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2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is a polychlorinated dibenzo-p-dioxin (sometimes shortened, though inaccurately, to simply 'dioxin') [3] with the chemical formula C 12 H 4 Cl 4 O 2. Pure TCDD is a colorless solid with no distinguishable odor at room temperature.
2,3,7,8-Tetrachlorodibenzofuran (TCDF) is a polychlorinated dibenzofuran with a chemical formula of C 12 H 4 Cl 4 O. TCDF is part of the chlorinated benzofuran (CDF) family that contains between 1 and 8 chlorine atoms attached to the parent dibenzofuran ring system. The CDF family includes 135 compounds, of which only a few have been studied.
By far most toxicity studies have been performed using 2,3,7,8-tetrachlorodibenzo-p-dioxin. The LD 50 of TCDD varies wildly between species and even strains of the same species, with the most notable disparity being between the seemingly similar species of hamster and guinea pig.
2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is the reference chemical to which the toxicity of other dioxins and DLCs are compared. TCDD is the most toxic DLC known. TCDD is the most toxic DLC known. Other dioxins and DLCs are assigned a scaling factor, or TEF, in comparison to TCDD.
360-degree feedback (also known as multi-rater feedback, multi-source feedback, or multi-source assessment) is a process through which feedback from an employee's colleagues and associates is gathered, in addition to a self-evaluation by the employee.
This estimation was based on the analysis of fat tissue biopsies collected with an interval of 28 months from on 14-year-old girl who for a period of about 2–3 years had been exposed to technical pentachlorophenol. The half-lives of Hexachlorodibenzo-p-dioxin and octachlorodibenzo-p-dioxin were estimated to be 3.5 and 2 years, respectively. [6]
A performance appraisal, also referred to as a performance review, performance evaluation, [1] (career) development discussion, [2] or employee appraisal, sometimes shortened to "PA", [a] is a periodic and systematic process whereby the job performance of an employee is documented and evaluated. This is done after employees are trained about ...
Additionally, the manufacturing process for 2,4,5-T contaminates this chemical with trace amounts of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). [4] TCDD is a carcinogenic persistent organic pollutant with long-term effects on the environment. With proper temperature control during production of 2,4,5-T, TCDD levels can be held to about .005 ppm.