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Tag: "length" at biology news

A little telomerase isn't enough

...ical link between the health of stem cells and the length of the chromosome ends within them. Chromosome en...merase gene in non-laboratory mice, whose telomere length is similar to humans'. (Typical laboratory mice have very long telomeres.) He then bred these half-...

Researchers learn how blood vessel cells cope with their pressure-packed job

... cells that were stretched only 1 percent of their length contained actin fibers with no directional orienta...the rhythmic stretching from 3 percent of a cell's length to 10 percent, stretch fibers became increasingly oriented perpendicular to the stretching direction...

Purdue's gold nanorods brighten future for medical imaging

.... Tiny gold rods with a certain "aspect ratio" of length to width shine brightly when illuminated by light in this spectral region. The gold nanorods are ideal for a type of imaging called "two-photon fluorescence," which provides higher contrast and brighter images than conventional fluorescent imaging me...

Emerald Spectre haunts Ontario's ash forests

...small, metallic green beetle ?adults are about the length of a thumbnail ?was first detected following an unusual dieback of ash trees in southeastern Michigan and southwestern Ontario in the summer of 2002. A native of southeast Asia, the insect is capable of rapidly spreading with a little human help. Adu...

Tiny roundworm's telomeres help scientists to tease apart different types of aging

... In humans and, as we know now, in worms, telomere length is certainly not a limiting factor for lifespan," ...und that despite the close correlation of telomere length and cellular senescence in mammalian cells, worms with long telomeres were neither long lived, nor d...

Immune system has evolved to prevent autoimmune disease

...ggests that a correlation does exist, but that the length of the infection prior to onset of autoimmune disease is highly variable. "People have been looking for a clear, significant correlation in time, but a long distribution of onset times would lead to weaker statistical correlations, particularly in ...

North & South American researchers find architectural abnormalities in T. cruzi ribosome

...ughly as far away from the turret and spire as the length of the 39-nucleotide leader sequence. "It could provide a unique scanning mechanism different from other eukaryotes," Frank said. "For instance, the splice leader of the mRNA might attach at the turret, which may swivel out and drag the mRNA across ...

Molecular mechanism of feather formation found

...in the developing barb. "Each barb ridge grows in length by recruiting new cells, which proliferate at the growing base of the feather germ, to join the base of that barb ridge," Harris says. "The variations in the initial number of barb ridges will directly affect the shape, and consequent function, of th...

Long-sought flower-inducing molecule found

...growing in spring, summer or fall by measuring the length of the day. One could also show that plants use their leaves to sense the length of the day. By grafting leaves from plants that had been induced to flower on non-induced plants one...

Life's origins were easier than was thought

...he origin of life: they could not be very large in length as they would not be able to correct the replicati...an 100 different genes, each measuring 70 bases in length (bases are the units that constitute the genes and codify the information), or more than 70 genes, e...

Gradient guides nerve growth down spinal cord

...regulate axon traffic in both directions along the length of the spinal cord." It may also prove a boon to ...nal neurons connect to groups of neurons along the length of spinal cord, some of which reach out of the spinal cord. They pass out of the cord between each p...

Time and money make a difference in endangered species recovery

...d plant and animal status trends and show that the length of time species are protected, and the amount of money spent on their conservation are key variables in explaining trends. Overall, about half of species protected are no longer declining and only 35 % of species protected for 13 years or more were ...

Neanderthal teeth grew no faster than comparable modern humans'

...has become a more-accepted tool for estimating the length of childhood among hominids, the finding is the la...o mature. And that gives them an indication of the length of an individual's childhood. Neanderthals, Homo neanderthalensis, were the dominant hominid inhab...

Hormones and growth: The control of body size and developmental growth rate in fruit flies

...between the final body size of an organism and the length of its developmental stages: Elephants are larger and develop more slowly than mice. However, the mechanisms by which body size and developmental rate are controlled remain incompletely understood. Both studies examine the control of larval developm...

Rodent social behavior encoded in junk DNA

...hat determines when and where a gene turns on. The length of these repeating sequences ?once dismissed as me...distribution of the receptors is determined by the length of the microsatellites." Prairie voles with the long version have more receptors in circuits for so...

IBM Transforms the Art of Scientific Expeditions

...n called HIF-1 after radiation therapy doubled the length of time it took for human cancers to begin growing again in mice, said the radiation biologists from the Duke Comprehensive Cancer Center. Each therapy alone had limited or no benefit on the tumor, because tumors are skilled at circumventing individ...

Duke Experiments Boost Radiation's Cancer-Killing Effects

...n called HIF-1 after radiation therapy doubled the length of time it took for human cancers to begin growing again in mice, said the radiation biologists from the Duke Comprehensive Cancer Center. Each therapy alone had limited or no benefit on the tumor, because tumors are skilled at circumventing individ...

Nanowires can detect molecular signs of cancer, scientists find

...cause each binds its receptor for a characteristic length of time before dislodging. "Our results show that these devices are able to distinguish among molecules with near-perfect selectivity," Lieber says, adding that the risk of false readings is minimized by the incorporation of various control nanowir...

New Lab Research May Help Those Deafened By Immune System Attack

...onsidered patients' other autoimmune diseases, the length and pace of hearing loss progression before treatment, and age and gender. Thirty of the patients were female, and 33 male; their average age was 47, reflecting the young age at which AISNHL typically begins. Twenty-six had lost hearing in both ears...

A novel method to measure circadian cycles

...that their data jibed with the previously accepted length of the human circadian cycle: 24.5 hours. Because of the sensitivity of their method, Schibler and colleagues also confirmed that, for both humans and mice, circadian rhythms vary substantially between individuals. This suggests that the genetics of ...

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