Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!

 



Forgot your password?
typodupeerror

Comment Re:"Research Papers" (Score 1) 1766

You are correct to say that IF we cannot provide hypotheses explaining how these proteins managed to aggregate and form the structure of a flagella we cannot prove evolution.

But, if one argues that our current state of knowledge provides no explanation for the evolution of the flagella, I would say they lack imagination.

Here's a hypothesis:

If the flagella began as a protein export mechanism, it could have evolved into the Type III secretion system and then into a flagella.

Further speculation:
The motor of this proposed protein export mechanism could have started out as a simple pore complex geared towards protein export. Mutations cause some of these exported proteins to adhere to extracellular portions of this export mechanism, forming the tube like structure of the Type III needle. Over time, mutations alter the structure slightly, without harming the function of this apparatus in protein export, causing it to resemble flagella more and more. Without selection pressure against these developments, these changes persist. In fact, genetic drift may cause these changes to become fixed in a population. Gradually, even more changes occur contributing to the drive motor, resulting in the flagella you see today.

Granted, all of the above is merely a story, but that's not to say that it isn't true. I don't think this scenario is that far fetched, and further study of the flagella may even validate it.

At this point I'd like to point out that it could be interesting to look at research into the specific events occurring during flagella assembly; if you think about it, the flagella IS assembled piece by piece. One would think that flagella intermediates would resemble intermediates in flagella evolution. By studying these "assembly line intermediates", function could possibly be derived (my old biology teacher's mantra: form gives function), further answering the question of flagella development.
Hardware Hacking

Submission + - Great Mac Mod Challenge 2007 (macmod.com)

Jacob Thomason writes: "(August 1, 2007) — MacMod.com, a recognized internet source for free technical news and advice on the latest techniques and products for upgrading and modifying Apple products, today announced the rules and entry requirements for "The Great Mac Mod Challenge 2007" an annual competition in which Apple technology owners are recognized in various categories for their creativity and ingenuity in the upgrades and modifications made to their systems to improve performance, appearance, and functionality. Coinciding with the contest, which begins taking entries August 1st, the month of August has been designated "Modify Your Mac Month."

The event attracts some of the most talented and enthusiastic Mac users around the world and each year the modifications raise the bar higher. Memorable winners of challenges past include the Falcon Mac Mini, Necronomicon G4, the iTablet, a wooden iPod, and the M3 robotic Mini.

"The ingenuity of the modding community never ceases to amaze me," says Anthony King, Director of Marketing and co-founder of MacMod.com. "Every year I think we've done it all, but every year the modifications get more and more elaborate."

"Modders" may submit as many mods as they like. Modification categories include Internal Changes, External Changes, iPod & iPhone Modifications, Peripheral Modifications (Apple TV, Airport, etc.), Software Mods and Hacks, and Miscellaneous Modifications. Entries are judged on their level of difficulty, creativity, integration, and functionality.

In the spirit of fun, the panel of judges will also name "Best Dressed," "Class Clown," "Biggest Geek," and "Most Likely to end up on eBay."

This year's competition will feature major prizes for the top 3 designs plus participation gifts for all the modders. While some prizes are still being planned, the first place mod will be showcased at MacWorld Expo 2008, receive the Mod of The Year trophy, a MacMod.com Tee, a roundtrip ticket to MacWorld Expo 2008*, and an All-Access Super Pass to MacWorld Expo 2008 including PRIORITY KEYNOTE SEATING!"

Slashdot Top Deals

A conclusion is simply the place where someone got tired of thinking.

Working...