled with radioactive waste (RAW). The aim of this work is to model an active neutron interrogation facility for detection of fissile ma-terials inside NZK type containers with RAW and determine the minimal detectable mass of U-235 as a function of various param-eters: matrix type, nonuniformity of container filling, neutron gen-erator parameters (flux, pulse frequency, pulse duration), meas-urement time. As a result the dependence of minimal detectable mass on fissile materials location inside container is shown. Nonu-niformity of the thermal neutron flux inside a container is the main reason of the space-heterogeneity of minimal detectable mass in-side a large-sized container. Our experiments with tiny amounts of uranium-235 (<1 g) confirm the detection of fissile materials in NZK containers by using active neutron interrogation technique.

Untersuchung einer Resonanz des karzinogenen Benzpyren. Studies on a Resonance of Carcinogenic Benzpyrene

1975 ◽  
Vol 30 (3-4) ◽  
pp. 152-156
Author(s):  
P Böhm ◽  
F Popp
Keyword(s):  
Dipole Moment ◽  
External Field ◽  
External Perturbation ◽  
Correlation Effect ◽  
Resonance Phenomenon ◽  
Carcinogenic Effect ◽  
Resonance States ◽  
Sensitive Dependence ◽  
Param Eters

Abstract The a- and p-states of 3.4-benzpyrene are calculated by use of common param eters and of a param eter set which predicts the quasi-degeneracy of these states. The quasi-degeneracy will be represented by the breakage of pairing theorem and is to be described as a correlation effect, caused by an asymmetric potential. An external field represents an external perturbation, introduced by interaction with the bioreceptor. The calculation shows a sensitive dependence of probability amplitudes for different configurations which participate in the quasi-degenerated resonance states. Thereby the dipole moment may quickly be changed so that excitons are produced. The resonance phenomenon may lead to the carcinogenic effect

The Electrophoretic Separation of Curved Cisplatin-Modifled DNA Fragments on Polyacrylamide Gels Is Dependent on the Voltage Gradient

1998 ◽  
Vol 53 (9-10) ◽  
pp. 921-923
Author(s):  
Julia Yaneva ◽  
Jordanka Zlatanova
Keyword(s):  
Gel Electrophoresis ◽  
Polyacrylamide Gel Electrophoresis ◽  
Threshold Level ◽  
Voltage Gradient ◽  
Dna Fragments ◽  
Electrophoretic Separation ◽  
Polyacrylamide Gels ◽  
Curved Dna ◽  
Electrophoretic Behavior ◽  
Param Eters

Polyacrylamide gel electrophoresis has been widely used to study DNA fragments containing sequence-dependent curvature. The anomalous electrophoretic behavior of curved DNA fragments on such gels allows their separation from straight fragments of the same length. Here we demonstrate that polyacrylamide gels can be successfully used to resolve DNA fragments modified at a single site by the antitumor drug cis-diamminedichloroplatinum(II) (cis-DDP, cisplatin) from their unmodified counterparts. However, the resolution strongly depends on the voltage gradient, being completely lost when it drops below a certain threshold level. The param eters of the electric field do not affect separation of ‘normal’ DNA fragments of comparable length.

An example program for the determination of chemical rate coefficients from experimental data

SIMULATION ◽  
1967 ◽  
Vol 8 (3) ◽  
pp. 133-137 ◽  
Author(s):  
Richard A. Nesbit ◽  
Robert D. Engel
Keyword(s):  
Experimental Data ◽  
Rate Coefficients ◽  
Rate Equations ◽  
Search Procedure ◽  
Squared Error ◽  
Fast Solution ◽  
Data Points ◽  
Chemical Rate ◽  
Param Eters

A program for matching experimental data to the com puted concentrations of various components of a dynamic chemical process is implemented. The digital subsection of the computer is programmed to execute a steepest descent search procedure. The analog section is programmed to solve the chemical rate equations which simulate the re action dynamics. These equations form a two-point bound ary value problem. The search procedure changes param eters in the rate equations, and it compares the computed concentrations to the experimental ones. The squared error is summed over all data points, and this sum is minimized by the search. Significant speedup of the solution to this type of problem is possible with the hy brid system due to the fast solution of the differential equations on the analog and the automated search pro cedure on the digital.

Flammability Parameters of Materials: Ignition, Combustion, and Fire Propagation

1994 ◽  
Vol 12 (4) ◽  
pp. 329-356 ◽  
Author(s):  
A. Tewarson
Keyword(s):  
Heat Flux ◽  
Heat Release ◽  
Critical Heat Flux ◽  
Thermal Response ◽  
Fire Propagation ◽  
Flammability Parameters ◽  
Param Eters

In this paper, flammability parameters associated with the igni tion, combustion, and fire propagation processes and their usefulness for the development of fire resistant materials are discussed. The flammability param eters discussed are: (a) Critical Heat Flux (CHF) and Thermal Response Param eter (TRP), associated with ignition, (b) Heat Release Parameter (HRP) and Fire Propagation Index (FPI), associated with combustion and fire propagation.

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