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Such a superlens could create images that include detail finer than that allowed by the diffraction limit, which constrains the performance of all positive-index optical elements. Although most experiments with metamaterials are performed with microwaves, they might use shorter infrared and optical wavelengths in the future. SCIENTIFIC A MERIC A N Another important indicator of the optical response of a material is its refractive index, n. The refractive index is ␧ʲ␮ʲ . In simply related to ␧ and ␮: n = ± ͌ʲ every known material, the positive value must be chosen for the square root; hence, the refractive index is positive.

The tumor-generating cells share key traits with stem cells, including an unlimited life span and the ability to generate a diverse range of other cell types, and are therefore considered cancer stem cells. These malignant progenitors are believed to spring from regulatory failures in damaged stem cells or their immediate offspring. Cancer treatments must target cancer stem cells to eradicate the disease. SCIENTIFIC A MERIC A N J U LY 2 0 0 6 HIERARCHY IN BLOOD-FORMING CELLS Stem cells in the blood-forming, or hematopoietic, system illustrate principles governing the activity of stem cells in other tissues as well.

46 SCIENTIFIC A MERIC A N ODDLY YOUNG STARS on the outskirts of the Andromeda galaxy (inset) could be shards from a galaxy collision. ) 5 Galactic Archaeology Astronomers think that large galaxies such as the Milky Way and neighboring Andromeda grew by assimilating smaller ones. The record of this tangled past should be written into the arrangement, ages, compositions and velocities of their stars. Hubble has been instrumental in deciphering this history. An example was its observations of Andromeda’s stellar “halo,” the tenuous spherical cloud of stars and star clusters that surrounds the main galactic disk.

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A grammatical study of Beja by Richard A. Hudson


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