chemistry

Ragna Rask-Nielsen

Ragna Rask-Nielsen 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 Ragna Rask-Nielsen rather than just read about it. In short: Ragna Marie Jenny Rask-Nielsen née Jensen (1900–1998) was a Danish biochemist and medical researcher. After she earned a PhD with a dissertation on the development of carcinogenic tumors in mice in 1948, she carried out laboratory-based studies on antibody-producing tumors.

Key takeaways

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

Reference excerpt

Ragna Marie Jenny Rask-Nielsen née Jensen (1900–1998) was a Danish biochemist and medical researcher. After she earned a PhD with a dissertation on the development of carcinogenic tumors in mice in 1948, she carried out laboratory-based studies on antibody-producing tumors. In 1963, her groundbreaking work on viruses causing cancerous lymphoma was published in the journal Nature. When she died at the age of 97, she left her large fortune to a research foundation.

Biography Born on 15 September 1900 in Skive, Denmark, Jutland, Ragna Marie Jenny Jensen was the daughter of the merchant Emil Carl Jensen (1874–1948) and his wife Anna née Hansen (1872–1929). In October 1923 she married the specialist physician Hans Christian Rask-Nielsen (1896–1928). The marriage was dissolved in 1944. An only child, she was brought up in a well-to-do home by parents who supported her educational aspirations. Her father was the brother of the Nobel prize winner Johannes V. Jensen and the women's rights activist Thit Jensen. After graduating from high school, she began to read medicine at the University of Copenhagen in 1919 but interrupted her studies when she married in 1923. She then devoted her attention to assisting her husband Hans Rask-Nielsen with his dissertation for a medical doctorate. Thereafter she helped him enthusiastically with his animal experiments, although the results were published only in his name. Despite being upset by the divorce in 1944, Rask-Nielsen continued her studies, specializing in biology and graduating in 1945. She became an assistant at the university's Biological Institute, continued her experiments and published the results in her own name. Thanks to the support she received from her professor, the nutritionist Richard Ege, who understood her potential, she earned her doctorate in 1948 with a dissertation titled On the Development of Tumors in Various Tissues in Mice, Following Direct Application of a Carcinogenic Hydrocarbon. Rask-Nielsen continued to conduct experimental leukemia research in the university's biology department, concentrating on anti-body producing tumors. She developed international contacts and made study trips to London and the United States. In 1963, the journal Nature published research showing that she was the first to prove the existence of viruses causing lymph node cancer in experiments with animals. In 1975, she received world recognition for her work when she was featured in the journal Cancer Research as one of the two European women who had had the greatest impact on basic medical-biological research in the 20th century. Ragna Rask-Nielsen died in Copenhagen on 19 May 1998.

References

Worked examples

Example 1 — a first encounter with Ragna Rask-Nielsen

Start with the simplest possible case. Write down what Ragna Rask-Nielsen 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 Ragna Rask-Nielsen 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 Ragna Rask-Nielsen 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 Ragna Rask-Nielsen

In research: Ragna Rask-Nielsen 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 Ragna Rask-Nielsen 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: Ragna Rask-Nielsen is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1900 births, 1998 deaths, 20th-century women biochemists, so understanding it makes those chapters shorter.
In everyday life: Look for Ragna Rask-Nielsen 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 Ragna Rask-Nielsen in 20 minutes

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

Frequently asked questions

What is Ragna Rask-Nielsen in simple terms?

Why does Ragna Rask-Nielsen 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 Ragna Rask-Nielsen?

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 Ragna Rask-Nielsen.