chemical

These are chemical reactions that cause ozone destruction.

PPy can be synthesized by chemical or electrochemical method and doped with different ion to obtain better conductive property.

That's the old chemical plant, down by the waterfront.

Uh, the thing is, what’s especially interesting about meteorites is that they come from interplanetary space, but they consist of the same chemical elements that are in matter originating on earth, just in different proportions.

You see, it turns out that certain microorganisms are chemosynthetic – they don’t need sunlight because they take their energy from chemical reactions.

So, as I said, unlike green plants which are photosynthetic and get their energy from sunlight, these bacteria that they found at the ocean floor, these are chemosynthetic, which means that they get their energy from chemical reactions.

And this chemical reaction is what produces organic material, which is the food for larger organisms.

Student: Uh, it’s a protein, a specific kind of protein, one that speeds up chemical reactions.

So it’s possible that other not so typical trace metals may be used in chemical processes, that marine organisms might make enzymes from other trace metals when the essential one is scarce．

Basically, bioluminescence is light that’s produced by a chemical reaction.

Like I said, about half of all jellyfish are bioluminescent, so you may want to look at a particular type of jellyfish or several types that benefit from bioluminescence in the same way, or you could investigate current research on bioluminescence, on, on

Photoreceptors are cells that respond to light by sending out a chemical signal.

The whole food chain is affected by the overuse of chemicals in agriculture.

But when we analyze the cells chemically, we find something very interesting, a chemical in them, and an enzyme called telomerase.

As bits of the telomere break off from the end of Chromosome, this chemical, this telomerase can rebuild it, can help reassemble the protective DNA, the telomere that the Chromosome is lost.

And in the future, we may have virtually immortal nerve cells and immortal skin cells of whatever because these chemical, telomerase can keep the telomere on the ends of Chromosomes from getting any shorter.

and about how all this requires photosynthesis, when green plants or microbes converts sunlight into energy, and also requires microorganisms, bacteria, to secrete chemicals that break down or recycle the organic material to complete the cycle.

As we said, these hydrothermal vents are releasing into the ocean depth, this intensely hot water, and here’s the thing, this hot water contains chemical called hydrogen sulfide and also a gas, carbon dioxide.

Male Student: Wow! So just add a chemical to a gas and bingo!

I like the fact that organic farms don’t use chemical pesticides or anything that can pollute the soil or the water.

For example, some venoms are chemical-based, and others are bacteria-based, so they clearly had to have developed along different routes and may not be as closely related as we thought.