Daily Archives: August 12, 2010

Why are some urinary tract infections chronic?

ResearchBlogging.orgChronic infection is, in a way, the new emerging infectious disease. Many pathogens are relatively tenacious when they infect elderly individuals or individuals who are otherwise not fully immunocompetent, and such individuals are, thanks to modern medical technology and practice, more common in the population. Resistant bacteria can cause chronic infection. It is interesting to see more research oriented specifically towards the problem of chronic infection as a problem in and of itself, and a paper just out by Hannan, Mysorekar, Hung, Isaacson-Schmit and Hultgren, in PLoS Pathogens, is an interesting and important example of one such research project.
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What I know about Marc Hauser, the recently ‘investigated’ Harvard primatologist

I know Marc Hauser, and I trust him. I worked with him for a few years as a colleague on the faculty in the Anthropology department on various administrative matters (such as graduate admission and undergraduate program development) and we taught together. We are very different kinds of people, and did not always see eye to eye (well, we disagreed on one thing, once), but the same can be said of almost any two people from those days and that department, to some degree.
Continue reading What I know about Marc Hauser, the recently ‘investigated’ Harvard primatologist

Galaxies Can Return From the Dead

Did you know that galaxies can die? They are apparently declared dead by astronomers when they stop making new stars. But a recent finding suggests that this kind of death is not the end of the road for at least some galaxies.

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Astronomers have found mysterious, giant loops of ultraviolet light in aged, massive galaxies, which seem to have a second lease on life. Somehow these “over-the-hill galaxies” have been infused with fresh gas to form new stars that power these truly gargantuan rings, some of which could encircle several Milky Way galaxies.

The discovery of these rings implies that bloated galaxies presumed “dead” and devoid of star-making can be reignited with star birth, and that galaxy evolution does not proceed straight from the cradle to the grave.

“In a galaxy’s lifetime, it must make the transition from an active, star-forming galaxy to a quiescent galaxy that does not form stars,” said Samir Salim, lead author of a recent study and a research scientist in the department of astronomy at Indiana University, Bloomington. “But it is possible this process goes the other way, too, and that old galaxies can be rejuvenated.”

Read the rest here.