White dwarfs sing the blues

Article Abstract:

The predictable cooling rate of the burnt-out cores of middleweight stars, known as white dwarfs, means that their temperature can be used to determine their age, although this can be difficult. New evolutionary models of white dwarfs have been developed which include a detailed model atmosphere linked to the interior. The spectrum of escaping light and the rate of energy leakage are mostly controlled by the atmosphere. The new model predicts that the oldest white dwarfs appear blue and should help determine the age of the Universe.

White dwarfs, Spectra, Dwarf stars

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Axonal site of spike initiation enhances auditory coincidence detection

Article Abstract:

Neurons behave as coincidence detectors for sound source localization and encode interaural time differences (ITDs) separately at each characteristic frequency (CF) in nucleus laminaris of birds. It is however shown that in nucleus laminaris of the chick, the site of spike initiation in the axon is arranged at a distance from the soma, so as to achieve the highest ITD sensitivity at each CF.

Science & research, Neurons, Axonal transport

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