10 Interesting Sulfur Facts

10 Interesting Sulfur Facts Sulfur is element number 16 on the periodic table, with element symbol S and an atomic weight of 32.066. This common nonmetal occurs in food, many household products, and even your own body. Here are 10 interesting facts about sulfur. Sulfur is an essential element for life. Its found in amino acids (cysteine and methionine) and proteins. Sulfur compounds are why onions make you cry, why asparagus gives urine a weird odor, why garlic has a distinctive aroma, and why rotten eggs smell so horrible.Although many sulfur compounds have a strong smell, the pure element is actually odorless. Sulfur compounds also affect your sense of smell. For example, hydrogen sulfide (H2S, the culprit behind the rotten egg odor) actually deadens the sense of smell, so the odor is very strong at first and then vanishes. This is unfortunate, because hydrogen sulfide is a toxic and potentially deadly gas! Elemental sulfur is considered non-toxic.Mankind has known about sulfur since ancient times. The element, also known as brimstone, primarily comes from volcanoes. While most chemical elements only occur in compounds, sulfur is one of relatively few elements that occurs in pure form.At room temperature and pressure, sulfur is a yellow so lid. Its usually seen as a powder, but it forms crystals, too. One interesting feature of the crystals is that they spontaneously change shape according to temperature. All you need to do to observe the transition is melt sulfur, allow it to cool until it crystallizes, and observe the crystal shape over time. Were you surprised you could crystallize sulfur simply by cooling the melted powder? This is a common method of growing metal crystals. While sulfur is a nonmetal, like metals, it wont readily dissolve in water or other solvents (although it will dissolve in carbon disulfide). If you tried the crystal project, another surprise might have been the color of sulfur liquid when you heated the powder. Liquid sulfur can appear blood-red. Volcanoes that spew molten sulfur display another interesting feature of the element. It burns with a blue flame from the sulfur dioxide that is produced. Volcanoes with sulfur appear to run with blue lava.How you spell the name of element number 16 likely depends where and when you grew up. The International Union of Pure and Applied Chemistry (IUPAC) adopted the sulfur spelling in 1990, as did the Royal Society of Chemistry in 1992. Up to this point, the spelling was sulphur in Britain and in countries using the Roman languages. The original spelling was actually the Latin word sulfur, which was Hellenized to sulphur. Sulfur has many uses. Its a component of gunpowder and believed to have been used in the ancient flamethrower weapon called Greek Fire. Its a key component of sulfuric acid, which is used in labs and to make other chemicals. Its found in the antibiotic penicillin and is used for fumigation against diseases and pests. Sulfur is a component of fertilizers and also pharmaceuticals.Sulfur is created as part of the alpha process in massive stars. It is the 10th most abundant element in the universe. Its found in meteorites and on Earth mainly near volcanoes and hot springs. The abundance of the element is higher in the core than in the Earths crust. Its estimated there is enough sulfur on Earth to make two bodies the size of the Moon. Common minerals that contain sulfur include pyrite or fools gold (iron sulfide), cinnabar (mercury sulfide), galena (lead sulfide), and gypsum (calcium sulfate).Some organisms are able to use sulfur compounds as an energy source. An example are cave bacteria , which produce special stalactites called snottites that drip sulfuric acid. The acid is sufficiently concentrated that it can burn skin and eat holes through clothes if you stand beneath the minerals. Natural dissolution of minerals by the acid carves out new caves. Although people always knew about sulfur, it wasnt recognized as an element (except by alchemists, who also considered fire and earth elements). It was 1777 when Antoine Lavoisier provided convincing evidence the substance was indeed its own unique element, worthy of a place on the periodic table. The element has oxidation states ranging from -2 to 6, allowing it to form compounds with all of the other elements except the noble gases.

Designing an effective training program for a Business.

Designing an effective training program for a Business. In order for training to be effective, it must be coordinated with the company'soverall objectives. At the same time, it is important to design a training program that will allow employees to fulfill their personal goals. There are five steps that I would take to create an effective systems approach to training that recognizes both of these needs: make a needs assesment, develop instructional objectives, foster a learning environment, develop learning expectancies, and finally, develop a system to evaluate the training. These steps make up the systems approach to training, which has recently become popular due to its effectiveness.As a human resource director for a new company, I would first assess the needs of both the organization and the person. To assess the needs of the new organization, I would conduct interviews with each department managerand the president. In the interviews with the new managers, they would identify the skills that an employee needs to perform his/her duties , called a task analysis.OJT PosterThis analysis would aid me in determining the content of the training program and hopefully gain the managers' approval. Next, I would interview the president of the company. He or she would tell me the strategy and mission of the company. It is important that the training program is tied into the organizational strategy. For instance, it would be unnecessary to train an employee in advanced computer applications when the organizational strategy revolves around relationship selling. Person analysis is also an important step, as I would not want to train an employee who is not capable of, or who already knows, the task.Next, I would develop the instructional objectives, or desired outcomes, of the training program. This 'end to beginning' approach of setting the desired results before designing the program will provide a basis for...

Alzheimer Disease Essay Example | Topics and Well Written Essays - 1500 words

Alzheimer Disease - Essay Example Alzheimer's disease is the most common form of dementia that attacks the brain and accounts for 60 to 80 percent of cases. The more gradual form, with slow progress of symptoms, begins around ages 65 to 70 and affects approximately 1%-6% of the AD patients. See Table 1.1. About 60% of early-onset AD is familial, with 13% being inherited due to family history [Rocca et al 1991, Campion et al 1999]. A rapidly progressive form begins around ages 36 to 45. Both sexes are affected usually beginning in middle age and older adults, but women are more likely to develop Alzheimer's than men, as women live longer, on average, than men. According to the research from the Aging, Demographics and Memory Study (ADAMS), 14% of all people aged 71 and older have dementia. The estimate done in 2008, states that 2.4 million women and 1 million men aged 71 and older have dementia. As many as 5.3 million people in the United States are living with Alzheimer's. This figure includes 5.1 million people aged 65 and older and 200,000 individuals under age 65 who have younger-onset Alzheimer's. Based on these estimates, approximately 500,000 Americans under age 65 have Alzheimer's or other dementia. Of these, about more than 46% are estimated to have Alzheimer's disease. See Table 1.2 AD is a genetically complex and heterogeneous disorder. Particularly for genetic studies, Alzheimer's disease is often categorized according to age. ... Commonly knowm as the "Mild Cognitive impairment". (Petersen et al. 1999) Mild cognitive impairment is a major focus of research to facilitate early intervention while functional status is preserved. It can be further classified into Psychiatric Genetics or Molecular Genetics. Late on-set Familial AD: According to Smoller, Sheidley and tsuang, the research evidence proves the presence of additional AD genes. For example, the family history (Payami et al, 1997) or monozygotic twin status (Bergem et al, 1997) remains after APOE4 is controlled for. Also, a segregation analysis points to the existence if many additional late on-set AD genes (Daw et al, 2000) and the peak age at onset is in the 60's. Linkage analysis has provided several clues to where such AD genes may reside (reviewed in Bertram and tanzi 2004; Kamboh 2004). Other than the APOE region on chromosomes 9, 10 and 12. (Blacker et al 2003); Myers et al 2002). More than 200 genes have been tested for association with AD, with discouraging results (Alzheimer research Forum 2005; Kamboh 2004). There is a possibility of huge understanding in AD genetics. The discovery of the APP, PSEN1, and PSEN2 has contributed greatly to the AD, and at least 20 drugs are in the process of development in genetics research. These may help in early detection and intervention and further prevention. In addition, the study can help in providing genetic counseling and genetic testing for patients with family history. Early-onset familial AD (EOFAD): Early-onset cases can occur in families with generally late-onset disease (Brickell et al 2006). At least three subtypes of molecular genetics EOFAD (AD1, AD3, and AD4) have been identified based on the causative gene.