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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. Sigma bonding is most simply defined for diatomic molecules using the language and tools of symmetry groups. In this formal approach, a σ-bond is ...
Sigma AB (or Sigma Group) is a group of companies carrying out consultancy operations within IT, information logistics, engineering services, technical R&D, industry and social structure. Sigma AB offers its services through the business areas Sigma Technology, Sigma Connectivity, Sigma Industry, Sigma Civil and Sigma Software, within which ...
The different domains of Hell are represented by the legs and feet, with the Earthly and harmonious Heavenly realms represented by the upper stomach and chest, arms, and head; the navel represents the Unmanifest realm that is connected with pure sound and vibration, and absolute silence, which connects everything together.
RAID is composed of a central unit based in Bièvres (near Paris) and 13 regional branches named Antennes du RAID. The 13 Regional branches are located in metropolitan and overseas France and were formerly known as GIPNs. Brigade anticommando (BRI-BAC). The Paris Police Prefecture (PP) anti-terrorism task force. It is activated in emergency ...
Sigma Advanced Genetic Engineering (SAGE) Labs is a division within Sigma-Aldrich that specializes in genetic manipulation of in vivo systems for special research and development applications. It was formed in 2008 to investigate zinc finger nuclease technology and its application for disease research models.
Four cycloalkanes, all of which exhibit simple rings. In chemistry, a ring is an ambiguous term referring either to a simple cycle of atoms and bonds in a molecule or to a connected set of atoms and bonds in which every atom and bond is a member of a cycle (also called a ring system).
A hyperbola has two pieces, called connected components or branches, that are mirror images of each other and resemble two infinite bows. The hyperbola is one of the three kinds of conic section, formed by the intersection of a plane and a double cone. (The other conic sections are the parabola and the ellipse.
Sigma Pi Phi (ΣΠΦ), also known as The Boulé, is an African American professional fraternity. Founded in Philadelphia , Pennsylvania , in 1904, it is arguably the oldest fraternity for African Americans , between it and Alpha Phi Alpha founded at Cornell University.