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Schematic structure of DEAE-C: positively charged diethylaminoethanol groups can bind negative ions. Diethylaminoethyl cellulose (DEAE-C) is a positively charged resin used in ion-exchange chromatography, a type of column chromatography, for the separation and purification of proteins and nucleic acids.
In organometallic chemistry, sigma-bond metathesis is a chemical reaction wherein a metal-ligand sigma bond undergoes metathesis (exchange of parts) with the sigma bond in some reagent. The reaction is illustrated by the exchange of lutetium(III) methyl complex with a hydrocarbon (R-H): [1] (C 5 Me 5) 2 Lu-CH 3 + R-H → (C 5 Me 5) 2 Lu-R + CH 4
Sigma is the Sigma-Aldrich's main biochemical supplier, with offerings including antibiotics, buffers, carbohydrates, enzymes, forensic tools, hematology and histology, nucleotides, proteins, peptides, amino acids and their derivatives. The Sigma RBI Logo. Sigma RBI produces specialized products for use in the field of cell signaling and ...
The sigma baryons are a family of subatomic hadron particles which have two quarks from the ... which differ only in the wavefunction's behaviour upon flavour exchange.
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. It produces and distributes refrigerated foods, mainly lunch meats , cheeses , and yogurts .
Sigma Investments is the sole agent of Australia-based INGOT Brokers in the Middle East; Ingot Brokers, a portal which enables trading on global currencies and precious metals, and also facilitates clients on reaching foreign exchange markets. [1] It is a member of Global Alliance Partners (GAP). [1]
According to the sigma bond rule, the number of sigma bonds in a molecule is equivalent to the number of atoms plus the number of rings minus one. N σ = N atoms + N rings − 1 This rule is a special-case application of the Euler characteristic of the graph which represents the molecule.
In 1987 Millipore Corporation moved from the NASDAQ exchange to the New York Stock Exchange, where it traded under the ticker symbol MIL. [7] Millipore Corporation was on the S&P 500 list of the largest publicly traded companies in the United States [ 7 ] until it was acquired by Merck kGaA in 2010.