BIOLOGY
This is my student page. Enjoy!!!



Anti-Ageing Water???
I know...sounds crazy. Biochemistry is awesome. But this video is really interesting, and this guy just might be onto something. The guy who came up with this whole idea's name is Mikhail Shchepinov... He's a Russian scientist. The guy in the video talks about the isotope effect and Mikhail Shchepinov's theory on how to prevent ageing...
One of the accepted explanations for ageing among the scientific community is the free-radical theory. This theory says that irreversible damage to the biomolecules that make up our bodies is what causes us to age. The main destroyers that cause this damage are oxygen-free radicals, or aggressive chemical compounds that are an unavoidable by-product of metabolism.
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Picture URL: http://www.newscientist.com/data/images/archive/2684/26841801.jpg
Oxygen radicals are so dangerous because they chew up electrons like crazy and leave a trail of destruction wherever they go -- broken chemical bonds. This damage builds up over a lifetime and eventually causes the body's basic biochemical processes to fail. Carbon-hydrogen bonds in protien are especially vulnerable and damage to these bonds has been linked to many old-age diseases, including Parkinson's, Alzheimer's, cancer, chronic renal failure and diabetes. The human body produces antioxidants and exzymes as a defence to these attacks, but over time these defence systems fall victim to oxidative attack too, leading inevitably to death. Many anti-ageing medications are based on supplementing the body's own defences with antioxidant compunds like vitamin C and beta-carotene, but there hasn't been much proof of these working yet. This guy says there's a better way to fight ageing -- instead of supplementing our doomed natural defence systems, make the bonds harder for the free radicals to break. That's the whole point behind this entire "heavy-water" thing. The basic concept of the isotope effect is that the presence of heavy isotopes in a molecule can slow down it's chemical reactions. This is because heavy isotopes form stronger covalent bonds than their lighter counterparts; for example, a carbon-deuterium bond is stronger than a carbon-hydrogen bond. It's not in the markets now because it's slightly controversial -- at 35% heavy water, your entire body chemistry would be so messed up you would die. But, of the 20 amino acids humans use 10 cannot be made by our bodies and have to be present in our diets. SO...they're looking at pre-re-enforcing the vulnerable bonds in our food via feeding it to the animals we eat to prevent ageing somewhere down the road. So.. I tried to sum it up here because the article is really really long.. but it's really interesting if you have a few minutes to sit and read it all. The picture up there might help clarify things a bit too, hopefully. Click here to go to the site... Definitely watch the video below though, it's really interesting.
And there really is more cool stuff at newscientist.com!!!



Lawton, Graham (2008, November 27). Would eating heavy atoms lengthen our lives. Retrieved December 2, 2008, from NewScientist Health Web site: http://www.newscientist.com/article/mg20026841.800-would-eating-heavy-atoms-lengthen-our-lives.html?full=true




Protists (UNIT TEST) -->
I found this websitewhen I was looking for something about protists, it's awesome. It's about protozoa only and it's nothing the textbook doesn't cover, but it kind of sums everything up into a really big web page. Just something to help study if you're up for reading a bit...

Dey, Dr. D. Protozoa. Retrieved November 4, 2008, from Dr. Dennis Dey's Website Web site: http://www.mumstudents.org/~ddey/1protozoa.html


New Speciesexternal image dn14755-1_250.jpg

Scientists have recently discovered hundreds of new species of animals off the north-western coast of Australia, in the Great Barrier Reef. They're mostly either soft coral species or small crustaceans. This one is called a Dendronephthya, but there's a slide show on this website with a few other pictures. All of these species were previously unknown, which is crazy. It makes me wonder how much else we don't know. They look so surreal though.. some of the new species they found are amazing. It's a really short slide show, definitly worth watching. The animals that live in the ocean are so beautiful. Click here.

Marshall, Michael (2008, September 19). Reef search turns up hundreds of new species. Retrieved November 2, 2008, from NewScientist Web site: http://www.newscientist.com/channel/life/dn14755-reef-search-turns-up-hundreds-of-new-species.html


Life in outer space...?? CLICK THESE WORDS

Recently, scientists have discovered a bacterium that lives 2.8km beneath the surface of the Earth, in a gold mine in South-Africa. They nicknamed it the goldmine bug but it's official name is Candidatus Desulforudis audaxviator. It lives in absolute isolation from any other living organism, which has astrobiologists going crazy. This organism is one-hundred percent self sufficient. They say this is the type of bacterium which would survive in the harsh environments of outer space, it can survive without help of any other living organisms and it doesn't use the sun or any of the byproducts of photosynthesis. The fact that the communities of this bacterium that the scientists discovered and did tests on contained only one single species "stands one of the most basic tenets of microbial biology on it's head". It's an obligately anaerobic species and analysis has shown that the bacterium gets its energy from the radioactive decay of uranium in the surrounding rocks. It forms endospores to protect itself, it has a flagellum to help it navigate, it has genes which can extract carbon and fix nitrogen -- this bacterium is entirely independent of the rest of the world. This is living proof that everything necessary to sustain life can be packed into a single genome. Click here to read all about it.. it's sooooo cool. I also found this website which is all about archaeabacteria. They are so interesting.. seriously. They are definitly my favorite. I think there are bacteria on other planets for sure.. we just don't know it yet. But defiintly read this, it's not very long.. it's worth two minutes. CLICK CLICK CLICK CLICK CLICK HERE

Brahic, Catherine (2008, October 9). Goldmine bug DNA may be key to alien life. Retrieved October 29, 2008, from NewScientist Environment Web site: http://environment.newscientist.com/channel/earth/dn14906-goldmine-bug-dna-may-be-key-to-alien-life.html?feedId=online-news_rss20

Davison, Anna (2008, June 26). The most extreme life-forms in the universe. Retrieved October 29, 2008, from NewScientist Space Web site: http://space.newscientist.com/article/dn14208-the-most-extreme-lifeforms-in-the-universe.html



This is a link about dissecting eyes...cows eyes anyway. I know it sounds kind of gross but it's got a lot of information
about how our eyes work and why we see the way that we do. There are videos of the girl actually dissecting an eye.
Some of them remind me a little too much of the movie hostel, but if you're not too easily grossed out it's really pretty
interesting: click here to watch and learn.


Murphy, Pat 2005. Cow's eye dissection. Retrieved September 18, 2008, from Exploratorium Web site: http://www.exploratorium.edu/learning_studio/cow_eye/index.html


DID YOU KNOW?? That the average person encouters 18 scientific claims a day.. but you can't believe
everything you read. There are a few questions you should ask yourself next time you read a headline that makes
a claim that doesn't quite sound beleivable. This links to the website I found.

Gordan and Betty Moore Foundation. Evidence: How do we know what we know?. Retrieved September 18, 2008, from Exploratorium Web site: http://www.exploratorium.edu/evidence/index.htm

Anyone confused??
Soo..cells. Anybody else not remember anything from grade 9..?? Well.. this video I found
is pretty funny. And it kind of jogged my memory after doing nothing science-related at all
for almost a year:




swbe (2007, November 25). Anatomy of a cell. Retrieved September 22, 2008, from Youtube Web site: http://www.youtube.com/watch?v=--NXZCX9VPA


Little ecosystems on our skin
Bacteria is EVERYWHERE.. and over 60% of the biosphere by weight is
bacteria. That's a lot of prokaryotes. This video is pretty cool.. it's all about
the different bacteria that live on our skin. Did you know that there is more
of a difference between e.coli and bacillus than there is between us humans
and corn? Thanks by the way to Mrs. Holyoke Walsh for the site!!


Lichtman, Flora (2007, October 18). Life on our skin. Retrieved September 23, 2008, from Science friday Web site: http://www.sciencefriday.com/videos/watch/10043

DEAL or no deal??!
It's actually called grade or no grade.. but it's the same idea. Except it's got questions about cells and all that
kind of stuff we're learning about now. The instuctions are pretty straightforward. So, this sentence is the link.
The website I got it from has tons of other science review games too. Click here.

Mr. Sheehan, (2006, November 13). Cell organelles: grade or no grade?. Retrieved October 1, 2008, from Biology Review Games Web site: http://www.sciencereviewgames.com/srg/games/gong.php?id=92
Science review games (2006-2008). Biology games. Retrieved October 1, 2008, from Science Rewiew Games Web site: http://www.sciencereviewgames.com/srg/subjects/bio.php




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