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The yolk of a chicken egg Diagram of a fish egg; the yolk is the area which is marked 'C'. Among animals which produce eggs, the yolk (/ ˈ j oʊ k /; 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.
The yolk is concentrated in one part of the egg (the vegetal pole), with the cell nucleus and most of the cytoplasm in the other (the animal pole). The cell cleavage is uneven, and mainly concentrated in the cytoplasma-rich animal pole. [3] The larger yolk content of the mesolecithal eggs allows for a longer fetal development.
The embryo forms a disc of cells, called a blasto-disc, on top of the yolk. Discoidal cleavage is commonly found in monotremes, birds, reptiles, and fish that have telolecithal egg cells (egg cells with the yolk concentrated at one end). The layer of cells that have incompletely divided and are in contact with the yolk are called the "syncytial ...
Photos show the multicolored Laojunshan slow frog. The frog’s back is chestnut brown with dark brown-black splotches. Underneath, its belly is creamy white with “yolk-yellow” groin and ...
The largest seamless photograph made in a single exposure was made using a Southern California jet hangar transformed into a giant camera. The most recent claim to the largest image stitched together was by the Canadian Museum of Civilization.
Research indicates that century eggs are an excellent source of Vitamin B12, which is crucial for metabolism and DNA synthesis. The yolk of century eggs typically contains about 1.9 ± 0.6 to 0.8 ± 0.3 μg of vitamin B12, which is notably higher than the 0.9 μg per 100 grams found in traditional chicken eggs, concentrated primarily in the yolk.
In the eggs of most birds (not of the reptiles [1]), the chalazae are two spiral bands of tissue that suspend the yolk in the center of the white (the albumen). The function of the chalazae is to hold the yolk in place. In baking, the chalazae are sometimes removed in order to ensure a uniform texture.
China is a country of striking contrasts where ancient traditions meet new technology and serene rural landscapes coexist with nearby bustling megacities. So we put together a collection of photos ...