biology

Hans Ris

Hans Ris 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 Hans Ris rather than just read about it. In short: Hans Ris (June 15, 1914 – November 19, 2004) was an American cytologist and pioneer electron microscopist. His studies of chromosome structure revealed the importance of non-histone proteins, and along with evolutionary biologist Lynn Margulis, he was one of the first to recognize that blue-green algae were a special type of bacteria.

Key takeaways

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

Reference excerpt

Hans Ris (June 15, 1914 – November 19, 2004) was an American cytologist and pioneer electron microscopist. His studies of chromosome structure revealed the importance of non-histone proteins, and along with evolutionary biologist Lynn Margulis, he was one of the first to recognize that blue-green algae were a special type of bacteria. He coined the term genophore for prokaryote DNA to highlight its differences from the eukaryal chromosome. Ris was a founding member of the American Society for Cell Biology and received the Distinguished Scientist Award by the Microscopy Society of America in 1983.

Biography Hans Ris was born in Bern, Switzerland on 15 June 1914, where he also grew up. Inspired by the works of the French entomologist Jean Henri Fabre, he observed the habits of ants, wasps and bees. He came to America in 1938 to work with B.H. Willier at Rochester, New York. After receiving his doctorate at Columbia University he moved to Johns Hopkins and later to the laboratory of Alfred Mirsky at Rockefeller University, where he studied the structure of chromosomes. He then went to the zoology department of the University of Wisconsin-Madison in 1949, where he started to work with electron microscopes. In 1972 he established the High Voltage Electron Microscopy (HVEM) laboratory within the University of Wisconsin-Madison. He retired at age 75, but remained Emeritus Investigator of the University of Wisconsin’s Integrated Microscopy Resource (IMR) and continued to work on high-resolution images of the nuclear pore complex.

Hans Ris Seminar Series The Laboratory of Optical and Computational Instrumentation (LOCI) in collaboration with the Center for Quantitative Cell Imaging at the University of Wisconsin-Madison hosts an annual seminar series honoring Ris, who oversaw the installation of one of the nation's first high-voltage electron microscopes in the former location of LOCI. Ris remained Emeritus Investigator of the IMR until his death in 2004. Hans Ris Seminar Series Featured Speakers: 2022: Wolfgang Baumeister; Max Planck Institute of Biochemistry 2019: Davi Bock; University of Vermont and Janelia Farms 2018: Tatyana Svitkina; University of Pennsylvania 2017: Erik M. Jorgensen Archived 2019-05-06 at the Wayback Machine; University of Utah 2016: David H. Hall Archived 2018-07-15 at the Wayback Machine; Albert Einstein College 2015: Kent McDonald Archived 2017-11-13 at the Wayback Machine; UC Berkeley 2014: Wah Chiu; Baylor College of Medicine 2013: Thomas Müller-Reichert; Technische Universität Dresden 2012: Mark E. Ellisman Archived 2018-07-19 at the Wayback Machine; UC San Diego

Selected works Mirsky, A. E., and Hans Ris. "Variable and constant components of chromosomes." Nature 163.4148 (1949): 666-666. Mirsky, A. E., and Hans Ris. "The desoxyribonucleic acid content of animal cells and its evolutionary significance." The Journal of general physiology 34.4 (1951): 451. Peterson, JOAN B., and Hans Ris. "Electron-microscopic study of the spindle and chromosome movement in the yeast Saccharomyces cerevisiae." Journal of cell science 22.2 (1976): 219-242.

References

External links Memorial Resolution of the faculty of the University of Wisconsin-Madison Archived 2017-02-02 at the Wayback Machine microscopy.wisc.edu/hansris Hans Ris – from chromatin fibres, through nuclear tracks, to nuclear pores Electron Microscopy image of female chromosome by H. Ris

Worked examples

Example 1 — a first encounter with Hans Ris

Start with the simplest possible case. Write down what Hans Ris 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 Hans Ris 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 Hans Ris 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 Hans Ris

In research: Hans Ris 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 Hans Ris 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: Hans Ris is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1914 births, 2004 deaths, 20th-century American biologists, so understanding it makes those chapters shorter.
In everyday life: Look for Hans Ris 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 Hans Ris in 20 minutes

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

Frequently asked questions

What is Hans Ris in simple terms?

Why does Hans Ris 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 Hans Ris?

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 Hans Ris.