UVC对机体细胞有强烈的刺激破坏作用, 但由于几乎完全被臭氧层吸收而不能到达地面。 我们一般讨论的就是UVA和UVB,它们都参与皮肤的光老化和光致癌过程,所以优先选能充分防护UVB、UVA2和UVA1的广谱防晒霜,既防晒黑,也防晒伤。 防晒霜,选这些成分 根据其中滤光剂的成分,防晒霜分为有机型(旧称化学防晒霜)和无机型(...
其中,UVA (320～400nm) 具有很强的穿透力,有大约98%的UVA能穿透云层和臭氧层到达地球表面;相较之下,UVB(280～320nm) 的穿透力则较弱,它会被臭氧层吸收掉大部分,只有约2%能到达地球表面。UVC(100～280nm) 的穿透能力最弱,几乎被臭氧层完全吸收。因此,对人们能造成直接影响的主要是UVA 和 UVB。在相同剂量下...
Wellness for women: Sunscreen must protect against UVA and UVB raysDr Lee Kleiman
Function:UV Protection;Product Name:Skin Care Sunscreen Cream;SPF:50 + PA+++ / Customized;Service:OEM ODM Private Label;Effect:SPF 50 Sunblock;Usage:Daily Skin Care;Certification:ISO22716;Main Function:Moisturizing Anti-aging Brightening;Sample:Avaliab
UVA 美[ˌju vi ˈeɪ] 英[ˌjuː viː ˈeɪ] n.长波紫外线;紫外线 A 波段 abbr.老化 网络弗吉尼亚大学;长波紫外光;紫外线长波 权威英汉双解 英汉 英英 网络释义 UVA 显示所有例句 n. 1. 长波紫外线;紫外线 A 波段ultraviolet rays that are relatively long...
下图几乎囊括了市面上所有防晒剂的性能 (来源:Osterwalder U & Herzog B,The long way towards the ideal sunscreen – where we stand and what still needs to be done,Photochem Photobiol Sci2010,9, 470-81.) 市面上常见防晒剂的吸收曲线。横坐标为波长 (UVB: 290-320, UVA II: 320-340, UVA I:...
Find out the differences between UVA rays and UVB rays, discover the risks and health benefits, and learn how to protect yourself.
skin against harmfulUVA and UVB rays. clarinsusa.com clarinsusa.com 特为敏感肌肤设计,这款轻盈的乳霜有助于预防刺激和红肿,保护肌肤免受有害中长波紫外线照射。 clarinsusa.com clarinsusa.com [...] it gives total sunscreen protection against harmfulUVA and UVB rays,aswell as anti-oxidant ...
Both Dr. Wang and Dr. Gohara emphasized that, no matter what the SPF is, it’s important to reapply your sunscreen every two hours.【小题】(1) What rays can cause skin cancer according to the text?A.UVAB.UVC.UVA&UVBD.UVB【小题】(2) What can we know about SPF...
The paper was about how to get polyphenols content from apples,and then studied on the sunscreen property of the apple polyphenols,and took apple polyphenols as sun-screening agent. 提取了苹果中的多酚成份,并对其防晒性能进行了研究,并和纳米二氧化钛、纳米氧化锌、新型防晒剂NT-200A、新型防晒剂NT-...