# News tagged with entropy

Genetics

## How random processes and epigenetics can explain why tumor cells shapeshift, metastasize and resist treatments

Cancer is often seen as a disease that arises from genetic mutations causing cells to divide uncontrollably and invade other parts of the body. But the spread of cells away from their origins is actually a normal process ...

Oncology & Cancer

## Could mathematics help to better treat cancer?

The development and survival of living beings are linked to the ability of their cells to perceive and respond correctly to their environment. To do this, cells communicate through chemical signal systems, called signalling ...

Neuroscience

## Brain imaging helps redefine intelligence

High-tech scans of the resting human brain can provide a new way to define and interpret the brain's actual mental capacity, new research suggests.

Neuroscience

## Technique helps predict likelihood of migraines in concussion patients

Researchers are using a mathematical tool to help determine which concussion patients will go on to suffer migraine headaches, according to a new study published online in the journal Radiology.

## Entropy

Entropy is a concept applied across physics, information theory, mathematics and other branches of science and engineering. The following definition is shared across all these fields:

where S is the conventional symbol for entropy. The sum runs over all microstates consistent with the given macrostate and is the probability of the ith microstate. The constant of proportionality k depends on what units are chosen to measure S. When SI units are chosen, we have k = kB = Boltzmann's constant = 1.38066×10−23 J K−1. If units of bits are chosen, then k = 1/ln(2) so that .

Entropy is central to the second law of thermodynamics. The second law in conjunction with the fundamental thermodynamic relation places limits on a system's ability to do useful work.

The second law can also be used to predict whether a physical process will proceed spontaneously. Spontaneous changes in isolated systems occur with an increase in entropy.

The word "entropy" is derived from the Greek εντροπία "a turning towards" (εν- "in" + τροπή "a turning").

This text uses material from Wikipedia, licensed under CC BY-SA