Stem Cell Study Scrambles Egg Debate, Again - ScienceNOW...
"For more than 50 years, the seemingly ironclad biological rule was that women and other female mammals produce a finite number of egg cells during their embryonic development, then shut down egg production for good. Recently, however, a series of papers from reproductive biologist Jonathan Tilly of Massachusetts General Hospital in Boston and biologist Ji Wu of Shanghai Jiao Tong University in China have sparked hopes that it might be possible to enhance fertility by stimulating new egg production in adult women or by producing eggs in the lab from stem cells. Their reported discovery of a population of rare ovarian stem cells in adult women and mice that appear to produce immature egg cells, or oocytes, has incited controversy among reproductive biologists, however, who report mixed success in reproducing the data.
"Now, a new study from a research team headed by molecular reproductive biologist Kui Liu of the University of Gothenburg in Sweden, published yesterday in the Proceedings of the National Academy of Sciences (PNAS), adds another note of caution. The work centers on a protein known as Ddx4 (also called Mvh) that appears during development in the germ cells that will give rise to sperm or eggs."
"Based on that data and several other lines of evidence, including experiments where the researchers attempted to cultivate new egg follicles in sterilized ovarian mouse tissue, Liu's team concludes that no egg-producing stem cells exist in mouse ovaries after birth—a summary that has met both hearty agreement and sharp criticism."
Dubbed GJ676A, the system has two rocky planets orbiting close to its host star, and two gas giants orbiting far away. This means the system is arranged like our system—though in GJ676A, everything is much larger. For instance, the smallest rocky planet in GJ676A is at least four times the mass of Earth, while the largest gas giant is five times the size of Jupiter.
Other multiple-planet systems have been discovered, such as HD10180, which has been called the richest exoplanetary find ever because of the seven to nine planets orbiting its host star.
Tom Goldtooth of the Indigenous Environment Network calls the tar sands exploration in Canada the worst single example of polluting that he has ever witnessed and warns against the privatisation of nature.
Join leading researchers Dr. Eric Horvitz of Microsoft Research and Dr. Peter Norvig of Google for an intriguing discussion about the past, present, and future of artificial intelligence, moderated by KQED's Tim Olson.
"Global warming is a big issue. If we're honest and we look carefully at the data, it's beyond question that the atmosphere of our planet is warming. It's also beyond any honest question that the preponderance of the evidence is that human behavior is the primary cause. It's not impossible that we're wrong - but when we look at the real evidence, it's overwhelming.
Of course, this doesn't stop people from being idiots."
Here is a man who has just lost the culmination of 23 years of his life and he has the humility to be concerned for everybody else. This, for me, highlights the difference between people who accept the scientific facts and those who don’t. There is no self-interest there. His concern is for his fellow man. Deniers will feign concern for their fellow man through suggestions that its a scam designed to take away everybody’s freedom or increase tax or whatever nonsense but deep down that is nothing more than blatant self-interest. One can imagine a denier in the same position as this man, looking for someone in the government to blame while crying over the loss of their wealth and trinkets.
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