Levels in152Gd and152Sm populated by the decay of152Eu

The energy level schemes of¹⁵²Gd and¹⁵²Sm have been established on the basis of singlesγ-spectra, andγ- γ coincidence measurements. Ge(Li) detectors were used to study the gamma spectra produced in the EC/β⁺ and β^? decays of¹⁵²Eu to¹⁵²Sm and¹⁵²Gd, respectively. Thirteen new transitions are reported and data from eleven coincidence gates enabled five new levels to be suggested. Relative intensities and logf t values were calculated and spin/parities deduced. Comparisons are made with new predictions of the Interacting Boson Model.     

The titrimetric determination of copper(I), copper(II) and copper metal in admixture

Summary Copper(I) can be determined in the presence of copper(II) by oxidation with an excess of potassium iodate, the copper(II) being masked with oxalate. The unconsumed iodate is determined iodimetrically and the total copper is then determined on the same solution by demasking with acid and iodide, followed by iodimetric titration. The method can be extended to include elemental copper which can be separated from copper(I) and copper(II) oxides by dissolving the oxides in an ammonium chloride-ascorbic acid solution. The separated copper metal can then be determined by the iodate procedure. The methods are accurate and reproducible and have been applied to the determination of commercial copper(I) chloride, copper powder and partially oxidized copper powder. The relative standard deviation is about 0.35% in the range of 5.8–100 mg of Cu.

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Trimetrische Bestimmung von Kupfer(I), Kupfer(II) und metallischem Kupfer in Gemischen

Zusammenfassung Cu(I) kann in Gegenwart von Cu(II) durch Oxidation mit überschüssigem Kaliumiodat unter Maskierung des Cu(II) mit Oxalat bestimmt werden. Das unverbrauchte Iodat wird iodometrisch erfaßt und anschließend Gesamtkupfer in derselben Lösung iodometrisch nach Demaskierung mit Säure und Iodid bestimmt. Das Verfahren kann noch auf metallisches Kupfer erweitert werden, das von Cu(I)- und Cu(II)-oxiden abgetrennt wird, indem man letztere in Ammoniumchlorid-Ascorbinsäurelösung löst. Das elementare Kupfer wird dann mit Iodat bestimmt. Die Methoden sind genau und reproduzierbar und sind zur Analyse von handelsüblichem Kupfer(I)-chlorid, Kupferpulver und teilweise oxidiertem Kupferpulver angewendet worden. Die relative Standardabweichung liegt im Bereich von 5,8–100 mg Cu bei 0,35%.

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This paper is respectfully dedicated to Professor Dr. Herbert Weisz on the occasion of his 60th birthday.

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The authors are grateful to Emeritus Professor Ronald Belcher for his interest in this work.     

Effects of lipopolysaccharide-induced inflammation on expression of growth-associated genes by corticospinal neurons

Background  

Inflammation around cell bodies of primary sensory neurons and retinal ganglion cells enhances expression of neuronal growth-associated genes and stimulates axonal regeneration. We have asked if inflammation would have similar effects on corticospinal neurons, which normally show little response to spinal cord injury. Lipopolysaccharide (LPS) was applied onto the pial surface of the motor cortex of adult rats with or without concomitant injury of the corticospinal tract at C4. Inflammation around corticospinal tract cell bodies in the motor cortex was assessed by immunohistochemistry for OX42 (a microglia and macrophage marker). Expression of growth-associated genes c-jun, ATF3, SCG10 and GAP-43 was investigated by immunohistochemistry or in situ hybridisation.     

Preparation of poly(naphthylamine-formaldehyde); Application as a new and an effective inhibitor of steel in hydrochloride acid solution

In this research, we first prepared poly (naphthylamine-formaldehyde) (PNAF) and then investigated its corrosion inhibition properties for polished steel specimens in 1 M HCl solution using chemical and electrochemical methods. Results showed that the PNAF could serve as an effective inhibitor of the corrosion of steel in hydrochloric acid media (the inhibition efficiency of this polymer at an optimum concentration of 100 mg L^–1 was 99.9 %). The effect of temperatures on the corrosion behavior of steel was studied in the temperature ranging from 303 to 333 K for 1 M HCl at an optimum concentration of PNAF. It has been demonstrated that the adsorption behavior of this polymer on steel in 1 M HCl was found to obey Langmuir adsorption isotherm. Also, potentiodynamic polarization measurements showed that PNAF was a mixed type inhibitor.     

Beta-delayed proton emitter kr

The nucleide ⁷³Kr has been identified by on-line mass separation as a precursor of β-delayed proton emission. The proton branch is (6.8 ±1.2) × 10⁻³ proton/decay. The protons populate the ground state and also the first excited 2⁺ state at 866 keV in ⁷²Se with a relative intensity of (35±9) %. The value of Q_EC−B_p, where B_p is the proton separation energy for the nucleus ⁷³Br, is found to be 4.85 ±0.30 MeV based on the fraction of proton events preceded by positron decay.