By Qin Z., Du W., Zeng Q.

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JOSE B. CIBELLI THE AUTHORS With a little luck, we hoped to coax the early embryos to divide into hollow spheres of 100 or so cells called blastocysts. We intended to isolate human stem cells from the blastocysts to serve as the starter stock for growing replacement nerve, muscle and other tissues that might one day be used to treat patients with a variety of diseases. Unfortunately, only one of the embryos progressed to the six-cell stage, at which point it stopped dividing. In a similar experiment, however, we succeeded in prompting human eggs—on their own, with no sperm to fertilize them— JOSE B.

In fact, telescopes on the ground and in space are showing the galaxy’s atmosphere to be as complex as any planet’s. Held by the combined gravitational pull of the stars and other matter, permeated by starlight, energetic particles and a magnetic field, the interstellar medium is continuously stirred, heated, recycled and transformed. ” Dense concentrations of gas— clouds— form near the midplane, and from the densest subcondensations, stars precipitate. When stars exhaust their nuclear fuel and die, those that are at least as massive as the sun expel much of their matter back into the interstellar medium.

Copyright 2001 Scientific American, Inc. Embryo Cloned early-stage human embryos— and human embryos generated only from eggs, in a process called parthenogenesis— now put therapeutic cloning within reach THEY WERE SUCH TINY DOTS, YET THEY HELD SUCH immense promise. After months of trying, on October 13, 2001, we came into our laboratory at Advanced Cell Technology to see under the microscope what we’d been striving for—little balls of dividing cells not even visible to the naked eye. Insignificant as they appeared, the specks were precious because they were, to our knowledge, the first human embryos produced using the technique of nuclear transplantation, otherwise known as cloning.

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10Gbs transmission over 100 km of standard single-mode fiber with a dispersion tunable chirped fiber grating by Qin Z., Du W., Zeng Q.


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