水下樹桿 的英文怎麼說
中文拼音 [shuǐxiàshùgǎn]
水下樹桿
英文
submerged stumps-
Any organic matter can be used such as sugar cane mulch ( looks like straw ) ; hays like lucerne, oats or barley ; finely ground bark ; lawn clippings and leaves ( always mixed so they break down and don ' t actually repel water ) ; sawdust ; manures - even old clothing or newspaper can be recycled to conserve moisture
覆蓋物可選用任何有機物質，比如甘蔗桿（看起來很像麥桿） 、乾草（如紫花苜蓿） 、燕麥桿、大麥桿、碎樹皮、剪草機剪下的草、樹葉（將它們混合起來以免排斥水分） 、鋸末、肥料，甚至舊衣服、報紙等等，都可用來保持濕度。After the acet is vaporized, the active substance in water is gotten. and which is vaporized at low temperature. then the crude active substance is purified by column chromatography on sephadex g - 75. after a series of purifications again, we could get some white powder at last. though the active substance is diluted to50 g / ml, the activity is still checkeded - up through phyto phtnora casicileon. the purified active substance is insensitive to heat, resistant to chloroform 、 ethanol and the orhers. in addition, the active substance is sensitive to high ph ( 10 ~ 14 ), but it is not sensitive to low ph ( 1 ~ 5 ). furthermre, when the ph is made to low again, the activity of it ' s comes back
用蒸餾水對菌體稀釋；加入適量吸附樹脂在150rpm 、 28下振蕩吸附4h ， 80 %的丙酮解吸，過濾解吸液得到活性物質的澄清溶液，旋轉蒸發儀旋轉蒸發去處丙酮，經sephadexg - 75分子篩層析得單一活性峰，收集峰值部分樣品液經冷凍乾燥得到淡褐色粉末，該活性物質用丙酮充分洗滌、甲醇-乙醚重結晶獲得略帶微黃的白色粉末，該活性物質50 g / ml仍可對蘇雲金芽孢桿菌hd - 1產生明顯的抑制作用。
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