シャドーイング練習: Viruses: Components & Shapes - Microbiology Acellular Pre-Nursing, Pre-Med | @LevelUpRN - 動画で英語スピーキングを学ぶ
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Hi, I'm Kathy with Level Up RN.
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In this video, I'm going to begin my coverage of topics from the Acellular Infectious Agents section of our Microbiology Flashcard deck.
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Specifically, I'll be talking about viruses, including key characteristics of viruses, virus components, and virus shapes.
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I've included a quiz at the end of the video to test your knowledge on some of the key facts
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I'll be covering, so definitely stay tuned for that.
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And if you have our Level Up RN microbiology flashcards, go ahead and pull out your flashcards on viruses
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so you can follow along with me
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and pay close attention to the bold red text on the back of the cards
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because those are the things that you are likely to get tested on in your micro class.
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Viruses are acellular pathogens.
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This means that they are not composed of cells and do not contain cells.
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Viruses require a host cell in order to survive.
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They basically hijack the host cell's machinery to reproduce, synthesize viral proteins, and assemble virus components.
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This makes them obligate intracellular parasites.
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Viruses come in a variety of sizes, but in general, they are very small, usually between 20 and 900 nanometers in length.
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Each virus has a host range, which is the range of species and cell types that the virus can infect.
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So for example, a bacteriophage is a virus that only infects bacterial cells.
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They do not infect human cells.
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A virulent phage is a bacteriophage that infects a bacterial cell and causes the cell to lice or burst,
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which results in cell death.
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Whereas a temperate phage integrates its genetic material into the host cell's chromosome,
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and that genetic material is replicated when the host cell replicates.
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So in the next video, in this video playlist, we will go into detail about the different ways that a bacteriophage can replicate.
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Of note, when you see the term virion, that is referring to a virus particle that is outside the host cell.
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So it's basically the extracellular form of a virus that is capable of infecting a new host.
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Let's now talk about the different components that make up a virus.
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So each virus will contain genetic material.
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This may be DNA or RNA, but not both.
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And then in addition to the DNA or RNA, each virus will have a capsid,
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which is a protein coat that surrounds and protects the genetic material.
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The capsid is made up of capsimeres, which are protein subunits that interlock to form the capsid.
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Many viruses also have an envelope, which is a phospholipid membrane that surrounds the virus.
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This envelope is derived from the host cell when the virus pinches off from the host cell during a process called budding.
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A virus that lacks an envelope is referred to as a non -enveloped virus or a naked virus.
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Some viruses also have spikes, which are protein structures that extend outward and away from the virus.
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These spikes allow the virus to more effectively attach to the host cell, enter the cell, and cause infection.
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So viruses that have spikes tend to be more virulent.
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An example of a virus that has spikes is the coronavirus, which causes COVID -19.
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Now let's talk about key virus shapes, which include a helical shape, a polyhedral shape, and a complex shape.
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A virus with a helical shape has a cylindrical
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or rod -shaped capsid with the viral nucleic acid poiled up inside the capsid.
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An example of a virus with a helical shape is the tobacco mosaic virus.
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A virus with a polyhedral shape has a nucleic acid surrounded by a multi -sided capsid.
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An example of a virus with a polyhedral shape is the adenovirus.
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An icosahedron is a polyhedron with 20 equilateral triangular sides,
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which makes the virus appear spherical in shape.
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An example of a virus with an icosahedral shape is the poliovirus.
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And of note, helical viruses and polyhedral viruses may also have an envelope.
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Lastly, some viruses will have a complex shape, which includes features of both helical and polyhedral viruses.
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The most common example of a virus with a complex shape is a bacteriophage.
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So as you can see in the image, the head of the bacteriophage has a polyhedral shape,
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whereas the tail of the bacteriophage has a helical shape.
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All right, it's quiz time, and I have five questions for you.
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Question number one, what do you call the protein coat that surrounds and protects the nucleic acid of a virus?
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The answer is the capsid.
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Number two, what do you call the protein subunits that make up a capsid?
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The answer is capsomeres.
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Number three, what is a naked virus?
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The answer is a virus that lacks an envelope.
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Number four, what viral shape is shown here?
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The answer is helical.
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And number five, what do you call a complete virus particle outside the host cell?
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The answer is a virion.
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All right, that's it for this video.
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I hope you found it to be helpful.
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If so, be sure to hit that like button.
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Take care and good luck with studying!
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このレッスンの語彙とスピーキングのポイント
このスピーキングレッスンは、動画「Viruses: Components & Shapes - Microbiology Acellular Pre-Nursing, Pre-Med」を教材にしています。 繰り返し出てくる語は次のとおりです：virus, shape, cell, viruses, host。 この動画には、シャドーイング用の文が17文、単語が891語あります。 音声の長さは6:43です。 話す速さは1分あたり約133語で安定しており、シャドーイングしやすいペースです。 英語の頻出3,000語に含まれる単語は69%だけなので、語彙は難しめです。 全17文のうち5文が疑問文なので、疑問文のイントネーションや短い受け答えの練習に向いています。
この動画の重要語彙
動画に出てくる覚えておきたい単語15語を、発音と意味つきで紹介します。
| 単語 | 発音 | 意味 |
|---|---|---|
| virus 名詞 | /ˈvaɪ.ɹəs/ | ウイルス, ウィルス |
| envelope 名詞 | /ˈɛnvə(ˌ)loʊp/ | 封筒 |
| genetic 形容詞 | /d͡ʒəˈnɛt.ɪk/ | 遺伝的 |
| spike 名詞 | /spaɪk/ | 針 |
| surround 動詞 | /səˈɹaʊnd/ | 囲む, 取り巻く |
| acid 名詞 | /ˈæsɪd/ | 酸 |
| component 名詞 | /kəmˈpoʊ.nənt/ | 部分 |
| refer 動詞 | /ɹɪˈfɜː/ | 問い合わせる |
| helpful 形容詞 | /ˈhɛlp.fl̩/ | 役に立つ, 有用 |
| naked 形容詞 | /ˈneɪkɪd/ | 裸 |
| coat 名詞 | /ˈkoʊ̯t/ | コート, 外套 |
| particle 名詞 | /ˈpɑɹtək(ə)l/ | 粒子 |
| quiz 名詞 | /kwɪz/ | クイズ |
| topic 名詞 | /ˈtɑpɪk/ | 話題, テーマ |
| deck 名詞 | /ˈdɛk/ | デッキ, 甲板 |
動画に出てくる句動詞
| 単語 | 発音 | 意味 |
|---|---|---|
| go ahead 動詞 | /ˌɡoʊ əˈhɛd/ | どうぞお先に |
この動画の文法
話し手がよく使っている文型を、動画の実際の表現とともに紹介します。
| 文型 | 動画での表現 |
|---|---|
| 受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てる | are not composed · is replicated · is made |
| 関係詞節 who / which + 節 — 人や物について情報を加える | range, which is · capsimeres, which are · envelope, which is |
注意したい発音
話し手はI'll, I'm, I'veなど、短縮形や弱形を5回使っています。聞こえたとおりの短い形で発音しましょう。
- 「th」の音: pathogen /ˈpæθəd͡ʒn̩/, synthesize /ˈsɪnθəsaɪz/
- 「sh」と「zh」の音: infection /ɪnˈfɛkʃən/, machinery /məˈʃiːnəɹi/, infectious /ɪnˈfɛk.ʃəs/, flashcard /ˈflæʃˌkɑɹd/
- 長い単語（アクセントの位置に注意）: machinery /məˈʃiːnəɹi/, characteristic /ˌkæɹ(ə)ktəˈɹɪstɪk/, bacteriophage /bækˈtɪəɹ.ɪəʊˌfeɪd͡ʒ/, microbiology /ˌmʌɪkrə(ʊ)bʌɪˈɒlədʒi/, adenovirus /əˈdɛnəʊˌvaɪɹəs/
日本語話者が苦手な音：
- /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: viral /ˈvaɪɹəl/, replicate /ˈɹɛplɪkeɪt/, particle /ˈpɑɹtək(ə)l/, bacterial [bækˈtɪəɹiəɫ], flashcard /ˈflæʃˌkɑɹd/
- /v/ — /b/ にならないように、上の歯を下唇に当てる: virus /ˈvaɪ.ɹəs/, envelope /ˈɛnvə(ˌ)loʊp/, viral /ˈvaɪɹəl/, invite /ɪnˈvaɪt/, microwave /ˈmaɪkɹoʊˌweɪv/
- /f/ — 「フ」ではなく、上の歯と下唇で出す: refer /ɹɪˈfɜː/, helpful /ˈhɛlp.fl̩/, infection /ɪnˈfɛkʃən/, infectious /ɪnˈfɛk.ʃəs/, bacteriophage /bækˈtɪəɹ.ɪəʊˌfeɪd͡ʒ/
この動画での練習方法
- まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
- 通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
- 自分の声を録音して元の音声と比べます。virus, envelope, geneticなどの単語に特に注意しましょう。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。