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Radical Reactivity: Concentration Effects01:20

Radical Reactivity: Concentration Effects

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In a radical reaction, the concentration of starting materials governs the selectivity of a radical. For example, the reaction between an alkyl halide and an alkene, in the presence of tin hydride and AIBN, begins with the generation of a tin radical. The generated radical then abstracts halogen from the alkyl halide, producing an alkyl radical. This alkyl radical can either react with tin hydride, yielding an alkane, or add to an alkene, generating a nitrile-stabilized radical, eventually...
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Blood transfusion is a critical medical procedure that saves lives and treats various medical conditions. It involves transferring blood from a donor to a recipient. This process requires a thorough understanding of the ABO blood group system and its associated antigens and antibodies.
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Blood transfusion is a therapeutic measure to restore the blood volume after extensive blood loss due to an accident or a medical procedure. Blood transfusion involves drawing a certain amount of blood from a suitable donor and infusing it into the recipient.
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A concentration cell is a type of a  voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
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Single Nucleotide Polymorphisms-SNPs01:05

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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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Routine Screening Method for Microparticles in Platelet Transfusions
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POLYMORPHISM OF COLLECTION, TRANSFUSION AND EFFECTIVENESS OF DONOR PLATELETS CONCENTRATES.

M N Gubanova, R F Ayupova, E B Zhiburt

    Anesteziologiia I Reanimatologiia
    |June 23, 2018
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    Summary
    This summary is machine-generated.

    Platelet transfusions are frequently used preventatively, especially in oncology patients, but target levels may exceed evidence-based guidelines. Apheresis platelets are commonly used, with single-donor units preferred over pooled ones.

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    Area of Science:

    • Hematology
    • Transfusion Medicine

    Background:

    • Platelet transfusions are critical for managing bleeding risks, particularly in patients with hematological disorders or undergoing intensive treatments.
    • Current practices in platelet transfusion vary significantly across institutions, impacting patient care and resource allocation.

    Purpose of the Study:

    • To analyze and compare the practices of platelet transfusions across multiple centers.
    • To evaluate the adherence to evidence-based guidelines for prophylactic platelet transfusions.

    Main Methods:

    • A retrospective analysis of 520 platelet transfusions from 8 different centers.
    • Data collection on transfusion indications, patient characteristics, target platelet counts, and preparation methods.

    Main Results:

    • Prophylactic platelet transfusions were administered 3.6 times more often than for active bleeding.
    • 67.5% of recipients had oncology diseases.
    • 25% of prophylactic transfusions were given to patients with platelet counts ≥30 x 10⁹/L, exceeding recommended thresholds.
    • Apheresis platelet concentrates were used in 76.7% of transfusions, and single-donor units were used more frequently than pooled platelets.

    Conclusions:

    • Significant variation exists in prophylactic platelet transfusion practices, with frequent administration in oncology patients.
    • Current transfusion targets for prophylaxis may be set higher than evidence-based recommendations.
    • Apheresis and single-donor units are the predominant methods for platelet concentrate preparation and administration.