size 2 7

Tag: "size" at biology news

The roots of civilization trace back to ... roots

...or grinding roots instead of shearing leaves. The size of the teeth and jaws reflect the apes' secondary food source (roots) instead of primary foods like meats and fruits, which do not require such massive chewing abilities. While our ancient ancestors may have left the rain forest for the savannah in...

“Hitchhiking?Viruses as Cancer Drug Delivery System

...or grinding roots instead of shearing leaves. The size of the teeth and jaws reflect the apes' secondary food source (roots) instead of primary foods like meats and fruits, which do not require such massive chewing abilities. While our ancient ancestors may have left the rain forest for the savannah in...

Researchers Create DNA-Based Sensors for Nano-Tongues and Nano-Noses

...g tiny amounts of a specific molecule." Given the size of such sensors each carbon nanotube is about a billionth of a meter wide, Johnson and his colleagues believe arrays of these sensors could serve as passive detection systems in almost any location. The sensor surface is also self-regenerating, with ...

UCSD discovery may provide novel method to generate medically useful proteins

...antibodies have a complicated loop structure. The size of the loops varies in addition to the amino acid building blocks that constitute the antibody protein. Although this mechanism can generate more than 100 trillion different antibodies, the researchers say replicating it in a test tube would be very...

Disappearing arctic lakes linked to climate change

...arming may be causing a decrease in the number and size of Arctic lakes. The issue is the subject of a pap...older permafrost regions. Many lakes decreased in size or dried up completely, while other lakes actually increased in size. Researchers say as the climate...

New law for resolution allows unprecedented sharpness in fluorescence microscopy

...fluorescence spot can, in principle, be reduced in size to the size of a molecule (2-5 nm). This is due to the fact that the spot size is no longer subject to Abbe's fo...

Trio of plant genes prevent 'too many mouths'

...athway required for plants to grow to their normal size appears to have an unexpected dual purpose of keep... densely clustered stomata. "It's surprising that size and stomata patterning ?both key to plants being able to survive on dry land ?are using the same sig...

Virus uses tiny RNA to evade the immune system

..., known as SV40, in the belief that its diminutive size would make it easier to understand the functions of any microRNAs they found. SV40 is a relatively harmless monkey virus that can cause kidney infections in its natural simian host. In rodents, however, it can cause cancer. Although the SV40 genome ...

Hidden sponges determine coral reef's nutrient cycle

... Underwater camera To determine the nature and size of this role, Scheffers first of all examined the precise appearance and quantity of these virtually inaccessible caves and their living communities. He did that on the Caribbean island of Curaao using a special underwater camera. The films shot reve...

Nanotechnology to provide portable genetic risk detection

...this field." The final device will be roughly the size of a human hand, allowing it to be used in doctors' surgeries to determine the genetic predisposition of a patient to certain diseases in a matter of minutes. That compares to the hours or even days it can take to carry out the same analysis in a lab...

NHGRI expands effort to revolutionize sequencing technologies

...n efficient method capable of sequencing mammalian size genomes by amplifying single template molecules, and subjecting the product to Sanger sequencing and a highly parallel, capillary electrophoresis separation system. Greg Kellogg, Ph.D., Network Biosystems, Woburn, Mass. $4.5 million (3 years) "$100,...

Discarded placentas deliver researchers promising cells similar to embryonic stem cells

...ic stem cells, they still can double in population size about 20 times over without needing another cell type serving as a feeder cell layer. This is significant, because to replicate, the currently available embryonic stem cell lines require a bed of mouse cells, traces of which can end up in each new ge...

Scientists get first glimpse at how plants, most animals repair UV-damaged DNA

...rms a water-filled pocket with the right shape and size to accommodate the dimer for the repair. Normally, the enzyme wouldn't be able to reach the dimer, which is hidden inside the coiled DNA molecule, Zhong said. But electrical interactions between the DNA molecule and the enzyme cause the portion of th...

Human brain is still evolving

...quence variations in two genes that regulate brain size in human populations have found evidence that the ...rome in which the brain develops to a much smaller size than normal. In earlier studies of non-human primates and humans, Lahn and his colleagues determine...

Female butterflies go for sparkle -- not size -- when choosing to mate

Size doesn't matter, at least not the size of the eyespots on a male butterfly's wings when f...n induced a dozen subtle variations in the eyespot size and pattern of males and then studied how they influenced female's mating decisions. "It's very eas...

Study shows big game hunters, not climate change, killed off sloths

...rgest of the prehistoric ground sloths grew to the size of a modern elephant and fed on bushes and the leaves of lower branches of trees, today's only surviving descendants are several small tree sloths whose range extends from southern Mexico to southern Brazil, he said. Such an experiment might be simi...

Method slashes quantum dot costs by 80 percent

...ptical properties by growing them to precisely the size they want by adjusting the cooking time. The solv... team now has a method for predicting the particle size and growth behavior of quantum dots based on only three physical properties of a given solvent: visc...

Biologist Discovers What May Be World’s ‘Pickiest?Mates

... experiments, appears to be strongly linked to the size of their mate and, more importantly, his corresponding abode. “The size of the male’s burrow affects the development time of his larvae,?she said. “A burrow of just the rig...

Weapon performance determines mating success in the collared lizard

...such phenotypic variation can include that of body size and weapon morphology, as well as of weapon functi... force) is a better predictor of fitness than body size and weapon size. The study finds that bite-force performance was a strong predictor of reproductive...

Bone marrow stem cells may heal hearts even years after heart attacks

..., and there was a significant reduction of infarct size by 30 percent. Concerning all those parameters, no significant changes were seen in a representative control group. Moreover, after bone marrow cell transplantation, an improvement of maximum oxygen uptake by 11 percent and of 18F-fluor-desoxy-glucos...

1 2 3 4 5 6 7 8 9 10