astronomy

Johan Jansonius

Johan Jansonius 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 Johan Jansonius rather than just read about it. In short: Johan Nomdo Jansonius (1932 – 2 January 2022) was a Dutch chemist and structural biologist. He spent his career at the Biozentrum University of Basel where he was professor of structural biology between 1973 and 1998.

Key takeaways

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

Reference excerpt

Johan Nomdo Jansonius (1932 – 2 January 2022) was a Dutch chemist and structural biologist. He spent his career at the Biozentrum University of Basel where he was professor of structural biology between 1973 and 1998.

Life Jansonius was born in the Netherlands in 1932. He studied chemistry. Jansonius obtained his PhD from the University of Groningen in 1967 with a thesis titled: "De kristalstructuur van papaïne : een röntgendiffractie-onderzoek met een oplossend vermogen van 4,5 Å". He subsequently was lector of protein structure chemistry at the same university between 1971 and 1973. He was professor of structural biology at the University of Basel between 1973 and 1998 and introduced the field of protein crystallography there. He joined the newly founded Biozentrum University of Basel, of which he later served as chair from 1989 to 1991. He was one of the founders of the field of crystallography in Switzerland. Apart from his work in the field of protein crystallography he performed research on enzymes related to metabolism. Jansonius looked into the vitamin B6 dependent enzymes and their structure-function relationship. He clarified the structure of five of those enzymes. Jansonius also worked on thermophilic enzymes. Jansonius was elected a corresponding member of the Royal Netherlands Academy of Arts and Sciences in 1988. He died on 2 February 2022 in Therwil, Switzerland, aged 89.

References

Worked examples

Example 1 — a first encounter with Johan Jansonius

Start with the simplest possible case. Write down what Johan Jansonius 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 Johan Jansonius 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 Johan Jansonius 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 Johan Jansonius

In research: Johan Jansonius 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 Johan Jansonius 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: Johan Jansonius is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1932 births, 2022 deaths, 20th-century Dutch chemists, so understanding it makes those chapters shorter.
In everyday life: Look for Johan Jansonius 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 Johan Jansonius in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Johan Jansonius 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 Johan Jansonius out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Johan Jansonius in simple terms?

Why does Johan Jansonius 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 Johan Jansonius?

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 Johan Jansonius.