Die wachstumsfördernde Wirkung von Tannin auf Getreidekoleoptilen

Zusammenfassung Schwach konzentrierte Tanninlösungen (5·10^–5 bis 5·10^–8 molar) vermochten das Wachstum 10 mm langer Koleoptilabschnitte von 15 Kulturformen vonAvena sativa, Hordeum distichon, Hordeum vulgare, Zea mays, Triticum aestivum undSecale cereale um etwa 6–25% zu fördern. Die mögliche Beteiligung von Gerbstoffen am Streckungswachstum höherer Pflanzen wurde diskutiert.

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Summary The growth of 10 mm coleoptile sections of 15 cultivars ofAvena sativa, Hordeum distichon, Hordeum vulgare, Zea mays, Triticum aestivum andSecale cereale was stimulated by dilute tannin-solutions (5·10^–5 to 5·10^–8 molar) from 6 up to 25%. The possible role of tannins in elongation growth of higher plants was discussed.

     

A propos de quelques groupements végétaux observés entre monaco et gênes

Résumé Le climat chaud et humide de la Ligurie méditerranéenne détermine la réapparition de quelques groupements végétaux connus de la Catalogne et rares ou nuls en Languedoc: Inulo-Oryzopsietum miliaceae, Cichorio-Sporoboletum poiretii, Hyparrhenietum hirto-pubescentis, Rubo-Coriarietum.Le caractère particulier de la végétation ligure a été exprimé par des groupements spéciaux: Pistacio-Rhamnetum alaterni, qui remplace le Quercetum cocciferae, groupements à Ostrya carpinifolia et à Brachypodium pinnatum des endroits frais, groupements buissonnants à Erica arborea et Genista germanica, à Rosmarinus et Genista cinerea, Asplenio-Campanuletum macrorhizae des rochers, etc.

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Summary The warm and humid climate of the Mediterranean Liguria determines the reappearance of some communities, known in Catalonia, and seldom or not existing in Languedoc: Inulo-Oryzopsietum miliaceae, Cichorio-Sporoboletum poiretii, Hyparrhenietum hirto-pubescentis, Rubo-Coriarietum.The particular character of the Liguric vegetation is expressed in special communities: Pistacio-Rhamnetum alaterni, which replaces the Quercetum cocciferae, communities with Ostrya carpinifolia and with Brachypodium pinnatum in the fresh places, bushy communities with Erica arborea and Genista germanica, with Rosmarinus and Genista cinerea, Asplenio-Campanuletum macrorhizae of the rocks, and so on.

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Zusammenfassung Das warme und feuchte Klima der mediterranen Ligurie bestimmt das Wiedererscheinen einiger Pflanzengesellschaften, die in Katalonien bekannt sind, aber selten oder nicht in Languedoc vorkommen: Inulo-Oryzopsietum miliaceae, Cichorio-Sporoboletum poiretii, Hyparrhenietum hirto-pubescentis, Rubo-Coriarietum.Der eigenartige Charakter der ligurischen Vegetation ist in besonderen Pflanzengesellschaften ausgedrückt: Pistacio-Rhamnetum alaterni, das das Quercetum cocciferae ersetzt, Gesellschaften mit Ostrya carpinifolia und mit Brachypodium pinnatum der frischen Standorte, Erica arborea-Genista germanica-Silikatbodengebüsche, Rosmarinus-Genista cinerea-Kalkbodengebüsche, Asplenio-Campanuletum macrorhizae der Felsen usw.

     

Reduction of a Tetrazolium Salt in Determining Growth Activity of Yeast-Phase Histoplasma capsulatum

A colorimetric method using a tetrazolium compound, 3,4,5-dimethylthiozalil-(1 or 2),2,5-diphenyltetrazolium bromide (TTBr), was developed for studying the growth activity of yeast-phase Histoplasma capsulatum. Materials extracted in phosphate buffer, pH 7.0, from cells at different stages of growth reduced TTBr. Colorimetric changes were correlated with enzymatic activity. Under standardized conditions specified herein, the optical density of the reduced tetrazole was an index of the growth activity of the organism.     

An Improved Diluent for Rubella Hemagglutination and Hemagglutination-Inhibition Tests

Rubella hemagglutinating (HA) antigen was prepared in BHK-21 tissue as 5% cell suspensions and from unconcentrated and 20× concentrated infected supernatant fluids. In some instances, unconcentrated fluids were treated with Tween 80 and ether; cell suspensions were treated with ether alone. Preparations were tested for HA activity in dextrose-gelatin-Veronal (DGV) buffer solutions; 0.85% NaCl; Sorenson's phosphate-buffered saline, pH 7.2; and a diluent of 0.9% NaCl, 0.1% CaCl₂ (anhydrous), and 0.1% MgSO₄·7H₂O. HA titers were consistently two- to fourfold higher in the saline with added Ca⁺⁺ and Mg⁺⁺ than in DGV. Hemagglutination-inhibition titers of paired human sera were the same in either diluent. It is suggested that the interaction between rubella HA antigen and the red cells of young (less than 1-day-old) chicks may be at least partially ion dependent and that titers are enhanced by increased quantities of divalent cations.