Ultrastructural characteristics of Betula pendula tapetum and pollen grains after rapid freezing and freeze-substitution

Author: Cresti Mauro   El-Ghazaly Gamal   Milanesi Claudio   Walles Björn  

Publisher: Taylor & Francis Ltd

ISSN: 0017-3134

Source: Grana, Vol.38, Iss.4, 1999-07, pp. : 194-202

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Abstract