Graves' disease Graves' disease (or Basedow-Graves disease) is an autoimmune disease. It most commonly affects the thyroid, frequently causing it to enlarge to twice its size or more (goiter), become overactive, with related hyperthyroid symptoms such as increased heartbeat, muscle weakness, disturbed sleep, and irritability. It can also affect the eyes, causing bulging eyes (exophthalmos). It affects other systems of the body, including the skin, heart, circulation and nervous system. It affects up to 2% of the female population, sometimes appears after childbirth, and occurs 7 to 8 times more often in women than in men. Genetic factors are a major factor accounting for possibly around 80% of the risk. Smoking and exposure to second-hand smoke is associated with the eye manifestations but not the thyroid manifestations. Signs and symptoms Graves' disease symptoms Cause The Immunoglobulin G antibody recognizes and binds to the thyrotropin receptor (TSH receptor). Diagnosis
[IUPAC]IUPAC.org Where to find MSDS and SDS on the Internet General Sites These sites have large collections of MSDS and are a good place to start your search. [Top] [General Sites] [Governmental] [Chemical Companies] [Pesticides] [Misc] Government and Non-Profit Sites The first two sites return all sorts of chemical information; the remainder are written more for humans rather than corporate lawyers and are good sites for non-chemists to find information. Chemical Manufacturers and Suppliers The best place to start if you have a bottle from that particular manufacturer! Pesticides (herbicides, insecticides, fungicides, nematicides, rodenticides etc.) A great place to start for farmers, home gardeners or someone who got too close to a crop dusting plane. Miscellaneous Look here for manufacturers whose primary business is not chemicals.
Pathogenesis of Graves' disease Graves' disease is a syndrome that may consist of hyperthyroidism, goiter, eye disease (orbitopathy), and occasionally a dermopathy referred to as pretibial or localized myxedema. The terms Graves' disease and hyperthyroidism are not synonymous, because some patients may have orbitopathy but no hyperthyroidism, and there are many other causes of hyperthyroidism in addition to Graves' disease. Hyperthyroidism is the most common feature of Graves' disease, affecting nearly all patients, and is caused by autoantibodies to the thyroid stimulating hormone (TSH, thyrotropin) receptor (TSHR-Ab) that activate the receptor, thereby stimulating thyroid hormone synthesis and secretion as well as thyroid growth (causing a diffuse goiter). The presence of TSHR-Abs in serum and orbitopathy on clinical examination distinguishes the disorder from other causes of hyperthyroidism. Other causes of an overactive thyroid gland are discussed separately. (See "Disorders that cause hyperthyroidism".)
Stereoisomers Stereoisomers As defined in an earlier introductory section, isomers are different compounds that have the same molecular formula. When the group of atoms that make up the molecules of different isomers are bonded together in fundamentally different ways, we refer to such compounds as constitutional isomers. For example, in the case of the C4H8 hydrocarbons, most of the isomers are constitutional. Shorthand structures for four of these isomers are shown below with their IUPAC names. Note that the twelve atoms that make up these isomers are connected or bonded in very different ways. The bonding patterns of the atoms in these two isomers are essentially equivalent, the only difference being the relative orientation or configuration of the two methyl groups (and the two associated hydrogen atoms) about the double bond. Configurational Stereoisomers of Alkenes Some examples of this configurational stereoisomerism (sometimes called geometric isomerism) are shown below. Ethane Conformations
Category:Chemistry The main article for this category is Chemistry. Subcategories This category has the following 70 subcategories, out of 70 total. Pages in category "Chemistry" The following 98 pages are in this category, out of 98 total. Home WebElements Periodic Table of the Elements