Body

In a survey of more than one thousand infertility patients with frozen embryos, 60 percent of patients report that they are likely to donate their embryos to stem cell research, a level of donation that could result in roughly 2000 to 3000 new embryonic stem cell lines.

In August of 2001, less than two dozen embryonic stem cell lines were made eligible for federal research funding. Most scientists now agree that the eligible lines have proven inadequate in number and unsafe for transnational research.

The team of Denis Réale, Professor in the Department of Biological Sciences at Université du Québec à Montréal, recently published some remarkable research findings. Reconstructing the genetic history of a population of mouflons descended from a single pair, the researchers demonstrated that the animals’ genetic diversity increased over time, contrary to what the usual models predict.

These results contradict the belief that a population descended from a small number of individuals will exhibit numerous deficiencies and reduced genetic diversity.

How social or altruistic behavior evolved has been a central and hotly debated question, particularly by those researchers engaged in the study of social insect societies of ants, bees and wasps.

In these groups, this question of what drives altruism also becomes critical to further understanding of how ancestral or primitive social organizations (with hierarchies and dominance fights, and a poorly developed division of labor) evolve to become the more highly sophisticated networks found in some eusocial insect collectives called “superorganisms.”

The significance of pleiotrophin (PTN) expression in breast cancer has not been clearly established but researchers at Scripps sau they have done it in a new study. These new findings could lead to a better understanding of the molecular pathogenesis of breast cancer and focus attention on PTN and its signaling pathway as possible targets for new cancer therapies.

Scientists have long thought that microtubules, part of the microscopic scaffolding that the cell uses to move things around in order to hold its shape and divide, originated from a tiny structure near the nucleus, called the centrosome.

Women cheat on men for their own needs but superb starling females stray from their mates for the sake of their chicks, according to recent Cornell research. This reasoning includes being able to know if mates are too 'genetically similar' for breeding.

That gives 'doing it for the kids' a whole new layer of meaning. The study found that superb starling females (Lamprotornis superbus) cheat on their mates based on these factors:

Researchers say they have discovered the gene that regulates stem cell ability to self-renew and to differentiate into highly specialized types. This means they could program stem cells to become certain cells or do repair automatically.

“You could call this a ‘theory-of-everything’ for stem cells,” said senior author Dr. Michael Rudnicki, Senior Scientist and Professor at the Ottawa Health Research Institute and the University of Ottawa, referring to the often-cited theory of everything for physics.

The obesity epidemic has become a major public health problem in both industrialized countries and the developing world. Recent studies suggest that the major development of persistent adiposity is established already at pre-adolescence.

The fact that obesity is mainly determined before puberty implies that preschool detection of children at risk is essential along with individual prevention programs.

Women who get most of their daily calcium from food have healthier bones than women whose calcium comes mainly from supplemental tablets, say researchers at Washington University School of Medicine in St. Louis. Surprisingly, this is true even though the supplement takers have higher average calcium intake.

Solving one of the biggest problems in commercialization of fuel-cell-powered automobiles is the goal of a new $1.88 million research project on on-board hydrogen storage at the U.S. Department of Energy's Argonne National Laboratory.

To be practical, researchers say, the hydrogen storage system must be able to hold enough of the fuel for a driving range of 300 miles before refilling; no current technology meets this goal within the constraints of allowable weight and volume for passenger cars.