Posts Tagged ‘immunology’
“To be overly concerned with the original materials, which are merely sentimental souvenirs of the past, is to fail to see the living building itself”*…
The human body replaces its own cells regularly. Scientists at the Weizmann Institute of Science in Rehovot, Israel, have finally pinned down the speed and extent of this “turnover.” About a third of our body mass is fluid outside of our cells, such as plasma, plus solids, such as the calcium scaffolding of bones. The remaining two thirds is made up of roughly 30 trillion human cells. About 72 percent of those, by mass, are fat and muscle, which last an average of 12 to 50 years, respectively. But we have far more, tiny cells in our blood, which live only three to 120 days, and lining our gut, which typically live less than a week. Those two groups therefore make up the giant majority of the turnover. About 330 billion cells are replaced daily, equivalent to about 1 percent of all our cells. In 80 to 100 days, 30 trillion will have replenished—the equivalent of a new you…
Our Bodies Replace Billions of Cells Every Day: “A New You in 80 Days.”
* Douglas Adams, Last Chance to See
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As we sail on the Ship of Theseus, we might spare a thought for Hans Ernst August Buchner; he died on this date in 1902. A bacteriologist, he was a pioneer in the field of immunology, the first to discover a substance in blood, gamma globulins, natural bactericides capable of destroying bacteria. He also worked with his brother Eduard Buchner, a chemist who won the Nobel Prize in 1907 for his work on fermentation (which helped pave the way for our understanding of the work of enzymes); Ernst had died in 1902, and so did not share in the honor.
“Thought is an infection. In the case of certain thoughts, it becomes an epidemic.”*…
Frank M. Snowden, a professor emeritus of history and the history of medicine at Yale, examines the ways in which disease outbreaks have shaped politics, crushed revolutions, and entrenched racial and economic discrimination. Epidemics have also altered the societies they have spread through, affecting personal relationships, the work of artists and intellectuals, and the man-made and natural environments. Gigantic in scope, stretching across centuries and continents, Snowden’s account seeks to explain, too, the ways in which social structures have allowed diseases to flourish. “Epidemic diseases are not random events that afflict societies capriciously and without warning,” he writes. “On the contrary, every society produces its own specific vulnerabilities. To study them is to understand that society’s structure, its standard of living, and its political priorities.”…
Epidemics as a mirror for humanity- Isaac Chotiner (@IChotiner) interviews Frank Snowden: “How Pandemics Change History,” conducted on the occasion of the publication of Snowden’s new book, Epidemics and Society: From the Black Death to the Present.
See also: “Late-Stage Pandemic Is Messing With Your Brain.”
And for thoughts on addressing the issues raised, see “Governing In The Planetary Age.”
* Wallace Stevens
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As we reflect, we might spare thought for August Paul von Wassermann; he died on this date in 1925. A bacteriologist and hygienist, he was director of the Institute for Infectious Diseases in Berlin, where he developed (in 1906) a universal blood-serum test for syphilis that helped extend the basic tenets of immunology to diagnosis. “The Wassermann reaction,” in combination with other diagnostic procedures, is still employed as a reliable indicator for the disease. He also he developed inoculations against cholera, typhoid, and tetanus.
“Francie, huddled with other children of her kind, learned more that first day than she realized. She learned of the class system of a great Democracy.”*…
Engraving from a series of images titled “The Great Yellow Fever Scourge — Incidents Of Its Horrors In The Most Fatal District Of The Southern States.”
Some people say New Orleans is haunted because of witches. Others say it’s haunted by vampires, or ghosts, or all those swamps. But if you were around between 1817 and 1905, you might say the city was haunted by death. And that death, in large part, was caused by yellow fever.
Yellow fever was fatal. It was gruesome. And in epidemic years, during the months between July and October, it could wipe out 10 percent of the city’s population. Eventually, it earned New Orleans the nickname “Necropolis” — city of the dead.
Yellow fever didn’t just kill. It created an entire social structure based on who had survived the virus, who was likely to survive it and who was not long for this world. And that structure had everything to do with immigration and slavery…
The insidious way in which illness can shape society: “How Yellow Fever Turned New Orleans Into The ‘City Of The Dead‘.”
A Tree Grows in Brooklyn
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As we get our flu shots, we might send healing birthday greetings to Florence Rena Sabin; she was born on this date in 1871. A pioneer for women in science; she was the first woman to hold a full professorship at Johns Hopkins School of Medicine, the first woman elected to the National Academy of Sciences, and the first woman to head a department at the Rockefeller Institute for Medical Research. Relevantly to today’s post, at Rockefeller she founded the cellular immunology section, where she researched the body’s white blood cells reaction to tuberculosis infection.
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