14: Physical limits on plant size and their organs, 16.08.2017

Transport Phenomena in the Biosphere

14 | 0:00:00 Start 0:01:52 Literature 0:01:55 Centennial of On Growth and Form by D'Arcy Thompson 0:02:44 Question: Why no wheels in nature? 0:03:31 Example: Why no wheels? 0:04:37 Question: What drives evolution in biological systems? 0:04:54 Energetics of Evolution 0:06:50 Example: Size of living organisms 0:07:29 Bacterial size limited by feeding strategy 0:11:12 Sugar transport 0:11:45 The leaf is an osmotic pump 0:12:42 First mathematical model 0:14:24 Later mathematical model 0:15:14 Phloem models are complex 0:15:54 Resistor model for phloem flow speed 0:18:09 Optimal design of an osmotic pump 0:22:04 Physical limits to leaf size 0:22:59 Theophrastus, 350 BC 0:26:22 The global spectrum of plant form and function 0:27:55 Resistor model for phloem flow speed 0:28:56 limits to leaf size 0:30:29 Upper limits to leaf size 0:31:07 Lower limits to leaf size 0:35:09 Can we engineer plants that produce more sugar? 0:36:09 Drawing ''blood'' from a plant 0:36:41 Plants treat fluorescein as sugar! 0:38:04 Confocal Microscope – Photobleaching 0:38:58 Microfluid model 0:39:58 Plant sugar concentration 0:41:23 Sugar flow in plants 0:42:38 Sugar mass flow 0:42:56 Plants are optimized for efficient transport 0:43:54 Crop plants have highest concentration 0:44:40 iPhloem 2017