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Indicators02:39

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Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...
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Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Updated: Feb 14, 2026

Optical Quantification of Intracellular pH in Drosophila melanogaster Malpighian Tubule Epithelia with a Fluorescent Genetically-encoded pH Indicator
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Synthetic and genetically encoded fluorescent neural activity indicators.

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Neuroscience uses fluorescent activity indicators to visualize brain cell activity. Recent chemical and genetic sensor advances enable better measurement of cellular events in living brains.

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Area of Science:

  • Neuroscience
  • Chemistry
  • Biotechnology

Background:

  • Relating complex neural activity to behavior and cognition is a key goal in neuroscience.
  • Visualizing neuronal activity requires advanced tools and techniques.
  • Fluorescence microscopy is highly sensitive and suitable for brain imaging due to available hardware and sensors.

Purpose of the Study:

  • To provide a chemist's perspective on recent advancements in fluorescent activity indicators.
  • To highlight progress in sensors for measuring cellular events in the living brain.
  • To discuss the future development of hybrid indicators.

Main Methods:

  • Review of recent progress in fluorescent activity indicators.
  • Discussion of chemical and genetically encoded sensors.
  • Exploration of hybrid indicator designs.

Main Results:

  • Significant progress has been made in developing fluorescent sensors for neuronal activity.
  • Both chemically synthesized and genetically encoded sensors show promise.
  • Hybrid indicators combining synthetic dyes and genetic constructs are emerging.

Conclusions:

  • Fluorescent activity indicators are crucial for understanding brain function.
  • Advances in sensor chemistry and genetics are enhancing brain activity measurement.
  • Future research will likely focus on hybrid indicators for improved performance.