astronomy

Marshall Conring Johnston

Marshall Conring Johnston 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 Marshall Conring Johnston rather than just read about it. In short: Marshall Conring Johnston (born May 10, 1930) is an American botanist who made several explorations in Mexico and specialized in plants in the family Gesneriaceae and Rhamnaceae. Johnston was born in San Antonio in the family of Theodore Harris Johnston and Lucile Mary Conring.

Key takeaways

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

Reference excerpt

Marshall Conring Johnston (born May 10, 1930) is an American botanist who made several explorations in Mexico and specialized in plants in the family Gesneriaceae and Rhamnaceae. Johnston was born in San Antonio in the family of Theodore Harris Johnston and Lucile Mary Conring. He went on his first botanical expeditions to Mexico while still in high school during 1945–1947. On those trips he visited the northern Mexican states of Tamaulipas, Nuevo Leon, Coahuila, Durango, and Zacatecas. From 1972–1974 he made trips to Chihuahua, concentrating on desert flora. These early 1970s trips resulted in the bulk of his botanic collection. Marshal participated in the creation of the books Flora of Texas, Flora of North America, and Flora Neotropica. Johnston was also a professor at the University of Texas at Austin.

Plant namesakes Marshalljohnstonia (genus), Henrickson, 1976 Colubrina johnstonii, T.Wendt, 1983 Crataegus johnstonii, J.B.Phipps, 1997 Euphorbia johnstonii, Mayfield, 1991 Frankenia johnstonii, Correll, 1966 Hedeoma johnstonii, R.S.Irving, 1977 Karwinskia johnstonii, R.Fernández, 1988 Matelea johnstonii, Shinners, 1964 Nerisyrenia johnstonii, J.D.Bacon, 1978 Phacelia marshall-johnstonii, N.D.Atwood & Pinkava, 1977 Portulaca johnstonii, Henrickson, 1981 Johnstonalia, Tortosa, 2006

Works Correll, D. S.; Johnston, M. C. (1970). Manual of the Vascular Plants of Texas. College Station, TX: Texas Research Foundation. Cheatham, Scooter; Johnston, M. C.; Marshall, Lynn (1995). The Useful Wild Plants of Texas, the Southeastern and Southwestern United States, the Southern Plains, and Northern Mexico. Austin, TX: Useful Wild Plants Inc. ISBN 978-1-8872-9201-6. Johnston, L. A.; Johnston, M. C. (1999). Rhamnus. New York: New York Botanical Garden. ISBN 978-0-8932-7209-8.

References

External links

Worked examples

Example 1 — a first encounter with Marshall Conring Johnston

Start with the simplest possible case. Write down what Marshall Conring Johnston 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 Marshall Conring Johnston 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 Marshall Conring Johnston 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 Marshall Conring Johnston

In research: Marshall Conring Johnston 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 Marshall Conring Johnston 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: Marshall Conring Johnston is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1930 births, 21st-century American botanists, Living people, so understanding it makes those chapters shorter.
In everyday life: Look for Marshall Conring Johnston 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 Marshall Conring Johnston in 20 minutes

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

Frequently asked questions

What is Marshall Conring Johnston in simple terms?

Why does Marshall Conring Johnston 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 Marshall Conring Johnston?

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 Marshall Conring Johnston.