Abstract:
The present invention provides a method for quantifying moving heterologous nanoparticles in a suspension by imaging. The quantifying method comprises acquiring at least one z-stack of images within the suspension; tracking the nanoparticles in the images to identify unique nanoparticles; and enumerating the unique nanoparticles. Also provided is a method for characterizing size distribution of moving heterologous nanoparticles in a suspension by imaging. The characterization method comprises acquiring time lapse images; tracking the nanoparticles in the images to identify unique nanoparticles; determining the locations of each of the unique particles; determining the size of each of the unique nanoparticles; and aggregating the sizes of the unique nanoparticles.
Abstract:
The present disclosure describes fluid-wicking membranes, methods of making fluid-wicking membranes, and flow assay membranes. In one example, a fluid-wicking membrane can include a substrate and a porous coating layer over the substrate. The porous coating layer can include silica particles bound together by a polymeric binder. The silica particles can have an average particle size from greater than 1 pm to 50 pm. The porous coating layer can also include a surface-activating agent activating surfaces of the silica particles. The surface-activating agent can include aluminum chloride hydrate, a trivalent metal oxide, a tetravalent metal oxide, or a combination thereof.
Abstract:
A light-emitting marker having a light-emitting core comprising a light-emitting material bound to a first biotin group and a biomolecule bound to a second biotin group. A protein, e.g. streptavidin or neutravidin, is bound to the first and second biotin groups. The light- emitting marker may be a light-emitting marker particle having a particulate core.
Abstract:
An apparatus attaches to a microscope slide to form an enclosed fluidic chamber with input and output ports, where a tissue or cell sample on the slide can be processed using techniques such as immunohistochemical staining. Flow of reagents within the chamber can be laminar and highly uniform across the sample surface to achieve staining that is free of gradients. The sample can be imaged prior to, during, or after any given processing step. Methods for staining and imaging a sample can be implemented through one or more rounds of labeling, label removal or erasure and imaging. Samples can be imaged many times to achieve very high multiplexing levels. Samples can be placed on an imaging apparatus at various times and removed from the imaging apparatus for certain steps.
Abstract:
Textured surfaces for analytical tests such as microarrays wherein the microfeatures and microstructures of the textured surface comprise metal nanoparticles, wherein biomolecules labeled with detection moieties may further be attached to the microfeatures and microstructures. When stimulated by electromagnetic radiation, the metal nanoparticles interact with the detection moieties in a manner that allows for increased fluorescence signaling. The microfeatures and microstructures of the textured surface space the nanoparticles at distances and can help put the nanoparticles in proximity to the labeled biomolecules. The fluorescence signal intensity is amplified due to the textured surface allowing for an increase in biomolecule binding and metal nanoparticle binding, as well as the interactions of the metal nanoparticles and fluorescent molecules.
Abstract:
Improved methods for detecting active tuberculosis are disclosed. A method comprises enriching at least one M. tuberculosis- specific biomolecule from a sample by contacting the sample with a nanoporous film; and detecting the presence of the M. tuberculosis-specific biomolecule or fragment(s) thereof. The method may further comprise digesting the enriched M. tuberculosis -specific biomolecule with an enzyme to produce a digestion product comprising at least one fragment of the M. tuberculosis -specific biomolecule. Improved sensitivity and speed achieved.
Abstract:
The present invention relates to complexes of silica-containing materials and peptide linkers for the capture of biological and chemical entities. In particular, the present invention relates to the use of complexes of silica-containing materials and peptide linkers comprising capture moieties for the capture of biological and chemical entities.