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Related Concept Videos

Photosystems01:32

Photosystems

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
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment molecules...
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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...
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...
Origin of Photosynthesis01:26

Origin of Photosynthesis

Photosynthesis represents a fundamental biological process that transformed Earth's atmosphere and paved the way for complex life. Emerging roughly 3.4–3.8 billion years ago, the earliest photosynthetic organisms harnessed light energy to produce organic compounds. These anoxygenic phototrophs used electron donors like hydrogen sulfide (H₂S) or ferrous iron (Fe²⁺), rather than water, and did not release molecular oxygen (O₂) as a byproduct. Various groups, including green sulfur and purple...
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

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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.
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Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses
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ON THE DYNAMICS OF PHOTOSYNTHESIS.

W J Osterhout1, A R Haas

  • 1Laboratory of Plant Physiology, Harvard University, Cambridge.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed a simple method to measure marine plant photosynthesis using phenolphthalein indicator. This technique accurately tracks the rate of photosynthesis in Ulva, revealing how light exposure influences this vital process.

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Area of Science:

  • Marine biology
  • Plant physiology
  • Biochemistry

Background:

  • Photosynthesis is crucial for marine ecosystems.
  • Accurate measurement of photosynthesis is essential for ecological studies.
  • Existing methods for measuring photosynthesis can be complex.

Purpose of the Study:

  • To develop a simple and accurate method for measuring photosynthesis in marine plants.
  • To investigate the effect of light exposure on the rate of photosynthesis in Ulva.
  • To propose a quantitative theory explaining the observed photosynthetic responses.

Main Methods:

  • Utilizing phenolphthalein as a pH indicator in seawater to detect photosynthetic activity.
  • Exposing the marine plant Ulva to sunlight after a period in darkness.
  • Observing and quantifying color changes in phenolphthalein to measure photosynthetic rates.
  • Adding bicarbonates for freshwater aquatic measurements.

Main Results:

  • Phenolphthalein accurately detects minute amounts of photosynthesis in marine plants.
  • Ulva initiates photosynthesis immediately upon light exposure.
  • The rate of photosynthesis in Ulva increases steadily until reaching a constant speed.
  • A potential mechanism involving sunlight-induced decomposition of a substance is proposed.

Conclusions:

  • Phenolphthalein offers a straightforward method for quantifying marine plant photosynthesis.
  • Light intensity directly influences the rate of photosynthesis in Ulva.
  • The study suggests a catalytic or direct role for sunlight-derived products in photosynthesis.