Carbon nanoparticles toxic to adult fruit flies but benign to young
... adult Drosophila in a control test tube and test tubes
containing four different types of carbon ... multiwalled carbon nanotubes. Flies in the test tubes
with no carbon nanoparticles, C60 and the multiwalled nanotubes climbed up the tubes
with few or no difficulties. But the batches of ...
Spun-sugar fibers spawn sweet technique for nerve repair
... filaments to create a scaffold of tiny synthetic tubes
that might serve as conduits to regenerate nerves ... water, leaving behind bundles of hollow polymer tubes
that mimic those found in nerves, said Riyi Shi, ... nerves, which are made of thousands of small tubes
bundled together. ...
Caltech scientists create DNA tubes with programmable sizes for nanoscale manufacturing
... a simple process for mass producing molecular tubes
of identical--and precisely ... feat may allow the use of the molecular tubes
in a number of nanotechnology applications.
The molecular tubes
are composed of wound-up strands of DNA. DNA has ...
UT Knoxville professor finds unexpected key to flowering plants' diversity
... process. In flowering plants, though, pollen tubes
are able to cover longer distances to the egg by ... evolutionary family tree -- grew shorter tubes
of pollen than those that went on to evolve into ... angiosperms, the older plants grew shorter pollen tubes
and took longer to do so than more diverse modern ...
Ultrasonic frogs can tune their ears to different frequencies
... middle ear. The changing state of the Eustachian tubes
was more readily observed by directing a light ... from under the frog's chin. When the Eustachian tubes
were open, the light was visible through the ... frogs, it is plainly stated that the Eustachian tubes
are permanently open!"
Feng and his colleagues ...
Mate choice in plants
... pollen is compatible, it will germinate and send tubes
through the extracellular matrix (ECM) of the ... of the pollen takes place. Compatible pollen tubes
grow unhindered toward the ovary. Incompatible pollen tubes
become distorted and stop growing. The ...
Biologists find unusual plant gene: abstinence by mutual consent
... Arabidopsis, the scientists found that the pollen tubes
did not burst when they came close to the female ... the sperm cells were not expelled from the pollen tubes
toward the female cells. Instead the pollen ... this signal only cause bursting of the pollen tubes
once the pollen tube gets close to the female ...
MIT works toward engineered blood vessels
... that can serve as a template to grow capillary tubes
aligned in a specific direction.
The ... a flat surface, which form a network of capillary tubes
extending in random directions, cells grown on ... he said.
The next step is to implant capillary tubes
grown in the lab into tissues of living animals ...
Spaceflight shown to alter ability of bacteria to cause disease
... Nickerson and colleagues sent specially contained tubes
of Salmonella in an experimental payload aboard the Space Shuttle Atlantis. The tubes
of bacteria were placed in triple containment for ... to grow in a separate compartment of the tubes
called the growth chamber, said Nickerson. The ...
2009 ASPB Summer Undergraduate Research Fellowship award announcement
... analysis of two Arabidopsis AGC kinases during polarized growth of pollen tubes
Working with Professor Sheila McCormick and Postdoctoral fellow Yan Zhang on the polarized growth of pollen tubes
in Arabidopsis, has taught me the dedication necessary to continue in ...
Superglue from the sea
... worm is an inch or so long, and an eighth-inch in diameter. But they build tubes
several inches long, using sand grains and shell fragments.
"They will ... use any handy building material, using their natural adhesive to build tubes
by gluing together tiny pieces of egg shell, glass beads, red sand, bone, ...
UNC study on properties of carbon nanotubes, water could have wide-ranging implications
... to hydrophilic or 'water-liking'."
The UNC team did this by making the tubes
colder. Using nuclear magnetic resonance similar to the technology used ... of carbon nanotubes take in water only reluctantly.
However, when the tubes
were cooled to 8 degrees, water easily went inside. Wu said this shows ...
U of T discovers environmental factors linked to sex ratio of plants
... when females capture large amounts of pollen, female-determining pollen tubes
out-compete male-determining pollen tubes
to fertilize the single ovule in each flower.
Barrett leads a ...
Animal and plant communication at the ESA Annual Meeting
... coauthor Katherine Bennett, a fifth grade teacher working under a National Science Foundation Research Experience for Teachers grant, placed painted tubes
mimicking pitcher plants' natural color spectrum of redness into the plants' habitat. They found that red coloration didn't affect the number of ...
Little-known protein found to be key player
The tests showed that cells with extra atlastin had an overdeveloped endoplasmic reticulum (ER), a system of interconnected membrane tubes
and chambers that's critical for normal cell function. The tests also showed too little atlastin led to a fragmented ER. Flies with defective ...
Music is the engine of new U-M lab-on-a-chip device
... their collaborators replaces these air hoses, valves and electrical connections with what are called resonance cavities. The resonance cavities are tubes
of specific lengths that amplify particular musical notes.
These cavities are connected on one end to channels in the microfluidic device, and on ...
When children have breathing problems
... children were asked to blow into measuring devices first hard and then slowly. This provided a measurement of the extent to which their bronchial tubes
were constricted and therefore limited in function.
When all these measurements were concluded in La Plata at the end of 2006, thousands of pieces ...
American Chemical Society's Weekly Presspac -- June 17, 2009
... Fax: 81-569-24-5028
ARTICLE #5 EMBARGOED FOR 9 A.M., EASTERN TIME, June 22, 2009
No more test tubes
on four feet? EPA moves toward animal-free toxicity tests
Chemical & Engineering News
The U.S. Environmental Protection Agency (EPA) plans ...
Crustacean shell with polyester creates mixed-fiber material for nerve repair
... applications. Mixing chitosan, found in the shells of crabs and shrimp, with an industrial polyester creates a promising new material for the tiny tubes
that support repair of a severed nerve, and could serve other medical uses. The hybrid fiber combines the biologically favorable qualities of the ...
Plant microbe shares features with drug-resistant pathogen
... to produce glue-like substances, or biofilms, which allow them to adhere to plant roots, in one case, and medical devices such as ventilation tubes
and intravenous catheters, in the other. Such devices are a common source of exposure to opportunistic pathogens for hospital patients.
Slicing chromosomes leads to new insights into cell division
... to arise out of the interaction between protein motors on the arms of chromosomes that push against cells' microtubules. Microtubules are long, thin tubes
that form a central component of the cytoskeleton and the mitotic spindle. They serve as intracellular structural supports and as railways along ...
Saved by junk DNA
... to tune the activity of genes to match changing environments -a vital principle for survival in the endless evolutionary race.
Evolution in test tubes
To further test their theory, the researchers conducted a complex experiment aimed at mimicking biological evolution, using yeast cells as ...
Preventing ear infections in the future: Delivering vaccine through the skin
Currently infections are managed with antibiotics; however, the emergence of antibiotic-resistant microorganisms is of concern. Surgery to insert tubes
through the tympanic membrane relieves painful symptoms, but the procedure is invasive and requires the child to be under general anesthesia. Thus, ...
ExcellGene and Khner achieved milestone in development of novel 250 Liter mammalian cell culture bioreactors
... cultures, while oxygenating cells through the head space. The cylindrical vessel contains a disposable, sterile bag with appropriate connection tubes
for seeding, feeding, gas supply and harvesting of the culture. Compared to classical stirred tank bioreactors, OrbShake-bioreactors are much simpler ...
Sugar on bacteria surface serves as base for a web of resistance
... can attach are key to their success, meaning that in addition to thriving in congested lungs, they also grow on catheters, ventilators and tracheal tubes
any medical device that enters the body. But preventing bacterial biofilm development has implications beyond medicine.
Fortified by the moist ...
Wild bees can be effective pollinators
... Tuell. "There are also a number of commercially manufactured options that growers can use, such as foam blocks with pre-drilled holes and cardboard tubes
made to a particular diameter to suit a particular species of interest. Drilling different sized holes in wood is another option. If a grower is ...
Vanderbilt scientists invent world's smallest periscopes
... the 3D position of the centrosome the specialized region of a cell next to the nucleus that is the assembly point where the microscopic polymer tubes
that serve as part of the cell's cytoskeleton are assembled before cell division and broken down afterwards.
The mirrored pyramidal wells provide ...
NC State study finds genes important to sleep
... of the 40 lines were homozygous, or exactly the same genetically, but the lines were completely different from one another, Mackay says. Small glass tubes
containing one fruit fly and some food were placed in a machine that uses infrared sensors to monitor the minute-by-minute activity of the flies. If ...
Nanotube's 'tapestry' controls its growth
... found the highly touted nanomaterials grow like tiny molecular tapestries, woven from twisting, single-atom threads.
Carbon nanotubes are hollow tubes
of pure carbon that measure about one nanometer, or one-billionth of a meter, in diameter. In molecular diagrams, they look like rolled-up sheets of ...
TECNALIA uses artificial vision to improve recycling of electronic scrap metal
... equipment requires manual tasks, making the process labour-intensive and very costly. For example, with television sets, only the cathode-ray tubes
are dismantled while the rest is crushed up. With other equipment, only the larger parts made of aluminium, copper or iron are separated, while the ...
Ancient geologic escape hatches mistaken for tube worms
... formation near Denver, Colorado, are actually 70 million-year-old escape hatches for methane.
Tubeworms, or siboglinids, look like long lipstick tubes
and have been observed in warm and cold environments on the ocean floor, as well as in whale carcasses and decomposing organic-rich cargoes in sunken ...
Crib-side studies help struggling newborns go home without feeding tubes
... quality of life, this study resulted in an estimated savings of $1.8 million in health care costs for the participants related to gastric feeding tubes
(G-tubes). It has been estimated that the health care costs for children on G-tubes is nearly $50,000 per patient for the first year, about the cost ...
Microbot motors fit to swim human arteries
... a quarter of a millimetre, wide.
Methods of minimally invasive surgery, such as keyhole surgery and a range of operations that utilise catheters, tubes
inserted into body cavities to allow surgical manoeuvrability, are preferred by surgeons and patients because of the damage avoided when contrasted ...
Researchers make breakthrough in the production of double-walled carbon nanotubes
... are synthesized, the process also creates many of the single- and multi-walled variety. Given their small size, sorting the valuable double-walled tubes
from the other types has posed a real challenge.
In a paper published today in the online edition of the journal Nature Nanotechnology , two ...
Miscarriage and infertility treatment increase pre-eclampsia risk
... risk, even though hormone stimulation is part of the procedure.
Different causes of infertility (polycystic ovary syndrome, blocked Fallopian tubes
etc.) can probably explain the difference in risk for pre-eclampsia. It is likely that factors in mothers that cause infertility may also give an ...
Using the other guy's toolkit: Similarities of pumping blood, oil examined
... using imaging to identify targets, navigate catheters and drills into those targets, maintain flow in pipelines and blood vessels, prevent these tubes
from clogging, repair them when they break down and improve the pumps when the pressure fails."
The presentations are designed to offer common ...
Caltech researchers get first 3-D glimpse of bacterial cell-wall architecture
... the peptidoglycan structure in three dimensions, which allows for a virtual 3-D tour of the bacterial sacculus.
"What we saw were long skinny tubes
wrapping around the bag like the ribs of a person or a belt around the waist," says Jensen. "We also saw that the sacculus is just a single layer ...
Compact research freezers to debut in space
... and the International Space Station (ISS).
Capable of minus 160 degrees Celsius, the small, portable freezers can hold laboratory trays, test tubes
and various research containers used in biology, chemistry, physics, medicine and other space-based experiments, CBSE engineers said.
The freezer ...
Caltech biologists spy on the secret inner life of a cell
... including multivesicular bodies and other more tubular vesicles, looped around each other into an unexpected "tangled mess," often forming long tubes
that then broke off into the small vesicles that carry antibodies through the cell. When those vesicles arrived at the blood-vessel side of the cell, ...
MSU scientists find new gene that helps plants beat the heat
... cytosol, the fluid inside cells, play a role in how plants respond to heat. The endoplasmic reticulum, a membrane in the cell that consists of small tubes
and sac-like structures, is mainly responsible for packaging and storing proteins in the cell.
According to Christoph Benning, MSU professor of ...