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Tag: "divide" at biology news

Study Links Ebola Outbreaks To Animal Carcasses

... antelope species), move across the human-wildlife divide through hunters taking either sick animals or carcasses for meat. Hunters can then spread the disease to families and hospital workers, creating the conditions for an epidemic in the process. Between August 2001 and June 2003, researchers noted that...

Combination therapy boosts effectiveness of telomere-directed cancer cell death

...n divide.In contrast to normal cells, cancer cells divide continuously anduncontrollably. Scientists know that cancer cells produce an enzyme,called telomerase, which prevents telomeres from getting too short socells can keep dividing. Telomerase is not used by healthy cells, andhas been identified as a log...

GATA: a graphic alignment tool for comparative sequence analysis

...n divide.In contrast to normal cells, cancer cells divide continuously anduncontrollably. Scientists know that cancer cells produce an enzyme,called telomerase, which prevents telomeres from getting too short socells can keep dividing. Telomerase is not used by healthy cells, andhas been identified as a log...

Needling Chromosomes Reveals Cell Division Secret

... called chromatids, is crucial if the cells are to divide properly. In this process chromatids are drawn apart to separate poles of the dividing cell so that each new "daughter" cell contains a singlecopy of each. The same basic process operates in normal cell division,called mitosis, as well as the prolife...

Circles Of DNA Might Help Predict Success Of Stem Cell Transplantation

...s or other foreign substances stimulate T cells to divide and multiply in order to form an attacking army. H...e sjTRECs don't multiply when the original T cells divide and multiply. Instead, the more T cells that are produced in the blood as the parent cells containin...

Single stem cells from bone heal a broken heart

...man bone marrow–derived stem cells were allowed to divide to form a large population, they were transplanted into a rat model of myocardial infarction. This improved cardiac function because the cells stimulated release of growth factors and anti-apoptotic agents that, in turn, increased the proliferative p...

Same-Sex Mating Discovered in a Toxic Fungus

...ey reported. Meiosis is the process whereby cells divide into two "haploid" cells, each with half the number of chromosomes. Unlike diploid animals and plants, C. neoformans normal state is haploid, Heitman explained. Furthermore, the team showed, strains lacking components required for mating -- includin...

Biochemists report discovery of structure of major piece of telomerase; implications for cancer

...f cancer cells, Feigon said. Because cancer cells divide rapidly, their telomeres should get shorter more quickly than normal cells. However, because cancer cells have high levels of telomerase activity, which rebuilds the telomeres, cancer cells can maintain the length of their telomeres indefinitely. Alt...

Cellular Defects in Premature Aging Disease are Reversible

..., and a few days later it was healthy and ready to divide again," said Misteli. Misteli noted that these results demonstrate a proof-of-principle that the cellular effects of progeria can be reversed, meaning his laboratory's method could be used some day in the future as a therapeutic strategy. The fact t...

Unchecked DNA replication drives earliest steps toward cancer

...hat an initiating genetic error can push a cell to divide relentlessly, leading to conditions of DNA replication stress. This stress leads to random errors in the DNA duplication process ?breaks in the DNA that disrupt genes, for example. Unless halted, this error-generating process leads to an accumulation...

Two chemicals boost immune cells' ability to fight HIV without gene therapy

...turely. The telomerase enabled the immune cells to divide indefinitely, stimulated their production of a vir...re." Immune cells that battle HIV must constantly divide in order to continue performing their protective functions. The massive amount of division premature...

Scientists generate patient-specific stem cells, Science study says

...arthenogenetic origin, where unfertilized eggs can divide on their own. Hwang and colleagues report that the cells are chromosomally normal, self-renewing and "pluripotent" ?meaning they have the ability to form the three major types of cells in the early embryo that give rise to all other cells in the bod...

SuperLigands - a database of ligand structures derived from the Protein Data Bank

...arthenogenetic origin, where unfertilized eggs can divide on their own. Hwang and colleagues report that the cells are chromosomally normal, self-renewing and "pluripotent" ?meaning they have the ability to form the three major types of cells in the early embryo that give rise to all other cells in the bod...

15-year hunt finds cause of pseudothalidomide syndrome

...t lined up properly. As a result, the cell doesn't divide or divides very slowly, and the new cells can end up with too many or too few chromosomes (a problem also seen in cancer cells). In Roberts syndrome, the cells tend to stop growing or die, precluding proper development of the limbs, palate and other ...

Pair of cancer genes found to drive both cell migration and division

...s. "In cancer, you sometimes see cells failing to divide or undergoing unequal divisions. In addition, cell...s that human cells likely use the new mechanism to divide as well. The next steps are to study the roles of the two genes in dividing cells by seeing if cont...

Newly discovered protein an important tool for sleeping sickness research

...domly switch to another antigen when the organisms divide and reproduce. Trypanosomes whose VSG has switched evade the antibodies the human immune system made to fight the original antigen, thus assuring the long-term survival of these parasites within their hosts. The trypanosome has approximately 1,000 di...

Breakthrough System for Understanding Ocean Plant Life Announced

...domly switch to another antigen when the organisms divide and reproduce. Trypanosomes whose VSG has switched evade the antibodies the human immune system made to fight the original antigen, thus assuring the long-term survival of these parasites within their hosts. The trypanosome has approximately 1,000 di...

Researchers pioneer new gene therapy technique using natural repair process

...ed selective advantage; the healthy cells grow and divide preferentially over the mutant ones." Previous gene therapy attempts for SCID have been only moderately successful because of technical difficulties in the delivery method. In one instance, the correct IL-2R gene was delivered to mutant cells of SCI...

U of T researchers map role of Epstein-Barr virus in cancer

...keeps the p53 levels low so cells will continue to divide when they shouldn't, which means they're now more likely to develop into cancer," Frappier says. "All viruses known to be able to cause cancer, like the human papillomavirus that causes cervical cancer for example, have been shown to work through th...

Scientists succeed in cloning human embryos from eggs matured in the lab

...e two-cell stage, and of these, three continued to divide to the six- to ten-cell stage. One embryo continued to develop to the compacted stage, when the individual cells started to flatten and increase their contact with one another. Mr Heindryckx said: "To our knowledge, this is the first report describi...

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