PER protein in silkmoths marches to different drummer

Article Abstract:

Steven Reppert et al claim that biological clocks in the silkmoth work by a different mechanism than Drosophila melanogaster, which had been hoped to be a widely applicable model. The PER protein cycles in and out of the nuclei in the silkmoth eye, but not in brain cells, as it does in the fruit fly.

Biological rhythms, Biorhythms, Silkworms

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Ecdysis control sheds another layer

Article Abstract:

Dusan Zitnan and his colleagues have identified a second hormone necessary to trigger the ecdysial process, which enables the butterfly to shed its old cuticle. This Manduca sexta ecdysis-triggering hormone (Mas-ETH) is released from the Inka cells, a set of peripheral secretory cells.

Developmental biology, Insects, Ecdysis

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Microlensing sheds light on dark matter

Article Abstract:

Gravitational lenses, only recently observed, may give clues to the nature of the dark matter of the universe. Results from the Massive Compact Halo Object suggest many dark, compact objects that split images coming from objects further in space.

Dark matter (Astronomy), Gravitational lenses

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