The 28 pyrrolizidine alkaloid (PA) standards used in the present study were purchased from Phytolab (Vestenbergsgreuth, Germany), their abbreviations are shown in Table 1. Methanol (HPLC grade), ammonia solution (25%), and water (LC–MS grade) manufactured from Merck KGaA (Darmstadt, Germany...
inTable 1. The errors between the measured and predicted masses were within less than 6 ppm, which demonstrated the high mass accuracy of the instrument. The chromatograms of MEQ and metabolites are shown inFigure 2, and the fragmentation ions and potential neutral losses are shown inFigure 3...
根据文中“I am in Class Four GradeSeven”可知,Ann在七年级四班。故选项B符合题意。2.C 词义猜测题。根据文中“John is in the same class withme and he sits behind me"可知,John与 Ann在同一个班级并且John坐在 Ann的后面。故选C。3.A 细节理解题。根据文中“His favourite ...
题目英语选词填空comfortable ,enter ,fear ,handle ,however ,manageresponsible,share ,shortly,smart succeed ,surround1.George is a very___boy2.you have to work hard if you want to___in your courses.3.___after you left,a girl came into our office looking for y...
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Eight years ago,I discovered that I was pregnant with my first child.The due date was March 15.I told the doctor that was just too soon.The baby’s due date had to fall between March 29 and April 3 because that was when my mother had her spring break from teachin...