chemistry

Pierre Paul Dehérain

Pierre Paul Dehérain 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 Pierre Paul Dehérain rather than just read about it. In short: Pierre Paul Dehérain (19 April 1830 in Paris – 7 December 1902) was a French plant physiologist and agricultural chemist. He was notably the doctoral advisor of the Nobel Prize winner Henri Moissan.

Key takeaways

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

Reference excerpt

Pierre Paul Dehérain (19 April 1830 in Paris – 7 December 1902) was a French plant physiologist and agricultural chemist. He was notably the doctoral advisor of the Nobel Prize winner Henri Moissan. He served as an assistant at the Conservatoire national des arts et métiers in Paris, then at the age of 26, began work as a professor at the Collège Chaptal. He obtained his LSc degree in 1856 under Edmond Frémy. Later on, he taught classes in agricultural chemistry at the agricultural school in Grignon, and in 1880, became a professor of plant physiology at the Muséum d'Histoire Naturelle. In 1887 he was elected a member of the Académie des sciences. As a plant physiologist, he studied the absorption of carbon dioxide by plants and the effect of artificial light, especially ultraviolet rays, on plants. He showed that plants do not absorb only those minerals that are beneficial, as previously thought, but absorb all of them and then use those that they need – so that consumption regulates absorption. He discovered respiration by plant roots and investigated the effect of different minerals on the growth of fruits. He also studied effect of crop rotation on soil quality. The plant genus Deherainia from the family Theophrastaceae is named after him.

Selected works Recherches sur l'emploi agricole des phosphates, 1859 – Research on the agricultural use of phosphates. Cours de chimie agricole, professé à L'École d'agriculture de Grignon, 1873 – Agricultural chemistry courses taught at the School of Agriculture at Grignon. Traité de chimie agricole : développement des végétaux, terre arable, amendements et engrais, 1892 – Agricultural chemistry treatise: Development of plants, topsoil, modifications and fertilizers. Les plantes de grande culture, 1898 – Field crops.

References Dictionnaire de Biographie Francaise, Libraire Letouzey et Ane: 1933-1989, vol. 10, col 565-566. Soc. d'Hist. Nat. d'Autun, 1903, 16, pp. 28-48. Revue Gen. Sci., 1894, 5, pp. 139-140.

External links Works by or about Pierre Paul Dehérain at the Internet Archive

Illustrations

Worked examples

Example 1 — a first encounter with Pierre Paul Dehérain

Start with the simplest possible case. Write down what Pierre Paul Dehérain 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 Pierre Paul Dehérain 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 Pierre Paul Dehérain 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 Pierre Paul Dehérain

In research: Pierre Paul Dehérain 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 Pierre Paul Dehérain 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: Pierre Paul Dehérain is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1830 births, 1902 deaths, 19th-century French botanists, so understanding it makes those chapters shorter.
In everyday life: Look for Pierre Paul Dehérain 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 Pierre Paul Dehérain in 20 minutes

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

Frequently asked questions

What is Pierre Paul Dehérain in simple terms?

Why does Pierre Paul Dehérain 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 Pierre Paul Dehérain?

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 Pierre Paul Dehérain.