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A frozen zoo is a storage facility in which genetic materials taken from animals (e.g. DNA, sperm, eggs, embryos and live tissue) are gathered and thereafter stored at very low temperatures in tanks of liquid nitrogen waiting to be reprogrammed into stem cells for optimal preservation over a long period (see cryopreservation). Some facilities also collect and cryopreserve plant material (usually seeds). thumbnail Zoos such as the San Diego Zoo and research programs such as the Audubon Center for Research of Endangered Species〔(【引用サイトリンク】title=Species Survival Center )〕〔(【引用サイトリンク】title=Frozen Zoo )〕 cryopreserve genetic material in order to protect the diversity of the gene pool of endangered species, or to provide for a prospective reintroduction of such extinct species as the Tasmanian tiger and the mammoth. Frozen Zoo at San Diego Zoo Conservation Research has been freezing biological materials from animals and plants in liquid nitrogen (−196 °C) since 1976. They currently store a collection of 8,400 samples from over 800 species and subspecies.〔(【引用サイトリンク】title=Chill Out: Frozen Zoo Aiding Conservation Projects )〕 Frozen Zoo at San Diego Zoo Conservation Research has acted as a forbearer to similar projects at other zoos in the United States and Europe including the Frozen Ark Project.〔(【引用サイトリンク】title=Scientific Meeting - The Frozen Ark Project )〕〔(【引用サイトリンク】title=Welcome to the Frozen Ark )〕 However, there are still less than a dozen frozen zoos worldwide.〔 At the United Arab Emirates Breeding Centre for Endangered Arabian Wildlife (BCEAW), Sharjah, the embryos stored include the extremely endangered Gordon’s wildcat (''Felis silvestris gordoni'') and the Arabian leopard (''Panthera pardus nimr'') (of which there are only 50 in the wild). At University of Georgia's Bio science center has recently in October 2015 has built a frozen zoo. Scientists goals are to save endangered big cat species from going extinct using this new cloning method. Scientists have take cells from big cats and frozen them in liquid nitrogen and will one day convert them into stem cells, which will be turned into sperm and egg cells. Scientists are very optimistic that the process will be successful with big cats since the process has already been successful with pigs and mice. Scientists also hope to eventually one day save all endangered species from extinction. CNN News- http://www.cnn.com/2015/10/01/us/frozen-zoo-endangered-species-georgia-/index.html ==Creating a frozen zoo== the University of Georgia's Regenerative Bioscience Center is building the frozen zoo. Gathering material for a frozen zoo is rendered simple by the abundance of sperm in males. The scientists have already extracted cells from a Sumatran tiger named Jalal. Sperm can be taken from an animal following death. The production of eggs, which in females is usually low, can be increased through hormone treatment to obtain 10–20 oocytes, dependant on species. Some frozen zoos prefer to fertilize eggs and freeze the resulting embryo, as embryos are more resilient under the cryopreservation process.〔 The zoo also collects skin cell samples of endangered animals or extinct species. Scripps Research Center has successfully made them in to a cultures of special cells,induced pluripotent stem (IPS) cells. Now, theoretically, they are able to make sperm and egg cells with old skin cells. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Frozen zoo」の詳細全文を読む スポンサード リンク
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