紫外辐射

Calcification began circa 600 million years ago, when UV levels were much higher than today.

她说："钙化大约开始于6亿年前，当时的紫外辐射比现在强得多。"

As to a lower concentration, though the transmission distance of ultraviolet is tinite, it is far enough to implement our application. Above all, it's safe, cryptical and anti-jamming.

相对较低的浓度值来说，虽然紫外辐射传输有限，但是具有足够远的距离，同时可达到安全、秘密和抗干扰的目的。

The chroma coordinates acquisition system consist of grating spectrometer and integrating sphere.

无紫外辐射和红外辐射；（8）宽的色域和快的响应速度。

As regards environmental protection, WMO's Global Atmospheric Watch monitors the chemical composition of the atmosphere including greenhouse gases, the ozone layer and ultra-violet radiation, as well as long-range transport of pollutants, aerosols, reactive gases and radioactive isotopes.

在环境保护方面，WMO的全球大气监视网对包括温室气体在内的大气化学成分，臭氧层和紫外辐射以及污染物、气溶胶、再活化气体和辐射同位素的长期距离传输进行监测。

C. discharge setup, vacuum ultraviolet spectral radiations in range of 120-200nm for the He H2 and N2 gases have been investigated. The relative radiation intensity as a function of the discharge current (100-600mA) and the influence of the gas pressure on it have been shown.

研究了He、H_2、N_2在120nm～20Onm范围内该装置的真空紫外辐射特性，获得了100～600mA电流范围内的辐射强度与放电电流的关系，以及充气气压变化对它的影响。

DATA SYNTHESIS: With the increase of ultraviolet radiation caused by environmental pollution, DNA in human epidermal cells is damaged. Cyclobutane pyrimidine dimmer and 6-4 photoproducts are the main forms of DNA lesions.

资料综合：环境污染使得紫外辐射增强，而紫外线辐射对机体表皮细胞的DNA具有损害作用，可导致环丁烷嘧啶二聚体和6-4光产物的形成。

Ozone College depletion in stratosphere has led to the increase of solar UV-B radiation reaching to the earth surface, which would damage DNA of plant epidermal cells and produce cyclobutane pyrimidine dimmers (CPD and 6-4 photoproducts.

臭氧衰减导致地表紫外辐射增强，而紫外线辐射对植物表皮细胞的DNA具有损害作用，可导致环丁烷嘧啶二聚体和6，4-光产物的形成。

What\'s more, different intervals of UV have their own characters in influencing DNA: the damage to some bases by UVA may be more serious than that by UVB, and UVB did more severe damage to some deoxyribose than UVA; however, as far as the pyrimidine bases are concerned, the damage by UVB is by far more serious than that by UVA. These results may indicate that there are preferential damaging sites on DNA molecules caused by UVA and UVB irradiation. Moreover, with UVA or UVB irradiation for a long time, the photoreactivation of DNA occurred. The serious damage to deoxyribose and bases by UVB and UVC may confirm the conformation of cyclobutane pyrimidine dimers and (6-4) photoproducts.

而不同波段紫外辐射对DNA的损伤各具特点并且差异明显，UVA对一些碱基的损伤比UVB要严重，而UVB在对脱氧核糖和磷酸盐的损伤上又比UVA要严厉，但就嘧啶碱基来说，UVB对它的损伤远大于UVA，这似乎表明了不同的紫外波段对生物大分子DNA的损伤是有选择性的。

Ultraviolet radiation emitted from the remaining hot core of the star ionizes the ejected gas shells, causing them to glow.

由遗留的炽热星核发出的强紫外辐射电离了喷出的气体外壳，激发它们发出辐射。

It can also occur if the radiation is in the wavelength range of ultraviolet radiation, X rays, or gamma rays.

如果辐射的波长范围是紫外辐射、X射线或γ射线，也可以发生光电效应。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。