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  2. Median lethal dose - Wikipedia

    en.wikipedia.org/wiki/Median_lethal_dose

    In toxicology, the median lethal dose, LD 50 (abbreviation for "lethal dose, 50%"), LC 50 (lethal concentration, 50%) or LCt 50 is a toxic unit that measures the lethal dose of a given substance. [1] The value of LD 50 for a substance is the dose required to kill half the members of a tested population after a specified test duration.

  3. 50+1 rule - Wikipedia

    en.wikipedia.org/wiki/50+1_rule

    50+1 rule is an informal term used to refer to a clause in the regulations of the Deutsche Fußball-Liga (German Football League). The clause states that, in order to obtain a license to compete in the Bundesliga and 2. Bundesliga, a club must either wholly- or majority-own its association football team. In case of majority ownership, the ...

  4. P50 (pressure) - Wikipedia

    en.wikipedia.org/wiki/P50_(pressure)

    In biochemistry, p 50 represents the partial pressure of a gas required to achieve 50% saturation of a particular protein's binding sites. [ 1 ] [ 2 ] Values of p 50 are negatively correlated with substrate affinity; lower values correspond to higher affinity and vice versa .

  5. Fifty Shades of Grey - Wikipedia

    en.wikipedia.org/wiki/Fifty_Shades_of_Grey

    Fifty Shades of Grey is a 2011 erotic romance novel by British author E. L. James. [1] It became the first installment in the Fifty Shades novel series that follows the deepening relationship between a college graduate, Anastasia Steele, and a young business magnate, Christian Grey.

  6. Buy one, get one free - Wikipedia

    en.wikipedia.org/wiki/Buy_one,_get_one_free

    The economist Alex Tabarrok has argued, that the success of this promotion lies in the fact that consumers value the first unit significantly more than the second one. So compared to a seemingly equivalent "Half price off" promotion, they may only buy one item at half price, because the value they attach to the second unit is lower than even the discounted price.

  7. IC50 - Wikipedia

    en.wikipedia.org/wiki/IC50

    IC 50 values are typically expressed as molar concentration. IC 50 is commonly used as a measure of antagonist drug potency in pharmacological research. IC 50 is comparable to other measures of potency, such as EC 50 for excitatory drugs. EC 50 represents the dose or plasma concentration required for obtaining 50% of a maximum effect in vivo. [1]

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