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MICR 221 Lecture Notes - Lecture 18: Astrobiology, Extremophile, Halophile

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School
Queen's University
Department
Microbiology and Immunology
Course
MICR 221
Professor
Eric B Carstens

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Document Summary

Hyperthermophilic bacteria and archaea are able to survive in temperatures close to boiling. Note the orange and brown microbial mats (j. schmidt, yellowstone park via nasa web site)) Psychrophiles can grow at temperatures close to 0 c, but many microbes are killed by subzero temperatures- this is the basis of the sewage bulbs in polar regions, as well as delta engineering"s. Why be interested in hot microbes: life elsewhere", molecular evolution, bioremediation. Industrial microbiology e. g. extremozymes (a case study), thermostable proteins, thermostable membranes. * note some bacteria can even grow in an autoclave! Can any microbes survive? expeditions to the antarctic in search of psychrophilic microbes and their secrets of survival e. g. case study: lake vostok. Lake has been sealed of from atmosphere for ~20 millions of years. Russians have been doing coring for a few years. Finally broke through a few months ago. Subglacial lake vostok (antarctica) accretion ice contains a diverse set of sequences from aquatic,

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Related Questions

- Scientific efforts to create artificial (synthetic) life have progressed rapidly in recent years. Briefly review a recent discovery in this area.

Your answer should be typed into the box below, and should be approximately 500 words in length. (No need for along writing).

- Comment on how the study of artificial life is relevant to the field of astrobiology.

Extremophiles have been found flourishing in hot, acidic sulfur springs, around hydrothermal vents deep in the ocean, and in soil with high levels of toxic metals. What does the existence of life in such extreme environments say about the possibility of life on other planets?

As plants colonized terrestrial environments, they continued to depend on water for reproduction (such ferns). A) Explain two adaptations present in gymnosperms and angiosperms that allowed them reproduce without relying on water. B) Explain the main two adaptations unique to angiosperms that allowed them to dominate terrestrial environments.