chemistry

Johann Frederik Eijkman

Johann Frederik Eijkman is a chemistry 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 Johann Frederik Eijkman rather than just read about it. In short: Johan Fredrik Eykman or Johann Frederik Eijkman (19 January 1851 – 7 January 1915) was a Dutch chemist. Family background He is one of the eight children of Christiaan Eijkman, the headmaster of a local school, and Johanna Alida Pool.

Key takeaways

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

Reference excerpt

Johan Fredrik Eykman or Johann Frederik Eijkman (19 January 1851 – 7 January 1915) was a Dutch chemist.

Family background He is one of the eight children of Christiaan Eijkman, the headmaster of a local school, and Johanna Alida Pool. His brother Christiaan Eijkman (1858–1930) was a physician and professor of physiology whose demonstration that beriberi is caused by poor diet led to the discovery of vitamins. Together with Sir Frederick Hopkins, his brother received the Nobel Prize for Physiology or Medicine.

Life in Japan He was hired during the Meiji period, a Japanese era which extended from September 1868 through July 1912. During his stay in Japan, he was the first to isolate shikimic acid in 1885 from the Japanese flower shikimi (シキミ, the Japanese star anise, Illicium anisatum).

Works

1883 : "Phytochemische Notizen ueber einige Japanische Pflanzen"

References

Notice sur la vie et l'oeuvre scientifique Johan Frederik Eykman. Recueil des Travaux Chimiques des Pays-Bas et de la Belgique, 1916, Volume 35, Issue 11-12, pages 365–411, doi:10.1002/recl.19160351102 Johan Frederik Eykman—A physical chemist. van Klooster H. S., Journal of Chemical Education, volume 28, issue 12, page 616, doi:10.1021/ed028p616

External links

Illustrations

Johann Frederik Eijkman: "Phytochemische Notizen ueber einige Japanische Pflanzen" — "Phytochemische Notizen ueber einige Japanische Pflanzen"

Worked examples

Example 1 — a first encounter with Johann Frederik Eijkman

Start with the simplest possible case. Write down what Johann Frederik Eijkman claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, 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 Johann Frederik Eijkman 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 Johann Frederik Eijkman 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 Johann Frederik Eijkman

In research: Johann Frederik Eijkman appears in chemistry 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 Johann Frederik Eijkman 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: Johann Frederik Eijkman is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1851 births, 1915 deaths, 19th-century Dutch chemists, so understanding it makes those chapters shorter.
In everyday life: Look for Johann Frederik Eijkman 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 Johann Frederik Eijkman in 20 minutes

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

Frequently asked questions

What is Johann Frederik Eijkman in simple terms?

Johan Fredrik Eykman or Johann Frederik Eijkman (19 January 1851 – 7 January 1915) was a Dutch chemist. Family background He is one of the eight children of Christiaan Eijkman, the headmaster of a local school, and Johanna Alida Pool.

Why does Johann Frederik Eijkman matter?

Because it connects several chemistry 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 Johann Frederik Eijkman?

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 Johann Frederik Eijkman.