Confocal image of a squid embryo. All nuclei are stained with DAPI (blue). Phalloidin staining reveals neural structures (red), while cilia on the surface of the embryo are highlighted by acetylated tubulin staining (green).
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Euprymna berryi is a species of bobtail squid, which are part of a group of cephalopods closely related to cuttlefish. Bobtail squid tend to have a rounder mantle than cuttlefish and have no cuttlebone. They have eight suckered arms and two tentacles and are generally quite small.
Bobtail squid have a symbiotic relationship with bioluminescent bacteria (Vibrio fischeri), which inhabit a special light organ in the squid’s mantle. The bacteria are fed a sugar and amino acid solution by the squid and in return hide the squid’s silhouette when viewed from below by matching the amount of light hitting the top of the mantle.
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An Emperor Shrimp (Periclimenes imperator) on its host nudibranch (Mexichromis multituberculata), Seraya, Bali
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出典: rhamphotheca
Susceptibility to Disease May be a Better Option
When battling a deadly parasite epidemic, less resistance can sometimes be better than more, a new study suggests. A freshwater zooplankton species known as Daphnia dentifera endures periodic epidemics of a virulent yeast parasite that can infect more than 60 percent of the Daphnia population. During these epidemics, the Daphnia population evolves quickly, balancing infection resistance and reproduction.
A new study reveals that the number of vertebrate predators in the water and the amount of food available for Daphnia to eat influence the size of the epidemics and how these “water fleas” evolve during epidemics to survive.
Read more: http://www.laboratoryequipment.com/news-Population-Stresses-Affect-Disease-Susceptibility-in-Animals-040212.aspx
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