File:Travel Deep Inside a Leaf - Annotated Version - California Academy of Sciences.webm
Travel_Deep_Inside_a_Leaf_-_Annotated_Version_-_California_Academy_of_Sciences.webm (file size: 26.81 MB, MIME type: video/webm)
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Summary
DescriptionTravel Deep Inside a Leaf - Annotated Version - California Academy of Sciences.webm |
English: Please turn on subtitles with the CC (Closed Captions) button to see the explanatory annotations designed for educators.
Transcript of closed captions: ⇓
0:05: We are approaching a redwood tree. To animate a scientifically accurate leaf, artists studied the texture of a redwood leaf specimen on a glass slide at high resolution. They even counted the stomata, and used that exact count for this film! 0:25: These leaves would be measured on a centimeter scale. Throughout the animation, we will gradually zoom in to smaller scales. 0:40: As we approach a single stoma, we are now on a millimeter scale. 0:48: As we enter the interior of the leaf, we see many individual palisade cells. These cells are where photosynthesis takes place; they are translucent to allow sunlight to enter. 1:00: As we approach a single palisade cell, we’ll zoom down to the micrometer scale. The shapes inside the cell are organelles: the bright globules at the bottom are the Golgi apparatus; the yellow spotted tubes are endoplasmic reticulum studded with ribosomes. 1:09: That large, blue membrane surrounds the nucleus; the purple blobs are mitochondria. 1:18: The faint, yellow, spider-web structure of the cytoskeleton provides structure and support to the cell. 1:24: You are about to enter a chloroplast; inside you see flat, pancake-like membranous structures called thylakoids. This is where the light-dependent reactions of photosynthesis take place to produce ATP, the cell’s energy carrier molecule. way 1:38: The time scale has changed: the molecules are shown moving 1 million times slower than in real life! 1:42: As we near an individual thylakoid, the animation scale continues to shrink down to the molecular level, where things are measured in nanometers. 1:52: The green and blue bush-like structures are photosystems: clusters of proteins that absorb light energy from the sun and help convert it into the chemical energy that’s stored in the bonds of the energy carrier molecule called ATP. 2:03: The yellow-green, rotating structure is an enzyme called ATP synthase. It pumps protons from one side of the thylakoid membrane to the other, assembling ATP molecules in the process. 2:16: The pulses of light in the thylakoid membrane in which the photosystems are embedded represent energized electrons being passed from one photosystem to another, passing along the energy which will be stored in the bonds of ATP (the classic “bucket brigade”). 2:26: The small “wigglies” are ATP molecules. Living things store energy in the bonds of the ATP molecules and then use that energy to conduct all the processes of life. This animation is a model, and has its strengths and limitations. In order to model something well, visual artists have to make decisions about what to represent and how best to do so. What’s present in this model, and what’s intentionally missing or altered? Find out by visiting https://www.calacademy.org/educators/travel-deep-inside-a-leaf - - - The California Academy of Sciences is a renowned scientific and educational institution dedicated to exploring, explaining, and sustaining life on Earth. Based in San Francisco’s Golden Gate Park, it's the only place in the world to house an aquarium, planetarium, rainforest, and natural history museum—plus cutting-edge research programs—all under one living roof. Connect with us: • Facebook: https://facebook.com/calacademy • Twitter: https://twitter.com/calacademy • Instagram: https://instagram.com/calacademy • Snapchat: https://www.snapchat.com/add/heycalacademy • Tumblr: https://heycalacademy.tumblr.com Čeština: Video, natočené Kalifornskou akademií věd detailně popisuje a vysvětluje průběh růstu rostlinného listu.
Français : Vidéo de l'Académie des sciences de Californie expliquant le fonctionnement d'une feuille.
العربية: مقطع مصور من إنتاج أكاديمية كاليفورنيا للعلوم تظهر رحلة داخل ورقة الشجر ويبين عملها.
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Date | |
Source | YouTube: Travel Deep Inside a Leaf - Annotated Version | California Academy of Sciences – View/save archived versions on archive.org and archive.today |
Author | California Academy of Sciences |
Assessment
This file was selected as the media of the day for 8 February 2021. It was captioned as follows:
Other languages
العربية: مقطع مصور من إنتاج أكاديمية كاليفورنيا للعلوم تظهر رحلة داخل ورقة الشجر ويبين عملها. Čeština: Video, natočené Kalifornskou akademií věd detailně popisuje a vysvětluje průběh růstu rostlinného listu. Français : Vidéo de l'Académie des sciences de Californie expliquant le fonctionnement d'une feuille.
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Licensing
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This file, which was originally posted to
YouTube: Travel Deep Inside a Leaf - Annotated Version | California Academy of Sciences – View/save archived versions on archive.org and archive.today, was reviewed on 16 June 2019 by reviewer Christian Ferrer, who confirmed that it was available there under the stated license on that date.
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Items portrayed in this file
depicts
3 January 2017
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Dimensions | User | Comment | |
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current | 12:27, 13 May 2019 | (26.81 MB) | imagescommonswiki>Eatcha | Imported media from https://www.youtube.com/watch?v=pwymX2LxnQs |
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