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Dibenzodioxin is the carbon skeleton of the poisonous polychlorinated dibenzodioxins (PCDDs), often called dioxins. The most harmful PCDD is 2,3,7,8-tetrachlorodibenzodioxin (TCDD). Dioxins and dioxin-like compounds is a category of pollutants that includes PCDDs and other compounds that have similar structure, toxicity, and persistence.
Polychlorinated dibenzodioxins (PCDDs), or simply dioxins, are a group of long-lived polyhalogenated organic compounds that are primarily anthropogenic, and contribute toxic, persistent organic pollution in the environment.
Polychlorinated dibenzofurans with chlorines at least in positions 2,3,7 and 8 are much more toxic than the parent compound dibenzofurane, with properties and chemical structures similar to polychlorinated dibenzodioxins. These groups together are often inaccurately called dioxins.
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In non-resistant TB, rifampin binds the beta subunit of RNA polymerase and disrupts transcription elongation. Mutation in the rpoB gene changes the sequence of amino acids and eventual conformation, or arrangement, of the beta subunit. In this case, rifampin can no longer bind or prevent transcription, and the bacterium is resistant. [19] [20]
Map of ancient Asia shows location of the Âu Việt state of Nam Cương and other Viet’s kingdoms. According to folklore, prior to Chinese domination of northern and north-central Vietnam, the region was ruled by a series of kingdoms called Văn Lang with a hierarchical government, headed by Lạc Kings ( Hùng Kings ), who were served by ...
Bà Rịa–Vũng Tàu (abbreviated BRVT) is a province of Vietnam.It is located on the coast of the country's Southeast region. It also includes the Côn Đảo islands, located some distance off Vietnam's southeastern coast.
Duy Khánh was born in 1936 in An Cư Village, Triệu Phước Commune, Triệu Phong District, Quảng Trị, Viet Nam.He was the youngest son in a family of descendants of the Duke and Deputy Chief Minister, Nguyễn Văn Tường of the Nguyễn dynasty.