Der mikrochemische Nachweis des Anabasins und seine Unterscheidung von Nikotyrin und Nikotin

Zusammenfassung Das Problem des Nachweises von Anabasin und seiner Unterscheidung von den Alkaloiden Nikotin und Nikotyrin wurde untersucht. In der Goldbromwasserstoffsäure, Platinbromwasserstoffsäure, Wismutbromwasser-stoffsäure und im Cadmiumbromid wurden Reagenzien gefunden, die für den Nachweis und die Unterscheidung dieser Alkaloide sehr gut geeignet sind.Das Verhalten des Nikotins mit zahlreichen Reagenzien wurde eingehend untersucht. Einige der hierbei erhaltenen Verbindungen wurden beschrieben.

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Summary The problem of detecting anabasin and its differentiation from the alkaloids nicotine and nicotyrine was studied. Auribromhydric acid, bromoplatinic acid, bromobismuthic acid and cadmium bromide were found to be reagents suitable for the detection and differentiation of these alkaloids.An extended study was made of the behavior of nicotine toward numerous reagents. Some of the compounds obtained in this investigation are described.

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Rèsumè Etude du problème de l'identification de l'anabasine et de sa différenciation des alcaloïdes nicotine et nicotyrine. On a constaté que les acides aurichlorhydrique, platibromhydrique, bismuthobromhydrique, et le bromure de cadmium étaient des réactifs convenant parfaitement à l'identification et la différenciation de ces alcaloïdes. Le comportement de la nicotine en présence de nombreux réactifs a été soigneusement étudié. L'auteur décrit les combinaisons obtenues lors de ces réactions.

     

Low-Energy Kaon�CNucleon/Nuclei Interaction Studies at DA��NE (SIDDHARTA and AMADEUS Experiments)

The DA??NE electron?Cpositron collider at the Laboratori Nazionali di Frascati of INFN has made available a unique quality low-energy negative kaons ??beam??. The SIDDHARTA experiment used this beam to perform unprecedented precision measurements on kaonic atoms, while the AMADEUS experiment plans to perform in the coming years precision measurements on kaon?Cnuclei interactions at low-energies, in particular to study the kaonic nuclei. The two experiments are briefly presented in this paper.     

Analysis of a model for transport of charged particles in a random magnetic field

A model for the transport of charged particles in a random magnetic field is a Volterra integrodifferential equation with a long-range kernel. The integrodifferential equation is solved numerically with the method of Bellman, Kalaba, and Lockett (“Numerical Inversion of the Laplace Transform,” Elsevier, New York, 1966). The results are shown to be in excellent agreement with analytical asymptotic results.     

Interconversion of benzofurazandione monoximes

The preparation of 5-hydroxy-4-nitroso- and 7-hydroxy-4-nitrosobenzofurazan as well as of their 6-chloro and methyl derivatives is described and the oxime structure of these compounds is established. NMR spectra of benzofurazan-4,5-dione-4-monoxime and benzofurazan-4,7-dione-4-monoxime show evidence for an interconversion, in solution, of two monoximes, the 4,5- and 4,7-derivative prevailing in organic solvents and aqueous alkaline media, respectively. Chloro and methyl derivatives of benzofurazan-4,5- and 4,7-dione-4-monoximes show a similar interconversion in organic solvents.     

New precision measurements of the strong interaction in kaonic hydrogen

The DEAR experiment performed at the DAΦNE electron-positron collider (Frascati, Italy) studied the strong interaction shift and width of the 1s state in kaonic hydrogen using X-ray spectroscopy. The repulsive character of the kaon-proton interaction at threshold was confirmed and the most precise values of the shift and width were obtained. However, high precision data at the percent level are highly requested to further develop the theories and thus our understanding of the low-energy antikaon-nucleon interaction. Therefore, a new series of precision experiments on kaonic hydrogen and kaonic deuterium are planned at LNF.     

Thermoanalytical and microscopical investigation of the microstructure of emulsions containing polymeric emulsifier

Polymeric emulsifiers provide exceptional stability to oil-in-water, water-in-oil or multiple emulsions by their steric stabilization. Pemulens as polymeric emulsifiers are able to stabilize o/w type emulsions because their short lipophilic part integrates into the oil droplets while their long hydrophilic part forms a micro gel around the droplet. In our present study the microstructure and integration of the polymeric emulsifier at the water-oil interface was investigated with thermogravimetric and microscopical methods. It was established that depending on the amount of both of the polymeric emulsifier and added coemulsifier the microstructure of the system changes.