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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Negative Regulator Molecules01:23

Negative Regulator Molecules

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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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Types of Selection01:46

Types of Selection

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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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Elimination Reactions02:25

Elimination Reactions

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A nucleophile can react with an alkyl halide to give the substitution product by displacing the halogen. Or it can function as a base to give the elimination product by deprotonation of the neighboring carbon to form an alkene. In an elimination reaction, the substrate loses two groups from adjacent carbons forming at least one π bond. The carbon attached to the halogen is called the α carbon, while the adjacent carbon is called the β carbon; hence, these reactions are called...
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Positive, Negative, and Zero Work00:58

Positive, Negative, and Zero Work

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Work is done on an object when energy is transferred to the object. In other words, work is done when a force acts on a body that undergoes a displacement from one position to another. By definition, the work done by a force is the integral of the force with respect to the displacement along its path. Forces can vary as a function of position, and displacements can occur along various paths between two points. The magnitude of a force multiplied by the cosine of the angle that the force makes...
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Enhanced Elimination of Poison01:26

Enhanced Elimination of Poison

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Poison can be effectively removed from the gastrointestinal (GI) tract through various decontamination procedures.
Antidotes serve a crucial role in counteracting the effects of poison by inhibiting enzymes responsible for producing harmful drug metabolites. In some cases, these toxic metabolites can be neutralized by endogenous cosubstrates, which are maintained at specific concentrations to prevent interaction with cellular macromolecules and subsequent cell death.
Renal excretion is the...
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Examination of Thymic Positive and Negative Selection by Flow Cytometry
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The "Negative" List.

Loyd V Allen

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    Summary
    This summary is machine-generated.

    This article lists drugs unsafe or ineffective for compounding, as identified by the Pharmacy Compounding Advisory Committee. It also details product combinations that cannot be compounded due to safety concerns.

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    Area of Science:

    • Pharmaceutical Sciences
    • Regulatory Affairs

    Background:

    • H.R. 3204 mandated the Pharmacy Compounding Advisory Committee (PCAC).
    • The PCAC addresses critical issues in pharmaceutical compounding, including "Negative Lists," "Positive Lists of Active Pharmaceutical Ingredients," and "Demonstrable Difficulties in Compounding."

    Purpose of the Study:

    • To identify and list drug products withdrawn from the market due to safety or efficacy concerns.
    • To provide guidance on compounded drug combinations that are not permissible.

    Main Methods:

    • Review of drug products removed from the market.
    • Analysis of safety and efficacy data for compounded medications.
    • Identification of specific ingredient/product combinations unsuitable for compounding.

    Main Results:

    • A current list of drugs deemed unsafe or ineffective for compounding is presented.
    • Specific "kits" or combinations of ingredients/products that cannot be compounded are identified.

    Conclusions:

    • The article provides essential information for pharmacists regarding compounding restrictions.
    • Adherence to these guidelines ensures patient safety and regulatory compliance in pharmaceutical compounding.