Presentation on theme: "Asymmetry:A Hidden Beauty Within Symmetry 1. Introduction 2. The Motif: Types of Symmetries I. Bilateral II. Translational III. Rotational 3. Variation."— Presentation transcript:
1. Introduction 2. The Motif: Types of Symmetries I. Bilateral II. Translational III. Rotational 3. Variation on the Theme: Handedness 4. Enjoying the Symphony: The Ultimate Design 5. Conclusion OUTLINE
1.Introduction Humans: Desire for order and perfection. Symmetry: Implies harmony Aristotelian View: The middle measure virtue through action.
The sphere became the symbol for the most perfect geometric shape
2. THE MOTIF Types of Symmetries: Bilateral Translational Rotational
The monopole problem of not finding a single north or a single south magnetic charge is still a mystery.
Nature seems to favor vertical symmetry as seen through the force of gravity operating only straight up and down.
Interestingly, Western art is dominant with vertical symmetry while Japanese and Chinese art tries to avoid symmetry.
Most profiles of faces in art face left. Most right-handed people prefer to draw left-facing profiles.
Water flowing in a bath tub at the north pole tend to spiral down the drain in a counterclockwise fashion.
In the northern half of the globe, cyclones and tornadoes tend to spin counterclockwise.
Thousands of animals have right - or left-handed helices. Ex. –the right-handed mollusk shells –some female birds exhibit only a left ovary
–the halibut is a right- eyed while the flounder is a left- eyed fish –the analeps (fish) has an asymmetric sex life
the right lung is larger than the left In humans, the left testicle usually hangs lower than the right
the heart, stomach, and pancreas are shifted more towards the left the liver and appendix are on the right
twists and turns of the intestines are completely asymmetric
In 1848 Pasteur recognized that organic compounds of living things are asymmetric.
All amino acids in living tissues have the same left-handed twist
Only the right-handed lactic acid is oxidized to pyruvic acid
Only the left-handed adrenaline is a cardiac stimulant
Left-handed carvone smells like spearmint Right-handed carvone smells like caraway
Pasteur Wrote: Life,as manifested to us, is a function of the asymmetry of the universe and of the consequences of this fact....I can even imagine that all living species are primordially, in their structure, in their external forms, functions of cosmic asymmetry.
Pasteur believed that some sort of basic asymmetry in the earths environment was responsible for the left- right bias of organic compounds.
He was fascinated by the sharp conflict between the symmetry of nonlife and the asymmetry of life.
He believed that if he could only discover how nature introduced this asymmetry into organic compounds, he would be close to the secret of life itself.
Here are possible explanations: Life began in one hemisphere, where the Coriolis forces may have provided the required twist. Had life started in the other hemisphere, the amino acids would now be right- handed instead of left.
Elliptically polarized light may have combined with the earths magnetic field to supply the twist
Russian scientist V. Vernadski suggested in 1931: –That the moon was separated from earth causing a left-handed twist to organic molecules
Physicist Joseph Rush in his book The Dawn of Life suggested (Signet,1962): –That perhaps self-replicating molecules of both handedness evolved in the primordial soup. A mutation of one left- handed molecule gave it the ability to cause the twist