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originally posted by: Raggedyman
Yeah but the problem is the mutation never, ever, ever mutates into something better, it ALWAYS de-evolves
originally posted by: Raggedyman
Now don't forget, evolution according to Charlie Darwin
If you want to change the definition, please let me know
originally posted by: pthena
a reply to: chr0naut
Since e-coli take about 20 minutes to reproduce that would only be about 792 generations.
The long-term evolution experiments using E. coli, begun by Richard Lenski in 1988, have allowed direct observation of major evolutionary shifts in the laboratory.[39] In this experiment, one population of E. coli unexpectedly evolved the ability to aerobically metabolize citrate, which is extremely rare in E. coli. As the inability to grow aerobically is normally used as a diagnostic criterion with which to differentiate E. coli from other, closely related bacteria, such as Salmonella, this innovation may mark a speciation event observed in the laboratory.
Escherichia coli: Genome plasticity and evolution
The link to the Lenski experiments aren't working. But:
The E. coli long-term evolution experiment (LTEE) is an ongoing study in experimental evolution led by Richard Lenski that has been tracking genetic changes in 12 initially identical populations of asexual Escherichia coli bacteria since 24 February 1988.[2] The populations reached the milestone of 50,000 generations in February 2010 and 65,000 in June 2016.
This should be an interesting read.
originally posted by: Raggedyman
a reply to: peter vlar
Actually PV
I defined evolution with a link on age 1 or 2
I also used Darwin
I have been very fluid
The argument about mutations losing information just doesn't seem to cut it
But by all means, show me the latest stuff
a reply to: WakeUpBeer
I think you missed my point I asked for what new information was added
A recent article in New Scientist entitled Why microbes are smarter than you thought looks at six behaviours that seem remarkably intelligent for single celled organisms. Single-celled organisms don’t have nervous systems, let alone brains, but they could be viewed as with internal machinery that can process and respond to information .
If Bacillus subtilis cells are growing in a nutrient-poor area, they release chemicals into their surroundings which tell their neighbours “There’s not much food here, so clear off or we’ll both starve.” In response to these chemical messages, the other bacteria move away, changing the shape of the colony.
Many microbes can accelerate the rate at which their genes mutate. This allows them to obtain new abilities that may be helpful when conditions get tough. Escherichia coli mutates more rapidly when under stress (Stress-induced mutagenesis in bacteria.Science. 2003 300(5624): 1404-9), and yeast can perform the same trick (Adaptive mutation in Saccharomyces cerevisiae. Crit Rev Biochem Mol Biol. 2007 42(4): 285-31).
When the amoeba Dictyostelium searches the surface of a Petri dish for food, it makes frequent turns. But it does not do so randomly. If it has just turned right, it is twice as likely to turn left as right on its next turn, and vice versa. It remembers which direction it last turned.
Bacteria is Very Smart Buggers ! no really .. High MicroBial Intelligence they can communicate on a one on one level or like a fricken NETWORK! ..
Some bacteria possess mechanically-sensitive ion channels, as well as microscopic propellers that drive movement, giving them a rudimentary sense of touch and the ability to move. Within a single bacterial cell, sensation, information processing (you could call it a simple form of 'memory'), and reaction can be coordinated, partially thanks to the same ion channels responsible for human brain signaling. Eons before more complex organisms would use neurons to build nervous systems, ion channels were aiding bacteria in their quest to interact with their surroundings. 4hexn-DtSt4
originally posted by: Woodcarver
Here is a hint. Evolve means change.
originally posted by: Tempter
Viruses can withstand losing a lot of their DNA. Why? They're simple and not truly alive. Ok, I've hard that before.
But whyyyy?
Why are they in a state which reproduces and animates yet does not exhibit other functions of life?
Why are they special?
originally posted by: Woodcarver
a reply to: whereislogic
However life is created by chemistry.
However life is created by chemistry.