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Little is known about the biology of most wentletraps. Keen (1958) has his literature most cited. He observed that many wentletraps reveal a hint of purple body color, suggestive of carnivorous feeding. The animal can exude through its salivary gland a pink or purplish dye that may have an anaesthetic effect on its prey. [5] [6]
Similar to porphyry, purple fabric was extremely difficult to make, as purple required the use of snails to make the dye. [16] The colour itself would have caused the public to remember how they were to behave in the presence of the real emperors wearing the real fabric, with respect bordering on worship for their self-proclaimed god-kings.
Two distinct behaviors have been observed in inking cephalopods. The first is the release of large amounts of ink into the water by the cephalopod in order to create a dark, diffuse cloud (much like a smoke screen) that can obscure the predator's view, allowing the cephalopod to make a rapid retreat by jetting away.
The dog-whelk can be used to produce red-purple and violet dyes, [6] like its Mediterranean relations the spiny dye-murex Bolinus brandaris, the banded dye-murex Hexaplex trunculus and the rock-shell Stramonita haemastoma which provided the red-purple and violet colours that the Ancient World valued so highly. [7]
The snail's shell is reverse countershaded, because of its upside-down position in the water column. There is a light purple shade on the spire of the shell, and a darker purple on the ventral side. [9] The animal has a large head on a very flexible neck. The eyes are small and are situated at the base of its tentacles.
Bolinus is a genus of sea snails, marine gastropod mollusks in the family Muricidae, the murex snails or rock snails. [2] This genus is known in the fossil record from the Miocene to the Pliocene period (age range: from 15.97 to 2.588 million years ago.). Fossil shells within this genus have been found in Cyprus, Austria, Italy and Turkey. [3]
A “vital dye” or stain is a dye capable of penetrating living cells or tissues without causing immediate visible degenerative changes. [26] Such dyes are useful in medical and pathological fields in order to selectively color certain structures (such as cells) in order to distinguish them from surrounding tissue and thus make them more ...
The name, "Lydia", meaning "the Lydian woman", by which she was known indicates that she was from Lydia in Asia Minor. Though she is commonly known as "St. Lydia" or even more simply "The Woman of Purple," Lydia is given other titles: "of Thyatira," "Purpuraria," and "of Philippi ('Philippisia' in Greek)."