A barrier (seal) must form at the cut ends of a severed axon if a neuron is to survive and eventually regenerate. Following severance of crayfish medial giant axons in physiological saline, vesicles accumulate at the cut end and form a barrier (seal) to ion and dye diffusion. In contrast, squid giant axons do not seal, even though injury-induced vesicles form after axonal transection and accumu...

Cyclic microfracturing and epitaxial crystal growth have long been recognized in crack-seal veins, but an understanding of a single cycle is still missing. Here we present phase-field model that includes both fracture mechanics crack propagation, on the walls, repeating this multiple times polycrystalline, microporous quartz rock. Our simulations two end members: If vein completely seals, it st...

SEAL was first introduced in [1] by Rogaway and Coppersmith as a fast software-oriented encryption algorithm. It is a pseudorandom function which stretches a short index into a much longer pseudorandom string under control of a secret key pre-processed into internal tables. In this paper we first describe an attack of a simplified version of SEAL, which provides large parts of the secret tables...

SEAL was rst introduced in 1] by Rogaway and Copper-smith as a fast software-oriented encryption algorithm. It is a pseu-dorandom function which stretches a short index into a much longer pseudorandom string under control of a secret key pre-processed into internal tables. In this paper we rst describe an attack of a simpliied version of SEAL, which provides large parts of the secret tables fro...

I had come to see the gray seals (Halichoerus grypus; Figure 1) that live along coast of Pembrokeshire in far west Wales, and was not disappointed. A wild, windblown seascape with steep cliffs, small islands, coves inaccessible by land, it is home dolphins, porpoises, an extensive cast seabirds, some 5000 seals. Tiny stone cottages belonged people who made a living long ago taking rowboats onto...