BACKGROUND Whereas studies have revealed that the cryopreservation of human semen increases sperm DNA fragmentation, the mechanisms involved in this type of cryo-injury are largely unknown. Elucidation of these mechanisms may provide insight into preventing such injury. METHODS We obtained 60 semen samples from 60 men and conducted experiments to determine the cause of cryopreservation-induce...

Cryopreservation of oocytes and embryos is commonly used to preserve fertility. However, women undergoing cancer treatment may not have the time or may not be good candidates for these options. Ovarian cortical tissue cryopreservation and subsequent tissue transplant has been proven successful yet inefficient in preserving larger secondary follicles, and is not recommended as a fertility preser...

Cryopreservation is a process that preserves organelles, cells, tissues, or any other biological constructs by cooling the samples to very low temperatures. The responses of living cells to ice formation are of theoretical interest and practical relevance. Stem cells and other viable tissues, which have great potential for use in basic research as well as for many medical applications, cannot b...

Cryopreservation of cultured skin substitutes is a requirement for establishment of banks of alternative materials for treatment of acute and chronic skin wounds. To determine whether cryopreservation of skin substitutes that contain cultured cells reduces their efficacy for wound closure, cell-biopolymer grafts were frozen, recovered into culture, and grafted to wounds on athymic mice. Grafts ...

Spermatogonial stem cells (SSCs) are germline stem cells that serve as the foundation of spermatogenesis to maintain fertility throughout a male's lifetime. To treat male infertility using stem cell banking systems and transplantation, it is important to be able to preserve SSCs for long periods of time. Therefore, this study was conducted to develop an optimal cryopreservation protocol for SSC...

Cryopreservation of spermatozoa plays a significant role in reproductive medicine and fertility preservation. Chicken egg yolk is used as an extender in cryopreservation of human spermatozoa using glycerol egg yolk citrate (GEYC) buffered medium. Even though 50% survival of spermatozoa is generally achieved with this method, the risk of high levels of endotoxins and transmission pathogens from ...

BACKGROUND The cause of valve allograft failure is most likely multifactorial and may include mechanical, immunological, and other factors. Cryopreservation of these valves is often used to extend storage times. However, there has been considerable confusion as to the effects of cryopreservation on valve durability. Our objective was to determine the effects of cryopreservation on histopatholog...

In March 2012, an article in The Straits Times entitled 'Freezing eggs could reverse falling birth rate' suggested that employing the latest oocyte cryopreservation techniques could both foster individual women's reproductive autonomy and impact Singapore's fertility rate, which in recent years has consistently been among the world's lowest. The article cited both local and international fertil...

Semen cryopreservation is an important procedure in the treatment of human infertility. However, the ability of spermatozoa to survive freeze/thaw processes varies between patients. Cryopreservation-induced stress may result in membrane injury with consequent loss of sperm motility and viability. We investigated the relationship between the physico-chemical state of the human sperm membranes an...

Cryopreservation has been proven significance as a technique for promising the long-term conservation of plant germplasms. This study aimed to establish a cryopreservation protocol for calli of Schisandra chinensis (Turcz.) Baill, and to explore the effects of different process parameters on callus viability. Effects of desiccation duration, cryoprotectants and cryopreservation methods, thawing...