Word: miceli
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...Alaska, salmon populations are at risk as melting permafrost pours mud into rivers, burying the gravel the fish need for spawning. Small animals such as bushy-tailed wood rats, alpine chipmunks and pińon mice are being chased upslope by rising temperatures, following the path of the fleeing trees. And with sea ice vanishing, polar bears--prodigious swimmers but not inexhaustible ones--are starting to turn up drowned. "There will be no polar ice by 2060," says Larry Schweiger, president of the National Wildlife Federation. "Somewhere along that path, the polar bear drops...
...Harvard Medical School, found that in embryonic brain cells where healthy prion concentration was high, there was an increase in the proliferation of the brain cells. Researchers tested the levels of healthy prions—abbreviated as Prp(c)s—on the embryonic brain tissue of mice both with and without Prp(c) genes, along with mice that overexpressed the gene. The mice that overexpressed the gene had markedly increased amounts of proliferating cells, while those that lacked the Prp(c) gene had lower amounts of cell formation, yet grew into normal adults. Lindquist said this indicates healthy...
Kathleen E. Breeden ’09 is a prospective history and literature concentrator in Hollis Hall, where she’s petitioned for a resident cat to assist in the ongoing war against mice. This Kentuckian enjoys making tea, building shrines to C.S. Lewis, and pulling all-nighters in Lamont. She swears she won’t procrastinate on drawing submissions, though, so you can look for her cartoon on Thursdays...
...that distinguishes people with high brain reserve from those with low brain reserve. I think that's been part of the problem: we've been looking for a magic bullet." Instead, Valenzuela postulates that mental activity alters the central nervous system in different ways at various levels. Research on mice, he says, shows that a highly stimulating environment increases both the production of new brain and nerve cells and the density of blood vessels around them. A few years ago, Valenzuela headed a project in which a group of elderly Sydney residents had their brains analyzed before and after five...
...higher pH environment of the female cervix. Activated CatSper allow calcium ions to flow into the sperm’s tail. The calcium influx, measurable as an electrical current, alters the way the flagella bends and hyper-activates the tail’s motor proteins. In experiments, mice altered to lack the CatSper protein had weak swimming sperm and were infertile...