Tags » Prokaryotes

Inorganic carbon and pH dependency of Trichodesmium’s photosynthetic rates

We established the relationship between photosynthetic carbon fixation rates and pH, CO2 and HCO3– concentrations in the diazotroph Trichodesmium erythraeum IMS101. Inorganic 14C-assimilation was measured in TRIS-buffered ASW medium where the absolute and relative concentrations of CO2, pH and HCO3– were manipulated. 183 more words


Microalgal photophysiology and macronutrient distribution in summer sea ice in the Amundsen and Ross Seas, Antarctica

Our study addresses how environmental variables, such as macronutrients concentrations, snow cover, carbonate chemistry and salinity affect the photophysiology and biomass of Antarctic sea-ice algae. We have measured vertical profiles of inorganic macronutrients (phosphate, nitrite + nitrate and silicic acid) in summer sea ice and photophysiology of ice algal assemblages in the poorly studied Amundsen and Ross Seas sectors of the Southern Ocean. 213 more words


Week 12 Reflection

This week in AP Bio we learned about the central Dogma as well as Gene expression in prokaryotes. In biology the central dogma is essentially how DNA turns into proteins. 934 more words


Translation: role and structure of ribosomes


  • Made up of rRNA (big one on top, little one on bottom) and proteins
    • The pieces of rRNA come together and initiates translation
      • Contains A, P, E sites where tRNA sit…
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An integrated response of Trichodesmium erythraeum IMS101 growth and photo-physiology to iron, CO2, and light intensity

We have assessed how varying CO2 (180, 380, and 720 μatm) and growth light intensity (40 and 400 μmol photons m−2 s−1) affected Trichodesmium erythraeum IMS101 growth and photophysiology over free iron (Fe′) concentrations between 20 and 9,600 pM. 179 more words


Elevated temperature drives kelp microbiome dysbiosis, while elevated carbon dioxide induces water microbiome disruption

Global climate change includes rising temperatures and increased pCO2 concentrations in the ocean, with potential deleterious impacts on marine organisms. In this case study we conducted a four-week climate change incubation experiment, and tested the independent and combined effects of increased temperature and partial pressure of carbon dioxide ( 246 more words


Plankton responses to ocean acidification: the role of nutrient limitation


• Ocean acidification increases phytoplankton standing stock.
• This increase is more pronounced in smaller-sized taxa.
• Primary consumers reac differently depending on nutrient availability. 212 more words