A physicist at the University of Arkansas has defended the validity of the Stokes-Einstein equation, one of Albert Einstein's most famous equations, as it relates to biology. The research will help scientists better understand antibiotic resistance and the mechanical properties of cancer cells.

Working with proteins in live bacteria, Yong Wang, assistant professor in the Fulbright College of Arts and Sciences, tested the 117-year-old equation, which provided evidence for the reality of atoms and molecules. He found that the famous equation remained valid for explaining how molecules move inside bacteria.

"Bacterial cytoplasm is not a simple soup," Wang said. "Our study showed that it might be more like spaghetti with tomato sauce and meatballs."

Cytoplasm is the crowded and complex material inside bacteria. It has high concentrations of large biological molecules, including millions of proteins, carbohydrates and salts, and all kinds of polymers and filaments, such as DNA and RNA.

Wang found that although Einstein's equation appeared to be off for proteins' motion within live bacteria, it remained valid by taking into account the entangled polymers and filaments inside bacteria.

The so-called Einstein relation - also called the Stokes-Einstein equation - is one of Albert Einstein's major research accomplishments in his "year of miracles," 1905. Explaining the mobility of particles through liquid, the equation has been characterized as a stochastic model for Brownian motion, meaning particles move around randomly because of collisions with surrounding molecules. Most importantly, the theory provided early empirical evidence for the reality of atoms and molecules.

However, over the past two decades, scientists have challenged the theory's validity as it applies to what's inside live cells and bacteria. Wang's study adds to this body of knowledge, helping resolve the current controversy.

More importantly, it provides a foundation for assessing the mechanical properties of cells and bacteria based on the Einstein relation. This should help scientists understand antibiotic resistance of certain microorganisms and the mechanical properties of cancer cells, which differ from than the mechanical properties of normal, healthy cells.

Research Report:Revisiting the Temperature Dependence of Protein Diffusion inside Bacteria: Validity of the Stokes-Einstein Equation

Related Links
University of Arkansas
Understanding Time and Space

Tweet

Thanks for being here; We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain. With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords. Our news coverage takes time and effort to publish 365 days a year. If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceDaily Contributor $5 Billed Once credit card or paypal		SpaceDaily Monthly Supporter $5 Billed Monthly paypal only

Physicists see electron whirlpools for the first time
Boston MA (SPX) Jul 11, 2022
Though they are discrete particles, water molecules flow collectively as liquids, producing streams, waves, whirlpools, and other classic fluid phenomena. Not so with electricity. While an electric current is also a construct of distinct particles - in this case, electrons - the particles are so small that any collective behavior among them is drowned out by larger influences as electrons pass through ordinary metals. But, in certain materials and under specific conditions, such effects fade away, ... read more