astronomy

Tom Brenna

Tom Brenna 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 Tom Brenna rather than just read about it. In short: James Thomas Brenna (born October 15, 1959) is an American scientist specializing in analytical chemistry, mass spectrometry, and in human nutrition and foods, specifically fats. He is a professor of Pediatrics and chemistry at Dell Medical School, having previously been a professor of human nutrition, chemistry, chemical biology and food science at Cornell University.

Key takeaways

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

Reference excerpt

James Thomas Brenna (born October 15, 1959) is an American scientist specializing in analytical chemistry, mass spectrometry, and in human nutrition and foods, specifically fats. He is a professor of Pediatrics and chemistry at Dell Medical School, having previously been a professor of human nutrition, chemistry, chemical biology and food science at Cornell University.

Career

Floyd Landis trials Brenna was the key expert witness in the action of the United States Anti-Doping Agency (USADA) against 2006 Tour de France first place finisher Floyd Landis, adjudicated in a hearing of the Tribunal Arbitral du Sport/Court for Arbitration in Sport held in Malibu, California. He testified to the accuracy of Carbon Isotope Ratio (CIR) tests conducted by the French Antidoping laboratory at Châtenay-Malabry. Landis conducted a high profile, multimillion dollar defense but lost the 2007 original hearing with the decision relying for technical opinion on Brenna’s testimony. Landis later lost a 2008 de novo case before the American Arbitration Association also relying on Brenna’s testimony and was stripped of his title. Years later Landis revealed he was doping and filed a whistle-blower lawsuit under the federal False Claims Act against Lance Armstrong that was settled with multimillion dollar payments by Armstrong.

DHA in Infant Formula Brenna visited the FDA infant formula team in late 2001 to encourage omega-3 docosahexaenoic acid (DHA) to be included in infant formula. A few weeks later the FDA issued its “no questions” letter accepting this suggestion and citing his work.

Dietary Guidelines Advisory Committee Brenna was a member of the Dietary Guidelines Advisory Committee advising on the 2015 U.S. Dietary Guidelines for Americans. He was one of four members of the Food Sustainability and Safety subcommittee whose work on sustainability was excluded from consideration by an act of Congress.

Coconut oil Comments in the New York Times about the healthfulness of coconut oil in late 2015 were covered in 200+ newspapers globally. Brenna opined that 21st-century virgin coconut oil does not cause heart disease but that earlier coconut oils may cause heart disease due to process contaminants.

Vegetarian gene In 2016 he was co-lead of a team that discovered an insertion-deletion polymorphism, rs66698963, is under positive selective pressure depending on whether ancestral diets were primarily animal/seafood-based or plant-based. Global news widely reported that it would lead to potentially greater risk of disease, though this was corrected later.

References

Worked examples

Example 1 — a first encounter with Tom Brenna

Start with the simplest possible case. Write down what Tom Brenna 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 Tom Brenna 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 Tom Brenna 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 Tom Brenna

In research: Tom Brenna 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 Tom Brenna 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: Tom Brenna is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1959 births, Analytical chemists, Cornell University alumni, so understanding it makes those chapters shorter.
In everyday life: Look for Tom Brenna 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 Tom Brenna in 20 minutes

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

Frequently asked questions

What is Tom Brenna in simple terms?

Why does Tom Brenna 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 Tom Brenna?

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 Tom Brenna.