4:00 Photo Credit: Amina Bouslimani and Neha GargWe leave behind trace chemicals, molecules, and microbes on every object we touch. By sampling the molecules on cell phones, researchers at University of California San Diego School of Medicine and Skaggs School of Pharmacy and Pharmaceutical Sci...
So molecules like this ended up on Earth. In fact, what we call meteorites are pieces broken away from comets and asteroids that came in our atmosphere and left their extra-terrestrial organic matter on the surface of primitive Earth.这样的分子最终来到了地球上。事实上，我们所说的陨石是来自彗星...
Red is the colour with the longest wavelength; that means that as it travels through air molecules, it gets diffused(扩散)less than other colour, so it can be seen from a greater distance. Yellow has a shorter wavelength than red but a longer wavelength than green. This means that red is...
For example, nanoparticles with crystal facets transfer energy well when they crash into each other, making them an ideal component of materials designed to harvest energy. When it comes toenergy transport, these particles adhere to scientific norms that govern macroscopic linear systems—including chai...
distalpart of the dsDNA substrate dissociates from the complex. Therefore, thecatalytic cleft is open and able to sever ssDNA indiscriminately. This molecularmechanism would explain how ssDNA molecules are degraded by Cas12a after beingactivated by the presence of the RNA-DNA hybrid. In addition, ...
Unlike synthetic textiles, natural fabrics like linen are biodegradable, which means that their constituent molecules reabsorb into the surrounding environment within a matter of years instead of centuries. Natural fibers also don’t contribute to the ongoing microfiber pollution crisis in the ...
如果，地球独一无二 What if Earth were unique If we just take the time to observe it, nature provides us with a fascinating spectacle. Over time, the inhabitants of our planet have woven complex relationships of collaboration, symbiosis, dependence and predation.如果我们花时间去观察大自然，会发现...
This strange amount is called Avogadro's number (or Avogadro's constant) after Italian chemist Amedeo Avogadro (1776–1856), who thought up the idea. Avogadro's original hypothesis was that a certain volume of any gas will contain the same number of molecules as the same volume of any ...
Perms work by affecting the keratin in your hair. Keratin is a protein that makes up about 95% of your hair and forms the structure of your individual hairs. The bonds between keratin molecules are what react to the perm treatment and allow your hair to hold a new shape. ...
Longer chain molecules, such as proteins, take longer to be broken down by the body and as a result, don’t cause the blood sugar to spike in the way that single molecules like dextrose do. Like all simple sugars, dextrose has a sweet taste which our brains consider ‘rewarding’. This...