biology

Henning Eiler Petersen

Henning Eiler Petersen is a biology 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 Henning Eiler Petersen rather than just read about it. In short: Henning Eiler (Ejler) Petersen (22 August 1877 – 22 May 1946) was a Danish mycologist, botanist and marine biologist. He made a major contribution to unveiling the mysterious die-back of eel grass in Northern European waters in the early 20th century as a pathogen outbreak.

Key takeaways

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

Reference excerpt

Henning Eiler (Ejler) Petersen (22 August 1877 – 22 May 1946) was a Danish mycologist, botanist and marine biologist. He made a major contribution to unveiling the mysterious die-back of eel grass in Northern European waters in the early 20th century as a pathogen outbreak. Petersen's main research was in what was then known as lower fungi – Chytridiomycota and Oomycetes, but he also studied the systematics of Red algae. Parallel to these lines of research, he investigated the intraspecific morphological variation in plant species – which would today be called quantitative genetics. The Oomycete genus Petersenia is named to his honour.

Selected scientific bibliography Petersen, H.E. (1903) Notes sur les Phycomycètes observés dans les téguments vides des nymphes de Phryganées avec description de trios espèces nouvelles de Chytridinées. Journal de Botanique 17 (6–7): 214–222. Petersen, H.E. (1905) Contributions à la connaissance des Phycomycètes marins (Chrytridinæ Fischer). Oversigt over det Kongelige Danske Videnskabernes Selskabs Forhandlinger 1905 (5): 439–488 Petersen, H.E. (1908) Danske Arter af Slægten Ceramium (Roth) Lyngbye [with French summary]. Kongelige Danske Videnskabernes Selskabs Skrifter - Naturvidenskabelig og Mathematisk Afdeling, 7.Rk., vol. 5 (2). Petersen, H.E. (1908) The structure and biology of Arctic flowering plants (ed. E. Warming. 1. Ericinæ (Ericaceae, Pirolaceae). 2. The biological anatomy of them leaves and stems. Meddelelser om Grønland 36: 73–138. Petersen, H.E. (1908) The structure and biology of Arctic flowering plants (ed. E. Warming. 2. Diapensiaceae. Diapensia lapponica. Meddelelser om Grønland 36: 139–154. Petersen, H.E. (1910) An account of Danish freshwater Phycomycetes, with biological and systematical remarks. Annales Mycologici 8: 494–560. Ostenfeld, C.H. & Petersen, H.E. (1930) On a new Plasmodiophoracea found in Canada. Zeitschrift für Botanik 23: 13–18. Petersen, H. E. (1915) Indledende Studier over Polymorfien hos Anthriscus silvestris (L.) Hoffm. Dansk Botanisk Arkiv 1: 1–150. Petersen, H.E. (1924) Studier over Polymorphien hos Vaccinium uliginosum. Botanisk Tidsskrift 38 (3). Petersen, H.E. (1921) Nogle Studier over Pimpinella saxifraga L. Botanisk Tidsskrift 37: 222–240. Petersen, H.E. (1922) Études ultérieures sur la polymorphie de l'Anthriscus silvester (L.) Hoffm. Dansk Botanisk Arkiv 4: 1–28. Petersen, H.E. (1926) Über die Variation der Potentilla erecta (L.) Dalla Torre. Botanisk Tidsskrift 39: 368–374. Petersen, H.E. (1933) Wasting disease in eel grass (Zostera marina). Nature 134: 143–144. Petersen, H.E. (1935) Preliminary report on the disease of eel-grass (Zostera marina L.). Report from the Danish Biological Station 40: 3–8.

References

Worked examples

Example 1 — a first encounter with Henning Eiler Petersen

Start with the simplest possible case. Write down what Henning Eiler Petersen claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Henning Eiler Petersen 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 Henning Eiler Petersen 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 Henning Eiler Petersen

In research: Henning Eiler Petersen appears in biology 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 Henning Eiler Petersen 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: Henning Eiler Petersen is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1877 births, 1946 deaths, 20th-century Danish botanists, so understanding it makes those chapters shorter.
In everyday life: Look for Henning Eiler Petersen 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 Henning Eiler Petersen in 20 minutes

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

Frequently asked questions

What is Henning Eiler Petersen in simple terms?

Why does Henning Eiler Petersen matter?

Because it connects several biology 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 Henning Eiler Petersen?

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 Henning Eiler Petersen.