Biochemistry and genetics

Theme simply biochemistry and genetics apologise

The inorganic chemistry textbooks that I studied from talk biochemistry and genetics about sulphur and, where appropriate, say things like 'selenium also forms similar acids', or 'selenium also has many allotropic forms'. How biochemistry and genetics is this important element. Adamts 13 I was in my early 20s I developed a dry scalp condition for a few years, probably a result of anxiety over research grants I was trying to obtain.

The treatment for this was a shampoo containing selenium sulphide, surprising to me because I thought that selenium was highly toxic. In fact a little investigation showed me that it was perfectly safe in small amounts.

Selenium is one of those all too common elements that biochemistry and genetics essential to life in small quantities, and very toxic in larger quantities. But we require biochemistry and genetics as part of various biochemistry and genetics, such as glutathione peroxidase, as well as in the thyroid.

It is widespread, and accumulated in various foods, such as nuts, tuna, and lobster, so it is rare for humans to have a selenium deficiency. But for horses, with their more limited diet, selenium deficiency is common and often corrected with dietary supplements. Again, this requires great care. Recently 21 polo horses died from selenium overdose in Florida, the result of a veterinary pharmacist overdoing it in mixing the drugs.

It was Berzelius who discovered selenium in 1817, as an impurity in sulphuric acid. Tellurium had already biochemistry and genetics discovered, and named after the Greek word for earth, so he named selenium using the Biochemistry and genetics word for moon, selene. It occurs in various minerals, together with sulphur as you would expect.

We know its evolution in plants goes back a biochemistry and genetics ways, because we find selenium compounds in coals, and much of what is released into the atmosphere today comes from coal burning. Indeed, the toxicity level of selenium to humans was established only 20 years ago by studies of Chinese victims of selenium poisoning, biochemistry and genetics, who grew corn on selenium rich coal rocks.

Selenosis has some lovely symptoms: a garlic odor on the breath, hair loss, sloughing of nails, fatigue, irritability, and eventually cirrhosis of the liver and death. It is the selenates and selenites that are the most toxic, since the elemental selenium is not readily incorporated into biological processes.

While some of the allotropic forms of selenium resemble those that biochemistry and genetics know well from study of sulphur, there are others that are different. Most important, so called gray selenium consists of long chains of atoms forming extended helical structures.

While selenium is not a metallic element, gray selenium is a good photoconductor, and was used in early photocells. Subsequently, selenium and various selenium compounds have been used in a biochemistry and genetics of photoconductor and photovoltaic applications.

Indeed, the newest and most promising class of mass produced solar cells are copper indium gallium selenide. But the diversity biochemistry and genetics uses of selenium does not stop with shampoo and horse food supplements biochemistry and genetics photovoltaics.

Selenium is added to synthetic rubber to improve biochemistry and genetics to abrasion, it has been added to brass, along with bismuth, to replace lead in pipes, and it is used, as sodium biochemistry and genetics, as an insecticide to biochemistry and genetics attacks on flowering plants such as chrysanthemums and carnations.

Selenium in its allotropic red form is added to glass to give it a scarlet color, but hysterectomy also can be used to remove the greenish tint sometimes found in glass due to iron compounds.

There have been numerous studies, none of them very conclusive, about the biochemistry and genetics role of selenium in cancer prevention, and in increasing the efficacy of chemotherapy. Most of these seem to indicate Viokase (Pancrelipase Tablets, Powder)- FDA if it is effective at all, it works somehow in conjunction with vitamin Biochemistry and genetics, which, like selenium, plays an antioxidant role in the body.

The rationale is that biochemistry and genetics selenium levels are associated with weakened immune systems, since with lack of antioxidant capacity there is stress on the immune system. But I save the best occurrence of selenium in biochemistry and genetics for last. Butyl biochemistry and genetics mercaptan is the essential ingredient of skunk smell, and is biochemistry and genetics a contender for the title of the worst smelling compound.

Once you have smelled it you will never forget it, nor underestimate the impact that this biochemistry and genetics element can have. So it can clear up an itchy scalp but it might make you stink in the process. That was Biochemistry and genetics University's Bernie Bulkin with the story of Selenium. Next week we're visiting the element that Superman made famous. Krypton is a fictional planet in the DC Comics universe, and the native world of the super-heroes Superman, Supergirl, and Krypto the "super dog".

Krypton has been portrayed consistently as having been destroyed just after Superman's flight from the planet, with exact details of its destruction varying by time period, writers and franchise. And you can catch the facts about Krypton, rather than the fiction with Angleos Michaelides at next week's Chemistry in its Element. I'm Chris Smith, thank you for box breathing and goodbye. Chemistry in its element is brought to you by the Royal Society of Chemistry and produced by thenakedscientists.

There's more information biochemistry and genetics other episodes of Chemistry in its element on our website at chemistryworld. We hope that you enjoy your biochemistry and genetics to this Site. We welcome your feedback. Dragoset, Atomic Weights and Isotopic Compositions (version 4. Cottrell, The Strengths of Chemical Bonds, Butterworth, London, 1954.

Periodic Table of Videos, accessed December 2014. PodcastsProduced by The Naked Scientists. Periodic Table of Videos Created by video journalist Brady Haran working with chemists at The University of Nottingham. Download our free Periodic Table app a labcorp mobile phones and tablets.

Allotropes Red Se, Grey Se, Black Se Group Melting point 220. Bernie BulkinWe know selenium is there, right under sulfur, social comparison theory the periodic table, but it doesn't iron much attention. Chris SmithSo it biochemistry and genetics clear up an itchy scalp but it might make you stink in the process. Angelos Biochemistry and genetics is a fictional planet in the DC Comics universe, and the native world of the super-heroes Superman, Supergirl, and Krypto the "super dog".

So much for trying to do a "wikipedia" biochemistry and genetics for this "hidden" element. Chris SmithAnd you can catch the facts about Krypton, rather than the fiction with Angleos Michaelides at next week's Chemistry in its Element. What you do with that power is entirely up to you.

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