To determine iron in serum by the release of bound iron and reduction of the released iron to Fe.sup.2+, a first solution of a denaturing agent at a concentration of 1 to 8 mol/l is added to the serum, then a second solution is added which contains the color reagent and likewise a denaturing agent at a concentration of 1 to 8 mol/l and subsequently the colored complex is measured photometrically.

A high speed, luminescence detection arrangement for sequentially measuring the luminescence emitted from a plurality of luminescence sources under test. A tray holder contains a plurality of cup-like sample wells, from which the luminescent radiation is emitted, and each of the cup-like sample wells is sequentially positioned in a predetermined location to allow the detection and measurement of the intensity of the luminescence emitted therefrom. Displays are provided to provide a detectible di...

A photoactive moiety exhibiting an anisotropic transition dipole. The moiety exhibits emission of polarized light in response to energy absorption. In a preferred embodiment, the moiety comprises a particle from the group consisting of a crystalline arrangement of photoactive molecules and a photoactive nanocrystal. The moiety may include a matrix in which photoactive objects exhibiting an anisotropic emission dipole are embedded. The moiety may be photobleached to product the anisotropy and the...

A system for handling liquid samples, comprising at least two superposed and interconnected planar elements between which a well for a liquid sample is formed which extends between an outwardly leading mouth to receive and/or deliver a liquid sample and an outwardly leading passage to connect the well to a displacement device for air or another gas.

A fluidic medical diagnostic device permits measurement of analyte concentration or a property of a biological fluid, particularly the coagulation time of blood. The device has at one end a sample port for introducing a sample and at the other end a bladder for drawing the sample to a measurement area. A channel carries the sample from the sample port to the measurement area, and a stop junction, between the measurement area and bladder, halts the sample flow. The desired measurement can be made...

This invention is directed to probes that are removably insertable into mass spectrometers. The probes have sample presenting surfaces, at least, that contain non-metallic materials. The probes are useful in methods of desorbing analytes from the probe surface. The invention also is directed to detection systems that include the probes and methods of detecting analytes using the system.

A weathering test method comprising making active oxygen and light simultaneously act on a test piece, a weathering test method comprising successive and/or alternate steps of making active oxygen and light simultaneously act on a test piece and making at least one of light, oxygen, and water to act on the test piece, and apparatus for carrying out the methods are disclosed. In evaluating weatherability of organic materials, articles made of organic materials or articles coated with organic mate...

A portable, inexpensive, and easy to operate vehicle oxygen sensor analyzer shows, in real time, on an ultra-bright LED display, the dynamic operation of the oxygen sensor, simulates sensor signals into the computer, while monitoring the oxygen sensor to confirm correct computer operation, and performs a quick, simple and accurate test on the oxygen sensor to prove that it will pass emissions tests for oxygen sensors of the type typically required under emissions control regulations.

Microfluidic devices, assemblies, and systems are provided, as are methods of manipulating micro-sized samples of fluids. Microfluidic devices having a plurality of specialized processing features that facilitate centripetal fluid transfer are also provided.

This invention relates generally to methods and apparatus for desorption and ionization of analytes for the purpose of subsequent scientific analysis by such methods, for example, as mass spectrometry or biosensors. More specifically, this invention relates to the field of mass spectrometry, especially to the type of matrix assisted laser desorption/ionization, time-of-flight mass spectrometry used to analyze macromolecules, such as proteins or biomolecules. Most specifically, this invention rel...