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Here we describe bacterial genotyping by direct linear analysis (DLA) single-molecule mapping. DLA involves preparation of restriction digest of genomic DNA labeled with a sequence-specific fluorescent probe and stained nonspecifically with intercalator. These restriction fragments are stretched one by one in a microfluidic device, and the distribution of probes on the fragments is determined by single-molecule...
Existing methods for extraction and processing of large fragments of bacterial genomic DNA are manual, time-consuming, and prone to variability in DNA quality and recovery. To solve these problems, we have designed and built an automated fluidic system with a mini-reactor. Balancing flows through and tangential to the ultrafiltration membrane in the reactor, cells and then released DNA can be immobilized...
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