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SIEVE ELEMENTS IN THE FUCALES
Author(s) -
MOSS BETTY L.
Publication year - 1983
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1983.tb03443.x
Subject(s) - fucales , thallus , cryofixation , protein filament , sieve (category theory) , transmission electron microscopy , sieve tube element , ultrastructure , botany , biology , biophysics , chemistry , materials science , composite material , nanotechnology , algae , mathematics , phloem , combinatorics
SUMMARY Medullary filaments from the thalli of most of the British species of brown seaweeds belonging to the Fucales have been examined with both scanning and transmission electron microscopy (SEM and TEM). The end walls of each cell in the filament are in the form of a sieve plate. The pores, each 0.1 μm or less in diameter, are irregular in size, shape and distribution across the sieve plate. Through these small pores there is continuity of the cytoplasm. The medullary filaments provide an anatomical system throughout the thallus through which translocation can take place.