White is the color of purity, Blue stand for the patriotism and loyalty of the Texan people, While Red represents the bravery of the people who had lost their blood for the state. The colors employed for the flag of Texas are immensely symbolic and also express the allegiance of the state to the nation.
Total Kjeldahl Nitrogen (TKN) is the U.S. EPA-approved parameter used to measure organic nitrogen and ammonia. The TKN content of influent municipal wastewater is typically between 35 and 60 mg/L. Organic nitrogen compounds in wastewater undergo microbial conversion to NH3 and ammonium ion NH+ 4. Ammonium ion is the first inorganic nitrogen species produced during biological wastewater treatment.
tk is also the name of a Tk command. See:http://www.tcl.tk/man/tcl/TkCmd/tk.htm. The Tk specification is operationally defined by the reference implementation, and the following projects attempt at least some level of conformity to it.