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The planarian has a soft, flat, wedge-shaped body that may be black, brown, blue, gray, or white. The blunt, triangular head has two ocelli (eyespots), pigmented areas that are sensitive to light. There are two auricles (earlike projections) at the base of the head, which are sensitive to touch and the presence of certain chemicals.
Bipalium is a genus of large predatory land planarians. They are often loosely called "hammerhead worms" or "broadhead planarians" because of the distinctive shape of their head region. Land planarians are unique in that they possess a "creeping sole", a highly ciliated region on the ventral epidermis that helps them to creep over the substrate ...
In McConnell's experiments, he classically conditioned planarians to contract their bodies upon exposure to light by pairing it with an electric shock. [6] [5] The planarians retained this acquired information after being sliced and regenerated, even after multiple slicings to produce a planarian where none of the original trained planarian was ...
A hammerhead worm, also known as a broadhead planarian, demonstrates toxicity with bold coloration. The worm favors warm and damp habitats. - Bazzano Photography/Alamy Stock Photo
Planaria is a genus of planarians in the family Planariidae. Due to its excellent ability to regenerate, species of Planaria has also been used as model organisms in regeneration studies. [ 1 ] When an individual is cut into pieces, each piece has the ability to regenerate into a fully formed individual. [ 2 ]
The complete mitogenome of Caenoplana coerulea is 18,621 bp in length. [7] Its main characteristic is a cytochrome c oxidase subunit 2 gene of unusual length, with a cox2 encoded protein 505 aa in length (compared to about 250 aa in other geoplanids); this characteristic of a very long cox2 is also found in other members of the subfamily Rhynchodeminae, to which Caenoplana coerulea belongs.
James V. McConnell (October 26, 1925 – April 9, 1990) was an American biologist and animal psychologist.He is most known for his research on learning and memory transfer in planarians conducted in the 1950s and 1960s.
The W.R.D. published both satirical articles, such as "A Stress Analysis of a Strapless Evening Gown", and scientific papers, the most famous of which, "Memory transfer through cannibalism in planarians", was a result of McConnell's RNA memory transfer experiments with planarian worms and was later published in the Journal of Neuropsychiatry.