Tag: "clay" at biology news
Save the rainforest - eat a tree
...eruvian rainforest, many trees live on fertile red clay
soil, while others live on nutrient-poor white san... In the new study, the scientists transplanted red clay
tree species onto white sand soil, and transplanted white sand tree species onto red clay
Seabed secrets in English clay
...d. "There was the deposition of organic matter and clay
during one set of environmental conditions, then when conditions changed and became favorable, different organisms colonized the environment and left their remains, some as a result of a mass kill by the next anoxic -- or complete lack of oxygen -- e...
Bacteria discoveries could resemble Mars, other planets
...carbon were enriched at the boundary zones between clay
and basaltic glass another sign of bacterial activity. They then used electron microscopy that revealed tiny (two- to three-micrometer) spheres that looked like microbes in those same parts of the rock that contained the DNA and protein building bl...
Clay may have aided formation of primordial cells
...on of vesicles, it would not be inconceivable that clay
particles that had RNA on their surface could end ...out. "Thus, we have demonstrated that not only can clay
and other mineral surfaces accelerate vesicle assembly, but assuming that the clay
ends up inside at...
Unique two-part macroemulsion offers new approach to cleaning up contaminated aquifers
...pplies lack natural boundaries such as impermeable clay
or bedrock. To keep the dense nonaqueous phase liquids (DNAPL) from flowing deeper into the earth, engineers have injected alcohols such as n-butanol into the pollution mass to lower its density. They have also injected surfactant chemicals food or...
Study shows prions stick around in certain soils
...nt, Pedersen and his colleagues turned to sand and clay
- common components found in soils. Because of dif...ea and mineral composition, Pedersen says sand and clay
represent different ends of the spectrum in the ability to absorb proteins. From the study's results...
The seashell's inner beauty
...ke material that consists of alternating layers of clay
and a type of polymer called a polyelectrolyte. K...rtificial nacre, platelets of a negatively-charged clay
called montmorillonite provide the bricks while fibers of a positively-charged polyelectrolyte calle...
Physics tip sheet #33 March 28, 2003
...eers and materials scientists have long known that clay
bricks and other fired ceramics expand as they age owing to the absorption of water from the atmosphere. In general, however, studies of moisture expansion in bricks have been limited to freshly fired bricks over short timescales. Now researchers hav...
Sex, flounder and donuts
...eet deep, the rings are found in soft fine-grained clay
found in the deepest parts of the lake, and are believed to be less than 10,000 years old. This clay
is known to exhibit dramatic changes in volume and may be tied to the origins of petroleum and of li...
Science picks leads, feeds and story seeds (October 2002 edition)
...how seismic "waves" move through the deep sand and clay
layers of sediment that are characteristic of the Mississippi. The explosions will create seismic waves similar to what happens during a real earthquake. Scientists will use newly installed strong motion seismographs part of a national first-line ...
Clay sprays control HABS; disease may affect more than salmon
...n Anderson and Mario Sengco are testing the use of clay
to manage and control HABs. Clay, mixed with seaw...to mimic field conditions, results showed that the clay
removed 80 to 90 percent of the toxins in 2-hour treatments. Korea and Japan have used clay
Rogue trees get criminal treatment from scientists.
...rectors, explained how it works: "Houses built on clay
are particularly at risk from subsidence, and more...ots suck water out of the ground, which causes the clay
supporting the house to dry out and contract. "We would typically get involved in a dispute over wh...
Muddy Mayan mystery made clearer by researchers working in the bajos
...Preclassic era, this layer was buried in layers of clay
sediment. Judging from these layers, the team says, farming began to deforest the landscape as the Maya population escalated. With the forest cleared, erosion accelerated. Rain carried sediment into the bajos, where "they would become plugged up," s...
Dearborn, Mich., researchers receive award for improving automobile plastics
...es, that use molecule-size mineral fillers such as clay
for reinforcement instead of glass or talc. Lee a...ltrasonic energy to evenly distribute the silicate clay
particles throughout the plastic's polymer matrix. This new generation of automobile plastics is str...
Improving water use in growing corn possible, study shows
...l into these waters," Alley said.Soils with higher clay
contents and greater capacities to retain water produced higher yields, had less runoff and drainage losses, and had higher water-use efficiencies than sandy soils with lower capacity to hold rainfall. The research showed that certain soils can have ...
Protecting drinking water from disease transmission by means of zeolite filters
...nts to block virus migration in ground water. Like clay
minerals, zeolites have a large surface area, providing more places for viruses to adhere. Unlike clays, however, zeolites do not swell in water but remain rigid, serving as a filter through which water can pass freely. Zeolites possess a negative s...
NATO picks promising pollution solution at NASAs Marshall Center for pilot study program
...d the rubble zone a transitional area between the clay
soil and the limestone bedrock -- as well as on treatment of the clay
soil above the rubble zone where there is a significant amount of contamination. In one area, design...
Portable unit created to treat wastewater in remote locations
...degrade the waste using a fixed media comprised of clay
beads. Bacteria are grown on the beads, which all...ces. Combining the stainless steel screens and the clay
beads results in a compact treatment unit that can treat 30,000 gallons per day of wastewater. Usi...
The K-T impact extinctions: Dust didn't do it
...caused global cooling. The original studies of the clay
layer found at the K-T boundary assumed much or all of this layer was derived from fine impact dust, he said. More recent studies of this layer have shown this not to be the case. Furthermore, earlier estimates were based on extrapolations of data ...
Clean water for Nepal is focus of MIT research
...teel, water flows through a "candle" of fine white clay
eight inches long by two in diameter. Particles are caught in the candle, and the remaining water drains out via a spigot. Rural women, however, cant afford the system at some $25 per unit. Further, Sagara found that candle filters are slow. "They c...