About turn for supercontinents

True polar wander and supercontinents

I present a general model for true polar wander (TPW), in the context of supercontinents and simple modes of mantle convection. Old, mantle-stationary supercontinents shield their underlying mesosphere from the cooling effects of subduction, and an axis of mantle upwelling is established that is complementary to the downwelling girdle of subduction zones encircling the old supercontinent. The u...

About turn: how object orientation affects categorisation and mental rotation.

High-density ERPs evoked by rotated alphanumeric characters were examined to determine how neural processing is affected by stimulus orientation during letter/digit classifications and during mirror/normal discriminations. The former task typically produces response times that are unaffected by stimulus orientation while the latter is thought to require mental rotation. Sensitivity to orientati...

Mitochondrial mutations in mammalian aging: an over-hasty about-turn?

The very low abundance of mitochondrial DNA (mtDNA) mutations in nearly all mammalian tissues even in old age has led most mitochondriologists to reject the idea that such mutations might have a causal role in aging, despite (1) the strong circumstantial (e. g., interspecies) evidence that they do have such a role, (2) the promulgation since 1998 of two detailed mechanisms whereby low levels of...

Mitochondrial mutations in mammalian aging: an over- hasty about-turn?

The very low abundance of mitochondrial DNA (mtDNA) mutations in nearly all mammalian tissues even in old age has led most mitochondriologists to reject the idea that such mutations might have a causal role in aging, despite the strong circumstantial (e.g. interspecies) evidence that they do have such a role, the promulgation since 1998 of two detailed mechanisms whereby low levels of mtDNA mut...

To the Framingham data, turn, turn, turn.