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  2. Bioconcentration - Wikipedia

    en.wikipedia.org/wiki/Bioconcentration

    Bioconcentration. In aquatic toxicology, bioconcentration is the accumulation of a water-borne chemical substance in an organism exposed to the water. [1][2] There are several ways in which to measure and assess bioaccumulation and bioconcentration. These include: octanol-water partition coefficients (K OW), bioconcentration factors (BCF ...

  3. Bromochlorodifluoromethane - Wikipedia

    en.wikipedia.org/wiki/Bromochlorodifluoromethane

    Bromochlorodifluoromethane (BCF), also referred to by the code numbers Halon 1211 and Freon 12B1, is a haloalkane with the chemical formula C F 2 Cl Br. It is used for fire suppression, especially for expensive equipment or items that could be damaged by the residue from other types of extinguishers. [ 1 ]

  4. Tris(pentafluorophenyl)borane - Wikipedia

    en.wikipedia.org/wiki/Tris(pentafluorophenyl)borane

    Tris (pentafluorophenyl)borane, sometimes referred to as "BCF", is the chemical compound (C6F5)3B. It is a white, volatile solid. The molecule consists of three pentafluorophenyl groups attached in a "paddle-wheel" manner to a central boron atom; the BC3 core is planar. It has been described as the “ideal Lewis acid ” because of its high ...

  5. US government report says fluoride at twice the recommended ...

    www.aol.com/lifestyle/u-government-report-says...

    The report said that about 0.6% of the U.S. population — about 1.9 million people — are on water systems with naturally occurring fluoride levels of 1.5 milligrams or higher.

  6. r/K selection theory - Wikipedia

    en.wikipedia.org/wiki/R/K_selection_theory

    In ecology, r / K selection theory relates to the selection of combinations of traits in an organism that trade off between quantity and quality of offspring. The focus on either an increased quantity of offspring at the expense of reduced individual parental investment of r -strategists, or on a reduced quantity of offspring with a ...

  7. 3D printers turn regular guns into machine guns. Feds are ...

    www.aol.com/3d-printers-turn-regular-guns...

    Personally made firearms that fire one shot at a time are legal, as is 3D printing certain guns as a hobbyist. But further manufacturing faces a key legal test in October when the Supreme Court ...

  8. On this day in history, September 3, 1777, 'Stars and Stripes ...

    www.aol.com/news/day-history-september-3-1777...

    Our nation’s American flag was flown in battle for the first time, during a Revolutionary War skirmish at Cooch’s Bridge, Delaware on this day in history, Sept. 3, 1777, according to History.com.

  9. Endodontic files and reamers - Wikipedia

    en.wikipedia.org/wiki/Endodontic_files_and_reamers

    Miscellaneous endodontic instruments. From left: Lentulo spiral, reamer, K-file and H-file. Hand files can provide tactile sensation when cleaning or shaping root canals. This allows the dentist to feel changes in resistance or angulation, which can help determine curvature, calcification and/or changes in anatomy, in which two dimensional radiographs may not always identif

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