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David J Glass MD Profile
David J Glass MD

@davidjglassMD

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Book: Experimental Design for Biologists. Journal: Skeletal Muscle. Focus areas: Aging; Muscle. Works for a biotech company; views are mine.

New York
Joined December 2013
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@davidjglassMD
David J Glass MD
17 days
We found that most published RNAseq studies may be underpowered: Optimized murine sample sizes for RNAsequencing studies revealed from large scale comparative analysis https://t.co/0xKPaRGe18
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@davidjglassMD
David J Glass MD
27 days
At King's, she did the experimental work resulting in both the pictures and HER subsequent calculations that were used to determine DNA's structure. You can debate whether she independently got there, but you can't debate that her data got people there.
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@davidjglassMD
David J Glass MD
27 days
People here lazily fit the Rosalind Franklin defense into a critique of "woke-ness." Franklin was a world-class X-ray diffraction expert before King's. After, she trained Krug; their work on the TMV virus catalyzed his work which later won another Nobel prize. He gave her credit
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@davidjglassMD
David J Glass MD
27 days
Highlighting this anti-semitism so people can see what I'm seeing. It's eye-opening to realize this is still the way some people view the world - through prejudice.
@DBlossius
Blossius
27 days
@davidjglassMD @doodlestein This thread only lacked the ethnocentric Jew bounding in to give credit for a scientific discovery to a co-ethnic of his...
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@davidjglassMD
David J Glass MD
27 days
The biggest problem for me with the Watson & Crick paper is that they did zero experiments, literally lied that they saw Franklin's experimental data, and thus set themselves up as these supposed geniuses who intuited the structure of DNA from thin air. I'd retract their paper.
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@davidjglassMD
David J Glass MD
27 days
I thought this biography of Rosalind Franklin was quite interesting: https://t.co/9UNfzqRZFu
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harpercollins.com
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@davidjglassMD
David J Glass MD
27 days
Her parameters strongly constrained the possible models for DNA (requiring paired, antiparallel chains). Crick later acknowledged seeing this report. I don't think even scientists today understand how much W&C lifted from her without attribution. It wasn't just a photo.
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@davidjglassMD
David J Glass MD
27 days
In her biography, the author cites the 1952 MRC report from King’s College DNA group. That internal report summarized Franklin’s key calculations—including the 34 Å repeat and C2 space group symmetry, showing she fully realized that DNA was a double helix.
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@davidjglassMD
David J Glass MD
27 days
By now, it seems most historians agree that Watson & Crick used Franklin's data without her knowledge. The details of the structure were made possible using her calculations. Just consider their claim of ignorance of her work in the body of the paper versus what they wrote later
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@davidjglassMD
David J Glass MD
28 days
It's worth reading the Watson & Crick paper. Note this part: "We were not aware of the details of the results presented [in the Franklin paper] when we devised our structure" That statement was contradicted in the Acknowledgement, and in detail later https://t.co/SP4IgVqJno
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nature.com
Nature - The determination in 1953 of the structure of deoxyribonucleic acid (DNA), with its two entwined helices and paired organic bases, was a tour de force in X-ray crystallography. But more...
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@davidjglassMD
David J Glass MD
3 months
Don't write something in a review that you wouldn't appreciate reading from a reviewer. I don't care if you've been traumatized by prior hostile reviewers. Be better.
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@davidjglassMD
David J Glass MD
4 months
The Reverend Bayes' original example was figuring out how close a billiard ball was to a line on the pool table. You can posit multiple potential possibilities, assigning priors to each; the data updates your priors, getting you to reality. There's no binary "yes/no" involved.
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@davidjglassMD
David J Glass MD
5 months
Scientists who argue that aging isn't programmed need to explain how you get a 6-fold difference in lifespan between rats and squirrels (both rodents; both the same size, etc) without programming. Or consider budgies vs african grey parrots - 5 to 6 fold difference in lifespan.
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@davidjglassMD
David J Glass MD
5 months
Another feature of a query-based experimental framework is that it eliminates the "positive vs negative" data binary. If your data answers the question you've posed, it's simply data - neither positive nor negative. This significantly decreases the incentive to cherry-pick.
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@davidjglassMD
David J Glass MD
7 months
If you frame an experiment with a hypothesis or expectation, and then set out to test that claim, you're always at risk of both confirmation bias and, even worse, establishing a system only capable of finding what you're looking for. Framing with a question forces a wide net.
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@davidjglassMD
David J Glass MD
5 months
As to "why do we age?" I don't find "why" questions very helpful. The fact is we do age, in a reproducible manner. If aging weren't programmed, we wouldn't see reproducible gene expression changes at specific times throughtout life. We'd break down randomly - like a car.
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@davidjglassMD
David J Glass MD
5 months
I guess the most straightforward evidence that aging is programmed is that related species have different, but reproducible lifespans. Rats live around 2.5 years. Squirrels can live 15 years. Both are rodents, similarly sized, but there's a reproducible 6x difference in lifespan
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@davidjglassMD
David J Glass MD
5 months
Here is one thing I think I understand about aging, which is pretty amazing: aging is programmed. We've performed aging gene signatures - assessing changes in gene expression with age via RNAseq - and you see the same changes happening at the same time in the same tissues.
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@davidjglassMD
David J Glass MD
5 months
Below is a non-serious statement, and an example as to why the Aging field is at risk of being pulled into a vat of snake oil.
@davidasinclair
David Sinclair
5 months
5 minutes in a sauna 4x/week reduces cardiovascular risk by 50%
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