|
Size: 966
Comment:
|
Size: 3116
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 12: | Line 12: |
| .008 '''The Origin of Life''' .034 '''DNA''' .060 '''Photosynthesis''' .088 '''The Complex Cell''' Mitochondria .. .118 '''Sex''' .144 '''Movement''' .172 '''Sight''' .205''' Hot Blood''' .232 '''Consciousness''' |
.008 '''The Origin of Life''' Undersea alkaline vents produce small-celled nickle-iron compartments, and energetic chemical reactions that are much like living organisms use today. This is the best part of the book, because it provides a plausible high-probability organic chemistry path from primordial conditions to the first living cells. This is a complementary description to Linton and Watsons [[ RevolutionEarth | Revolutions that Made The Earth ]], which focuses on life's slow chemical restructuring of that environment. .034 '''DNA''' - RNA may have begun as a template molecule for guiding the formation of biomolecules. But RNA is fragile and structurally limited, so it expanded its repertoir with the aid of other molecules (leading to ribosomes), while DNA evolved to accurately duplicate RNA. The precursors of RNA codons are found in those alkaline vents. .060 '''Photosynthesis''' is the combination of two Photosystem 2 and Photosystem 1, evolving in separate prokaryotes and combining in eukaryotes. Once. This generated oxygen, slowly, until the world was transformed. .088 '''The Complex Cell''' Mitochondria. Another prokaryote fusion. This separates mutation-generating combustion from most of the cell's genetic material, including most of the genetic material of modern mitochondria. Some remains, for regulation. .118 '''Sex''' evolved to allow varied immunity to pathogens. Clones have identical immune systems, and rapidly-evolving pathogens can duplicate and exploit that. Dandelions are clones (p121) - which over time ought to make them vulnerable to epidemics. However, the real advantage of sex and variation is that it allows rapid exploitation of changing environments. .144 '''Movement''' Myosins, actins, kinesins, dyneins, and motor proteins powered by ATP. .172 '''Sight''' Lensed eyes are more accurate, but lensless eyes are more sensitive. .205''' Hot Blood''' - high CO,,2,, levels produce low nitrogen, low protein, high carb plants. In high CO,,2,, eras, sufficient protein required eating lots of plants, and burning off the excess carbs. .232 '''Consciousness''' up to 10,000 synapses per neuron, 240 trillion synapses in the cerebral cortex. Phased locked oscillations, neural handshaking. Magic quantum effects are BS, and can't possibly operate at macroscale in a turbulent chemical environment. |
Nick Lane
biochemist at University College, London
Oxygen, The Molecule that made the World Oxford, 2002
- p215: James Lovelock estimates respired oxygen damage equivalent to whole body dose of 1 Sv (100 rem) per year.
- Fukushima was about 300 Sv to workers and population. At 1 cancer / 1000 Sv, that's about 0.3 cancers. The cancers caused by the coal plants Fukishima replaced are in the thousands.
Life Ascending The 10 Great Inventions of Evolution 2009
The overall message: Life is an optimized version of the easiest steps.
008 The Origin of Life Undersea alkaline vents produce small-celled nickle-iron compartments, and energetic chemical reactions that are much like living organisms use today. This is the best part of the book, because it provides a plausible high-probability organic chemistry path from primordial conditions to the first living cells. This is a complementary description to Linton and Watsons Revolutions that Made The Earth, which focuses on life's slow chemical restructuring of that environment.
034 DNA - RNA may have begun as a template molecule for guiding the formation of biomolecules. But RNA is fragile and structurally limited, so it expanded its repertoir with the aid of other molecules (leading to ribosomes), while DNA evolved to accurately duplicate RNA. The precursors of RNA codons are found in those alkaline vents.
060 Photosynthesis is the combination of two Photosystem 2 and Photosystem 1, evolving in separate prokaryotes and combining in eukaryotes. Once. This generated oxygen, slowly, until the world was transformed.
088 The Complex Cell Mitochondria. Another prokaryote fusion. This separates mutation-generating combustion from most of the cell's genetic material, including most of the genetic material of modern mitochondria. Some remains, for regulation.
118 Sex evolved to allow varied immunity to pathogens. Clones have identical immune systems, and rapidly-evolving pathogens can duplicate and exploit that. Dandelions are clones (p121) - which over time ought to make them vulnerable to epidemics. However, the real advantage of sex and variation is that it allows rapid exploitation of changing environments.
144 Movement Myosins, actins, kinesins, dyneins, and motor proteins powered by ATP.
172 Sight Lensed eyes are more accurate, but lensless eyes are more sensitive.
205 Hot Blood - high CO2 levels produce low nitrogen, low protein, high carb plants. In high CO2 eras, sufficient protein required eating lots of plants, and burning off the excess carbs.
232 Consciousness up to 10,000 synapses per neuron, 240 trillion synapses in the cerebral cortex. Phased locked oscillations, neural handshaking. Magic quantum effects are BS, and can't possibly operate at macroscale in a turbulent chemical environment.
260 Death ... happens after we no longer contribute to offspring. Natural selection cannot improve what it is blind to - old age.