yolk gland - définition. Qu'est-ce que yolk gland
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Qu'est-ce (qui) est yolk gland - définition

SPECIES OF CNIDARIAN
Egg-yolk jellyfish; Egg Yolk jellyfish; Egg-yolk Jellyfish; Phacellophora camschatica; Egg yolk jellyfish; Egg yolk jelly; Phacellophora; Phacellophoridae
  • ''Cotylorhiza tuberculata''. A different jellyfish species also commonly known as the fried egg jellyfish.

Yolk         
  • Diagram of a [[fish egg]]; the yolk is the area marked 'C'
  • A chicken egg frying with an extremely thick red yolk. A normal-coloured yolk can also be seen, having been accidentally burst during the frying process.
PART OF AN EGG WHICH FEEDS THE DEVELOPING CHICKEN EMBRYO
Egg yolks; Double-yolked egg; Double-yolker; Double yolker; Double egg yolk; Double yolked egg; Egg-yolk; Yolks; Double yolk; Vitellus; Double yolk egg; Double-yolk egg; Double yolked eggs; Double-yolked eggs; Double yolk eggs; Double-yolk eggs; Double-yolkers; Double-yolk; Double yolks; Double-yolks; Double yolked; Double-yolked; Yellow of the egg; Egg yolk; Egg yellow; Egg yoke
Among animals which produce eggs, the yolk (; also known as the vitellus) is the nutrient-bearing portion of the egg whose primary function is to supply food for the development of the embryo. Some types of egg contain no yolk, for example because they are laid in situations where the food supply is sufficient (such as in the body of the host of a parasitoid) or because the embryo develops in the parent's body, which supplies the food, usually through a placenta.
yolk         
  • Diagram of a [[fish egg]]; the yolk is the area marked 'C'
  • A chicken egg frying with an extremely thick red yolk. A normal-coloured yolk can also be seen, having been accidentally burst during the frying process.
PART OF AN EGG WHICH FEEDS THE DEVELOPING CHICKEN EMBRYO
Egg yolks; Double-yolked egg; Double-yolker; Double yolker; Double egg yolk; Double yolked egg; Egg-yolk; Yolks; Double yolk; Vitellus; Double yolk egg; Double-yolk egg; Double yolked eggs; Double-yolked eggs; Double yolk eggs; Double-yolk eggs; Double-yolkers; Double-yolk; Double yolks; Double-yolks; Double yolked; Double-yolked; Yellow of the egg; Egg yolk; Egg yellow; Egg yoke
(yolks)
The yolk of an egg is the yellow part in the middle.
Only the yolk contains cholesterol.
...buttered toast dipped in egg yolk.
N-VAR
Yolk         
  • Diagram of a [[fish egg]]; the yolk is the area marked 'C'
  • A chicken egg frying with an extremely thick red yolk. A normal-coloured yolk can also be seen, having been accidentally burst during the frying process.
PART OF AN EGG WHICH FEEDS THE DEVELOPING CHICKEN EMBRYO
Egg yolks; Double-yolked egg; Double-yolker; Double yolker; Double egg yolk; Double yolked egg; Egg-yolk; Yolks; Double yolk; Vitellus; Double yolk egg; Double-yolk egg; Double yolked eggs; Double-yolked eggs; Double yolk eggs; Double-yolk eggs; Double-yolkers; Double-yolk; Double yolks; Double-yolks; Double yolked; Double-yolked; Yellow of the egg; Egg yolk; Egg yellow; Egg yoke
·noun The yellow part of an egg; the vitellus.
II. Yolk ·noun An oily secretion which naturally covers the wool of sheep.

Wikipédia

Phacellophora camtschatica

Phacellophora camtschatica, commonly known as the fried egg jellyfish or egg-yolk jellyfish, is a very large jellyfish in the family Phacellophoridae. This species can be easily identified by the yellow coloration in the center of its body which closely resembles an egg yolk, hence how it got its common name. Some individuals can have a bell close to 60 cm (2 ft) in diameter, and most individuals have 16 clusters of up to a few dozen tentacles, each up to 6 m (20 ft) long. A smaller jellyfish, Cotylorhiza tuberculata, typically found in warmer water, particularly in the Mediterranean Sea, is also popularly called a fried egg jellyfish. Also, P. camtschatica is sometimes confused with the Lion's mane jellyfish (Cyanea capillata).

It feeds primarily by collecting medusae and plankton with its tentacles, and bringing them into its mouth for digestion. It is capable of only limited motion, and mostly drifts with the current, even when swimming. This species and most of its relatives in the Cnidaria phylum often use suspension feeding as their main food gathering strategy.

The body of this jellyfish does not contain any respiratory, circulatory, or excretory systems. Instead, it uses its large surface area to accomplish these things. Also, this species (and all others in the phylum cnidaria) lack a mesoderm and instead uses mesolgea. Therefore, there are not three true tissue layers, in turn making this species (and all other cnidarians) diploblastic not triploblastic.

The reproduction and life cycle of this jellyfish has been well documented. It mostly follows the same life cycle as other members in the class Scyphozoa. It alternates between a polyp form that reproduces asexually and a medusa form that reproduces sexually. These jellyfish are a cool water species found in most of the world’s oceans, but most commonly in the Northern Pacific.