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Physiology of the Genitourinary System III: Urine Concentration and Dilution01:20

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The kidneys concentrate or dilute urine to maintain water and electrolyte balance. Nephrons, particularly the loop of Henle, play a crucial role in this process through the countercurrent multiplication system. This system establishes a high osmolarity in the renal medulla, which is essential for water reabsorption. In the loop of Henle’s descending limb, water is reabsorbed into the surrounding medulla due to its permeability to water. In contrast, the ascending limb actively transports...
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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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The relative amount of a given solution component is known as its concentration. Often, though not always, a solution contains one component with a concentration that is significantly greater than that of all other components. This component is called the solvent and may be viewed as the medium in which the other components are dispersed or dissolved. Solutions in which water is the solvent are, of course, very common on our planet. A solution in which water is the solvent is called an aqueous...
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The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
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Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
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The rate of a reaction is affected by the concentrations of reactants. Rate laws (differential rate laws) or rate equations are mathematical expressions describing the relationship between the rate of a chemical reaction and the concentration of its reactants.
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Quantifying Yersinia pseudotuberculosis Type III Secretion System Activity Following Iron Starvation and Anaerobic Growth
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Pasteurisation induced changes in an antithrombin III concentrate.

L Winkelman, M E Haddon

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    Heating therapeutic antithrombin III (AT III) concentrates with citrate causes a loss of AT III activity and heparin binding. Protein aggregates form, but they are impurities, not AT III itself.

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    Area of Science:

    • Biochemistry
    • Protein Chemistry
    • Therapeutic Protein Analysis

    Background:

    • Antithrombin III (AT III) is a crucial anticoagulant protein.
    • Therapeutic AT III concentrates are used in treating coagulation disorders.
    • Understanding the stability of AT III under various conditions is vital for its efficacy.

    Purpose of the Study:

    • To investigate the effects of heating therapeutic antithrombin III (AT III) concentrates in the presence of citrate ions.
    • To characterize changes in AT III activity and binding properties upon heating.
    • To identify the nature of protein aggregates formed during this process.

    Main Methods:

    • Therapeutic AT III concentrate was subjected to heating in the presence of citrate.
    • Assays were performed to measure heparin cofactor antithrombin activity.
    • Heparin binding ability was assessed.
    • Protein aggregation was analyzed.

    Main Results:

    • A notable loss of heparin cofactor antithrombin activity was observed.
    • The ability of AT III to bind heparin was diminished.
    • Formation of protein aggregates was detected during the heating process.
    • Analysis confirmed these aggregates were impurities, not derived from AT III.

    Conclusions:

    • Heating therapeutic AT III concentrates with citrate leads to a reduction in anticoagulant function.
    • Citrate and heat induce the formation of non-AT III protein aggregates.
    • These findings highlight the importance of controlled storage and handling conditions for AT III concentrates.