Phloem Transport
Active infrastructure for high-value, low-volume goods requiring precise routing.
Phloem transports sugars from leaves to roots/fruit. Direction: Bidirectional (can flow up or down based on source-sink dynamics). Mechanism: Pressure flow hypothesis (Münch 1930) - sugars loaded at leaves (source) create high osmotic pressure, water follows, pressure pushes sap toward roots/fruit (sink). Contents: Sugars (10-30% concentration), amino acids, hormones, signaling molecules, RNA. Structure: Living cells (sieve tube elements with companion cells for metabolic support). Pressure: Positive (+10 to +30 atmospheres at source). Speed: 50-100 cm/hour. Design principle: Phloem is active - cells actively load/unload sugars, requires ATP. Active transport enables precision (direct sugars to growing fruit, not random distribution).
Business Application of Phloem Transport
Active infrastructure for high-value, low-volume goods requiring precise routing. Like air freight, armored trucks, or refrigerated transport - expensive but controlled. Use for valuables, perishables, and bidirectional flows.