biology

Sheldon Penman

Sheldon Penman 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 Sheldon Penman rather than just read about it. In short: Sheldon Penman (July 24, 1930 – September 27, 2021) was an American cell biologist whose research focused on cellular architecture and gene expression. Initially trained in physics, he moved into molecular and cell biology and held faculty positions at the University of Chicago, Columbia University, the Albert Einstein College of Medicine, and the Massachusetts Institute of Technology.

Key takeaways

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

Reference excerpt

Sheldon Penman (July 24, 1930 – September 27, 2021) was an American cell biologist whose research focused on cellular architecture and gene expression. Initially trained in physics, he moved into molecular and cell biology and held faculty positions at the University of Chicago, Columbia University, the Albert Einstein College of Medicine, and the Massachusetts Institute of Technology. He was one of the founding editors of the journal Cell in 1974.

Early life and education Penman was born in Philadelphia on July 24, 1930. He received his Ph.D in physics from Columbia University in 1958.

Career Penman held faculty positions in physics at the University of Chicago and Columbia University, before he joined the Albert Einstein College of Medicine in 1961. In 1981, the Whitehead Institute was proposed to be affiliated with MIT as a separate, endowed biomedical research institute, but with shared faculty; The New York Times described Penman as "an archfoe of the terms of Mr. Whitehead's proposal". Penman was one of 33 MIT faculty members who signed a letter expressing concern about the proposed relationship between MIT and the Whitehead Institute. One of Penman's obituaries characterized his opposition as being based on a significant concern that the faculty had about corporate influence in academic science. Penman mentored many students and postdoctoral researchers, including Michael Rosbash, Robert H. Singer, and Zhai Zhonghe.

Research and professional service Penman's early work included theoretical and practical contributions in physics, before his transition to biology. He authored a 1961 article in Scientific American entitled The Muon, describing the state of knowledge at that time about the muon particle. During his transition from physics to biology, Penman and collaborators including William Daniel Phillips applied nuclear magnetic resonance (NMR) to show that nucleic acid secondary structure, hybridization, and melting behavior could be detected in solution, and NMR could be used to assess if the nucleic acid is single-stranded, base-paired, hybridized, or melted. After shifting his focus to biology, he contributed to the first demonstration of messenger RNA in a mammalian cell. He then developed methods for isolating HeLa cell nucleoli and used them to study RNA synthesis in nucleolar and nucleoplasmic domains. This led to a characterization of rRNA biosynthesis and it contributed to an understanding of rRNA processing. Penman's studies of heterogeneous nuclear RNA helped support later work on RNA splicing. With his colleague Robert Weinberg he identified small nuclear RNAs. And with Klaus Scherrer, Yechiel Becker, and James Darnell, Penman described the presence of messenger RNA in polyribosomes. Penman was a founding editor of the journal Cell in 1974.

Honors Penman's honors included the following:

Member of the National Academy of Sciences (1986). Member of the American Academy of Arts and Sciences (1975). Shared the 1994 E. B. Wilson Medal of the American Society for Cell Biology with James Darnell.

Death Penman died September 27, 2021, at age 91 and was survived by his son Joshua.

References

Worked examples

Example 1 — a first encounter with Sheldon Penman

Start with the simplest possible case. Write down what Sheldon Penman 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 Sheldon Penman 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 Sheldon Penman 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 Sheldon Penman

In research: Sheldon Penman 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 Sheldon Penman 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: Sheldon Penman is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1930 births, 2021 deaths, Albert Einstein College of Medicine faculty, so understanding it makes those chapters shorter.
In everyday life: Look for Sheldon Penman 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 Sheldon Penman in 20 minutes

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

Frequently asked questions

What is Sheldon Penman in simple terms?

Why does Sheldon Penman 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 Sheldon Penman?

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 Sheldon Penman.