Because they are antibiotics, low bioburden of these formulations would be expected at the time of batching. 因为它们是抗生素，所以在定量的时候处方里有较低的微生物污染水平。
Why would the laser tweezers be a suoerior method to dilution and liquid enrichment for obtaining an organism present in a sanple in low numbers? 在显微镜下，激光产生力拖动需要的微生物，转移至灭菌的培养基上，而经典的方法没能培养很多微生物。
