Friday, February 2, 2007

Sunlight, DNA Mutation, And My Face Melting Off

Man, I hate sunburns. My paternal grandmother was deathly afraid of sun damage, skin cancer in particular, so much so that she often carried an umbrella (she called it a parasol) outside with her, even just to sit in the yard for a few minutes. Interestingly, her fears came true. She developed a few skin polyps on her nose in her last years, despite all the umbrella-toting.

My grandmother's umbrella came screaming back to my consciousness a few years ago when I burned my face off. I went downhill skiing the first (and only) time – and didn't bring sunblock. "No problem," I thought, "I'll just be here a couple hours." Oh, woe is me! How very naïve I was of the dangers of high-altitude UV radiation and snow reflection! I was there for several hours more than I thought I would be, enjoying a newfound excitement of speeding down snowy hillsides, avoiding other skiers, and tumbling onto my butt and through the air in exotic poses of flailing arms, skis, and ski poles. Great fun. I'll do it again some day.

The next morning I noticed a strange moisture seeping out of my cheeks. It was clear liquid. Was I sweating? I didn't know what to think of it, so I taped some gauze on my cheek and went to work anyhow. Once at work, I busied myself as usual. After an hour or so I noticed the gauze was soaked, so I went to the bathroom to re-evaluate my strange condition. When I took the tape off, part of my cheek went with it! And, boy, did the liquid start coming out! I was positively dripping!

Long story short, I rushed to a medical clinic (and sat for hours in their stupid waiting room) and found out I had a second-degree sunburn. The top layer of skin hadn't bothered turning red first, it just said, "Goodbye cruel sunlit world" and died. My pasty face melted off over the course of about a week. "Peeled off" would be too kind of a phrase. I didn't have enough leave time left at work, so I had to work during that time, my face covered with bandages. Not a good situation. Needless to say, I wasn't very popular with coworkers. The thought running through my mind that whole time was, "Am I going to get skin cancer from this rather severe amount of UV radiation?"

Well, researchers at Ohio State University and their colleagues in Germany have now been able to directly observe UV radiation mutating DNA:

It's reported in the latest addition of _Science_:

It's been known for a long time that exposure to UV light (like in sunlight) can cause skin cancer because the energy level from the intense UV radiation causes mutations in the DNA, leading to uncontrolled cell growth (cancer) or cell death (in the case of a sunburn or, more extreme, your friggin' face melting off!). Femptosecond transient absorption spectroscopy is a very new method for visualizing extremely fast reactions at the molecular level. In short, this method uses lasers to excite molecules and an extremely fast light pulse and detector are used to look at changes in the energy levels of the molecule changed by the laser. Using this method, the researchers directly observed how UV radiation caused the formation of two chemical bonds between thymine molecules in the DNA structure. This was a pretty artificial test sample (artificial thymine-only DNA), and not in actual cells, and didn't involve all the chemical pathways involved with sunburn, but it DOES show for the first time actual DNA mutation from UV radiation, which is a huge step in understanding such mutations.

The authors probably don't go so far, but I'm wondering, could similar, non-deadly mutations happen that could lead to genetic changes in the morphology of bacteria or simple-celled organisms, perhaps even changes that could lead to development of new species adaptations, leading toward evolution?

Anyhow, this all makes me even more concerned about skin cancer and my little bout with my skiing incident!


Anonymous said...

Have you heard about this story of the US Army testing of a new weapon that shoots a microwave beam at a potentially hostile crowd to disperse them? Tinfoil shields?

Angry Lab Rat said...

Yes. They are using the technology right now to protect the "Green Zone" in Iraq. I heard a report that the microwave weapon was being used on suspected "unfriendlies" who are thought to be driving too close to the zone to spy on it. When targeted, the drivers of the unfriendly vehicles are targeted, creating a painful heat on their faces until they leave the area.

Anonymous said...


מלון [url=]כפר בעיר[/url] - אינטימיות, [url=]שקט[/url] . אנו מספקים שירותי אירוח מיוחדים כמו כן ישנו במקום שירות חדרים המכיל [url=]אחרוחות רומנטיות[/url] במחירים מיוחדים אשר יוגשו ישירות לחדרכם!

לפרטים אנא גשו לאתר האינטרנט שלנו - [url=]כפר בעיר[/url] [url=][img][/img][/url]

Anonymous said...

Hello everyone! Who knows where to upload the film Avatar?
I even bought the film Avatar for a SMS to , the link was, but download fails, the system will boot quite strange cocoa something.
Men, advise where to normal as quickly download film avatar?

Anonymous said...

Nice fill someone in on and this post helped me alot in my college assignement. Say thank you you seeking your information.

Anonymous said...

Easily I agree but I think the list inform should have more info then it has.

Anonymous said...

I sell a boat-program which will help you to outwit auction and to win, initially the boat was created for the Scandinavian auction but now the program can work with similar auctions: gagen ru, vezetmne ru and with ten.
The program-boat stakes for you, i.e. for this purpose it is not necessary to sit constantly at the monitor. The boat can set time when it is necessary to stake, thus you as much as possible will lower expenses for rates, and as much as possible increase the chances of a victory.

The price of the program a boat for the Scandinavian auctions 20$

For the first 10 clients the price 15$

To all clients free updating and support.

Behind purchases I ask in icq: 588889590 Max.

Anonymous said...

[b]Set software LoveBots v 5.2[/b]

All for a mass mailing dating

The script is written in php5


[i]registration, account activation
manual input captures, or the solution through antikapchu
filling data accounts:
- Gulf desired photo
- Инфы about yourself
- Diary
- Sexual preference[/i]

gulyalka on questionnaires spammer on lichku
- Randomization Posts: replacement of Russian letters in Latin analogues

optimized to work in a continuous loop
check-activation-filling-spam check ..

Updates and support free of charge.

Price per set 100 wmz

For the first 10 buyers price 70 wmz (your feedback on the software).

For shopping I ask in icq: 588889590 Max.

Scrin program:




Flooding in the subject no! Write to feedback after the purchase.