astronomy

Karl Gottlieb Grell

Karl Gottlieb Grell is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Karl Gottlieb Grell rather than just read about it. In short: Karl Gottlieb Grell (28 December 1912, Burg an der Wupper – 4 October 1994) was a German zoologist and protistologist, known for his work on Trichoplax. Karl Grell received his doctorate (Promotion) in 1934 from the University of Bonn, for a dissertation on the digestive tract of the common scorpionfly (Panorpa communis).

Key takeaways

Karl Gottlieb Grell belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Karl Gottlieb Grell to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Karl Gottlieb Grell from memory before moving on to harder problems.

Reference excerpt

Karl Gottlieb Grell (28 December 1912, Burg an der Wupper – 4 October 1994) was a German zoologist and protistologist, known for his work on Trichoplax. Karl Grell received his doctorate (Promotion) in 1934 from the University of Bonn, for a dissertation on the digestive tract of the common scorpionfly (Panorpa communis). Subsequently, he worked primarily on unicellular eukaryotes and the metazoan Placozoa. During World War II, he was assigned to an anti-malarial unit in southeast Europe.

After the war he returned to Bonn and started to work on nuclear dimorphism in ciliates. In 1954, with the help of the Rockefeller Foundation, he visited the laboratories of T.M. Sonneborn and L.R. Cleveland. Back in Germany Professor Grell became a coworker of Max Hartmann at the Max-Planck-Institute for Biology in Tuebingen. At the University of Tübingen, Grell was a professor of zoology, teaching protozoology and genetics. He led excursions to study marine protozoa. Grell authored a German-language textbook on protozoology, Protozoologie (1st edition 1956, 2nd ed. 1968), published in English as Protozoology in 1973. From 1959 to 1983 he was a co-editor for the Archiv for Protistenkunde. In addition to his work on Trichoplax, he was known for his research on life cycles of the Foraminifera. He was elected as an honorary member of the German Society for Protozoology in 1982, and was an Honorary President of the IX International Congress of Protozoology in Berlin in 1993.

References

External links Literature by and about Karl Gottlieb Grell in the German National Library catalogue

Worked examples

Example 1 — a first encounter with Karl Gottlieb Grell

Start with the simplest possible case. Write down what Karl Gottlieb Grell claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Karl Gottlieb Grell before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Karl Gottlieb Grell ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Karl Gottlieb Grell

In research: Karl Gottlieb Grell appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Karl Gottlieb Grell in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Karl Gottlieb Grell is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1912 births, 1994 deaths, 20th-century German zoologists, so understanding it makes those chapters shorter.
In everyday life: Look for Karl Gottlieb Grell outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Karl Gottlieb Grell in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Karl Gottlieb Grell means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Karl Gottlieb Grell out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Karl Gottlieb Grell in simple terms?

Why does Karl Gottlieb Grell matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Karl Gottlieb Grell?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Karl Gottlieb Grell.