20 SEP 2011 by ideonexus

 Resistance to Insecticides and Herbicides as Evolution

Still other species have adapted via selection to human-caused changes in their environment. Insects have become resistant to DDT and other pesticides, plants have adapted to herbicides, and fungi, worms, and algae have evolved resistance to heavy metals that have polluted their environment. There almost always seem to be a few individuals with lucky mutations that allow them to survive and reproduce, quickly evolving a sensitive population into a resistant one. We can then make a reasonable ...
Folksonomies: evolution resistance
Folksonomies: evolution resistance
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If plants and insects can evolve resistance to these human-induced selective pressures, then we may assume they evolve to other natural environmental pressures as well.

20 SEP 2011 by ideonexus

 Penicilin Resistant Staphylococcus

Another prime example of selection is resistance to penicillin. When it was introduced in the early 1940s, penicillin was a miracle drug, especially effective at curing infections caused by the bacteria Staphylococcus aureus (“staph”). In 1941, the drug could wipe out every strain of staph in the world. Now, seventy years later, more than 95 percent of staph strains are resistant to penicillin. What happened was that mutations occurred in individual bacteria that gave them the ability to ...
Folksonomies: evolution resistance
Folksonomies: evolution resistance
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Evolution in action.

19 JUN 2011 by ideonexus

 A Brief History of People Resisting Technological Advance...

Look at how often change is fought in history. Here’s an example that always tickles me. The chain of events back in the twelfth century that set Europe going economically after the Dark Ages was essentially the textile revolution. A new loom came in from Arab Spain. It had foot pedals, which left the weaver’s hands free to weave faster and make more cloth cheaper. The Dutch weavers smashed the thing up because it would have put people out of work. (That was a new idea in the twelfth cent...
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Even though the advances ultimately benefit society as a whole, people resist and riot because they are put out of work or may lose power from the change.