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Tag: "divide" at biology news

Selective marker found to indicate aggressive form of breast cancer

...ructure of adult stem cells as they regenerate and divide into daughter cells. "Normal basal epithelial tissue produces nestin, but basal epithelial tumors produce a tremendous amount of nestin, which likely represents an abnormal expansion of the basal epithelia." DiRenzo said. "If it is indeed specif...

DNA ends: Common tool, different job

...r germ cells or baker's yeast cells, which need to divide indefinitely, an enzyme called telomerase elongates telomeres to compensate for the continual attrition at chromosome ends. At the same time, telomerase activity is the main mechanism by which human tumor cells achieve immortal growth. In addition...

Synthetic peptide targets latent papilloma virus infections

...pes of cells that make up the skin. As these cells divide and differentiate into skin cells, the viruses hitch a ride on the cells' chromosomes but do not become part of the chromosomes, as do other known pathogens, such as HIV in blood cells. The virus can transform infected cells and make them prolifera...

Imaging techniques permit scientists to follow a day -- or four -- in the life of a cell

...n excess of four days), during which the cells may divide multiple times and cycle through nearly all cellular functions. When coupled with the latest in image-analysis software, this technique allows researchers to gain a long-term perspective on events in the lives of cells. ...

Brown cancer biologists identify major player in cell growth

...ABP was disrupted, and the fibroblasts' ability to divide was dramatically reduced. At the same time, other genes known to restart cell division were unchanged. The team confirmed GABP's critical role in cell growth another way. Simply forcing dormant cells to make GABP, they found, was enough to rouse c...

Brain's white matter -- More 'talkative' than once thought

... myelin. The immature cells simply hang around and divide very slowly, waiting to be spurred into action. To learn more about OPCs that reside in the brain’s white matter, the Johns Hopkins researchers measured activity from individual precursor cells in the corpus callosum, a region of white matter tha...

Undergraduate research shows leaderless honeybee organizing

...choices, such as the assessment that it is time to divide the colony and swarm, appear to be decided by the dynamics of the group itself. Social interactions, environmental pressures or group dynamics in some still-unknown way initiate a string of behaviors that effectively manage complex group activities. ...

Loss of stem cells correlates with premature aging in animal study

... specific adult stem cells. These stem cells don’t divide as frequently as other cell types since they need ...e stem cells are needed, their progeny can rapidly divide and are able to replenish the tissue with new cells. Brown explains that in the current study th...

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