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  2. Polychlorinated biphenyl - Wikipedia

    en.wikipedia.org/wiki/Polychlorinated_biphenyl

    Because of their longevity, PCBs are still widely in use, even though their manufacture has declined drastically since the 1960s, when a host of problems were identified. [3] With the discovery of PCBs' environmental toxicity , and classification as persistent organic pollutants , their production was banned for most uses by United States ...

  3. Printed circuit board - Wikipedia

    en.wikipedia.org/wiki/Printed_circuit_board

    However, multilayer PCBs make repair, analysis, and field modification of circuits much more difficult and usually impractical. The world market for bare PCBs exceeded US$60.2 billion in 2014, [3] and was estimated at $80.33 billion in 2024, forecast to be $96.57 billion for 2029, growing at 4.87% per annum. [4]

  4. Point-to-point construction - Wikipedia

    en.wikipedia.org/wiki/Point-to-point_construction

    A few large brand names still use terminal strip-type point-to-point boards, but usually for special product lines. Electric guitar amplifier manufacturer Marshall have reissued some of their older models, using this type of construction as a design feature, although their standard products have long used PCBs. Thermionic valve equipment ...

  5. Poe Hall timeline: When did NC State know about PCBs ... - AOL

    www.aol.com/poe-hall-timeline-did-nc-100000740.html

    Nov. 13, 2023: An additional lab, SGS Galson, received samples of the air in Poe Hall. The company reported the results to NC State on Nov. 14. The results did not appear to indicate ...

  6. Bioremediation of polychlorinated biphenyls - Wikipedia

    en.wikipedia.org/wiki/Bioremediation_of...

    Bioremediation of PCBs is the use of microorganisms to degrade PCBs from contaminated sites, relying on multiple microorganisms' co-metabolism. Anaerobic microorganisms dechlorinate PCBs first, and other microorganisms that are capable of doing BH pathway can break down the dechlorinated PCBs to usable intermediates like acyl-CoA or carbon ...

  7. Putin lauds the strength of Russia’s war economy ... - AOL

    www.aol.com/news/putin-lauds-strength-russia-war...

    To the Russian public: “We’re still standing.” To Ukraine’s allies: “We can outlast you.” Projecting an image of Russia’s economic strength has real-world consequences.

  8. Polybrominated biphenyl - Wikipedia

    en.wikipedia.org/wiki/Polybrominated_biphenyl

    Exposure to the coplanar stereoisomer 3,3',4,4',5,5'-hexabromobiphenyl (but not the non-coplanar stereoisomer) in genetically susceptible mice is known to cause immunotoxicity and disorders related to the central nervous system, and even at doses as low as 2.5 mg/kg, excess neonatal fatalities are observed (LD 50 is from 5–10 mg/kg). [1]

  9. Printed circuit board manufacturing - Wikipedia

    en.wikipedia.org/wiki/Printed_circuit_board...

    PCBs may be plated with solder, tin, or gold over nickel. [18] [19] After PCBs are etched and then rinsed with water, the solder mask is applied, and then any exposed copper is coated with solder, nickel/gold, or some other anti-corrosion coating. [20] It is important to use solder compatible with both the PCB and the parts used.