By O. Stocker (auth.), Dr. M. J. Adriani, Docent Dr. H. C. Aslyng, Professor Dr. Hans Burström, Dr. Rudolf Geiger, Dr. Fritz Gessner, Univ.-Professor Dr. Otto Härtel, Dr. Bruno Huber, Dr. Magdalena Hülsbruch, Professor Dr. rer. nat. Kurt Kalle, Dr. H. Kern,
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Additional resources for Pflanze und Wasser / Water Relations of Plants
Sample text
Nachdem bereits im ersten Bande des Handbuches L. v. ERIOHSEN eine ausführliche Behandlung dieses Thema8 mit Zitaten der einschlägigen neuen Literatur gegeben hat, wird dem speziellen Bande "Pflanze und Wasser" nur eine kurze Einführung über die Struktur des Wassers vorausgeschickt. Im übrigen aber sei hinsichtlich eingehender Behandlung auf diesen Artikel verwiesen 1. Je nach den Erfordernissen wird der Pflanzenphysiologe das Wasser als stoffliches Kontinuum betrachten oder seine molekulare Struktur berücksichtigen müssen, um die Probleme der biologischen Feinstruktur und ihrer Veränderlichkeit, die durch Stoffaustausch, Stoffwechsel und ähnliches bedingt sind, sowie diejenigen, die reizphysiologischen Vorgängen zugrunde liegen, erörtern zu können.
Since ions are highly polar, they cannot pass through the lipid phase of the membrane. On the other hand, their ability to pass through the aqueous "pores" depends not on the size of the naked ion, but on the size of the hydrated ion, since it moves together with its water shell. e. the ion together with its water shell may be larger than the unionized molecules from which it originates. Weak electrolytes (acids, bases) therefore penetrate more readily than strong electrolytes, since the former consist mainly of undissociated molecules which are effectively smaller than the hydrated ions.
H-O-H r -+ H-O-H-O! H H + 10 I r - r I Auf diese Weise wird aus dem normalen Wassermolekül, dem "Monohydrol" , ein doppeltes Wassermolekül oder "Dihydrol". In entsprechender Weise kann dann auch das andere noch freie Elektronenpaar des Sauerstoffes reagieren und 12 H. ULLRICH: Die Struktur des Wassers. , was also schließlich zu Polyhydrolen führen kann. Diese "Verbindungen" sind infolge der schwachen Bindungsart - daher die Benennung Wasserstojjbrücke - sehr labil, und das die Brücke bildende Atom bzw.