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Physical Properties Predict Stem Cell Outcome

By Guest PostMay 26, 2012Scienceatomic force microscope, bone, bone tissue, brown university, cartilage, eric darling, mesenchymal stem cells, rafael gonzaelz cruz, stiffness, tissue engineer, vera fonseca, viscosity

Tissue engineers can use mesenchymal stem cells derived from fat to make cartilage, bone, or more fat. The best cells to use are ones that are already likely to become the desired tissue. Brown University researchers have discovered that the mechanical properties of the stem cells can foretell what they will become, leading to a potential method of concentrating them for use in healing.

PROVIDENCE, R.I. [Brown University] — To become better healers, tissue engineers need a timely and reliable way to obtain enough raw materials: cells that either already are or can become the tissue they need to build. In a new study, Brown University biomedical engineers show that the stiffness, viscosity, and other mechanical properties of adult stem cells derived from fat, such as liposuction waste, can predict whether they will turn into bone, cartilage, or fat.

That insight could lead to a filter capable of extracting the needed cells from a larger and more diverse tissue sample, said Eric Darling, senior author of the paper published in Proceedings of the National Academy of Sciences. Imagine a surgeon using such a filter to first extract fat from a patient with a bone injury and then to inject a high concentration of bone-making stem cells into the wound site during the same operation. (more…)

Cycling May Negatively Affect Male Reproductive Health, UCLA Study Finds

By Guest PostMay 26, 2012Health, Sportscycling, hormonal imbalances, male athletes, male cyclists, reproductive hormones

A study by researchers at the UCLA School of Nursing has found that serious male cyclists may experience hormonal imbalances that could affect their reproductive health. (more…)

Seagrasses Can Store as Much Carbon as Forests

By Guest PostMay 25, 2012Environmentcarbon stock, climate change, coastal seas, florida coastal everglades, global carbon pool, seagrass beds, seagrass ecosystems, seagrasses

Researchers find that the global carbon pool in seagrass beds is as much as 19.9 billion metric tons

Seagrasses are a vital part of the solution to climate change and, per unit area, seagrass meadows can store up to twice as much carbon as the world’s temperate and tropical forests. (more…)

Religion is a Potent Force for Cooperation and Conflict, Research Shows

By Guest PostMay 25, 2012Politicsbackfire effect, conflict resolution deals, religious conviction, religious rituals, sacred values

ANN ARBOR, Mich.— Across history and cultures, religion increases trust within groups but also may increase conflict with other groups, according to an article in Science. (more…)

Carbon from Martian Meteorites Not Evidence of Life

By Guest PostMay 25, 2012Sciencecarbon on meteorites, evidence of life, future mars missions, life on mars, martian meteorites, modern martian life

The findings provide insight into the chemical processes taking place on Mars and will help aid future quests for evidence of ancient or modern Martian life.

Carbon in some Martian meteorites came from Mars but not from life on Mars, according to new research from an international team that includes a University of Arizona geoscientist. (more…)

Rare Rabbit

By Guest PostMay 24, 2012Naturestriped rabbit, sumatran rabbit, sumatran striped rabbit

UD’s McCarthy part of group that films rare striped rabbit in Sumatra

With cameras set up in Sumatra looking for medium- and small-sized wild cats, such as leopards, a research group involving the University of Delaware’s Kyle McCarthy, found images of something else entirely — a rabbit. Not just any ordinary rabbit, but a Sumatran striped rabbit, one of the world’s rarest species and one that had been captured on film only three times before. (more…)

Not a One-Way Street: Evolution Shapes Environment of Connecticut Lakes

By Guest PostMay 24, 2012Environment, Naturealewife, atlantic coast, bosminia, colonial settlers, colonial times, connecticut, daphnia, david post, ecology, environmental change, evolution, evolutionary change, evolutionary feedback, fish, force, genetic changes, john delong, lake, loop, matthew r walsh, organism, plankton, population growth, predator, prey, torrance hanley, water fleas, yale university, zooplankton

Environmental change is the selective force that preserves adaptive traits in organisms and is a primary driver of evolution. However, it is less well known that evolutionary change in organisms also trigger fundamental changes in the environment.

Yale University researchers found a prime example of this evolutionary feedback loop in a few lakes in Connecticut, where dams built 300 years ago in Colonial times trapped a fish called the alewife.

In a study published May 23 in the journal Proceedings of the Royal Academy B, the Yale team describes how this event fundamentally changed the structure of the alewife and, with it, the water flea that the alewife feeds upon and the food chain that supports them both. (more…)

Criminology and the Global Financial Crisis

By Guest PostMay 24, 2012Economy, Politicscriminal behavior, criminology, financial dealings, global financial crisis, Ponzi Scheme, psychopathic tendencies

The first overt indications of the impending global financial crisis manifested themselves in August 2007, when BNP Paribas announced it was severing ties with three hedge funds specializing in mortgage debt for American real estate properties. The crisis was exacerbated by the immediate freeze on credit by banks to their customers – and to each other. The crisis came to a head in 2008 when the United States government refused to rescue investment firm Lehman Brothers from financial collapse. Subsequent actions by the American government and by foreign governments, as well as actions taken by commercial enterprises world wide, have been focused on repairing the financial damage to sovereign economies and to individuals thrown out of work – and out of their homes. (more…)

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