Ultraviolet light is a type of electromagnetic radiation that makes black-light posters glow, and is responsible for summer tans — and sunburns. However, too much exposure to UV radiation is damaging to living tissue. Electromagnetic radiation comes from the sun and transmitted in waves or partic...
美 英 na.紫外线 网络紫外光区雷射 英汉 网络释义 na. 1. 紫外线 释义: 全部,紫外线,紫外光区雷射
and greeting Papa Roux 24 for $8.50 an hour.The publicity has brought in so many 25 customers that Bouvier plans to open a second restaurant by the end of the year.Reagan has 26 enough money to move into a new apartment.Now,when the weather is 27 ,he takes the bus to work.语篇解读...
The meaning of ULTRAVIOLET is situated beyond the visible spectrum at its violet end —used of radiation having a wavelength shorter than wavelengths of visible light and longer than those of X-rays. How to use ultraviolet in a sentence.
The positions of intramolecular crosslinks induced by irradiation with ultraviolet light were mapped into potato spindle tuber viroid RNA and HeLa 5S rRNA. Cross-linking in each of these molecules occurred at a single major site, which was located by RNA fingerprinting and secondary analysis (and ad...
Ultraviolet-A (UV-A) light penetrates the epidermis, reaches the macrophages and circulating mononuclear cells within the dermis, and has immunoregulatory effects in humans. We examined the effect of UV-A irradiation on disease activity in 26 patients with rheumatoid arthritis (RA) and on immunologi...
A flame is a mixture of reacting gases and solids emitting visible, infrared, and sometimes ultraviolet light, the frequency spectrum of which depends on the chemical composition of the burning material and intermediate reaction products. From: Principles of Colour and Appearance Measurement, 2014 ...
ait uses an ultraviolet light source to breakdown VOCs in the air into positive and negative ions. The PID then detects or measures the charge of the ionized gas, with the charge being a function of the concentration of VOCs in the air. 它使用一个紫外光来源到故障VOCs在天空中入正面和消极离...
We discovered that some porous silicon samples show a characteristic line spectrum in the near UV ,and violet spectral region. The violet part of the light can be clearly seen with the naked eye in the darkened laboratory at ambient pressure. This phenomenon has a completely different origin tha...
light regulation of the aggregation and dissociation of metal-bound Aβ peptides remains to be explored. The brains of Alzheimer’s disease (AD) patients are characterized by the deposition of amyloid plaques whose main component is Aβ peptides. Aβ42is more neurotoxic and has a higher ...