Zobrazeno 1 - 8
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pro vyhledávání: '"M. Th. M. Willemse"'
Autor:
M. Th. M. Willemse, J. M. Denuce
Publikováno v:
Development, Growth and Differentiation. 15:169-177
Many teleost embryos produce an enzyme within specialized glands, which facilitate hatching. The enzyme attacks the chorion which becomes so weak that it may be ruptured easily by a blow of the tail. The embryos of Brachydanio rerio, Danio malabaricu
Autor:
M. Th. M. Willemse
Publikováno v:
Acta Botanica Neerlandica. 20:411-427
SUMMARY A morphological study was made with respect to the changes during microsporogenesis of Pinus sylvestris L. from prometaphase I until the tetrad stage. Described and discussed are the breakdown and rebuilding of the nuclear membrane, the mixin
Autor:
M. Th. M. Willemse
Publikováno v:
Acta Botanica Neerlandica. 20:611-623
SUMMARY After zygotene the tapetal cell becomes osmiophilic. The electron density of the cytoplasm decreases during the early tetrad stage and increases afterwards. During the young microspore stage the tapetal cell degenerates. The electron density
Autor:
M. Th. M. Willemse
Publikováno v:
Acta Botanica Neerlandica. 21:17-31
SUMMARY The morphological changes in the nucleus and cell organelles of Gasteria during the development of the pollen mother cell into the ripe pollen are described and discussed. From the tetrad stage till after the first mitotic division the plasti
Autor:
M. Th. M. Willemse
Publikováno v:
Acta Botanica Neerlandica. 21:1-16
SUMMARY Measurements were made of the spectral maximum, the intensity, and fading of the auto-fluorescence spectrum during microsporogenesis and of pollen after some chemical treatments in Gasteria, Pinus, Physostegia, and some other plants. Mainly t
Autor:
M. Th. M. Willemse
Publikováno v:
Acta Botanica Neerlandica. 20:498-523
SUMMARY A description and discussion are given of the morphological changes of the cell organelles during the middle and late tetrad stage and the young microspore of Pinus sylvestris with special reference to the pollen wall formation. In the middle
Autor:
M. Th. M. Willemse
Publikováno v:
Acta Botanica Neerlandica. 20:261-274
SUMMARY The membrane-like structures in the nucleus, the nuclear pore, the disappearance of the nuclear membrane, the synaptinemal complex, and changes in the nucleolus and karyoplasm are described and discussed. Plastids and mitochondria do not chan
Autor:
M. Th. M. Willemse, H. F. Linskens
Publikováno v:
Die Naturwissenschaften. 55(8)