Abstract:
A detecting device is fitted so as to span a row of adjoining receptacles (5) which are set in a reciprocating continuous motion, so that each receptacle passes within the scanning field of the detecting device (18). The latter sends the signals sequentially to a processor (31) for elaboration into point curves showing the courses of each reaction through time. The row of receptacles (5) may be set in a reciprocating motion by a rack, a stepping motor, a cam-type control or a coupling device, etc.
Abstract:
Disclosed is a method for preparing dispersion gradients and an SPR injection method for determining full kinetics and affinity analysis in the presence of a competitor molecule. The SPR injection provides a dispersion gradient of two or more samples to a SPR flow cell and detector.
Abstract:
The invention relates to a method of characterizing interaction between two species in a liquid environment, wherein a liquid comprising said at least one species is passed as a flow through a measurement system, and wherein the interaction takes place within said measurement system. The method comprises generating a concentration gradient of at least a first one of said species or of at least one other species having an influence on the interaction or on interacted components. The flow of liquid is passed through a sensor device, and a result of interaction between said at least two species is detected. The flow of liquid is intersected at least once with a further liquid before the flow is passed through said sensor, so as to create at least two separated liquid segments having different concentrations of at least one of said species forming the concentration gradient.
Abstract:
A concentration measuring apparatus is provided having a reflective sensing media in a self-contained cassette (202), fiber optic line (302, 304) partially associated with a lamp (306) and a photocell (310). A signal is generated by the photocell (310) representative of the charge of reflectivity of the light from the reflective sensing media (600). The signal from the photocell (310) is accepted by a signal processor containing an amplifier (404), an analog to digital converter (430) and computer (480). An interface is associated with the signal processor and comprises a display (520) a 4-to-20 milliamp cord (530) and remote, explosion-proof switches (510) for operator interaction with the concentration measuring apparatus.
Abstract:
The present invention relates to a process to determine the concentration of any substance in a colorimetric, turbidimetric or nephelometric reaction using a fluorometric detector to measure fluorescence intensity. In particular, a change in color can be monitored by observing the measurement of fluorescence intensity of a fluorophore in an inert matrix. The absorption spectrum of the chromophore may overlap the excitation and/or emission spectrum of the fluorophore, thereby allowing the change in fluoroscence to be related to the intensity of color in the reaction and thus related to the quantity of the substance of interest.
Abstract:
A polychromatic light source (10) allows to illuminate a layer (14) of cell culture or fermentation, and an optical fiber (22) associated with a lens (18) and with a mirror (20) allows to collect the light transmitted and diffused by the medium. Means (24) for spectral analyses, associated with calculation means (26), allow to determine the pH and the cell concentration of the culture medium (14) which contains a colored indicator of which the tint varies as a function of the pH.
Abstract:
The peak verify time for kinetic nephelometric measurements of reactions between antigens and antibodies is adjusted as a function of the magnitude of the peak rate in order to reduce the time required for peak verification. The scatter signal is zeroed following the end of the peak verification period and the reaction is tested for antigen excess. Reactions during the antigen excess check having rates that exceed a threshold value are accepted as being valid, and no additional measurements are made for such samples. Reactions during the antigen excess check having rates that are less than the threshold value are rejected as being in antigen excess. Samples found to be in antigen excess are diluted and then reanalyzed.
Abstract:
Disclosed is a method for preparing dispersion gradients and an SPR injection method for determining full kinetics and affinity analysis in the presence of a competitor molecule. The SPR injection provides a dispersion gradient of two or more samples to a SPR flow cell and detector.
Abstract:
The invention relates to a method of characterizing interaction between two species in a liquid environment, wherein a liquid comprising said at least one species is passed as a flow through a measurement system, and wherein the interaction takes place within said measurement system. The method comprises generating a concentration gradient of at least a first one of said species or of at least one other species having an influence on the interaction or on interacted components. The flow of liquid is passed through a sensor device, and a result of interaction between said at least two species is detected. The flow of liquid is intersected at least once with a further liquid before the flow is passed through said sensor, so as to create at least two separated liquid segments having different concentrations of at least one of said species forming the concentration gradient.
Abstract:
An apparatus for the determination of analytes in liquid samples is disclosed. The apparatus comprises in fluid connection a positive-displacement pump (18), a chamber (16) in which the reagents specific for the analytes to be determined can be delivered, a detector (23), a second chamber (43) and a device (4) for the introduction of sample within the circuit and for the discharge. The apparatus also provides for controlling flow means and means (7) for the control of the operation of each component. A process for the determination of said analytes is also disclosed.