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Although the subject of wave propagation in solids has a long history, the classical theory of elastic waves having been developed in the nine­ teenth century by STOKES, POISSON, RAYLEIGH and KELVIN, the last two decades have seen a remarkable revival of interest in this subject among both theoreticians and experimenters. There' are a number of reasons for this, first, experimental methods for the generation and detection of high frequency mec...

Language can be simultaneously both a support and a hindrance to students’ learning of mathematics. When students have sufficient fluency in the mathematics register so that they can discuss their ideas, they become chiefs who are able to think mathematically. However, learning the mathematics register of an Indigenous language is not a simple exercise and involves many challenges not only for students, but also for their teachers and the wide...

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The cyanogenic glycosides, here defined as glycosidic derivatives of iX-hydroxynitriles, represent a rather limited class of natural products, which are widely distributed in the plant kingdom and, to a small ex­ tent, even in animals. A characteristic feature of these glycosides is their ability to release hydrocyanic acid on treatment with dilute acids or appropriate enzymes. The term "cyanogenic" is used to designate this property, regardle...

Deutsche Schlager Legenden: Die größten Hits von Stars aus frühen Zeiten. Hören Sie die schönsten Hits von Johannes Heesters, Ilse Werner, Willi Forst, Ralf Bendix und Heinz Ehrhardt!

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In dem Band XV /2 des Handbuches der medizinischen Radiologie wurden bei der klini­ schen Nuklearmedizin bewuBt einige Kapitel herausgenommen, urn die weitere Entwicklung auf diesen Gebieten abzuwarten. Der vorliegende Band beinhaltet diese Kapitel. Die nuklear­ medizinische Herz- und Kreislaufdiagnostik hat sich in der Zwischenzeit zu einem der drei wichtigsten diagnostischen Gebiete der Nuklearmedizin entwickelt. Dies nicht nur im Hin­ blick...

Die Pappel entläßt ihre Flocken, tropfenschwerer Tau, ein Kügelchen Flüssigkeit im Leib des Falters und das Wort, das durch die Steppe streift - mit Arsenij Tarkowskijs Poesie schlagen wir das Buch der ewigen Wunder auf und treten ein in den »weißen, weißen Tag«. Traum und Wirklichkeit, Sinn, Vergeblichkeit und das Ewige, die Erinnerung an die Kindheit und an eine geheime Liebe, an »jene, die er zärtlich und unglücklich liebte« - das sind Them...

343 Whilst this may be so it is also true that this in itself is not sufficient to deter­ mine it completely. In fact the extent of the dead air region and the behaviour of the shear layer are also of prime importance and in short a unified treatment comprising external flow, boundary layer, shear layer and dead air region becomes necessary to complete the investigation. This would take us outside the scope of the present article and for the s...

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Arno Design (Mirka Nassiri, Claus Neuleib, Peter Haberlander) steht seit vielen Jahren für spektakuläre Lösungen bei der Gestaltung und Realisierung von Messeständen, Eventarchitektur, Showrooms und Shops. Zum 20-jährigen Bestehen zeigt diese Publikation die Vielfalt des gesamten Schaffens für ein breites Spektrum von Kunden aus den Bereichen Mode, Sport, Industrie und Kommunikation. Dabei werden viele Firmen wie z.¿B. Mercedes-Benz, Yves Sain...

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This volume contains the Proceedings of the 25th Mosbach Colloquium, the general theme of which is the Biochemistry of Sensory Functions. It was intended, continuing the silver-tradition of these Colloquia, to provide the uninitiated biochemist with an insight into the current status of a line of research in Molecular Biology which, more than many other fields in Biochemistry, has maintained its contacts with and respect for Physiology. The sp...

It is also possible that contractile vacuoles originate by some form of phase separation not yet understood and possibly involving the contractile properties of proteins, and' it is possible that this process continues to operate in the walls of the vacuoles or feeder canals. This secretory process may be the function of that part of the vacuolar apparatus which blackens on impregnation with osmic acid, and which seems to possess some degree o...

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Mit Beiträgen zahlreicher Fachwissenschaftler

If, following the solvent extraction of a hydrocarbon from a plant, it is not known whether it is one or the other, a method of distinguishing the two is described by HENDRICKS, WILDMAN and JONES (1946). The technique involves the infra-red absorption spectra of the two isomers. At about 12 mp. the relative absorption coefficient of rubber is 42% greater than for gutta. ScHLESINGER and LEPER (1951) describe two procedures for separation of the...

Sourcebook and exhibition catalogue function together as a two-volume set that comprises the project laid out in the exhibition James Lee Byars: 1/2 an Autobiography, presented collaboratively by Museo Jumex in Mexico City and at MoMA PS1 in New York. The publications will add significantly to the existing scholarship on the life and work of the artist James Lee Byars, as both contain central and previously unpublished material. The Sourcebo...