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That's how long it took Nayernia's team to nurture sperm from embryonic stem cells, using a special cocktail of growth factors, nutrients and retinoic acid, a derivative of vitamin A. It is worth noting that researchers could generate IVD sperm only from male embryos; when they tried using stem cells from a female embryo, they were unable to get sperm to mature past the spermatogonial stage. That suggests that genes located on the Y chromosome, which female cells do not contain, may be essential for triggering the maturation of the primitive sperm cell...
...homeowners who stop paying their mortgage may be doing so intentionally, not because they can't make the payments but because they don't want to put money into a house that's worth less than what they owe. That finding, from a paper by economists at the University of Chicago, Northwestern University and the European University Institute, raises some doubt about the approach the Obama Administration has taken toward stabilizing the housing market. The current approach focuses on whether or not homeowners can afford their monthly payments, and largely ignores the fact that some 20% of homeowners owe more...
...utility costs, but that will likely require an up-front payment - in the form of investment in more energy-efficient utilities - and those remain a hard sell to American consumers. Even if you succeed in reducing your personal carbon emissions drastically, you'll likely produce only a few tons' worth of carbon credits - and with carbon credits worth around $7 a ton on the voluntary market, you won't exactly be able to retire on the payoff. Plus, the website is still evolving, and the company still needs to find corporate buyers who will take on the credits - which right...
...market]," said Viktor Khristenko, head of the Industry and Trade Ministry, in March. As orders have started to dry up, the production of handicrafts by registered companies in the period between January and May fell 19% compared with the same period last year, dropping from $35.2 million worth of goods to $28.5 million, according to the Federal State Statistics Service. Meanwhile, the number of tourists, who make up the bulk of buyers of Russian handicrafts, has dipped drastically, with 25% fewer visitors arriving in the first quarter of 2009 than in the same period in 2008. (See pictures...
...crisis has become harder and harder to ignore, even as Krytikova is surrounded by more than 30 dolls that, when completed, will represent about $190 worth of merchandise for three days of work. "In 1999, we were able to buy a car, a garage, send one son to university and renovate our apartment on the money my husband and I made from making matryoshki," she says. "But today, you make such a small amount of money for such devilishly complicated work." She notes that since October, she's had to cut her prices by about $4 per doll. Factor...