Finding:

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   Titration

   In simple acid-base titrations a pH indicator may be used, such as phenolphthalein, which becomes pink when a certain pH (about 8.2) is reached or exceeded. ... A measured amount of the sample can be given in the flask and then be dissolved or diluted.
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   Chemotaxis assay

   In general, the most important requisite to calibrate the incubation time of the assay both to the model cell and the ligand to be evaluated. ... Some of them are only qualitative, like aggregation tests, where small pieces of agar or filters are placed onto a slide and accumulation of cells around is measured.
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   Von Willebrand disease

   This is achieved by measuring the amount of vWF in a vWF antigen assay and the functionality of vWF with a glycoprotein (GP)Ib binding assay, a collagen binding assay or, a ristocetin cofactor activity (RiCof) or ristocetin induced platelet agglutination (RIPA) assays.
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   Enzyme assay

   Amounts of enzymes can either be expressed as molar amounts, as with any other chemical, or measured in terms of activity, in enzyme units. ... For example, figure 1 shows the coupled assay for the enzyme hexokinase, which can be assayed by coupling its production of glucose-6-phosphate to NADPH production, using glucose-6-phosphate dehydrogenase.
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   Assay

   An assay is a procedure where a property or concentration of an analyte is measured. ... It also measures the content of the other alloying metals present.
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   Bradford protein assay

   Because the Bradford assay essentially measures the amount of arginine and hydrophobic amino acid residues, the amino acid composition can alter the concentration-absorbance curve depending on the percentage of arginine or hydrophobic amino acids in each protein. ... The nonlinearity issue of the Bradford assay may be solved by measuring the ratio of OD at 595 to 450 nm.
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   Assay office

   Glasgow (closed 1964) ... Historic Netherlands assay offices (up to 1988)
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   Kammerlader

   This conclusion was reached after having observed the American Revolutionary War, the Napoleonic Wars and the short Swedish campaign against Norway in 1814. ... A pre measured amount of gunpowder is poured into the breech, and the paper from the paper cartridge is used as wadding.
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   Paper cartridge

   While these may be loaded with loose powder and balls or bullets, a paper cartridge combines a pre-measured amount of powder with the ball in a sealed unit. ... This can be helped by using a lubricant, which serves not only to help the ball slide down the barrel, but also serves to soften the fouling in the bore, so that it is pushed clear during loading.
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    Time

    As of 2006[update], the smallest unit of time that has been directly measured is on the attosecond (10−18 s) time scale, or around 1026 Planck times. ... If inflation occurred this is likely, for exponential expansion would push large regions of space beyond our observable horizon.

Explore the following pages on Powerset:

• Titration,
• Chemotaxis assay,
• Von Willebrand disease,
• Enzyme assay,
• Assay,
• Bradford protein assay,
• Assay office,
• Kammerlader,
• Paper cartridge,
• Time