值 Ⅰ名词1.(价值; 数值) price; value 币值 currency value; 比值 specific value; ratio; 总产值 gross output value2.[数学] value 绝对值 absolute value; 切割值 cut valueⅡ动词1.(货物和价钱相当) be worth 不值一提 not worth mentioning; 这车不值五万美元。 this car is not worth 50,000 dollars. 这值多少钱? how much [what] is this worth? 跑这一趟不值。 the trip is not worthwhile.2.(碰上; 遇到) happen to; come upon 值此危急之秋 at such a critical time; 值此贵国五十周年国庆之际 on the occasion of the 50th anniversary of your national day; 我们到时适值雨季。we happened to arrive there in the rainy season.3.(担任轮到的职务) be on duty; take one's turn at sth.: 轮值 work in shifts; take turns; 值夜 be on night duty; be on the night shift; 值周 be on duty for the week
The activity of crude enzyme prepared from the jasmine flower enlarged at 23 : 00 and lowed at the late stage . 3 - glucosidase activity rose slightly at 2 0 : 00 . this suggested that p - glucosidase participated in the aroma releasing 酯酶同工酶中rf值为0 . 325的酶可能与开放释香成负相关性,而rf值为0 . 83的酶可能参与了茉莉花的开放释香。
5 . detection : the samples were extracted with ethyl ether . the lidocaine in the sample was qualitated by rf and a tlc scanning spectrometry , quantitated by a tlc scanning chromatography and a two points external standard method or a standard curve method 5 、利多卡因检测方法:样品碱化处理后,乙醚提取,薄层扫描检测,根据利多卡因的rf值结合光谱扫描图定性,外标两点法或标准曲线法定量。