A Look at Different Ideas About the Human Mind, Evolution and Culture
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This 4 page paper compares and contrasts Ian Steward and Jack Cohen's Figments of Reality with Diamond's Guns, Germs and Steel. Ideas about evolution, the mind and culture and how it interrelates are discussed. No additional sources cited.
Filename: SA309evo.rtf

Acid Tolerance in Streptococcus mutans
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A 14 page discussion of the physiological mechanism employed by this species of oral bacteria which allow it to exist in the rapidly fluctuating pH levels of the human mouth. The author details how the cellular membrane of the organism is critical in this process, selectively allowing protons to pass out of the cell and preventing them from passing into the cell. This ability allows S. mutans a selective advantage. Acidogenicity (the ability to generate acid) and acidurance (the ability to function in an acidic environment) are the primary physiological traits of this organism which make it such an important factor in the production of dental caries as well. Bibliography lists 7 sources.
Filename: PPstrept.rtf

Acritarch Radiation in The Neoproterozoic
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This page paper looks at the evolution of the acritarch as evidenced by the fossil record and seeks to explain the sudden changes that took place over a period of fifteen million years during the Neoproterozoic, which long lasting implications into the Cambrian period. The bibliography cites 6 sources.
Filename: TEacritar.rtf