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  2. Phycoerythrin - Wikipedia

    en.wikipedia.org/wiki/Phycoerythrin

    Phycoerythrin (PE) is a red protein-pigment complex from the light-harvesting phycobiliprotein family, present in cyanobacteria, [1] red algae [2] and cryptophytes, [3] accessory to the main chlorophyll pigments responsible for photosynthesis.The red pigment is due to the prosthetic group, phycoerythrobilin, which gives phycoerythrin its red color.

  3. List of most-liked Instagram posts - Wikipedia

    en.wikipedia.org/wiki/List_of_most-liked...

    This list of most-liked Instagram posts contains the top 20 posts by number of likes on the photo and video-sharing social networking service Instagram. The most-liked post as of December 2024 [update] is of the Argentine footballer Lionel Messi and his teammates celebrating the 2022 FIFA World Cup win at Lusail Stadium in Lusail , Qatar ...

  4. Photopea - Wikipedia

    en.wikipedia.org/wiki/Photopea

    Photopea (/ ˈ f oʊ t ə ˈ p iː / FOH-tə-PEE) is a web-based photo and graphics editor. It is used for image editing, making illustrations, web design or converting between different image formats. Photopea is advertising-supported software.

  5. Polyethylene - Wikipedia

    en.wikipedia.org/wiki/Polyethylene

    Polyethylene was first synthesized by the German chemist Hans von Pechmann, who prepared it by accident in 1898 while investigating diazomethane. [12] [a] [13] [b] When his colleagues Eugen Bamberger and Friedrich Tschirner characterized the white, waxy substance that he had created, they recognized that it contained long −CH 2 − chains and termed it polymethylene.

  6. Photoelectric sensor - Wikipedia

    en.wikipedia.org/wiki/Photoelectric_sensor

    Conceptual through-beam system to detect unauthorized access to a secure door. If the beam is interrupted, the detector triggers an alarm. A photoelectric sensor is a device used to determine the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver.

  7. Photo-oxidation of polymers - Wikipedia

    en.wikipedia.org/wiki/Photo-oxidation_of_polymers

    Of these polyethylene terephthalate (PET) has only moderate UV resistance and the others, which include polystyrene, polyvinyl chloride (PVC) and polyolefins like polypropylene (PP) and polyethylene (PE) are all highly susceptible. Photo-oxidation is a form of photodegradation and begins with formation of free radicals on the polymer chain ...