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This 3 page Class Notes was uploaded by Anahit Ghaltaghchyan on Friday April 1, 2016. The Class Notes belongs to at 1 MDSS-SGSLM-Langley AFB Advanced Education in General Dentistry 12 Months taught by in Summer 2015. Since its upload, it has received 19 views.
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Date Created: 04/01/16
EEMB 3 Diversity of microbes and fungi Bacteria and archaea Look similar under microscopes Very different genetic codes observed when studied Gaia Hypothesis- ear is a living entity and its biosphere regulates and maintains climate and atmosphere at an optimum Concentration vs time plot. Kinetic plot of reactants and products vs time. Steady state chemical equilibrium reached. Evidence of an “inert” planet. Venus- amount of nitrogen found in atmosphere is less than 2%. CO2 is about 95%.. no O2… planet is in chemical equilibrium, has been this way for a long time, and is inert… most planets exhibit this type of pattern But Earth has N-77%, CO2- about 0.03%, O2 about 21.6% Disequilibrium drives life. Driven by biology and diversity of life on Earth 97% of the diversity on earth has already gone extinct diversity driven by terrestrial ecosystem and aquatic ecosystem (97.5% is salt water. 71% of earth occupied by oceans 300x more space for life than on land or fresh water most of the biomass in the ocean is microbial iClicker question answer- microbes are responsible for the oxygen we breathe Microbial life 90% of human body are microbial cells Typically have bad reputation 10X more bacteria cells than humans help digest food help fight pathogens help provide pathogens “beneficial invisible presence” found anywhere where you find water…ice, marine,, fresh, saltwater prokaryotic microbes have the most metabolic diversity bacteria and archaea small- high surface area to volume ratio replicate very quickly influence the chemistry of their surroundings high turnover rates have very important functions we are much more dependent on these prokaryotes compared to them being dependent on us Aquatic microbes Bacteria, archaea, protists, fungi, viruses Microbes and the Origins to Life Big bangs Condensation lead to galaxies and solar system 1. Degrading and condensation 2. 2. Comet impact- bring ice to Earth 3. asteroid impact- h2o inside asteroids brought to earth ratio of heavy: normal H2O provides clue/ evidence deuterium vs hydrogen in water study done showing that asteroids could have been the source of water on Earth. Rules out comets and whatnot due to significantly different compositions of D/H compared to Earth’s oceans Earth 4.5 by 2 Oceans 4.2 by Oldest rock 3.8-4 by Microfossils 4.6-3.8 by So What constitutes life? Essential characteristics of life- cell theory: basic unit of life Membranes Aqueous systems Monomers to macromolecules Information carriers (RNA and DNA) And translation apparatus Energy storage and flow Catalysts 3