The high - precision needle - slot candles are made of stainless steel , duplex , super duplex or titanium , have a filtration - range from 5000 micron to 25 micron 利用自身过滤出的清夜，自动反冲洗滤芯，不需拆下滤芯清洗，也不需另配清洗系统。
2.
Today , anyone who has not begun to have some genuine desire for unity ought to examine his conscience in the stillness of the night and feel some shame , even if no one else censures him 在今天，谁要是在团结两个字上不生长些诚意，他即使不被人唾骂，也当清夜扪心，有点儿羞愧。
3.
Fusion expression of m - centrin in e . coil bl21 was performed by induction of fptg . fusion protein was digested by ppase and was purified by gst chelating affinity chromatography and ion exchange chromatography . the final products were checked by sds - page gel 融合蛋白gst - m - centrin菌体经过超声波裂解后得到的上清夜经过gst亲和层析后用prescissionprotease ( ppase )酶切，酶切产物再次经过gst亲和层析和hitrapq阴离子交换层析两步柱层析纯化后，得到纯度较高的的m - centrin 。
