1Tedder RS, Zuckerman MA, Goldstone AH, et al. Hepatitis B transmission from contaminated cryopreservation tank. Lancet , 1995,15 : 137-140.
2Meryman HT. Preservation of living cells. Fed Proc, 1963,22:81 - 89.
3Clarke G. Sperm cryopreservation : is there a significant risk of cross -contamination? Hum Reprod, 1999,14(12) :2941 - 2943.
4Kuleshova LL,Shaw JM. A strategy for rapid cooling of mouse embryos within a double straw to eliminate the risk of contamination during storage in liquid nitrogen. Hum Reprod, 2000,15(12) :2604 - 2609.
5Letur - Konirsch H, Collin G, Devaux A, et al. Conservation of human embryos in straws:safety in terms of human immunodeficiency virus 1.Gynecol Obstet fertile,2004,32 (4) :302 - 307.
6Maertens A, Bourlet T, Plotton N, et al. Validation of safety procedures for the cryopreservation of semen contaminated with hepatitis C virus in assisted reproductive technology. Hum Repred, 2004,19 ( 7 ) : 1554 -1557.
7Tomlinson MJ, Sakkas D. Safe and effective cryopreservation -should sperm banks and fertility centers move toward storage in nitrogen vapeur? Hum Reped, 2000,15 ( 12 ) :2460 - 2463.
8Fountain D,Ralston M,Higgins N, et al. Liquid nitrogen freezers: a potential source of microbialcontamination of hematopoietic stem cell components. Transfusion, 1997,37:585 - 591.
9Morris GJ. The origin, ultrastructure, and microbiology of the sediment accumulating in liquid nitrogen storage vessels. Cryobiology,2005,50(3) :231 -238.
10Amesse LS, Srivastava G, Uddin D,et al. Comparison of cryopreserved sperm in vaporous and liquid nitrogen. Reprod Meal,2003,48(5) :319 -324.
