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Worker or queen? Harvester ant moms set daughters' fates
02-14-2008 · EurekAlert!When it comes to deciding what harvester ant daughters will be when they grow up, mother queens hold considerable sway, according to a new study...
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Keywords: worker, queen, harvester, ant, moms, set, daughters, fates, mom, daughter, fate
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- Wood ant queen has no egg-laying monopoly
06-27-2007 · EurekAlert!
Insect queens were thought to have an egg-laying monopoly, but nine wood ant species revealed widespread reproductive activity by worker ants. Genetic analysis showed that as many as one in four eggs were laid by workers. Workers in many insect species can lay unfertilized male eggs, but usually workers in large colonies enforce the exclusive reproduction of the queen.
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- Stem cells determine their daughters' fate
02-15-2007 · EurekAlert!
From roundworm to human, most cells in an animal's body ultimately come from stem cells. When one of these versatile, unspecialized cells divides, the resulting "daughter" cell receives instructions to differentiate into a specific cell type. In some cases this signal comes from other cells. But now, for the first time, researchers at the Carnegie Institution's Department of Embryology have found a type of stem cell that directly determines the fate of its daughters.
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- Mom's obesity during conception phase may set the stage for offspring's obesity risk
01-03-2008 · EurekAlert!
Researchers have examined whether fetal exposure to gestational obesity leads to a self-reinforcing viscious cycle of excessive weight gain and body fat which passes from mother to child. The results of a new study suggest they do.
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- St. Jude study yields secrets of chromosome movement
06-14-2007 · EurekAlert!
Investigators at St. Jude Children's Research Hospital have used the lowly yeast to gain insights into how a dividing human cell ensures that an identical set of chromosomes gets passed on to each new daughter cell.
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- The bee that would be queen
06-05-2007 · EurekAlert!
A team of researchers from Arizona State University, Purdue University and the Norwegian University of Life Sciences has discovered evidence that honeybees have adopted a phylogenetically old molecular cascade -- TOR (target of rapamycin), linked to nutrient and energy sensing -- and put it to use in caste development. They found that queen-fate can be blocked, and that workers develop, when TOR activity is reduced during development.
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- Hip size of mothers linked to breast cancer in daughters
10-08-2007 · EurekAlert!
In a study of the maternity records of more than 6,000 women, David J.P. Barker, M.D., Ph.D., and Kent Thornburg, Ph.D., of Oregon Health & Science University discovered a strong correlation between the size and shape of a woman's hips and her daughter's risk of breast cancer. Wide, round hips, the researchers postulated, represent markers of high sex hormone concentrations in the mother, which increase her daughter's vulnerability to breast cancer.
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- Old developmental pathways spawn revolutionary evolutionary changes
09-06-2007 · EurekAlert!
When the larvae of the primitive social insect Polistes metricus, a paper wasp, slips into the quiet pupal stage, she doesn't know if she'll arise a worker or gyne (future queen) -- unless she consults with Arizona State University's social insect researcher Gro Amdam. Amdam's group is shedding new light on the development of colonial insects from solitary ancestors through study of a primitive social order of wasps.
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- Undergraduate research shows leaderless honeybee organizing
06-11-2007 · EurekAlert!
A new finding by an undergraduate scientist and a senior bee researcher gives new insight on the organization of honeybee colonies, which exhibit behavior rivaling human cultures in social complexity. The study reveals that major colony management activities are directed anonymously by hive workers using a nonspecific signal that modulates worker and queen behavior, and may have implications important for understanding other complex phenomena, from brain activity to terrorist networks.
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- Making daughters different -- How immune cells take divergent paths when fighting infections
03-01-2007 · EurekAlert!
How do immune cells decide to respond to invading microbes by either fighting to the death or becoming the body's memory for future infections? Researchers at the University of Pennsylvania School of Medicine have discovered that immune cells can differ in their inheritance of molecules that regulate cell fate, and therefore what role they play in fighting infection.
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- New insights into the fate of antiparasitics in manure and manured soils
12-04-2007 · EurekAlert!
The so far available data set on fate and behavior of veterinary medicinal products in manure and manured soils has now significantly been enhanced by a team of researchers around Robert Kreuzig, Braunschweig University of Technology, Institute of Ecological Chemistry and Waste Analysis, Germany. The scientists investigated the fate and behavior of benzimidazole antiparasitics in manure and manured soils under laboratory as well as under field conditions.
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