Tag: "forces" at biology news
Stretching DNA to the limit
...robe microscope and stretch it while measuring the forces
generated. These "stretchrelease" measurements enable the accurate determination of changes in the elasticity of the DNA strands. Upon exposure to UV light, the force profile of the viral DNA changes dramatically in a dose-dependent manner. The force...
Humans aren't the only ones with obesity problems
...g on a swing set. The extra weight in obese horses forces
the connective tissue to tear and the bone breaks through the nail-like texture of the hooves. Veterinarians have yet to find an effective treatment for the condition. In the worst cases of laminitis, veterinarians are forced to euthanize the horse. ...
UD scientist wins NSF career award for tissue engineering research
...t can respond rapidly and reversibly to mechanical forces
for long periods. Mechanically active tissue is found in many areas of the human body--the heart, for example, beats an average of 70 times a minute when you are resting, and the vocal folds vibrate more than 100 times a second when you are speaking....
AACR, FDA and NCI announce cancer biomarkers collaborative at the AACR 2007 annual meeting
...on for Cancer Research. "Therefore, we are joining forces
with our partners to find new ways of exploring the use of biomarkers in cancer detection and treatment, without sacrificing high standards for safety and efficacy." "The FDA's Critical Path is an important initiative that aims to modernize the...
Ancient amphibians evolved a bite before migrating to dry land
...o each other during feeding. By analyzing the tiny forces
that the sutures experienced during feeding, such as tension or compression, the researchers could determine how the skull roof likely deformed as the animals ate. Living fish exhibit an incredible array of tooth and jaw shapes, suggesting that, ir...
New way to catch cancer's spread, rapid 3-D retinal imaging, more at CLEO/QELS 2007
...ich use optical energy to create powerful electric forces
in carefully prescribed places, differ from ordina...rs," which use optical energy to create mechanical forces
that can push things around. According to Berkeley's Aaron Ohta, the optoelectronic approach uses mu...
Do we need a paradigm change? Disputing coevolution in herbivorous insects
...lution and a straightforward interpretation of the forces
driving evolution and the rise of new species. However, a new molecular study by Dr. Jess Gmez-Zurita and collaborators in the Natural History Museum in London challenges this view. This study shows that at least in the leaf beetles (Chrysomelidae;...
Bronfman gift to Mount Sinai catalyzes genomics-based medicine
...opies. "In an industry like medicine, where market forces
are slow to change, philanthropy must play the role of catalyst facilitating growth, inspiring awareness, and serving as a basis for change. The Mount Sinai Medical Center has been a pacesetter in the area of personalized medicine and is a clear cho...
Scripps research scientists identify new regulatory mechanism for critical protein signaling domain
...exists as an aggregate; IP4 binding to one subunit forces
changes in the other subunit(s) so that they bind PIP3 with greater ease. This process is commonly known as an allosteric or cooperative mechanism. Sauer offers a helpful analogy for the newly uncovered mechanism: "IP4 acts very like a clever engin...
Right angles are all wrong for tree frog adhesion
... this, scientists measured adhesive and frictional forces
simultaneously on individual toe pads of Whites tr...ion to peeling is a gradual process, with adhesive forces
weakening at angles above 90. Thus frogs maintain a grip by keeping the angle of their toes with res...
Atlas of Science Literacy completes mapping of science-learning pathways
...e and science education organizations today joined forces
to release a set of maps showing how science literacy can develop over time. Maps in the two-volume Atlas of Science Literacy offer teachers a grade-by-grade guide to science learning from kindergarten through 12th grade. Atlas maps show the i...
Setting sights on the drugs of the future
...rchers at the University of Nottingham have joined forces
with one of the worlds leading pharmaceutical companies, AstraZeneca, to single out potential medicines of the future. In a unique collaboration between academia and the pharmaceutical industry, teams of experts from both sides gathered together at...
Engineering the heart piece by piece
... that the BEHM was capable of generating pulsating forces
and reacting to stimulation more like real muscle ... using a specially made device that can both apply forces
and measure the forces
generated when the tissue begins contracting and beating on its own. In the n...
Ultrathin films deliver DNA as possible gene therapy tool
...re promising. "The films survive basic mechanical forces
associated with placement and expansion of stents,...accept the next layer of DNA. While electrostatic forces
between the layers keep the film stable in dry, room-temperature conditions, the polymers break down...
No pain, DOE Joint Genome Institute gains coveted ergonomics prize with 'Shake 'N Plate'
...illed plates weighing up to 7 lbs. The hand grasp forces
and total weight during long processing times made this an unpleasant and fatiguing task. The "Shake 'N Plate" is a lightweight sheet metal platform mounted on a ball joint similar to a camera tripod. In fact, one of the operators used the camera t...
Viral enzyme recruited in fight against ear infection
... virus hijacks the cells biochemical machinery and forces
it to make many copies of the virus. After the new crop of viruses is made, a viral enzyme breaks apart the infected bacterial cell wall and allows the new viruses to escape and infect additional cells. The success of the new treatment, which uses...
Do you need sex to be a species?
...s true evolutionary entities. And if they do, what forces
determine how they diverge? In the traditional view of species diversification, interbreeding promotes cohesion within a populationmaintaining the speciesand barriers to interbreeding (called reproduction isolation) promote species divergence. With n...
New synthetic self-assembling macromolecules mimic nature
...ers can be instructive models in understanding the forces
that lead to the dense packing of DNA when complexed with viruses and other polymers," he said. ...
Scientists find genes involved in the battle between Hessian flies and wheat
...el of certain proteins in susceptible plants. This forces
the plant to feed the larvae. On resistant plants, Hessian fly larvae encounter defense mechanisms that include poisonous oxygen compounds, Shukle said. These compounds, also called reactive oxygen species, can be produced either by the plant or wi...
Drivers and passengers on the road to cancer
... mutated driver genes produced by a wider range of forces
than we expected." All cancers are believed to be due to mutations abnormalities in genes. The availability of the human genome sequence has opened the door to analysing hundreds to thousands of genes, which will ultimately allow us to acquire a c...
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