Sentences with word «pheomelanin»

Eumelanin makes us develop a suntan and gives colour to brown and black hair, whereas those with red hair and pale skin instead have high levels of pheomelanin.

The study, published in the British Ecological Society's journal Functional Ecology, is the first evidence that wild animals adapt to ionizing radiation, and the first to show that birds which produce most pheomelanin, a pigment in feathers, have greatest problems coping with radiation exposure.

Because pheomelanin production requires lots of antioxidants, the researchers suspect these birds may not have enough left over to fight off the free radicals.

Eumelanin is considered to be the pigment that protects against UV radiation while pheomelanin is believed to cause skin cancer in some way, which explains why people with red hair are more likely to develop malignant melanoma.

The only two bird species negatively affected by the radiation — the great tit (Parus major) and barn swallow (Hirundo rustica)-- both produce large amounts of pinkish pheomelanin pigment in their feathers.

They also showed that birds which produce larger amounts of pheomelanin and lower amounts of eumelanin pay a cost in terms of poorer body condition, decreased glutathione and increased oxidative stress and DNA damage.

Pigment in both skin and hair comprises two different types of melanin: eumelanin and pheomelanin.

Melanins are the most common animal pigments but because the production of pheomelanin (one type of melanin, the other type being eumelanin) uses up antioxidants, animals that produce the most pheomelanins are more susceptible to the effects of ionizing radiation.

This series only acts on «yellow» pigments (pheomelanin), turning them to gray.

These pigments, which are both forms of melanin, are Pheomelanin (red) and Eumelanin (black).