- Intro to biogeochemical cycles
- Biogeochemical cycles overview
- The water cycle
- The water cycle
- The carbon cycle
- The carbon cycle
- The nitrogen cycle
- The nitrogen cycle
- The phosphorus cycle
- Phosphorus cycle
- Eutrophication and dead zones
- Biogeochemical cycles
Introduction to the phosphorus cycle. How phosphorus is recycled from phosphate to ATP and DNA.
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- If the grey atoms are carbon, the red atoms are oxygen, the blue atoms are nitrogen, and the orange atoms are phosphorus, then what are the white atoms?(2 votes)
- So by being a vegan you will have a higher amount of fosfate right? random question - can you get too much fosfate from eating too much plants? And is that why people say it is healthy to eat plants? So more new cells are produced...?(2 votes)
- Being vegan gives you a lower amount of phosphate. Animal proteins such as milk and cheese give you a higher amount of phosphate. And you can get to much phosphate from eating to much of anything, really. I wouldn't say it's healthy to eat just plants, but if you're diet constricts you of eating animal proteins then yes. Eating vegetables are good for you and help make you more healthy. And eating plants or vegetables has nothing to do with producing new cells.(2 votes)
- Can a Phosphate molecule, die? If it can what causes death?(1 vote)
- A Phosphate molecule cannot die. It is not living. It will eventually get recycled though.(2 votes)
- so what about if they burn the plants, will the phosphorous still return to the soil by means of the ashes?(0 votes)
- no, because after burning you produce different chemical compounds.(5 votes)
- How does phosphorus gather up in these rocks?(0 votes)
- Dont quote me on this but, I think it's just that phosphorus was part of the earth when it had no crust and was just boiling hot molton rock. When the earth cooled, phosphorus (being reactive) could make up part of the rock. Phosphorus could also be brought by meteorites and react the the crust of the earth. I'm making assumptions here, maybe someone can correct me!(4 votes)
- is phosphorus not gaseous like the other element in cycling?(1 vote)
- No, it does not have a gaseous state. Therefore it does not pass through atmosphere.(2 votes)
- I thought phosphate was used to make fertilizers AND Cow Food.(1 vote)
- If our mining is what upsets the natural P cycle, why do we actually need to mine it? What do we use this mined P for, the most?
Is it because extracting it from biomass/waste streams is not feasible?(1 vote)
- do humans use phosphorus for other things?besides putting it into plants to get(grow) more plants.(1 vote)
- Do you mean the uses of mined P?(1 vote)
- Do you have a video about the sulfur cycle?(0 votes)
- [Instructor] Let's talk a little bit about the element, phosphorous, and its importance to life and how it cycles through living systems. So we're gonna talk about the phosphorous cycle. First, it's important to appreciate that phosphorous is a very reactive element, so it's seldom found by itself. Normally, we find it in phosphate form. So this right over here, the orange is a phosphorous atom, and it's bound to four oxygens right over here, and at least the way that it's set up right over here, it would have a -3 charge. This would often form ionic bonds with other things, or one of the oxygens can have a covalent bond, or you can form phosphoric acid where the oxygen's bound to hydrogens, but this is the general form that you typically find it. That's the phosphorous that I'm pointing to, but this whole thing, we would call this a phosphate. We would call this a phosphate. You see this showing up in very important macromolecules in biology. This is DNA, and both DNA and RNA have phosphate backbones. You can see the sides of the ladder, I guess you could view it as that word, the backbone of our DNA molecules. You can see these phosphates there and in the center of the phosphate, you have the phosphorous atom. Also over here, you have ATP. In biology, we study that. It's the powerhouse. It's the energy currency of biological systems, stands for adenosine triphosphate. You have three phosphate groups right over here, and when you pluck one of those phosphate groups off, it can power reactions. It can change the confirmation of enzymes. It can do all sorts of interesting things, so hopefully you can appreciate that phosphate is essential for life, 'cause life as we know it involves ATP, and involves DNA, and many, many other things that phosphates are involved with. Phosphate, or phosphorous I should say in particular, is a little bit different than carbon or nitrogen in that it's not found in the atmosphere. It's not typically found as a gas. Instead, phosphate is going to be found in rocks, and it's going to be phosphate-based rocks. There will be other elements in there. It could be chlorine. There's a bunch of different types of phosphate rocks, but when they're in their sedimentary form, let me create some soil here. Let's say this soil has some phosphates in it. Then, it allows things like plants to grow in that soil. This is a plant growing in that soil, and the plant, we've talked about it before, it could be fixing carbon from the atmosphere using light energy, but its phosphate is going to come from the soil. That phosphate was already there, and that helps that plant grow because that plant needs that phosphate for its ATP, its DNA, its RNA, and for other things. Phosphate is often considered a rate limiting factor for the growth of things like plants, and that's why a lot of fertilizers will have phosphorous in them, or phosphates, or nitrogen's another one. Next time you think about fertilizer, you're fertilizing things in your garden, look at the ingredients. You will see phosphate there because that might be the scarce resource or the thing that is limiting the actual growth of the plant. Then you might say, "I have ATP and DNA in my body. "How do I get phosphates?" Well, you get it by eating plants. This is you eating a plant. The plant goes back there. How does this form a cycle? When any of this living matter dies, and I've said it in previous video, I'll show the dead plant 'cause a dead animal, it's just a little darker. So whenever you see the plant now, it's dead. Let's say it got buried somehow, some soil, so it's all just a dead plant right over there. The phosphates in that plant can then go back into the soil. You could view this as a very tight cycle and the same thing would be once you die or I die, the phosphates, if we're buried, would go into the soil, but there could be other ways that the phosphate and the corresponding phosphorous gets recycled. You could think on a bigger scale where you could have, let's say there's a river. There's a river right over here. This is either a very small river or a very big plant that I drew. That river can take phosphates from that soil, and it could put it into the ocean, and then those phosphates could be used by sea life. Then when that sea life dies, it goes to the base of the ocean floor, and at some point in the future, that base of the ocean floor could be pushed up, and a plant grows on it. So you can imagine all sorts of these cycles. We're actually seeing more and more of this as human beings have said, "If phosphate is the rate limiting factor for the growth "of plants, and we need to grow a lot of plants "in order to feed ourselves, we've started mining it." We've started adding a lot more to the soil, but it also allows a lot of that to be washed away into our rivers and streams, and eventually end up in the ocean. As we'll see, this can actually have very negative consequences for our biosphere.