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Related Concept Videos

Photosystem I01:27

Photosystem I

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Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
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Photosystems01:32

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Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
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Photosystem II01:22

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The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
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Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

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Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
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Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

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Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
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Anoxygenic Phototrophic Bacteria01:28

Anoxygenic Phototrophic Bacteria

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Anoxygenic phototrophic bacteria are a diverse group of microorganisms that perform photosynthesis without producing oxygen. They primarily include purple sulfur bacteria, purple nonsulfur bacteria, green sulfur bacteria, and green nonsulfur bacteria. These bacteria are classified into the Gammaproteobacteria, Alphaproteobacteria, Betaproteobacteria, Chlorobi, and Chloroflexi lineages, each with distinct physiological and ecological adaptations.Purple sulfur bacteria belong to the...
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CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
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Potential for Phototrophy in Venus' Clouds.

Rakesh Mogul1, Sanjay S Limaye2, Yeon Joo Lee3

  • 1Chemistry & Biochemistry Department, California State Polytechnic University, Pomona, California, USA.

Astrobiology
|September 27, 2021
PubMed
Summary
This summary is machine-generated.

Venus

Keywords:
AerosolsIrradiancePhotosynthesisPhototrophsVenuspH

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Area of Science:

  • Astrobiology
  • Planetary Science
  • Atmospheric Science

Background:

  • Venus' atmosphere presents a unique environment for potential habitability.
  • Understanding phototrophy requires assessing solar irradiance and atmospheric chemistry.

Purpose of the Study:

  • To evaluate the potential for phototrophy in Venus' clouds.
  • To determine if Venus' atmospheric conditions could support life.

Main Methods:

  • Calculated solar irradiances using a radiative transfer model.
  • Analyzed Venus' atmospheric constituents and aerosol properties.
  • Compared Venus' conditions to Earth's habitable parameters.

Main Results:

  • Venus' clouds receive sufficient photon flux for photosynthesis.
  • Aerosols may contain neutralized sulfuric acid, creating favorable conditions.
  • Venus' phototrophic windows overlap with photosynthetic pigment absorption.

Conclusions:

  • Venus' atmosphere, particularly its clouds, shows potential for supporting phototrophic life.
  • Neutralized sulfuric acid aerosols contribute to a potentially habitable environment on Venus.