3M1860N95医用防护口罩

无显著差异！JAMA 揭示 N95 与医用外科口罩在预防流感发病率方面没有显著差异

地预防新型冠状病毒的呼吸道传播，起到很好的自我保护作用。N95 口罩是指经过美国 NIOSH（美国国家职业安全卫生研究所）机构认证的非油性颗粒物防护效率不小于 95% 的口罩。常用的 N95 口罩实际上分为两种：一种是防生物口罩（蓝绿色），型号 1860 或 9132；一种是防尘口罩（白色），型号 8210。市民在购买时应选择防生物的医用防护口罩，95 口罩可以阻挡 95% 的病原菌。KN95 口罩指符合中国国家标准的非油性颗粒物防护效率不小于 95% 的口罩。其中「N」或「KN」表示用于防护非

Phenol/Freeze RNA Prep

:1 of phenol:chloroform:isoamyl alcohol SEVAG 24:1 chloroform:isoamyl alcohol 3M NaOAc pH 5.2 (DEPC treat) RNase-free 95% EtOH (-20 deg C) RNase-free 70% EtOH 1. Grow cells to no later than late log phase (1E7 cells) in 20 ml of media (protocol

Green lab protocol for vacuum infiltration transformation of Arabidopsis

have not been done. However, this protocol gives us very good results, with at least 95% of all infiltrated plants giving rise to transformants, and a transformant rate of 1-4% of seed. 1. Sow seeds of ecotype Columbia in lightweight plastic pots prepared in the following way: mound