Prática de Shadowing: Everything You Didn't Know About Fluorescent Animals - Aprenda a falar inglês com o YouTube
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Inside this box is...
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Inside this box is...
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The skull of a rat.
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If I place this rat skull underneath a UV blacklight, nothing will happen.
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But I have another skull, and something different will happen with this one.
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This is a squirrel skull.
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And if I place this skull under a UV black light, something very unusual happens.
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Ultraviolet light hits the squirrel skull and is absorbed by special compounds called porphyrins.
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After absorbing the UV light, the porphyrins gain a ton of energy, which they release as a different kind of light.
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Notice how the released light has a longer wavelength than the UV light.
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That means instead of being invisible UV light, it's visible light.
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That's pink.
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Here's what the rat skull looks like.
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This is what most bones look like under a a UV light.
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But here's what a squirrel skull looks like.
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It's pink.
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When things do this, we say they're fluorescent.
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Squirrels are fluorescent pink under UV lights.
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Well, just their insides, actually.
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But there are many other fluorescent animals that glow on the outside.
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To find our next fluorescent animal will take a trip to the desert.
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Ah, what a nice view.
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What was that?
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Over there.
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A scorpion.
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Now, if we place a scorpion under a UV blacklight, Just like the squirrel, something unusual happens.
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Ultraviolet light hits the scorpion's exoskeleton, is absorbed, then released back into the world at a different wavelength that we can see.
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This is just like the squirrel skulls, but there's one big difference.
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Notice how the light released by the scorpion has a shorter wavelength than the light released by the squirrel.
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Well that means instead of glowing pink like a squirrel skull the scorpion will glow a different color.
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It's green.
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There aren't any scorpions that live around me but I bet we can still find some fluorescent animals outside using this.
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This is a special flashlight.
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Take a look at the top.
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You see those bulbs?
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Those are a bunch of UV light bulbs.
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This is a UV flashlight.
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So let's go outside and search for some fluorescent animals.
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It's nighttime.
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Let's search in this forest.
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You never know what you'll find out here at night.
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So I found a few very fluorescent animals.
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We'll start with this one.
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This is a caterpillar.
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But what kind?
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Notice the white slashes on the caterpillar's side.
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They kind of go right up to the caterpillar's spiracles, those holes that they breathe out of.
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Then, look here on the end.
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There's a long extension on the caterpillar's backside Like a horn, almost If you come across a caterpillar with white slashes And a long horn on its rear end It's likely
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A tobacco hornworm caterpillar These can eat up your tomato plants throughout the summer But this was the star of the walk.
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No other plant glowed like this in the entire forest.
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So what plant is it?
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Alright, I got it.
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So notice how the leaf is shaped like a heart.
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All of the veins start at one point, and the surface of the leaf is kind of shiny and waxy.
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This is a vine called Smilax.
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But there's something strange about this fluorescence.
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Can you tell what it is?
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Squirrel skulls, scorpions, hornworms, they fluoresce everywhere.
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But Smilax only fluoresces in some places.
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Let's take a closer look.
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Do you notice how the most fluorescent parts of the leaf are the veins?
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Smilax doesn't have fluorescent compounds all over its entire surface, like a scorpion.
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Instead, its fluorescent compounds are concentrated in its veins.
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And that's why it looks like a Jackson Pollock painting.
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All of these organisms are naturally fluorescent.
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But scientists have created fluorescent animals too.
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To find out how, we'll take a trip into the ocean.
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This is a crystal jellyfish.
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Inside these jellyfish are a bunch of special proteins that fluoresce.
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of like porphyrins on squirrels.
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So under a UV light, crystal jellyfish naturally glow green.
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In the 1990s, scientists looked at the crystal jelly's DNA and found the specific sequence that made those special glowing proteins.
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Then they cut it out and added it into the DNA of...
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a zebrafish.
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Normal zebrafish look like this under a UV light.
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But the new fish that they created with a tiny bit of jellyfish DNA looked like this.
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It glowed green.
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The scientists had created a brand new fluorescent green fish.
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Naturally, they were very excited, so they did the same thing with fluorescent coral and sea anemones.
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They sliced out pieces of of their DNA and put them into fish.
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So the fish fluoresced too.
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And that's how they created fluorescent fish that look like this.
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Contexto e Antecedentes
No vídeo intitulado "Tudo que você não sabia sobre animais fluorescentes", o apresentador explora a fascinante capacidade de certos animais de emitir luz visível quando expostos à luz ultravioleta. Através de exemplos como o crânio de um esquilo e de um escorpião, ele revela como compostos especiais, conhecidos como porfirinas, interagem com a luz UV para criar esse efeito luminoso. Este conteúdo não apenas cativa a curiosidade dos espectadores, mas também oferece uma oportunidade valiosa para aprender inglês em um contexto científico e descontraído. Assistir a esse tipo de vídeo é uma forma eficaz de "aprender inglês com YouTube", promovendo o vocabulário técnico e a pronúncia correta.
As 5 Principais Frases para Comunicação Diária
- “O que acontece se colocarmos isso sob uma luz UV?” - Uma ótima maneira de iniciar uma conversa sobre curiosidades científicas.
- “Este crânio parece normal, mas…” - Ideal para expressar como as aparências podem enganar.
- “Isso é muito incomum!” - Uma frase útil para demonstrar surpresa e empolgação.
- “Observe a cor que aparece.” - Perfeito para descrever experiências visuais durante uma discussão.
- “Quais outros animais podem fazer isso?” - Uma ótima pergunta para estimular mais conversas sobre biologia.
Guia Passo a Passo de Shadowing
Para aproveitar ao máximo o vídeo e melhorar sua habilidade de "shadow speak", siga este guia prático de shadowing em inglês. O "shadowing" é uma técnica eficaz que pode ajudar você a dominar a prática de conversação em inglês.
- Assista o vídeo uma vez sem legendas. Tente entender o contexto geral e as principais ideias que estão sendo apresentadas.
- Ative as legendas em inglês. Isso irá ajudá-lo a acompanhar a fala do apresentador enquanto ajusta sua compreensão do idioma.
- Escolha frases específicas. Selecione as frases listadas acima e repita-as em voz alta após o apresentador, tentado imitar a entonação e a pronúncia.
- Pratique repetidamente. Assista ao clipe várias vezes, concentrando-se em diferentes partes e tentando incorporar o novo vocabulário.
- Conversação em grupo. Discuta o que aprendeu com amigos ou colegas que também querem aprender. Isso facilita a prática de conversação em inglês em um ambiente mais social.
Integrar estas técnicas ao seu aprendizado pode não apenas aprimorar suas habilidades linguísticas, mas também tornar o processo mais divertido e envolvente. Experimente usar a técnica de shadowing para absorver o conteúdo e enriquecer sua vivência no aprendizado do inglês!
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.
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