The invention relates to improved E. coli bacteria with enhanced viability at low temperatures, methods for producing improved bacterial strains capable of enhanced viability at low temperatures, and the isolation and use of genetic material capable of enhancing the viability of bacteria at low temperatures....http://www.google.es/patents/US6855494?utm_source=gb-gplus-sharePatente US6855494 - Method for increasing viability and transformation efficiency of bacteria during storage at low temperatures
Method for increasing viability and transformation efficiency of bacteria ...
