A CAS Registry Number is a numeric identifier that can contain up to 10 digits, divided by hyphens into three parts. The right-most digit is a check digit used to verify the validity and uniqueness of the entire number. Numbers are assigned in sequential order to unique, new substances identified by CAS scientists for inclusion in the database. A CAS Registry Number, however, is unique and specific to only one substance regardless of how many other ways the substance can be described. Substances that come from sources other than literature or patent publications may not contain any references. CAS indexes these substances to support registration policies, chemical libraries, chemical catalogs, web sources, reaction databases and data collections not represented in STN. Note that there is a fee associated with these services. Other resources may have associated an incorrect CAS Registry Number with a compound, and use of that incorrect CAS Registry Number in searches could lead you to irrelevant or inappropriate information. Thanks for getting in touch.
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Learn More. Organic chemistry is the study of the structure, properties, composition, reactions, and preparation of carbon-containing compounds, which include not only hydrocarbons but also compounds with any number of other elements, including hydrogen most compounds contain at least one carbon—hydrogen bond , nitrogen, oxygen, halogens, phosphorus, silicon, and sulfur.
The Right Chemistry: ‘Dirty bombs’ and Prussian Blue
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I think Goldfinger is the best of the James Bond movies. Remember the scene when Bond is secured to a table made of pure gold and Goldfinger activates a laser that starts to melt the metal and threatens to bisect ? Bond, I expect you to die! That was in , before global terrorism introduced the possibility of using the combination of radioactive material and conventional explosives to inflict radioactive damage on a population. There are a number of radioactive isotopes that are produced in nuclear reactors that have practical application.
Cobalt is used in the radiotherapy of cancer, americium is used in smoke detectors and iridium is used in industrial radiography to locate flaws in metal components. Terrorists could conceivably get their hands on such radioactive isotopes. Much research has been dedicated to finding antidotes for radioactive materials that may be inhaled or ingested in case of a nuclear accident or terrorist attack.
The most publicized has been the swallowing of potassium iodide pills with the intent of saturating the thyroid gland with iodide and preventing the uptake of radioactive iodide that may be released in a Chernobyl-type accident. Prussian Blue has the ability to bind the radioactive metal ions that are released by dirty bombs and subsequently eliminate them from the body. It can also be used in cases of thallium poisoning.
This pigment has a fascinating history.
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