Category Archives: biology

Scientists battle malaria using toxic nectar

Yesterday’s New York Times reports a series of studies, funded by the Bill and Melinda Gates Foundation, aimed at eradicating malaria (one report has appeared in Malaria Journal; the reference is given below and you can download the paper by clicking the link at the NYT). The idea is a clever one: female mosquitoes, who are […]

Stephen Jay Gould

Today will be an orgy of remembrance of the events of ten years ago; even at 5 a.m. the television was full of the stuff.  I have nothing to contribute to what’s already been said, so I just want to remember another anniversary that took place yesterday: what would have been the 70th birthday of […]

How many species? I’m still not sure.

by Greg Mayer Jerry recently discussed an article in Plos Biology which tried to estimate the number of species on Earth by extrapolating from more or less known relationships between higher and lower level taxonomic diversity. Carl Zimmer has a piece in today’s Science Times, and records some dissent from the method used: But Terry […]

How many species are there on Earth?

The short answer:  about 9 million, not counting bacteria. That’s according to a new paper in PLoS Biology by Camilo Mora et al. (see also the perspective by Robert May in the same issue; both paper and perspective are free, and you should definitely read Bob’s one-page piece). The issue of how many species inhabit […]

Can species arise in a small space?

One of the big controversies in the study of speciation involves the spatial scale of the process.  Can an ancestral species split into two descendants within a single small area (“sympatric speciation”), or do populations have to be geographically isolated before they can evolve into new species (“allopatric speciation”)?  Clearly the formation of new species […]

A buttload of “blogs”

In case you didn’t know, Scientific American has just started a whole herd of “blogs”—39 of them—and you can find the list here.   There are some old favorites, some new ones, and even some group websites.  If you’ve followed these “blogs” in their previous incarnation, feel free to list your favorites below. I’d like to […]

The biology of Mauritius: part 2

Yesterday I presented some photographs and descriptions by biologist Dennis Hansen of his work on the isolated island of Mauritius.  That only scratched the surface of the amazing biology of the endemic species on this island, and I want to finish up this brief lesson with some more show-and-tell. Dennis also sent me an reallly […]

A strong critique of the “arsenic paper”

I’ve rarely seen a critique this strong in the reviewed scientific literature.  It’s about Wolfe-Simon et al.’s paper in Science suggesting that a bacterium could incorporate arsenic instead of phosphorus in DNA and biomolecules.  Simon Silver and and Le T. Phung take strong issue with this in a piece in the “current controversies” section of […]

R.I.P. Rosalyn Yalow

Today’s New York Times reports the death, at 89, of Rosalyn Yalow, the second woman to win the Nobel Prize for Medicine and Physiology. (Yalow won in 1977; the first, Gerty Cori, got hers thirty years earlier. There have been eight female winners since Yalow).  If you want to see how much tougher it was […]

The second most beautiful experiment in biology

Insofar as I have any “philosophy” about how I do my work, it’s this: keep experiments simple.  I’ve always tried to do experiments sufficiently uncomplicated and easy to understand that the results—one way or the other—would be clear-cut enough to not require (or barely require) statistical analysis.  I’ve taught my students this notion, too, and […]

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