kellastumiselle

Kellastuminen is a Finnish term that refers to the process of yellowing or becoming yellow. It is most commonly used in the context of biological materials, such as leaves on plants or skin on humans.

In the case of plant leaves, kellastuminen is often a sign of aging or senescence. As leaves age, chlorophyll, the green pigment responsible for photosynthesis, breaks down. This allows other pigments, such as carotenoids, which are yellow or orange, to become visible. Environmental factors like insufficient sunlight, lack of nutrients, or disease can also contribute to leaf yellowing.

In humans, kellastuminen can refer to the yellowing of the skin, known as jaundice. Jaundice is caused by an excess of bilirubin, a yellow pigment produced during the breakdown of red blood cells, in the blood. This can be a symptom of various underlying medical conditions affecting the liver, gallbladder, or blood.

The term kellastuminen can also be applied more broadly to any object or material that undergoes a change in color to yellow. This might include the aging of certain plastics, the fading of fabrics, or the discoloration of paper over time. The specific cause of kellastuminen in these instances depends on the material's composition and its exposure to factors like light, heat, or chemicals.