Nature's Children

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Mark
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Re: Nature's Children

Post by Mark » Tue Jan 10, 2012 12:24 am

RARE: See what we stand to lose.
http://www.youtube.com/watch?v=jPzZ__JdlYk
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Mark
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Re: Nature's Children

Post by Mark » Tue Jan 10, 2012 3:24 pm

•Collagen is piezoelectric.
"When a force is applied to [bone] collagen, a small dc electric potential is generated. The collagen conducts current mainly by negative charges. Mineral crystals of the bone (apatite) close to the collagen conduct current by positive charges. At a junction of these two types of semiconductors, current flows easily in one direction but not in the other direction …. It is thought that the forces on bones produce potentials by the piezoelectric effect and that the junctions of collagen-apatite, currents are produced that induce and control bone growth. The currents are proportional to stress (force per unit area), so increased mechanical bone stress results in increased growth." Physics of the Body (255).
http://physics.info/dielectrics/

Collagen is a composed of a triple helix, which generally consists of two identical chains (α1) and an additional chain that differs slightly in its chemical composition (α2).[23] The amino acid composition of collagen is atypical for proteins, particularly with respect to its high hydroxyproline content. The most common motifs in the amino acid sequence of collagen are Glycine-Proline-X and Glycine-X-Hydroxyproline, where X is any amino acid other than glycine, proline or hydroxyproline. The average amino acid composition for fish and mammal skin is given.[23]
http://en.wikipedia.org/wiki/Collagen

http://en.wikipedia.org/wiki/Apatite

http://en.wikipedia.org/wiki/Spaceflight_osteopenia
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Mark
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Re: Nature's Children

Post by Mark » Sun Jan 22, 2012 6:56 am

Rolling Salamanders & Caterpillars - Weird Nature - BBC animals
http://www.youtube.com/watch?v=HmLS2WXZQxU
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Re: Nature's Children

Post by Mark » Mon Jan 23, 2012 7:23 pm

16 Of The Smartest Children In History
http://www.businessinsider.com/child-pr ... 011-5?op=1
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Re: Nature's Children

Post by Mark » Sat Jan 28, 2012 2:09 am

Doodling in Math: Spirals, Fibonacci, and Being a Plant [1 of 3]
http://www.youtube.com/watch?v=ahXIMUkS ... e=youtu.be
Part 2: http://youtu.be/lOIP_Z_-0Hs

Interesting about the magnet experiment
Part 3: http://youtu.be/14-NdQwKz9w
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Mark
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Re: Nature's Children

Post by Mark » Wed Feb 08, 2012 4:10 pm

The only primate to communicate in pure ultrasound
http://www.newscientist.com/article/dn2 ... sound.html

One of my dogs came running in the room when I played this, perhaps 15 seconds into it or so.
http://www.tarsier.org/media_audio.html

Tarsiers Communicate in Secret Speech
http://news.sciencemag.org/sciencenow/2 ... tml?ref=hp
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Re: Nature's Children

Post by Mark » Wed Feb 08, 2012 6:41 pm

Chimp solves memory test 'faster than blink of an eye'
http://www.bbc.co.uk/nature/16832379
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Re: Nature's Children

Post by Mark » Wed Feb 15, 2012 2:33 am

"Adult males of the B. micra species grow to only just over a half-inch (16 millimeters) from nose to bottom, making them one of the smallest vertebrates ever found on Earth. From nose to tail, adults of both sexes grow to only 1 inch (30 mm) in length."

World's Tiniest Chameleon Discovered
http://www.livescience.com/18481-world- ... vered.html
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Re: Nature's Children

Post by Mark » Tue Feb 21, 2012 8:44 pm

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Re: Nature's Children

Post by Mark » Thu Mar 01, 2012 10:54 am

Six-Legged Giant Finds Secret Hideaway, Hides For 80 Years
http://www.npr.org/blogs/krulwich/2012/ ... r-80-years
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Re: Nature's Children

Post by Mark » Sat Mar 03, 2012 5:29 pm

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Re: Nature's Children

Post by Mark » Mon Mar 05, 2012 10:36 pm

Spider silk conducts heat as well as metals
http://www.sciencedaily.com/releases/20 ... 132613.htm
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Mark
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Re: Nature's Children

Post by Mark » Thu Mar 08, 2012 3:34 pm

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Mark
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Re: Nature's Children

Post by Mark » Thu Mar 08, 2012 9:56 pm

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Re: Nature's Children

Post by Mark » Sat Mar 10, 2012 11:27 am

Brown Owl remarkable head stability
http://www.youtube.com/watch?v=k6M-h5g3PwI
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