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Tag: "forces" at biology news

Researchers track how spores break out of dormant state

...ance of Bacillus spores suggests that evolutionary forces have captured the mechanical rigidity and resistance of these amyloid self-assembling biomaterials to structure the protective outer spore surface,” Plomp said. When exposed to a solution that triggers germination, nanometer sized etch pits were s...

Crammed with charged DNA, pressure rises inside virus

..., San Diego has used laser tweezers to measure the forces exerted by the motor as it pushes the DNA into the...he capsid.” The researchers discovered that the forces in the capsid are slightly higher than predicted by theoretical calculations. They say this may be ...

Brightening prospects of using fluorescent nanotubes in medical applications

... put into an ultracentrifuge that subjects them to forces a few thousand times that of gravity. Centrifuging separates out a number of gross impurities. Hertel’s team discovered that if they remove the most buoyant layer from the centrifuge, let it set for a while and then put it back in the ultracentrifu...

New vaccine prevents CMV infection and disease in mice

...nt a novel target for the host’s T-cells to muster forces and attack the virus. Secondly, the vaccine also contains a “boost” from an inactivated virus, which generates an antibody response. Neither approach alone would give complete protection. “In mice, the vaccine not only fought the disease, but pr...

Magnetic computer sensors may help study biomolecules

...ticles, the spin-valve array could apply torsional forces strong enough to alter the structure or shape of the biomolecules. The NIST group is now working on a microfluidic chip that will accomplish this electronically, which would be a significant milestone for applications. Parallel processing of sing...

Scientists seek useful traits in wild cottons

...raises thrips on wheat, a favorite host plant, and forces them to move to neighboring cotton plants by killing the wheat with herbicide. "This produces massive thrips pressure on the cotton plants, and results in a lot of damage to those first four true seedling leaves," he said. "We measure the leaf...

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 w...

Researcher to study astronaut bone loss for space biology agency

...ide pool of applicants. "The loss of mechanical forces on bone in the weightlessness of space dramatically weakens bone," says Long. "The ability of humans to conduct prolonged missions to the moon and Mars will require that the structural integrity of the skeleton be maintained." Astronauts who spend...

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, i...

Is there a pilot in the insect?

...ceived only vaguely at the outset. These hidden forces underlying animal behavior can then be understood more exactly by permanently shuttling between biology and robotics. These principles have been tried and tested for millions of years, and today they need to be applied to aerospace, because the phas...

Bats prey on nocturnally migrating songbirds

...into their transcontinental journeys at night; the forces of a skilled, almost silent nocturnal hunter patrolling the infinite dark space await them... ...

Global 'sunscreen' has likely thinned, report NASA scientists

...shed last week, scientists found that the opposing forces of global warming and the cooling from aerosol-ind... important missing piece of the big picture of the forces at work on climate." The study uses the longest uninterrupted satellite record of aerosols in the...

HIV protein enlisted to help kill cancer cells

...ient way to get a messenger into cancer cells that forces them to respond to death signals. And they did it using one of the most sinister pathogens around ?HIV. "HIV knows how to insert itself into many different types of cells," says senior author William G. Hawkins, M.D., assistant professor of surgery ...

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. ...

Researchers hot on the trail of brain cell degeneration

...anen Institute of the University of Kuopio, joined forces with Docent Eleanor Coffey's team at the Turku Centre for Biotechnology to carry out the study as part of a series of successful collaborations between the two teams. The results of their study are published in the latest issue of Nature Neuroscience...

Nanotechnology shows promise as next wrinkle fighter

...spread in a thin film can break up the compressive forces on a plane and redirect them. Once the force is reduced below the critical buckling strain, the film will not buckle. No buckles, no wrinkles. The nanoparticles in the film can be stress busters without affecting the neighboring layers. "The wrink...

Why is the heart heart-shaped?

...hers propose that a balance of the cell’s internal forces (through contractility) with external forces (such as blood flow) is necessary to create the cell shapes that generate chamber curvatures. Disrup...

Stretching DNA to the limit

...robe microscope and stretch it while measuring the forces generated. These "stretch—release" 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 forc...

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...

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...

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