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Related Concept Videos

Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

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 light...
Photosystem I01:27

Photosystem I

Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
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What is Photosynthesis?00:39

What is Photosynthesis?

Photosynthesis is a multipart, biochemical process that occurs in plants as well as in some bacteria. It captures carbon dioxide and solar energy to produce glucose. Glucose stores chemical energy in the form of carbohydrates. The overall biochemical formula of photosynthesis is 6 CO2 + 6 H2O + Light energy → C6H12O6 + 6 O2. Photosynthesis releases oxygen into the atmosphere and is largely responsible for maintaining the Earth’s atmospheric oxygen content.
What is Photosynthesis?01:00

What is Photosynthesis?

All living organisms on Earth are directly or indirectly dependent on photosynthesis. It is the only biological process that can capture energy from sunlight and convert it into chemical energy that every organism can use to power its metabolism. Photosynthesis is also the source of oxygen required by many living organisms.
Types of Organisms Based on their Modes of Nutrition
Broadly, there are two main categories of organisms based on their modes of nutrition — autotrophs and heterotrophs. An...
Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

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 sulfur bacteria, heliobacteria, and...
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Photosystem II

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.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment molecules...

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Related Experiment Video

Updated: May 14, 2026

Studying the Supramolecular Organization of Photosynthetic Membranes within Freeze-fractured Leaf Tissues by Cryo-scanning Electron Microscopy
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Organ preservation using a photosynthetic solution.

Ippei Yamaoka1, Takeshi Kikuchi1, Tomohiro Arata1

  • 1Otsuka Pharmaceutical Factory, Inc, 115 Kuguhara, Tateiwa, Muya-cho, Naruto, Tokushima, 772-8601, Japan.

Transplantation Research
|February 2, 2013
PubMed
Summary

Chlorella photosynthesis improved blood gas balance and pancreas preservation in donation after cardiac death (DCD) models. This novel respiratory support enhanced graft survival after transplantation, overcoming challenges of static cold storage.

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Studying the Supramolecular Organization of Photosynthetic Membranes within Freeze-fractured Leaf Tissues by Cryo-scanning Electron Microscopy
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Area of Science:

  • Biomedical Engineering
  • Organ Transplantation
  • Photosynthesis Applications

Background:

  • Organs in circulatory deficit face low O2/high CO2, compromising post-transplant function.
  • Donation after cardiac death (DCD) presents preservation challenges due to warm ischemia.
  • Evaluating novel methods to improve organ viability from DCD donors is critical.

Purpose of the Study:

  • To assess the efficacy of Chlorella photosynthesis as respiratory assistance for preserving rat pancreases from DCD models.
  • To investigate the impact of this photosynthetic support on graft recovery and function post-transplantation.

Main Methods:

  • Rats received controlled ventilation with or without Chlorella photosynthetic respiratory assistance via an intraperitoneal pouch.
  • Perfluorocarbon gas carriers were used to facilitate gas exchange.
  • DCD rat pancreases were preserved for 30 minutes under cold, hypothermic, or hypothermic with photosynthetic support conditions.
  • Preserved pancreases were heterotopically transplanted into diabetic rats.

Main Results:

  • Photosynthetic respiratory support significantly improved blood oxygen (PaO2) and reduced carbon dioxide (PaCO2) levels.
  • All rats transplanted with pancreases preserved using photosynthetic support survived.
  • This survival rate contrasts sharply with the failure observed in pancreases preserved using static cold storage.

Conclusions:

  • Photosynthetic respiratory assistance using Chlorella effectively improves blood gas status during respiratory insufficiency.
  • This method enhances graft recovery in pancreas transplantation from DCD donors, mitigating damage from warm ischemia.
  • Chlorella photosynthesis offers a promising strategy for improving organ preservation and transplantation outcomes.