astronomy

Leonard Machlis

Leonard Machlis is a astronomy 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 Leonard Machlis rather than just read about it. In short: Leonard Machlis (April 13, 1915 – March 26, 1976) was an American botanist. He was best known for his research on plant hormones involved in sexual reproduction.

Key takeaways

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

Reference excerpt

Leonard Machlis (April 13, 1915 – March 26, 1976) was an American botanist. He was best known for his research on plant hormones involved in sexual reproduction. He was the editor of the Annual Review of Plant Physiology from 1959 to 1972 and received a Guggenheim Fellowship in 1957.

Early life and education Leonard Machlis, who went by "Len", was born on April 13, 1915 in Seattle, Washington to parents Beatrice and Samuel, both immigrants from Russia. He had two younger siblings, Miriam and Jack. He first attended Washington State University, graduating in 1937. Next, he went to the University of Hawaiʻi to complete a master's degree with Harry Clements, followed by a PhD at the University of California. Berkeley under Dennis Robert Hoagland in 1943.

Career Machlis's early career was spent on war-related projects. He first worked for the U.S. Department of Agriculture for propagation of guayule plants for rubber production. Next, he worked on a guided missile project. After the war's conclusion, he briefly taught botany at the University of Illinois before accepting a position at University of California, Berkeley in 1946. There, he researched the nutrition of fungi, as well as chemical signalling between fungi gametes. He and Berkeley colleague Henry Rapoport discovered sirenin, which was "the first-known lower plant sex hormone or pheromone". He was made the chair of the botany department in 1962, and remained thus until 1968. He was the editor of the Annual Review of Plant Physiology (now the Annual Review of Plant Biology) from 1959–1972.

Awards and honors Machlis received a Guggenheim Fellowship in 1957 in the field of plant sciences.

Personal life and death He met Gertrude Therese née Rafferty while he was at the University Illinois; they married in 1946. Gertrude had a doctorate in anatomy and physiology. After they moved to California, she taught at Mills College. They had four children together. He died on March 26, 1976, at his home in Berkeley, California.

References

Worked examples

Example 1 — a first encounter with Leonard Machlis

Start with the simplest possible case. Write down what Leonard Machlis claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, 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 Leonard Machlis 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 Leonard Machlis 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 Leonard Machlis

In research: Leonard Machlis appears in astronomy 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 Leonard Machlis 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: Leonard Machlis is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1915 births, 1976 deaths, 20th-century American botanists, so understanding it makes those chapters shorter.
In everyday life: Look for Leonard Machlis 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 Leonard Machlis in 20 minutes

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

Frequently asked questions

What is Leonard Machlis in simple terms?

Leonard Machlis (April 13, 1915 – March 26, 1976) was an American botanist. He was best known for his research on plant hormones involved in sexual reproduction.

Why does Leonard Machlis matter?

Because it connects several astronomy 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 Leonard Machlis?

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 Leonard Machlis.