Tag: "shaft" at biology news

University of Colorado archaeologist, colleagues hot on the trail of ancient Persian warships

...s and a bronze spear point with part of the wooden shaft still intact into the entrance of its home. "Happi... It served as a counterweight and also allowed the shaft to be stuck in the ground when in was not in use. "It could be used as a weapon of last resort if t...

Standard helps control quality of joint replacements

...ene used to make the socket for the metal ball and shaft in an artificial hip. This "crosslinking" creates a structure that resists sliding forces and wear. Manufacturers and researchers need to control radiation conditions to achieve the intended wear resistance; too much radiation causes brittleness, and...

How lice and bird feathers stick together

...arbs" the hair-like branches that extend from the shaft of each feather. When lice can hide in the feathers, the birds cannot preen them off with their beaks. Why should anyone care? More than half of all species on Earth are parasites, or bacteria and viruses that act like parasites. The great diversity...

Splitting hairs: GATA-3 function in hair follicle development

... channel, functioning to guide the developing hair shaft up to the skin surface. Without the channel, the hair does not develop properly," explains professor Fuchs. In an effort to understand how cells are directed towards an IRS fate, Dr. Fuchs and two MD/PhD students, Charles Kaufman and Diana Bolotin, ...

Development of hair depends on development of the hair channel

... follicles The hair follicle consists of the hair shaft -- what we shampoo and comb daily -- and, embedded...thin the skin, a rigid channel that holds the hair shaft called the Inner Root Sheath (IRS). Scientists believe that the main purpose of this channel is to s...

Gene newly identified by Columbia researchers may improve hair removal

...e as it marches alongside the others when the hair shaft is formed. This way, each cell receives the right signals to become the right type of hair cell. This protein is like the Velcro that holds the cells together. If they dont stick together properly, they become disconnected from their neighbors and...

Scientists discover 'drive shaft' in mechanism that propels parasite into cells

...duce energy from sugars, serves as a kind of drive shaft in the parasite Toxoplasma as it propels itself into host cells to cause infection. The study appears in the April issue of the journal Molecular Cell. "These findings reveal an important new detail about the molecular mechanism Toxoplasma uses to pe...

Chicago researchers find why uncircumcised men have more HIV

...ethral mucosa or through disruptions of the penile shaft epithelia caused by genital ulcer disease or trauma," he said. In uncircumcised men, Patterson said that the thin keratin layer they found on the inner compared to the outer mucosal surface predisposed the foreskin to infection. The authors mention ...

Feathers on reptile older than dinosaurs, reported in Science

...led "pinnae" project from either side. Neither the shaft nor the pinnae are typically thought to be features of reptilian scales. The shaft also comes to a point at the base and appears to poke into a follicle in the skin. In contrast, mode...

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