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Sigma Chemical Company of St. Louis and Aldrich Chemical Company of Milwaukee were both American specialty chemical companies when they merged in August 1975. The company grew throughout the 1980s and 1990s, with significant expansion in facilities, acquisitions and diversification into new market sectors.
σ bond between two atoms: localization of electron density. In chemistry, sigma bonds (σ bonds) or sigma overlap are the strongest type of covalent chemical bond. [1] They are formed by head-on overlapping between atomic orbitals along the internuclear axis.
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Kappa Sigma (ΚΣ), commonly known as Kappa Sig or KSig, is an American collegiate social fraternity founded at the University of Virginia in 1869. Kappa Sigma is one of the five largest international fraternities with currently 318 active chapters and colonies in North America. [2]
Sigma Healthcare Limited is an Australian, ASX-listed company with a focus on the pharmacy industry. [1] The company has pharmacy operations in retail, wholesale and distribution.
Sigma Sigma Sigma (ΣΣΣ), also known as Tri Sigma, is a national American women's sorority.. Sigma Sigma Sigma is a member of the National Panhellenic Conference (NPC), an umbrella organization encompassing 26 national sororities or women's fraternities, which focus on service, education, scholarship programming and social activities.
Sigma has made a number of film SLR cameras, including the SA-300, SA-5, SA-7 and SA-9.. Up until the Sigma FP, [7] all Sigma SLR, DSLR, and mirrorless cameras used the Sigma SA mount, which is mechanically similar to the Pentax K mount and electrically an adaptation of the Canon EF lens mount lens control system.
Sigma Alimentos, S.A. de C.V., also known as Sigma or Sigma Alimentos, is a Mexican multinational food processing and distribution company headquartered in San Pedro, near Monterrey, Mexico.