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Benedict's reagent (often called Benedict's qualitative solution or Benedict's solution) is a chemical reagent and complex mixture of sodium carbonate, sodium citrate, and copper(II) sulfate pentahydrate. [1] It is often used in place of Fehling's solution to detect the presence of reducing sugars and other reducing substances. [2]
Strains to be tested are streaked with known positive and known negative toxigenic strains on the agar's surface in a line across the plate, and at a right angle to the antitoxin paper strip. After incubation for 24 hours at 37 degrees Celsius , plates are examined with transmitted light for the presence of fine precipitin lines at a 45-degree ...
Negative reaction: Indicates that the person is immune. Combined reaction: Initial picture is like that of the pseudo-reaction but the erythema fades off after four days only in the control arm. It progresses on the test arm to a typical positive. The subject is interpreted to be both susceptible and hypersensitive.
Here "T+" or "T−" denote that the result of the test is positive or negative, respectively. Likewise, "D+" or "D−" denote that the disease is present or absent, respectively. So "true positives" are those that test positive (T+) and have the disease (D+), and "false positives" are those that test positive (T+) but do not have the disease (D ...
Formic acid (HCO 2 H) also gives a positive Fehling's test result, as it does with Tollens' (eponymous for Bernhard Christian Gottfried Tollens (1841 – 1918)) test and Benedict's solution also. The positive tests are consistent with it being readily oxidizable to carbon dioxide. The solution cannot differentiate between benzaldehyde and acetone.
A medical test is a medical procedure performed to detect, diagnose, or monitor diseases, disease processes, susceptibility, or to determine a course of treatment. Medical tests such as, physical and visual exams, diagnostic imaging, genetic testing, chemical and cellular analysis, relating to clinical chemistry and molecular diagnostics, are typically performed in a medical setting.
The true positive in this figure is 6, and false negatives of 0 (because all positive condition is correctly predicted as positive). Therefore, the sensitivity is 100% (from 6 / (6 + 0) ). This situation is also illustrated in the previous figure where the dotted line is at position A (the left-hand side is predicted as negative by the model ...
Norms help psychologists learn about individual differences. For example, a normed personality scale can help psychologists understand how some people are high in negative affectivity (NA) and others are low or intermediate in NA. With many psychoeducational tests, test norms allow educators and psychologists obtain an age- or grade-referenced ...