One side is attracted to negatively charged molecules on the surface of bacterial membranes.
Grotzinger compares these minerals to batteries: positively and negatively charged compounds that together can spark the beginnings of life.
The electron soon attaches itself to another molecule, making a negatively charged ion.
The material also contains negatively charged ions, which can be moved with electric pulses to different parts of the surface.
In this case, the voltage arises because the crystal deforms and a symmetry between positively and negatively charged atoms is disturbed.
As the water passes through the media, the negatively charged arsenic ions are absorbed onto the surfaces of the positively charged media particles.
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In an ultracapacitor, positively charged ions gather on the surface of the negatively charged electrode and negative ions on the surface of the positive electrode.
The others are large, negatively charged molecules that attach themselves to viral particles (which are positively charged on the outside) and thus render them harmless.
The electrolyte is designed to be charged in such a way that it can help the viruses--shod in their metal-oxide coats and negatively charged--line up just so.
The group at CERN, called the ALPHA collaboration, was looking at antihydrogen atoms in which a positively charged antielectron, also known as a positron, orbits a negatively charged antiproton.
If you zap purified water with electric current, you can split apart a water molecule into a positively charged hydrogen ion and a negatively charged hydroxide ion (oxygen attached to hydrogen).
Electrons, which are negatively charged, build up at the cathode.
They immersed films made of cellulose acetate butyrate in solutions of phenyl azido and silica (which is positively charged) and phenyl azido and poly-allylamine hydrochloride (which is negatively charged).
Safe enough to go into the human body, the hydrogel prevents biofilms from growing and, thanks to its positive charge, attracts negatively charged microorganisms, which it then pops like water balloons.
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Carrageenan contains large negatively charged molecules called sulphated polysaccharides.
One effect of the beam is to polarise the cloud of electrons surrounding each rubidium nucleus, meaning that part of the atom becomes a negatively charged pole, and part a positively charged pole.
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