Figure 3

Chromatogram of 10 essential oils

fightcub — Mon, 09 Feb 2009 07:00:45 +0000

The scan of TLC plate (silica gel G) with 10 essential oils developed with mobile phase toluene – ethyl acetate (93:7 v/v), next sprayed with vanillin in H2SO4 and heated. From left to right oils from: bergamot, cedar, eucalyptus, syzygium, malaleuca, lavandula, mint, orange, pine, spruce. Identified components: B1 and L1 – linalol, B2 and L2 – linalyl acetate, E1 – cinneol, G1 – eugenol, G2 – carryophyllene. Doubtfully identified components – C1 – cedrol, M3 – menthol, P1 – limonene.

by Lukke (2007), via Wikipedia

A Molecular Dance in the Blood, Observed

fightcub — Fri, 06 Feb 2009 09:00:24 +0000

Human hemoglobin, in your blood cells, displays precise changes in internal cooperativity in response to exactly how the first two oxygens bind to it.

LiCata V (1990) Resolving Pathways of Functional Coupling in Human Hemoglobin Using Quantitative Low Temperature Isoelectric Focusing of Asymmetric Mutant Hybrids. PhD Thesis (Johns Hopkins University), via the 2009 AAAS/Science Dance Contest

Stacking Z-Tetrominoes

fightcub — Thu, 05 Feb 2009 07:55:52 +0000

The Tetris game consisting of only Z-tetrominoes alternating orientation will always end before 70,000 tetrominoes have been played.

Burgiel H (1997) How to lose at Tetris. Mathematical Gazette 81:194-200

Panorama from Point Sublime

fightcub — Wed, 04 Feb 2009 07:00:08 +0000

Dutton CE (1882) The Tertiary History of the Grand Cañon District. (United States Geologic Survey)
Illustration by William Henry Holmes

Schematics of calculated band structure of crystalline Si

fightcub — Tue, 03 Feb 2009 16:00:06 +0000

Going from left to right along the horizontal, the wavevector is tracing out a particular one-dimensional path through the three-dimensional “first Brillouin zone”. On the vertical axis is the energies of bands at that wavevector.

Chelikowsky JR, Cohen ML (1974) Phys Rev B 10:5095-5107, via Wikipedia

Experimental set-up to induce the ‘body swap illusion’

fightcub — Mon, 02 Feb 2009 08:47:16 +0000

In the illusion condition, the participant and the experimenter squeezed their hands in a synchronous manner, whereas in the control condition they squeezed each other’s hands in an alternating rhythm, with the experimenter returning the squeeze in a semi-random manner.

Petkova VI, Ehrsson HH (2008) If I Were You: Perceptual Illusion of Body Swapping. PLoS ONE 3(12): e3832

Bonds between monkeys may be Asymmetric (A) or Symmetric (S)

fightcub — Sun, 01 Feb 2009 23:06:47 +0000

If the two sites are joined by a symmetric link (S) then a pair with twofold rotational symmetry is produced and this cannot grow further without introducing a new link, which in turn maybe either symmetric or asymmetric. (These comments are best understood by manipulating a few monkeys.)

Green, NM (2006) Monkeys Ape Molecules: An online exhibition