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  • Phloem Ultrastructure and Pressure Flow ... - Plant Cell

    Since the first ultrastructural investigations of sieve tubes in the early 1960s, their structure has been a matter of debate. Because sieve tube structure defines frictional interactions in the tube system, the presence of P protein obstructions shown in many transmission electron micrographs led to a discussion about the mode of phloem transport.

  • Agglomeration economies: ambiguities and confusions

    plant or commonly located plants, producing electricity generators and pumping machinery, with specialised design expertise representing the shared (but indivisible Table 1. Underlying bases for agglomeration economies to the firm. Dimension Spatially constrained Spatially constrained internal economies external economies