Chestnut trees to spread across landscape again, says Purdue scientist
... injuries in the tree's bark, spreads to the inner layers and blocks the flow of nutrients through the tree, eventually killing it. Jacobs said the disease first appeared in 1904, and within 40 years, it had spread to every area of the tree's range. "Nearly every tree in the range was killed," ...Vascular access vital to pump up tissue engineering
... of blood vessels are laid down within the various layers and the tissue constructs grow their own capillaries when the appropriate growth factors and cells are added. Apart from this physiological issue, another major factor that hinders acceptance of breakthrough technologies of tissue engineering as stan......od are active in the mesoderm, the middle of three layers in an embryo. The mesoderm becomes muscle, bone, cartilage, heart and circulatory system, and the urinary and genital system, including kidneys. Mauch's study used the new method to illuminate sites within a 36-hour-old chicken embryo where an...Paleofire database puts fire-scar and charcoal data online
...e events from tree-ring evidence and from charcoal layers in lake sediments. The database is on the National...ike the fire-history scientists who study charcoal layers in lake sediments, the tree-ring scientists found that more frequent fires relate to drought. They a...New DVD 'virtual' microscope at UNC-Chapel Hill
... annotate them and label anatomical structures and layers using common computer applications. The medical histology DVD at UNC differs from other such technology in linking syllabus text directly to specific images, making a paper manual unnecessary. In addition, the technology does not require switching be...ESA prepares mission to search for life on Mars
...ellent opportunity to gain access to ice-rich soil layers - and possibly the first definitive evidence of primitive Martian life....Molecular mechanisms that trigger flowering in spring
...nalysis of CONSTANS has also demonstrated distinct layers of regulation that were not foreseen by the physiological experiments carried out by Bnning and others. In addition to stabilising CONSTANS protein at the end of the day, the Cologne group showed that light detected by another photoreceptor, phytochr...Comets spread Earth-life around galaxy, say scientists
... bury themselves in the radiation-shielded surface layers of frozen comets. A belt of such comets, the Edgeworth-Kuiper belt, lies beyond the planetary system. This belt gradually leaks comets into interstellar space, some of which will eventually reach proto-planetary discs and star-forming nebulae. There ...The scoop on poop: Insect feces, dead leaves may provide clues to health of world
... Island, scientists are linking the two rainforest layers in one overall tropical examination. "The rainfore...ition scientists are connecting the two rainforest layers by examining the effects that canopy materials such as insect feces (frass), green leaves, dead ins...If airbags work well, then Mars landing sites can be chosen more boldly, says UB geologist
...here is a high possibility that we will get to see layers of ancient rock, deposited when Mars was warm and ...ty, Gregg will have her eyes peeled, searching for layers in the walls of the dried-up river channels. "Those layers could be lava flows," explained Gregg, n...Sediment samples suggest how plants would fare in hotter, drier future
...uced by fires and well preserved in the stratified layers of sediment. Because of the presence of aragonite, a carbonate mineral, at West Olaf Lake, climate data were extracted by using X-ray diffraction. Climate conditions at Steel Lake came from oxygen-18 isotope levels. "These analyses gave a picture o...AGU journal highlights - 6 January 2004
...is caused by dust particles. Theynote that the two layers are separated by gravitational properties ofthe dust that keeps it segregated, evidence that has been confirmedby rocket-based observations of dust remnants behind othermeteors. The researchers dismiss previous speculation that thedouble tails were t...A big surprise: Young nerve cells can rewind their developmental clocks
...e its complexity, the cortex comprises six orderly layers of cortical cells that are laid down during develo...igrate to the innermost layer, layer 6. Subsequent layers pile up above layer 6 (between layers 6 and 1), and in descending numerical order from 5 to 2. Each ...Ocean life depends on single circulation pattern in Southern Hemisphere
...as shown that ocean water does not mix well across layers of equal density, which are mostly oriented horizo...s, it takes a long time for nutrients to cross the layers and return to the surface. Without a mechanism to bring deep water back to the surface, the oceans w...Scientists discover how anthrax creates its deadly spores
....Like a golf ball, anthrax spores are made of many layers of material,which protect DNA in the core. The spore's tough outer coat is surrounded by a loose-fitting layercalled the exosporium. When the spore gets inside a human or animal host- the first step in the infection process - sensing agents in theexo...Microscopes provide new view for tissue engineering
...mensional process has been limited to the top-most layers of the scaffolds used to coax and sustain cell development. Composed of biodegradable polymers or other building materials, scaffolds are seeded with cells that grow, multiply, and assemble into three-dimensional tissues. Whether the cells respond an...Nutrient-poor oceans generate their food 'hot spots'
...ntermixing which prompts intermingling between the layers of warm water at the surface and the deep cold nutrient-rich water levels. This mixing wouls generate surface influx of nitrates, favourable for phytoplankton development. This hypothesis cannot explain, however, why the chlorophyll concentration pea...Bush Administration plan to reduce global warming could devastate sea life
...phere. As atmospheric CO2 diffuses into the upper layers of the water, it inhibits the ability of shellfish to form shells and causes coral reefs to dissolve. Deep-sea creatures are even more sensitive to environmental changes, he said. In some species, their metabolism would become suppressed and lead ...Golfing toward a greener environment
...s just six to nine millimeters in diameter between layers of sand and peat root mix and gravel, both of whic...s thick. The researchers studied the role of these layers in the lab, as well as on the field in three-by-three meter plots at the O.J. Noer Turfgrass Researc......ial, even if it is in a locked freezer behind five layers of security, then be held criminally accountable for any mysterious disappearance when it is almost certainly only sloppy record keeping," says another researcher, "then I'll work on Paramecium [a pond protist] and leave the select agents to someone ...