sulfur cycle

sulfur cycle

 circulation of sulfur in various forms through nature. Sulfur occurs in all living matter as a component of certain amino acids (amino acid). It is abundant in the soil in proteins (protein) and, through a series of microbial transformations, ends up as sulfates (sulfate) usable by plants.

      Sulfur-containing proteins are degraded into their constituent amino acids by the action of a variety of soil organisms. The sulfur of the amino acids is converted to hydrogen sulfide (H2S) by another series of soil microbes. In the presence of oxygen, H2S is converted to sulfur and then to sulfate by sulfur bacteria. Eventually the sulfate becomes H2S.

      Hydrogen sulfide rapidly oxidizes to gases that dissolve in water to form sulfurous and sulfuric acids (sulfuric acid). These compounds contribute in large part to the “acid rain” (acid rain) that can kill sensitive aquatic organisms and damage marble monuments and stone buildings.

* * *


Universalium. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • Sulfur cycle — Sulfur is one of the constituents of many proteins, vitamins and hormones. It recycles as in other biogeochemical cycles.The essential steps of the sulfur cycle are: * Mineralization of organic sulfur to the inorganic form, hydrogen sulfide:… …   Wikipedia

  • sulfur cycle — noun the natural cycle which includes the mineralization of organic sulfur to sulfide, oxidation of this to sulfate, and reduction of this to sulfide followed by microbial incorporation of this into organic compounds …   Wiktionary

  • Hybrid sulfur cycle — The hybrid sulfur cycle (HyS) is a sequence of processes used for hydrogen production. It is a variant of the sulfur iodine cycle.The HyS cycle involves a thermochemical and an electrochemical reaction, where the net reaction is the decomposition …   Wikipedia

  • Sulfur-iodine cycle — The sulfur iodine cycle (S I cycle) is a series of thermochemical processes used to produce hydrogen.The S I cycle consists of three chemical reactions whose net reactant is water and whose net products are hydrogen and oxygen. All other… …   Wikipedia

  • Sulfur — This article is about the chemical element. For other uses, see Sulfur (disambiguation). phosphorus ← sulfur → chlorine …   Wikipedia

  • sulfur bacterium — ▪ biology plural  Sulfur Bacteria,         any of a diverse group of microorganisms capable of metabolizing sulfur and its compounds and important in the sulfur cycle (q.v.) in nature. Some of the common sulfur substances that are used by these… …   Universalium

  • sulfur bacteria — several species of bacteria, esp. of the genera Beggiatoa and Thiobacillus, that have the ability to utilize sulfur or inorganic sulfur compounds as an energy source. [1900 05] * * * Any of a diverse group of bacteria that are capable of… …   Universalium

  • Cycle Soufre-iode — Le cycle iode soufre (cycle IS ou S I en anglais) est une série de processus thermochimiques utilisée pour la production d hydrogène. Il consiste en trois réactions chimiques dont le réactif net est l eau et dont les produits nets sont de l… …   Wikipédia en Français

  • Sulfur hexafluoride — Chembox new Name = Sulfur hexafluoride ImageFile = Sulfur hexafluoride 2D dimensions.png ImageSize = 100px ImageName = Structure and dimensions of the sulfur hexafluoride molecule ImageFile1 = Sulfur hexafluoride 3D balls.png ImageSize1 = 100px… …   Wikipedia

  • Sulfur assimilation — Sulfate reduction and assimilation in plants (APS, adenosine 5 phosphosulfate; Fdred, Fdox, reduced and oxidized ferredoxin; RSH, RSSR, reduced and oxidized glutathione)|right|325pxSulfur is an essential element for growth and physiological… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”