By Martin Hewings

A completely up-to-date model of the hugely profitable grammar name. This new revised version focuses particularly at the complexities of grammatical offerings that complex scholars have to enjoy. it is also a accomplished uncomplicated Grammar Reference so scholars can simply evaluation their figuring out of language parts they've got formerly studied.

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Springer, Berlin Etkin W (1973) BioScience 23:652–653 Kelln RA, Gear JR (1980) BioScience 30:110–111 16 1 Theoretische Grundlagen und Zielsetzung der Physiologie Kreutz W (1966) Umschau 66:806–813 Mohr H (1970) Beilage zu Naturwiss Rdsch, Stuttgart, Heft 7 Mohr H (1972) Lectures on photomorphogenesis. Springer, Berlin Mohr H (1977) Lectures on structure and significance of science. Springer, Berlin Schopfer P (1986) Experimentelle Pflanzenphysiologie, Bd 1: Einführung in die Methoden. Springer, Berlin Swanson CP (1960) In: McElroy WD, Swanson CP (eds) The cell.

Generell dürfte das Mikrotubuliskelett bei Pflanzenzellen (deren äußere Form ja durch die Zellwand festgelegt wird) der mechanischen Stabilisierung des Ectoplasmas dienen und darüber Abb. 7. Strukturmodell eines Mikrotubulus. Der Hohlzylinder besteht aus 13 Längsreihen (Protofilamenten) von Tubulinuntereinheiten. Da die Protofilamente leicht gegeneinander versetzt sind, ergibt sich eine helicale Superstruktur. Ein Heterodimer aus α- und β-Tubulin (jeweils 50 kDa) bildet den Grundbaustein der Protofilamente.

In der Zelle liegt ein dynamisches Gleichgewicht zwischen freiem und aggregiertem Tubulin vor. 6). Sie legen in vielen wachsenden Zellen die Orientierung der neu gebildeten Cellulosefibrillen in der Zellwand fest (→ S. 106). Darüber hinaus besitzen Mikrotubuli zentrale Funktionen bei der Kernteilung und der Zellteilung (→ S. 31). Die antimitotische Wirkung von Colchicin, einem in den Blättern der Herbstzeitlose gebildeten Alkaloid, beruht darauf, dass diese Substanz spezifisch an das freie Tubulin bindet und dadurch das Wachstum der Mikrotubuli verhindert.

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