Efficient path planning and navigation is critical for animals, robotics, logistics and transportation. We study a model in which spatial navigation problems can rapidly be solved in the brain by parallel mental exploration of alternative routes using propagating waves of neural activity. A wave of spiking activity propagates through a hippocampuslike network, altering the synaptic connectivity...

Fresh cows' milk (ii) 2 19 4 8 3/9 5/9 Cow and Gate full-cream (ii), a 3 8 5 2 4/5 6/10 b 2 12 3 18 3/3 5/C 2 4 3 6 2/7 4/1 X Ostermilk No. 2 (ii), b 2 12 3 18 3/3 5/C2 0 3 0 2/4 3/7 Trufood full-cream (ii) 4 3 6 5 5/7 8/7 National Dried Milk, full-cream (ii) 1 8 2 2 3/8 4/6 F Cow and Gate half-cream, a 5 5 7 18 7/4 11/2 b 3 19 5 18 5/4 8/1 C 3 5 4 17 4/3 6/6 C) Ostermilk No. 1, b 3 19 5 16 5/4...

8 9 A comparison was made between the composition of the recalcitrant organic matter (ROM) 10 isolated from a sandy forest soil as revealed by microwave assisted extractions and/or 11 hydrolyses and by usual pyrolysis techniques. Successive microwave irradiation treatments 12 were performed in H2O, 0.1 and 1 M HCl and 0.1 and 1 M KOH. At each step of the 13 treatment the insoluble residue was e...