Abstract:
An imaging assembly for the viewing, imaging, and analysis of chemiluminescent or bioluminescent samples in gels or other substrates, in which an adjustable camera and lens module having a prime or fixed lens or a focusing lens is moved to change the field of view by shifting the focal plane of the camera and lens module. The imaging assembly can also include a mirror to bend or fold the optical path between the camera and lens module and the target area having a sample, in which the mirror can move in the same vertical direction as the camera and lens module. Further, the camera and lens module can be configured to more move in a diagonal direction relative to the location of the imaging target area. The imaging assembly can further have a duct system adaptable to adjust with the movement of the camera and lens module.
Abstract:
Molecular species that are immobilized in discrete locations on a planar support such as protein bands on a gel or a blotting membrane or species applied in dots or spots on a membrane are reacted with binding reagents that are applied through a porous hydrophilic transfer sheet placed over the planar support, the sheet having at least one region that is laterally bordered by a barrier with the binding reagent retained within the bordered region. The bordered region is placed directly over an area on the planar support where the molecular species are expected to reside if they are present on the support. The binding reagent is then delivered into the support to contact the species. Targeted delivery of the binding reagent is thus achieved with improved efficiency.
Abstract:
Methods of purifying an adenovirus from an impure preparation are provided. In some embodiments, a combination of mixed mode chromatography and anion exchange chromatography is used to purify the adenovirus.
Abstract:
Disclosed is a sheath delivery system that uses a continuous flow of sheath fluid into a pressurized internal reservoir that substantially matches the outflow of sheath fluid through the nozzle of a flow cytometer. A substantially constant level of the sheath fluid is maintained. If the sheath fluid level falls below a desired level, or goes above a desired level, a dampened control system is used to reach the desired level. In addition, air pressure in the pressurized internal container is controlled so that an external sheath container can be removed and refilled with additional sheath fluid without stopping the sheath delivery system 100. Differences in pressure are detected by a droplet camera, which measures the droplet breakoff point to determine the pressure of the sheath fluid in the nozzle.
Abstract:
Modified Protein A, Protein G, Protein L, or Protein A/G that lacks antibody binding activity, and methods of the modified protein's use for purifying antibodies is provided.
Abstract:
Methods, apparatuses, and systems are disclosed for analyzing quality control (QC) strategies that are applied to testing processes an analyte in order to meet an acceptable level of probability of patient harm that could result from incorrect test results. The measure of patient harm takes into account severity of patient harm, as well as its occurrence. Methods include calculating, based on the parameters of the QC strategies and the test apparatus, an expected number of incorrect final results E(Nuf) due to a test system failure. The value of E(Nuf) can be used as part of a calculation of a predicted level of probability patient harm. The ratio of the acceptable level of probability of patient harm to the predicted level of probability patient harm can determine the adequacy of the QC strategies.
Abstract:
Sample analysis systems and methods are provided. In one embodiment, the method may be achieved by applying a substance to a surface of a substrate having a first binding agent immobilized thereon; removing unbound material from at least a portion of the substrate having the substance applied thereon; applying a second binding agent to the surface of the substrate, wherein the second binding agent is optically labeled or unlabeled; removing unbound material from at least a portion of the substrate having the second binding agent applied thereon; responsive to detecting the optically labeled second binding agent bound to the substance, identifying the analyte present in the sample; and responsive to not detecting the optically labeled second binding agent bound to the substance, determining that the analyte is absent in the sample; wherein the applying the substance or second binding agent to the surface of the substrate steps are concurrent with the respective removing unbound material from at least a portion of the substrate steps. Systems and other methods are also described and illustrated.
Abstract:
Systems and methods are provided for analyzing data to determine properties of a PCR processor other process exhibiting amplification or growth. Data representing an amplification can be distinguished from data representing a jump or other error. A modified sigmoid function containing a drift term may be used in determining the properties. A multi-stage functional fit of the amplification data can provide increased accuracy and consistency of one or more of the properties. A baseline of the amplification data can be determined by analyzing an integrated area of a first derivative function of the data. A reference quantitation value can also be determined from locations of maxima of different derivative functions of the amplification data, e.g., a weighted average of the maxima locations for the second and third derivatives may be used.
Abstract:
Systems, methods, and apparatuses are provided for identifying an optimal spectral match and potentially display the compared spectra. A sample spectrum of a sample substance can be compared to reference spectra to identify matches, thereby determining possibilities for what the sample substance is. Correction parameter(s) may be used for the sample spectrum and/or the reference spectrum. Initial value(s) for the correction parameter(s) can be applied to the sample spectrum and/or a reference spectrum, and a similarity score can be determined. The value(s) for the correction parameter(s) can be updated and iteratively improved to provide an optimal similarity score that satisfies a convergence criterion. Data about the reference substances having optimal similarity scores that are above a threshold can be output to a user, e.g., the reference spectra can overlay the sample spectrum. A user can then make a final determination of which reference substance corresponds to the sample substance.
Abstract:
Methods and compositions are described herein for protecting RNA from autocatalytic and divalent cation induced degradation in an aqueous solution.