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5-7 nm filamentous active secretion albuminous cells aldehyde fixative angio aphid stylets arrows artifacts bidirectional transport callose deposition cambium carbohydrate chloroplast companion cells CC courtesy of Dr cytoplasmic streaming demonstrate differentiation electron micrograph electron microscope endoplasmic reticulum tubules evidence exudate fibrillar fixation flow of solution fluorescent Golgi bodies gymnosperm hypothesis ice crystal Light micrographs light microscope liquid nitrogen longitudinal periodicity Mass flow material mature sieve tube membrane micro Micrographs by courtesy mitochondria Munch nm in diameter nucleus nutrient observed rate occur organelles osmotic pressure gradient P-protein aggregates P-protein fibrils petioles phloem cells phloem parenchyma phloem tissue plasmalemma plasmodesmata plastids pore diameter produced protein protoplasmic streaming radioactive replica resistance to flow ribosomes sieve element sieve plate pores sieve pores sieve tube lumen sieve tube system source and sink species sperm starch grains stem structure sucrose suggested sycamore Thaine tion tracer translocation transverse section usually vacuole vascular bundle vivo Weatherley