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pBR322 is a plasmid and was one of the first widely used E. coli cloning vectors. Created in 1977 in the laboratory of Herbert Boyer at the University of California, San Francisco, it was named after Francisco Bolivar Zapata, the postdoctoral researcher and Raymond L. Rodriguez. The p stands for "plasmid," and BR for "Bolivar" and "Rodriguez."
PBr 3 is prepared by treating red phosphorus with bromine. An excess of phosphorus is used in order to prevent formation of PBr 5: P 4 + 6 Br 2 → 4 PBr 3. Because the reaction is highly exothermic, it is often conducted in the presence of a diluent such as PBr 3. Phosphorus tribromide is also generated in situ from red phosphorus and bromine.
Plant breeders' rights (PBR), also known as plant variety rights (PVR), are rights granted in certain places to the breeder of a new variety of plant that give the breeder exclusive control over the propagating material (including seed, cuttings, divisions, tissue culture) and harvested material (cut flowers, fruit, foliage) of a new variety for a number of years.
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History. Porbandar railway station was owned by Porbandar State Railway during the Princely rule. Porbandar–JamJodhpur metre-gauge railway line was opened in 1888 [2] by working with Bhavnagar–Gondal–Junagad–Porbandar Railway. Later it was merged into Saurashtra Railway in 1948. [3] Further it is under taken by Western Railway on 5 ...
PBr 7 can be prepared by the sublimation of a mixture of phosphorus pentabromide and bromine. PBr 5 + Br 2 → PBr 7. The structure of PBr 7 consists of a tetrabromophosphonium cation [PBr 4] +, paired with a tribromide anion [Br 3] −, and the tribromide anion is non-symmetric. See also. Phosphorus tribromide; Phosphorus pentabromide; References