chemistry

Rudolf Signer

Rudolf Signer 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 Rudolf Signer rather than just read about it. In short: Rudolf Signer (17 March 1903, Herisau, Switzerland – 1 December 1990, Gümlingen, Switzerland) contributed to the discovery of the DNA double helix. He was a Professor for organic chemistry at the University of Bern from 1935 until 1972.

Key takeaways

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

Reference excerpt

Rudolf Signer (17 March 1903, Herisau, Switzerland – 1 December 1990, Gümlingen, Switzerland) contributed to the discovery of the DNA double helix. He was a Professor for organic chemistry at the University of Bern from 1935 until 1972.

Education Signer was the son of Jakob Signer, a chemical scientist working in the textile industry, and his wife Dorothea Agnes Scherrer. Rudolf Signer went to high school in St. Gallen and matriculated at the ETH Zurich in 1921 to study chemistry, initially in order to become a teacher. In 1927, he graduated with his doctorate under the supervision of Hermann Staudinger. Already in 1926, he had become Wissenschaftlicher Assistent at the University of Fribourg, where he qualified as a professor with a Habilitation.

Career Signer spent 1932–1933 in Uppsala and Manchester on a Rockefeller-scholarship. He became a non-tenured professor for general and inorganic chemistry at the University of Bern in 1935 and was tenured in 1939. He went on to become director of the university's Institute of Chemistry and retired as emeritus in 1972.

Research Signer focused on macromolecular chemistry, in particular with regards to natural products. In 1938 he measured and described the properties of DNA, discovering its thread-like structure. In 1950 Signer produced extraordinarily pure DNA from the thymus of calves, of which he took 15 grams of extraordinarily pure DNA to London. In England he gave it to various scientists, among them Maurice Wilkins, in order to promote research in the field. The analysis of X-ray images of these DNA samples, especially Photo 51 by Raymond Gosling and Rosalind Franklin, allowed James Watson and Francis Crick to discover the double-helix structure of DNA. The remainder of the DNA which Signer brought to England survive today in the collection of King's College, London. Over 250 of Signer's scientific writings were published during his lifetime. The Lavoisier Medal was awarded to him for his scientific work and achievements.

References

External links Center for Oral History. "Rudolf Signer". Science History Institute. Koeppel, Tonja (30 September 1986). Rudolf Signer, Transcript of an Interview Conducted by Tonja Koeppel at Berne, Switzerland on 30 September 1986 (PDF). Philadelphia, PA: The Beckman Center for the History of Chemistry.

Worked examples

Example 1 — a first encounter with Rudolf Signer

Start with the simplest possible case. Write down what Rudolf Signer 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 Rudolf Signer 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 Rudolf Signer 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 Rudolf Signer

In research: Rudolf Signer 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 Rudolf Signer 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: Rudolf Signer is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1903 births, 1990 deaths, 20th-century Swiss chemists, so understanding it makes those chapters shorter.
In everyday life: Look for Rudolf Signer 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 Rudolf Signer in 20 minutes

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

Frequently asked questions

What is Rudolf Signer in simple terms?

Why does Rudolf Signer 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 Rudolf Signer?

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 Rudolf Signer.