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The operon encoding aspartokinase and aspartate semialdehyde dehydrogenase was cloned and sequenced from rifamycin-SV-producing Amycolatopsis mediterranei U32 previously. In the present work, these two genes were introduced into the auxotrophic Escherichia coli strain CGSC5074 (ask −) and E. coli X6118 (asd −), respectively. The A. mediterranei U32(More)
Digital radio frequency (RF) matching box used in the manufacturing process of semiconductor is a critical equipment for discharging plasma. In this process, the impedance of the plasma chamber is always changed. Inconsistent impedance between matching box and plasma chamber leads to uneven thickness of plasma coating on semiconductor. In order to maintain(More)
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