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    <mxCell id="problem" value="研究问题：确定柠檬酸生产的最佳搅拌与通气条件" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontSize=14;fontStyle=1;verticalAlign=middle;align=center;" vertex="1" parent="1">
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    <mxCell id="strategy" value="策略：5L罐反应器中改变搅拌（400–900 rpm）与通气（0.18–0.6 vvm）" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;fontSize=13;verticalAlign=middle;align=center;" vertex="1" parent="1">
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    <mxCell id="modification" value="关键改造：乙酸盐阴性突变体（Wratislavia 1.31与AWG7）利用甘油" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#fff2cc;strokeColor=#d6b656;fontSize=13;verticalAlign=middle;align=center;" vertex="1" parent="1">
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    <mxCell id="result1" value="结果一：最佳条件为搅拌800–900 rpm、通气0.24–0.48 vvm、DO≥40%" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;fontSize=13;verticalAlign=middle;align=center;" vertex="1" parent="1">
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    <mxCell id="result2" value="结果二：最高柠檬酸浓度92.8 g/L、产率0.63 g/g、体积产率1.15 g/L·h" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;fontSize=13;verticalAlign=middle;align=center;" vertex="1" parent="1">
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    <mxCell id="result3" value="结果三：低搅拌(400 rpm)致酵母-菌丝转变，异柠檬酸比例随DO升高而降低" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;fontSize=13;verticalAlign=middle;align=center;" vertex="1" parent="1">
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    <mxCell id="conclusion" value="结论：最佳条件为搅拌800–900 rpm、通气0.24–0.36 vvm、DO 50–80%，DO是决定因素" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#e1d5e7;strokeColor=#9673a6;fontSize=13;fontStyle=1;verticalAlign=middle;align=center;" vertex="1" parent="1">
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    <mxCell id="sideNote" value="附加说明：研究菌株为Wratislavia 1.31（高产）与AWG7，均为乙酸盐阴性突变体" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f5f5f5;strokeColor=#666666;fontSize=12;verticalAlign=middle;align=center;dashed=1;" vertex="1" parent="1">
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