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5-Aminolevulinic acid (ALA) is a nonprotein amino acid that has been widely used in many fields. In this study, we developed a new process for ALA production by optimizing the in vivo heme biosynthesis pathway and the iron concentration during cultivation. With the addition of iron, co-overexpression of the heme synthesis pathway genes hemA, hemL, hemF, and hemD significantly increased the accumulation...
Ultra-fine Ba0.5Sr0.5Fe12O19 nanopowders have been successfully synthesized by chemical co-precipitation method. The thermal properties of the samples were measured using DTA/TG. The phase of the powder was observed by X-ray diffraction (XRD), and the microstructure of the sample was observed by scanning electron microscope (SEM). The effects of pH value, Fe/Ba molar ratio, holding time, and calcination...
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