The ratio of absorbance at 260 nm and 280 nm is used to assess the purity of DNA and RNA. A ratio of ~1.8 is generally accepted as “pure” for DNA; a ratio of ~2.0 is generally accepted as “pure” for RNA. If the ratio is appreciably lower in either case, it may indi-...
1、A230、A260和A280 记不清是在物理课还是化学课上(理化不分家)学到的大名鼎鼎的“朗伯-比尔定律(Beer-Lambert law)”公式中,提出了吸光度值(absorbance,简写A)的概念,为了便于回忆,呈上公式:A=lg(1/T)=Kbc。 该公式是对下面客观事实的总结:某一化学物质可吸收一定波长的光,并且对光的吸收度(A)与此化学...
color, Botrytis cinerea, decay resistance, phenolic compounds, raspberries, juices, weather, pH, interspecific variation, fruit quality, oxygen radical absorbance capacity, anthocyanins, environmental factors, ethylene production, Rubus occidentalis, hybrids, postharvest diseases, titratable acidity, genotype,...