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The enzyme unit, or international unit for enzyme (symbol U, sometimes also IU) is a unit of enzyme's catalytic activity. [ 1 ] 1 U (μmol/min) is defined as the amount of the enzyme that catalyzes the conversion of one micro mole of substrate per minute under the specified conditions of the assay method .
Multiplex-PCR consists of multiple primer sets within a single PCR mixture to produce amplicons of varying sizes that are specific to different DNA sequences. By targeting multiple sequences at once, additional information may be gained from a single test run that otherwise would require several times the reagents and more time to perform.
The last 10-12 bases at the 3' end of a primer are sensitive to initiation of polymerase extension and general primer stability on the template binding site. The effect of a single mismatch at these last 10 bases at the 3' end of the primer depends on its position and local structure, reducing the primer binding, selectivity, and PCR efficiency.
Breakpoints for the same organism and antibiotic may differ based on the site of infection: [29] for example, the CLSI generally defines Streptococcus pneumoniae as sensitive to intravenous penicillin if MICs are ≤0.06 μg/ml, intermediate if MICs are 0.12 to 1 μg/ml, and resistant if MICs are ≥2 μg/ml, but for cases of meningitis, the ...
Test Negative Equivocal Positive Unit anti-SS-A (Ro) < 1.0 [164] n/a: ≥ 1.0 [164] Units (U) anti-SS-B (La) < 1.0 [165] n/a: ≥ 1.0 [165] Anti ds-DNA < 30.0 [166] 30.0–75.0 [166] > 75.0 [166] International Units per millilitre (IU/mL) Anti ss-DNA < 8 [167] 8–10 [167] > 10 [167] Units per millilitre (U/mL) Anti-histone antibodies < 25 [167 ...
The "A260 unit" is used as a quantity measure for nucleic acids. One A260 unit is the amount of nucleic acid contained in 1 mL and producing an OD of 1. The same conversion factors apply, and therefore, in such contexts: 1 A260 unit dsDNA = 50 μg 1 A260 unit ssDNA = 33 μg 1 A260 unit ssRNA = 40 μg
Add 100 μL of each of the above to separate tubes (use microcentrifuge tubes) and add 1.0 mL of Coomassie Blue to each tube. Turn on and adjust a spectrophotometer to a wavelength of 595 nm, and blank the spectrophotometer using 1.5 mL cuvettes or use a mobile smartphone camera ( RGBradford method).
The cutoff normal individuals from those with primary hyperaldosteronism is significantly affected by the conditions of testing, such as posture and time of day. On average, an ARR cutoff of 23.6 ng/dL per ng/(mL·h), expressed in alternative units as 651 pmol/L per μg/(L·h), has been estimated to have a sensitivity of 97% and specificity of 94%. [2]