Abstract: Provided are methods, for selectively analyzing a cell sample. Viable cells are dyed with a membrane-permeable fluorescent dye, and nonviable cells are dyed with a membrane-impermeable fluorescent quenching dye. The cells are illuminated to cause fluorescent emission from the membrane-permeable fluorescent dye in the viable cells and the membrane-impermeable fluorescent quenching dye in the non-viable cells. The cells are then quenched for at least a portion of fluorescence of the membrane-permeable fluorescent dye in the nonviable cells by the membrane-impermeable fluorescent quenching dye. The cells are then analyzed for viable and nonviable cells.

Abstract: Provided are methods, for selectively analyzing a cell sample. Viable cells are dyed with a membrane-permeable fluorescent dye, and nonviable cells are dyed with a membrane-impermeable fluorescent quenching dye. The cells are illuminated to cause fluorescent emission from the membrane-permeable fluorescent dye in the viable cells and the membrane-impermeable fluorescent quenching dye in the non-viable cells. The cells are then quenched for at least a portion of fluorescence of the membrane-permeable fluorescent dye in the nonviable cells by the membrane-impermeable fluorescent quenching dye. The cells are then analyzed for viable and nonviable cells.

Abstract: Provided are methods, for selectively analyzing a cell sample. Viable cells are dyed with a membrane-permeable fluorescent dye, and nonviable cells are dyed with a membrane-impermeable fluorescent quenching dye. The cells are illuminated to cause fluorescent emission from the membrane-permeable fluorescent dye in the viable cells and the membrane-impermeable fluorescent quenching dye in the non-viable cells. The cells are then quenched for at least a portion of fluorescence of the membrane-permeable fluorescent dye in the nonviable cells by the membrane-impermeable fluorescent quenching dye. The cells are then analyzed for viable and nonviable cells.

Abstract: Provided are methods, compositions, and kits for selectively analyzing a sample for viable cells and nonviable cells. For example, the method may include dyeing viable cells and/or nonviable with a membrane-permeable fluorescent dye, and dyeing nonviable cells with a membrane-impermeable fluorescent quenching dye. The method may include illuminating to cause fluorescent emission from the membrane-permeable fluorescent dye in the viable cells and the membrane-impermeable fluorescent quenching dye in the non-viable cells. The method may include quenching at least a portion of fluorescence of the membrane-permeable fluorescent dye in the nonviable cells by the membrane-impermeable fluorescent quenching dye. The method may include selectively analyzing the sample for the viable and nonviable cells.

Abstract: Provided are methods, for selectively analyzing a cell sample. Viable cells are dyed with a membrane-permeable fluorescent dye, and nonviable cells are dyed with a membrane-impermeable fluorescent quenching dye. The cells are illuminated to cause fluorescent emission from the membrane-permeable fluorescent dye in the viable cells and the membrane-impermeable fluorescent quenching dye in the non-viable cells. The cells are then quenched for at least a portion of fluorescence of the membrane-permeable fluorescent dye in the nonviable cells by the membrane-impermeable fluorescent quenching dye. The cells are then analyzed for viable and nonviable cells.

Abstract: Provided are systems and methods for obtaining a three-dimensional micro-tissue. For example, the system may include at least one cell culture device that may include one or more wells. Each well may include an opening at an upper surface of the cell culture device. Each well may include a bottom located towards a lower surface of the cell culture device. The bottom may be characterized by a bottom surface area inside each well. Each well may include a wall extending from the opening to the bottom surface area to define a total volume. Each well may be characterized by an aggregation factor greater than 800.

Abstract: Provided are systems and methods for obtaining a three-dimensional micro-tissue. For example, the system may include at least one cell culture device that may include one or more wells. Each well may include an opening at an upper surface of the cell culture device. Each well may include a bottom located towards a lower surface of the cell culture device. The bottom may be characterized by a bottom surface area inside each well. Each well may include a wall extending from the opening to the bottom surface area to define a total volume. Each well may be characterized by an aggregation factor greater than 800.

Abstract: This invention provides compositions and methods useful for the processing of a tissue sample and the preparation of cells, cell aggregates and/or tissue fragments. The invention provides two-stage filer devices and two-membrane devices. Cell aggregates and/or tissue fragments prepared using such devices and according to methods of the present invention can be used in a variety of assay systems, including, but not limited to, drug validation assays, drug screening assays, proliferation assays, metabolic assays, metastasis assays, angiogenesis assays, binding assays, biochemical assays, cellular assays, genetic assays, and the like.

Abstract: The present invention provides an image-based method of screening for compounds based on the measurement of internalization of a fluorescently labeled ligand. It further provides a multiplex method for high content screening of compounds wherein at least two cellular parameters are measured.