The optical properties of a caesium atomic beam driven on a resonant hyperfine transition in the D(2) line were studied as a function of the probe laser frequency. Using a third off-resonant laser system, a heterodyne interferometer allowed simultaneous absorption and phase shift measurements of either the probe or the coupling laser. The signal features of the probe and coupling laser transmit...

Almost all insect pest control programmes currently releasing sterile insects as part of the area-wide integrated application of the sterile insect technique (SIT) use radioisotope irradiators that are loaded either with cobalt-60 or caesium-137, which produce ionizing radiation consisting of gamma rays. Irradiators such as the Gammacell 220 have proven to be extremely reliable for the purpose ...

Penta-ammine dioxide uranium(V) nitrate ammonia (1/1), [UO2(NH3)5]NO3·NH3, was obtained in the form of yellow crystals from the reaction of caesium uranyl nitrate, Cs[UO2(NO3)3], and uranium tetra-fluoride, UF4, in dry liquid ammonia. The [UO2]+ cation is coordinated by five ammine ligands. The resulting [UO2(NH3)5] coordination polyhedron is best described as a penta-gonal bipyramid with the O...

The front end test stand is being constructed at the Rutherford Appleton Laboratory, with the aim of producing a 60 mA, 2 ms, 50 Hz, perfectly chopped H(-) ion beam. To meet the beam requirements, a more detailed understanding of the ion source plasma is required. To this end, an initial study is made of the optical spectrum of the plasma using a digital spectrometer. The atomic and molecular e...

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Chiroptical properties of natural DNA molecules differing in base composition were studied in solutions with high concentrations of monovalent sodium and caesium salts. It was found that the properties were dependent on the DNA base sequence and nature of both cations and anions. A comparison with the behaviour of the synthetic molecules of DNA demonstrated that the salt-induced changes in the ...

Radioactive contamination of the Pacific Ocean following the Fukushima nuclear accident has raised public concerns about seafood safety . Many people are wondering whether fish products from the Pacific Ocean and Japan are safe to eat 2 y after the accident. There is also some concern about seafood caught locally, outside of Japan. Based on monitoring data reported in July 2013, radioactive cae...

2-Amino-3-acylthiophenes are known to allosterically modulate the A(1) adenosine receptor and are also used as intermediates in the synthesis of therapeutic agents and pharmacophores such as thienoazepines and thienopyrimidines. The N-alkylation of 2-aminothiophenes has been notoriously difficult to accomplish under mild conditions and there are very few examples of N-alkylated 2-aminothiophene...

The membrane response to mechanical stimulation was investigated under voltage-clamp conditions in the hypotrich ciliate Stylonychia mytilus (Protozoa). The mechanoreceptor current shows high ionic selectivity, unlike than in metazoans. It is exclusively carried by potassium ions and is selectively inhibited by tetraethylammonium and 4-aminopyridine. Procaine, tetramethylammonium, caesium and d...

The effects of ethidium bromide were tested on isolated cockroach interganglionic connectives, either with the perineurium intact or desheathed. Intact connectives showed small, reversible depolarizations in response to 25 mM-ethidium. Desheathed connectives showed much larger, concentration-dependent depolarizations and the membrane potentials repolarized only slowly after washing out ethidium...