Digital Optical Phase Conjugation
Digital Optical Phase Conjugation - Related Videos
01:14
Phase II Conjugation Reactions: Overview
0 Views •
2025
Conjugation, a key component of phase II biotransformation reactions, is a vital process in drug detoxification. It involves transferring endogenous substances like glucuronic acid, sulfate, and glycine to drugs or their metabolites formed in phase I reactions. These conjugation reactions, often catalyzed by specific enzymes, transform potentially harmful metabolites into inactive, water-soluble forms easily excreted in urine or bile. By enhancing polarity and eliminating pharmacological...
01:19
Phase II Reactions: Miscellaneous Conjugation Reactions
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2025
Phase II biotransformations are detoxification mechanisms that conjugate xenobiotics with endogenous substances, neutralizing their toxicity. A key example involves the conjugation of cyanide ions, which impair cellular respiration and alter hemoglobin into non-oxygen-carrying cyanmethemoglobin. To neutralize this threat, a sulfur atom from thiosulphate is transferred to the cyanide ion, catalyzed by the enzyme rhodanese, resulting in an inactive compound called thiocyanate. The production of...
10:16
Optical Control of Living Cells Electrical Activity by Conjugated Polymers
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Cited by 6 •
2016
A method for stimulation of in-vitro cell cultures electrical activity with visible light, based on the use of organic semiconducting polymers is described.
01:19
Phase II Reactions: Sulfation and Conjugation with α-Amino Acids
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2025
Sulfation and α-amino acid conjugation are two critical biotransformation reactions in drug metabolism. Sulfation, a phase II biotransformation reaction, involves adding a polar sulfate group to a drug, enhancing its water solubility and promoting excretion. This process can either co-occur with or occur independently of glucuronidation. Nonmicrosomal sulfotransferase enzymes catalyze the process. The reaction involves 3'-phosphoadenosine-5'-phosphosulfate or PAPS coenzyme activation, sulfur...
01:22
Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation
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2025
Glutathione, a tripeptide made up of glutamate, cysteine, and glycine, is a critical player in the detoxification of drugs and xenobiotics via a process known as glutathione conjugation or mercapturic acid formation. This phase II biotransformation reaction involves the covalent binding of glutathione to a drug or its metabolite, enhancing the compound's water solubility and enabling its excretion. Several distinctive characteristics distinguish glutathione conjugation from other phase II...
FAQs
The phase-conjugate field is effective because it carries the recorded optical information in a form that can retrace the route taken by the original light. As it travels back through the same complex medium, the field can counteract distortions introduced by scattering and aberration. This makes wavefront control possible even when the medium prevents ordinary focusing from maintaining resolution.
Both measurements describe different aspects of the emerging optical field. Amplitude records how strongly light is distributed, while phase records the wavefront relationships needed to reproduce its propagation behavior. Using both allows the calculated conjugate field to represent the measured light more completely, supporting more accurate reconstruction when the field has been altered by a complex medium.
Conventional optics can lose resolution when light passes through turbid biological materials because scattering disrupts the intended wavefront. Digital Optical Phase Conjugation instead measures the emerging field and calculates a compensating wavefront before sending light back through the medium. This difference allows focusing and light delivery to remain accessible in situations where ordinary optical control is degraded.
A typical workflow first uses a camera to measure the amplitude and phase of light emerging from the complex medium. A computer then calculates the corresponding phase-conjugate wavefront. Next, a spatial light modulator recreates that calculated field. Sending the reconstructed field backward through the medium enables testing whether scattering and aberration have been counteracted and whether access or focusing has improved.
Researchers would use the technique when scattering or aberration makes it difficult to deliver light to, focus on, or image structures within biological tissue. Its ability to counteract distortions can improve access to structures hidden by the medium. These capabilities make it relevant to optical strategies that require greater control of light inside turbid biological materials.
Bioengineering often requires optical access to biological structures that are obscured by tissue scattering. Digital Optical Phase Conjugation provides a wavefront-control approach for working within that constraint rather than treating the tissue as optically clear. By supporting light delivery, focusing, and imaging in turbid materials, it can inform the development of noninvasive optical tools and improve access to hidden structures.