Plants and animals often use color to attract attention. The substances responsible for these colors belong to a class of chemicals called antioxidants(抗氧化剂). Plants make antioxidants to protect themselves from the sun's ultraviolet (UV) light(紫外线). Ultraviolet light causes chemicals called...
Plumage coloration can result from pigments deposited in feathers such as carotenoids and melanins, or can be caused by nano-scale reflective tissues (structurally based coloration), usually producing ultraviolet (UV) coloration. Structural colorations remain the least studied of the three most ...
1. C 细节理解题.根据第二段"Plant and animals often use color to attract attention. The substances responsible for these colors belong to a class of chemical called antioxidants(抗氧化物). Plants make antioxidant to protect themselves from the sun's ultraviolet(UV)(紫外线)light植物和动物经常用...
This printing technique involves using ultraviolet (UV) light to help “cure” the coating that is applied to protect the packaging (gloss or varnish). Not only does this help seal in the vividness of the color, but it also adds an additional layer of protection to the finished product. UV...
But fur — a trait shared by most terrestrial mammals — is never naturally bright blue (at least, not in visible light. Researchers recently found that platypus fur glows in vivid shades of blue and green when exposed to ultraviolet (UV) rays, Live Science previously reported). The highly...
Exposure to ultraviolet light, such as from the sun or tanning beds, may also increase the odds of uveal melanoma. But, it’s not yet clear if this is the case. What Are the Main Symptoms of Metastatic Uveal Melanoma? You may be concerned you or a loved one has uveal melanoma. Early...
第1课 A: Do you have a date for the party yet? B: Actually, I don’t. Do you think you could help me find one? A: Hmm, what kind of guys do you like? B: Oh, I like guys who aren’t too serious and who have a good sense of humor. You know, like you. A: Ok, what...
Selective laser sintering (SLS) printers use lasers to sinter powdered material, typically nylon or other thermoplastics, layer by layer to create strong and complex objects directly from a digital model. Polyjet printers spray photopolymer resin and cure it with ultraviolet light for higher detail,...
sun.A bee's eye also gauges(测量)flight speed.And if that is not enough to leave our 20/20 "perfect vision" paling into insignificance,the bee is capable of seeing something we can't-ultraviolet light.Thus,what humans consider to be "perfect vision" is in fact rather limited when we ...
each Iso-Y line’s centroid, constructed from the Red Green Blue (RGB; top) and ultraviolet (UV; bottom) colour measurements at each sampling location. UV images are false colour, with lighter grey indicating higher UV reflectance. Source data underlying Fig.1aare provided as a Source data ...