Seawalls do not sustain viable populations of limpets

Do interictal spikes sustain seizures and epileptogenesis?

Interictal spiking is seen in the EEG of epileptic patients between seizures. To date, the roles played by interictal events in seizure occurrence and in epileptogenesis remain elusive. While interictal spikes may herald the onset of electrographic seizures, experimental data indicate that hippocampus-driven interictal events prevent seizure precipitation. Even less clear than the role of inter...

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Design a clocked synchronous state machine with four inputs, G1–G4, that are connected to pushbuttons. The machine has four outputs, L1–L4, connected to lamps or LEDs located near the like-numbered pushbuttons. There is also an ERR output connected to a red lamp. In normal operation, the L1–L4 outputs display a 1-out-of-4 pattern. At each clock tick, the pattern is rotated by one position; the ...

Effects of Patch-Size on Populations of Intertidal Limpets, Siphonaria spp., in a Linear Landscape

Organisms with different life-histories and abilities to disperse often utilise habitat patches in different ways. We investigated the influence of the size of patches of rock (separated by stretches of sand) on the density of pulmonate limpets (Siphonaria spp.) along 1500 km of the linear landscape of the South African coastline. We compared the influence of patch-size on two congeneric specie...

On the planetary capacity to sustain human populations

This essay investigates the limiting capacity of the planet to support humans, making various assumptions about current practices and the intensities of per caput resource consumption. Supposing people to be exclusively vegetarian, consuming cereals produced by present methods, at the highest reported yields, and also eschewing the cultivation of non-edible crops, the Earth is argued to be capa...

Collaboration and Partnerships Are Essential to Sustain Wild Tiger Populations