@article {1041,
	title = {The origin, ultrastructure and microbiology of the sediment accumulating in Dewars used for the storage of cryopreserved samples},
	journal = {Fertility and Sterility},
	volume = {82 Supl.2},
	year = {2004},
	pages = {S114},
	abstract = {CONCLUSION: Ice crystals present in liquid nitrogen storage vessels concentrate biological contamination and provides a mechanism by which cryopreserved samples may become contaminated during storage. The association of the microbial contamination with ice may also provide ways to minimise the problem. A related issue is that storage vessels which have been maintained for several years would be expected to contain a high level of contamination which may be a risk to operators. This aspect has generally been overlooked and should be included in the development of safety policy for IVF laboratories.},
	author = {Morris,G. J.}
}
