Protonation of the oxygen axial ligand in galactose oxidase model compounds as seen with high resolution X-ray emission experiments and FEFF simulations

X-ray Emission Spectroscopy (XES) crossover peaks were shown to be sensitive to the protonation state of solvent molecules in the Zn protein carbonic anhydrase and its model compounds. Here we extend such studies to galactose oxidase models i.e. Cu(ii) open d-shell systems, illustrating that XES combined with FEFF8 simulations reflect changes in the protonation state of the phenolate ligand for the copper center.     

2,2-Dimethylpenta-3,4-dienal derivatives: Preparation,NMR spectra,and crystal structure

Summary The preparation of some new 2,2-dimethylpenta-3,4-dienal derivatives starting byClaisen-Cope rearrangement of the pyrolytic product of the corresponding acetales and followed by condensation reactions is described. The synthesis of homoallenylketone5 from homoallenylaldehyde3 byGrignard reaction and followed by the oxidation of the formed alcohol using potassium chlorochromate (KCC) is reported. All new compounds are characterized by IR, MS,¹H, and¹³C NMR spectroscopy. The full assignment of the NMR signals is based on HETCOR and FLOCK pulse sequences. The molecular and crystal structure of 2,2-dimethylhexa-3,4-dienal 2,4-dinitrophenylhydrazone is presented.Dedicated to ProfessorFritz Sauter on the occasion of his 65th birthday     

Synthese und Viskositiitsverhalten von Poly(γ-p-biphenyl-methyl-L-glutamat) in Benzol/Dichloressigsäure-Mischungen; ein Vergleich mit Poly(ybenzyl-L-glutamat)

Ohne Zusammenfassung     

On relativistic kinetic gas theory: XVII. Diffusion and thermal diffusion in a binary mixture of hard spheres

Results are given for the diffusion and thermal-diffusion coefficients of abinary mixture consisting of particles with constant differential cross-sections (“hard spheres”).     

Generalized Drinfel'd-Sokolov hierarchies

A general approach is adopted to the construction of integrable hierarchies of partial differential equations. A series of hierarchies associated to untwisted Kac-Moody algebras, and conjugacy classes of the Weyl group of the underlying finite Lie algebra, is obtained. The generalized KdV hierarchies of V.G. Drinfel'd and V.V. Sokolov are obtained as the special case for the Coxeter element. Various examples of the general formalism are treated in some detail; including the fractional KdV hierarchies.     

A partial-wave analysis of the reaction π−p → K+K−n measured on a polarized target at ∼18 GeV/c

The reaction π^?p→K⁺K^?n has been studied on a hydrogen target (27 000 events) at 18.4 GeV/c and on a polarized target (54 000 events) at 17.2 GeV/c. A combination of results of both experiments allows a partial-wave analysis of the K⁺K^? system between 1.1 and 1.74 GeV mass without any model assumptions. In general our fits yield unique solutions. Using results of our previous analysis of π⁺π^? final states and assuming the dominance of the positive G-parity states in the K⁺K^? system, the branching ratios $\text{BR}\text{(}\text{K}\text{K}\text{/ππ)}$ of partial waves into $\text{K}\text{K}\text{and}\text{ππ}$ are determined. The S-wave appears to be mainly a broad ε (1300) with $\text{BR}\text{(}\text{K K}\text{/ππ) = 0.068}{}_{\mathrm{?0.021}}{}^{\mathrm{+0.017}}$. The weak P-wave can be described by a tail of the $\text{?(770)}\text{with BR}\text{(}\text{K K}\text{/ππ) = 0.081}{}_{\mathrm{?0.025}}{}^{\mathrm{+0.029}}$. The D-wave is interpreted in terms of a superposition of f(1270) + A₂(1310) + f′(1515) resonances. The fit yields $\text{BR}\text{(}\text{K K}\text{/ππ) = 0.069}{}_{\mathrm{?0.031}}{}^{\mathrm{+0.023}}$ for the f(1270) and BR(ππ/all) = 0.027_?0.013^+0.071 for the f′(1515). The F-wave shows the g(1690) meson with $\text{BR}\text{(}\text{K K}\text{/ππ) = 0.191}{}_{\mathrm{?0.037}}{}^{\mathrm{+0.040}}$. All the above values refer to the t bin between 0.01 and 0.20 (GeV/c)². Some results are also given for the high-t region.     

Determination of sodium in sodium amalgam by measurement of the thermo-electric potential

Summary A fast method for the determination of the sodium content of sodium amalgam is based on the almost linear part of the relationship between the thermo-electric potential (T.E.P.) and the sodium content. An apparatus was constructed which has been successfully used in a mercury-brine electrolysis plant for several months. The speed of analysis is 120 samples/h. The mean deviation is ± 5% for the sodium content range of 0.1 to 0.4% by weight.

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Bestimmung von Natrium in Natriumamalgam durch Messung des thermoelektrischen Potentials

Zusammenfassung Das beschriebene Verfahren zur schnellen Messung des Natriumgehalts von Natriumamalgam beruht auf dem nahezu linearen Teil der Beziehung zwischen dem Thermoelektrischen Potential (T.E.P.) und dem Natriumgehalt. Die entwickelte Apparatur ist seit mehreren Monaten bei einer Anlage zur Chloralkali-Elektrolyse in Gebrauch. 120 Proben können in 1 h gemessen werden. Der mittlere Fehler beträgt ± 5% bei einem Natriumgehalt von 0,1–0,4 Gew-%.

     

Values for the transport coefficients of a neutrino-antineutrino system

The transport coefficients of a neutrino-antineutrino mixture are calculated numerically in successive orders of approximation for various compositions of the system. A cosmological application is suggested.