In summary:  As mentioned above, the CCE separates cells based on their sedimentation property but not specific features (e.g. surface protein, cell shape). It cannot separate different types of cells which have similar sedimentation properties. This means that previous purification needs to be done for mixed cell type sample. The CCE is also limited to cells which are able to be individually suspended in the buffer solution. Cells which always attach to something cannot be separated by the CCE. Eric Davidson  Eric Davidson may refer to:      Giant huntsman spider  The giant huntsman spider (scientific name Heteropoda maxima), found in Laos, is a species of huntsman spider ("Sparassidae"), a family of large, fast spiders that actively hunt down prey. It is considered the world's largest spider by leg span, which can reach up to . The colouration is yellowish-brown with several irregularly distributed dark spots on the rear half. The legs have wide dark bands before the first bend. Like all huntsman spiders, the legs of the giant huntsman spider are long compared to the body, and twist forward in a crab-like fashion. Apart from its size, the "H. maxima" can be distinguished from other species of "Heteropoda" by genital characteristics. On males, the cymbium is at least three times longer than the tegulum. The female is distinguished by a characteristically shaped epigyneal field with two anterior directed bands, and the course of their internal ducts. The giant huntsman spider is the largest member of the family Sparassidae, boasting a leg-span, and body-length. The largest known member of the Sparassidae known prior to the discovery of "H. maxima" was the Australian "Beregama aurea" (L. Koch, 1875) with a body length of about . (Other relatively large members of Sparassidae have been discovered in recent years, including "Cerbalus aravaensis", the largest in the Middle East). "Heteropoda maxima" was first described in 2001 by P. Jäger, after being discovered in a cave in Laos. Over a thousand new species of plant and animal were found between 1997 and 2007 in the Greater Mekong Subregion. A representative of the World Wide Fund for Nature stated that "some of these species really have no business being recently discovered", suggesting that it is surprising for such a large species to go undiscovered for so long.