Shadowing-Übung: Bioprocessing Part 1: Fermentation - Englisch Sprechen Lernen mit Video
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we all know something about fermentation it's a process used countless times each day to make a variety of dairy products,
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baked goods, and beverages.
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We sometimes think of it as letting foods go bad, but in a controlled way.
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With a little help, milk becomes yogurt, bread rises, and grains decompose,
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creating alcoholic beverages and alternative fuels.
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But looking at these examples only gives us a clue as to what's really happening,
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and how we can use the power of fermentation to cost -effectively create a broad array of biological products. So, what is fermentation?
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A cell can be thought of as a microfactory.
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These cells can be bacteria, fungi, or specific cells from mammals, plants, or insects.
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In biotechnology, these cells are used to manufacture a product in a process called fermentation.
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For yogurt, buttermilk, and cheese, we use bacteria.
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To make breads and alcoholic beverages, we use yeast, a fungus.
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And the production of some vaccines require the growth of mammalian cells that are infected with a specific virus.
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The product the cells manufacture is usually a chemical the cells contain naturally,
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or a substance that the cells have been genetically altered to create, or even a metabolic waste product of the organism's growth,
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like one of our examples, alcohol.
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There are too many everyday products created by commercial scale fermentation to even list, but some common ones include amino acids,
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biopharmaceuticals, dyes, enzymes, food products, lipids, steroids, and vitamins.
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Fermentation is a reasonably simple process.
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A cell is selected based on its ability to produce the desired product.
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A seed stock of cells is put into a small amount of media.
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Media provides the nutritional products the cell needs to grow.
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When the population of cells has grown and consumed most of the nutrients, it's moved into a larger vessel with more growth media,
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and the process repeats.
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This scaling up is complete when the quantity of cells is large
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and healthy enough to transfer into a production vessel often referred to as a bioreactor
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or fermenter with plenty of fresh media now available
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and under tightly controlled conditions the cells grow and manufacture product
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when the fermentation is complete the product is harvested fermentation is known as an upstream biotechnology process
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it occurs early in the production flow before recovery, purification, formulation, filling, and packaging.
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To better understand the fermentation process, we should first find out a little bit about the cells we use
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and what they may require to reproduce and stay healthy.
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Different cells have different needs.
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Some are aerobic, they need oxygen, while others are anaerobic and do not require oxygen.
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All cells require nutrition.
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A properly formulated media contains the necessary nutrients to allow cells to grow and produce.
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The fermenter mixes the cells evenly throughout the media to suspend the cells and supply the oxygen necessary for growth.
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Effective and efficient fermentation requires rigorous monitoring and control of the environment within the bioreactor.
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Key factors include temperature, pressure, pH, which is a measure of how acidic or alkaline the media is,
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oxygen, usually measured as dissolved oxygen within the media, and nutrient levels.
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Although the environment and the media are tailored to the needs of specific cells, the life cycle of almost all batches follows a predictable pattern.
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The growth pattern has four phases, lag, exponential or log.
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stationary, and death.
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When a cell is first introduced to fresh media, it has to adapt to its new environment.
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This creates a lull or lag in the growth timeline.
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After the organism adapts, the batch takes off.
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The cells begin dividing at a constant rate, an exponential or logarithmic or log increase,
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doubling, then doubling again, and on and on.
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As the nutrients in the media are consumed, toxic metabolic waste products build up, cells begin to die, and growth slows.
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When it reaches the point that just as many cells are dying as are dividing, the batch enters the stationary phase.
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This is the point at which the key nutrients are completely consumed, the fermentation is stopped, and the fermented broth is harvested.
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If the fermentation were allowed to continue, the cells would enter the death phase.
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More cells die than divide.
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And, similar to the exponential phase, the death rate increases logarithmically.
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Now that we have a basic understanding of how fermentation works, let's look at an actual process and see how it all comes together.
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For our sample process, we will look at the production of Green Fluorescent Protein, or GFP.
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GFP is broadly used as a biological marker.
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It's a fluorescent dye that's very well tolerated by most cells and doesn't interfere with normal cellular function.
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In the GFP fermentation process, we'll need to add an antibiotic to protect the purity of the batch, and then, late in the process,
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a biochemical inducer to turn on the GFP gene.
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Our materials for this process will include a bacteria seed stock, in this case E coli,
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that has been genetically enhanced to produce GFP.
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The basic ingredients for a compatible media which include nutrients, stabilizers, an antibiotic, and an anti -foaming agent,
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and IPTG, which is the biochemical inducer that switches on the GFP gene.
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The equipment that we'll be using includes a 300 -liter bioreactor, a UV -Vis spectrophotometer to monitor the optical density,
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which is a measure of the concentration of cells in the bioreactor, a glucose analyzer to measure glucose,
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a key nutrient, an offline pH meter to help track the acid -base balance and adjust online measurements if needed,
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and a broth tank for our final product.
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The bioreactor is equipped with a water jacket around the vessel to regulate temperature and integrated sensors to monitor key environmental factors,
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including dissolved oxygen, pH, internal temperature, water jacket temperature, and vessel pressure.
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The reactor also has an agitator, dedicated ports for adding seed stock and media ingredients,
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separate ports for acid and base supplement, air filters for supply and exhaust,
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and valves for drawing samples and for harvesting.
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Most fermentation and monitoring functions can be managed from the bioreactor's dedicated process controller.
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Before the fermentation process can begin, the area must be prepared.
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Preparation includes removing equipment and material that won't be used in the process, cleaning and sanitizing the area and equipment,
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and sterilizing equipment as required by the SOPs, Standard Operating Procedures.
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Sterilization is used to eliminate unwanted microorganisms, which can grow naturally in the fermentation media and process equipment.
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Also, all required materials and documentation should be gathered and prepared.
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And all process control software should be loaded and verified.
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The fermentation batch process will be guided and documented with the BPR, Batch Process Record.
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The batch record leads the operator through the process, step by step, with each step requiring a sign -off and separate verification.
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This record also includes spaces for documenting key times, activities, and instrument readings.
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The GFP fermentation process really begins with the expansion of our bacteria seed stock.
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After removing the specially modified E coli from the freezer and thawing it,
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it's used to inoculate a small amount of fresh media in a shaker flask.
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After the number of cells has reached the target amount, the thriving cells are ready for fermentation.
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Meanwhile, in the fermentation area, operators begin with a complete check of all critical equipment.
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Valves, caps, and lines are checked.
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Hoses are tightened.
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Probes are verified and calibrated.
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and 10 kilograms of HPW is added to the vessel.
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The bioreactor is brought up to normal process pressure and held there in order to check for leaks.
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The pressure is monitored over a 30 -minute period.
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If a leak is detected, the problem is corrected and the test is run again.
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Once the reactor passes the test, we are ready to mix the media in the vessel.
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The agitator is turned on, and the ingredients are added.
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Yeast extract, triptych soy broth,
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ammonium chloride, sodium biphosphate, monopotassium phosphate,
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and an anti -foam compound.
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Once all the initial ingredients are in, another 10 kilograms of high -purity water is added.
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All ports and valves are closed.
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All condensate valves are opened.
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And the bioreactor begins an SIP, sterilize -in -place cycle.
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The target for sterilization is 121 degrees Celsius for 30 minutes.
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As soon as the temperature climbs to the targeted temperature, the condensate valves are closed, and the SIP cycle completes automatically.
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Both the vessel and the media are now sterile, and we're ready to add the final ingredients to our media.
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The glucose hose is attached to the vessel, the connection is steamed to sterilize it,
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and the separately sterilized glucose antibiotic solution is pumped into the vessel.
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Then a manual pH reading of the media is taken and the bioreactor is set up for its fermentation cycle.
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After the inoculation hose is connected to the reactor and steamed for 20 minutes,
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the expanded seed stock is pumped into the reactor containing the media.
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Fermentation now begins.
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The operator takes zero -hour readings and begins to regularly monitor batch temperature,
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agitator RPMs, dissolved oxygen levels, pH, vessel pressure, optical density,
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airflow rate, and glucose concentrations.
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Optical densities and glucose concentrations are of particular interest, so they're graphed as well as documented.
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When the targeted levels of glucose and optical density are achieved, it's time to add IPTG to the vessel to activate
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or turn on the expression of the green fluorescent protein in the cells.
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After allowing enough time for the cells to produce green fluorescent protein usually five hours more final readings are taken
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and a sample is drawn to check the percentage of cell
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solids the product is now referred to as broth the broth
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which contains spent media and cells is complete
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when the key nutrient glucose is mostly consumed and the batch has reached the desired concentration.
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The batch is then cooled down, pumped into a broth tank, and labeled with the batch number, volume, time, and date.
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The fermentation process is now complete.
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The harvested broth will now move downstream to the recovery process, where the cells will be ruptured to free the green fluorescent protein,
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and the protein will be separated from the other broth components.
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Wortschatz und Sprechhinweise zu dieser Lektion
Diese Sprechübung basiert auf dem Video „Bioprocessing Part 1: Fermentation“. Diese Wörter kommen am häufigsten vor: cell, fermentation, process, product, vessel. Dieses Video enthält 128 Sätze und 1692 Wörter zum Nachsprechen. Der gesprochene Teil dauert 14:32. Der Sprecher spricht gleichmäßig mit etwa 116 Wörtern pro Minute – ein angenehmes Tempo fürs Shadowing. Nur 72 % der Wörter gehören zu den 3.000 häufigsten im Englischen, der Wortschatz ist also anspruchsvoll.
Wichtiger Wortschatz in diesem Video
15 lernenswerte Wörter aus dem Video, mit Aussprache und Bedeutung:
| Wort | Aussprache | Bedeutung |
|---|---|---|
| vessel Substantiv | /ˈvɛsəl/ | Schiff, Boot |
| batch Substantiv | /bæt͡ʃ/ | Liefermenge, Stapel |
| glucose Substantiv | /ˈɡluː.kəʊz/ | Glukose, Traubenzucker |
| nutrient Substantiv | /ˈnuː.tɹi.ənt/ | Nährstoff |
| oxygen Substantiv | /ˈɑksɪd͡ʒən/ | Sauerstoff, Oxygen |
| monitor Substantiv | /ˈmɑ.nɪ.tɚ/ | Aufpasser, Wächter |
| valve Substantiv | /ˈvælv/ | Ventil, Armatur |
| ingredient Substantiv | /ɪnˈɡɹiːdi.ənt/ | Zutat |
| density Substantiv | /ˈdɛn.sə.ti/ | Dichte, Massendichte |
| concentration Substantiv | /ˌkɑn.sənˈtɹeɪ.ʃən/ | Konzentration |
| harvest Substantiv | /ˈhɑɹ.vəst/ | Ernte |
| consume Verb | /kənˈsum/ | verbrauchen |
| reactor Substantiv | /ɹiˈæktɚ/ | Reaktor |
| acid Substantiv | /ˈæsɪd/ | Säure |
| operator Substantiv | /ˈɑpəˌɹeɪtɚ/ | Telefonist, Telefonistin |
Phrasal Verbs, die du hören wirst
| Wort | Aussprache | Bedeutung |
|---|---|---|
| build up Verb | sich ansammeln, sich türmen | |
| come together Verb | /ˈkʌm tʊˈɡɛðɚ/ | zusammenkommen |
| cool down Verb | /kuːl ˈdaʊn/ | sich abkühlen, abkühlen |
| find out Verb | herausfinden, erfahren | |
| take off Verb | ausziehen, loslösen |
Grammatik in diesem Video
Die Strukturen, die der Sprecher am häufigsten verwendet, mit den genauen Worten aus dem Video:
| Struktur | Im Video |
|---|---|
| Passiv be + Partizip Perfekt – wichtig ist, was geschieht, nicht wer es tut | can be thought · are infected · have been genetically altered |
| Present Perfect have/has + Partizip Perfekt – eine vergangene Handlung, die jetzt noch wichtig ist | have been · has grown · has been |
| Relativsätze who / which + Satz – eine Zusatzinformation über eine Person oder Sache | IPTG, which is · microorganisms, which can |
Aussprache, auf die du achten solltest
Der Sprecher verwendet 6 Kurzformen und abgeschwächte Formen, zum Beispiel we'll, doesn't, they're. Sprich sie in der kurzen Form, so wie du sie hörst.
- Die „th“-Laute: gather /ˈɡæðɚ/, thrive /θɹajv/, broth /bɹɔθ/
- Die Laute „sh“ und „zh“: concentration /ˌkɑn.sənˈtɹeɪ.ʃən/, stationary /ˈsteɪʃəˌnɛɹi/, efficient /ɪˈfɪʃənt/, preparation /ˌpɹɛpəˈɹeɪʃ(ə)n/, nutrition /njuːˈtɹɪʃ.ən/
- Lange Wörter – auf die Betonung achten: ingredient /ɪnˈɡɹiːdi.ənt/, concentration /ˌkɑn.sənˈtɹeɪ.ʃən/, operator /ˈɑpəˌɹeɪtɚ/, antibiotic /ˌæn.taɪ.baɪˈɑ.tɪk/, naturally /ˈnæt͡ʃ.(ə.)ɹə.li/
Laute, die Deutschsprachigen schwerfallen:
- /w/ — mit runden Lippen, nicht wie das deutsche „w“ (/v/): meanwhile /ˈmiːnwaɪl/, quantity /ˈkwɑn(t)ɪti/, unwanted /ʌnˈwɒntɪd/, equip /ɪˈkwɪp/
- Stimmhafter Auslaut — /b/, /d/, /g/, /z/, /v/ am Wortende nicht verhärten: glucose /ˈɡluː.kəʊz/, valve /ˈvælv/, acid /ˈæsɪd/, divide /dɪˈvaɪd/, beverage /ˈbɛv(ə)ɹɪd͡ʒ/
- /æ/ — offener als „ä“: batch /bæt͡ʃ/, valve /ˈvælv/, reactor /ɹiˈæktɚ/, acid /ˈæsɪd/, antibiotic /ˌæn.taɪ.baɪˈɑ.tɪk/
So übst du mit diesem Video
- Höre dir das ganze Video einmal an, ohne zu sprechen, und notiere die Wörter, die du nicht kennst.
- Sprich Satz für Satz in normaler Geschwindigkeit nach und wiederhole jeden, bis dein Rhythmus zum Sprecher passt.
- Nimm dich auf und vergleiche mit dem Original; achte dabei auf Wörter wie vessel, batch, glucose.
Was ist die Shadowing-Technik?
Shadowing ist eine wissenschaftlich fundierte Sprachlerntechnik, die ursprünglich für die professionelle Dolmetscherausbildung entwickelt und durch den Polyglotten Dr. Alexander Arguelles populär gemacht wurde. Die Methode ist einfach aber wirkungsvoll: Du hörst englisches Audio von Muttersprachlern und wiederholst es sofort laut — wie ein Schatten, der dem Sprecher mit nur 1–2 Sekunden Verzögerung folgt. Anders als passives Hören oder Grammatikübungen zwingt Shadowing dein Gehirn und deine Mundmuskulatur, gleichzeitig echte Sprachmuster zu verarbeiten und zu reproduzieren. Studien zeigen, dass es Aussprachegenauigkeit, Intonation, Rhythmus, verbundene Sprache, Hörverständnis und Sprechflüssigkeit signifikant verbessert — was es zu einer der effektivsten Methoden für die IELTS Speaking-Vorbereitung und reale englische Kommunikation macht.