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Devices and methods that measure one or more properties of a living cell culture that is contained in liquid media within a vessel, and typically analyzes plural cell cultures contained in plural vessels such as the wells of a multiwell microplate substantially in parallel. The devices incorporate a

Devices and methods that measure one or more properties of a living cell culture that is contained in liquid media within a vessel, and typically analyzes plural cell cultures contained in plural vessels such as the wells of a multiwell microplate substantially in parallel. The devices incorporate a sensor that remains in equilibrium with, e.g., remains submerged within, the liquid cell media during the performance of a measurement and during addition of one or more cell affecting fluids such as solutions of potential drug compounds.

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1. A high-throughput cellular assay method comprising the steps of: disposing cells in media in multiple wells of a multiwell plate;moving into the medium in multiple wells at least a portion of sensors configured to sense the concentration of a dissolved constituent absorbed by or secreted from cel

1. A high-throughput cellular assay method comprising the steps of: disposing cells in media in multiple wells of a multiwell plate;moving into the medium in multiple wells at least a portion of sensors configured to sense the concentration of a dissolved constituent absorbed by or secreted from cells in the medium in the wells;delivering to multiple wells a test fluid from test-fluid-containing ports disposed in a cartridge above the respective wells while the sensors are disposed in the medium in the wells; andmeasuring within the medium the presence or concentration of said dissolved constituent in multiple wells by detecting signals from the sensors disposed in the medium; anddetermining a property of the cells in the respective well on the basis of the measured presence or concentration of said dissolved constituent. 2. The method of claim 1 wherein the test fluids are delivered to each of the multiple wells simultaneously, and the concentrations of constituents are measured in each of the multiple wells simultaneously. 3. The method of claim 1 wherein the same constituent is measured in each of the multiple wells. 4. The method of claim 1 wherein multiple constituents are measured in the multiple wells. 5. The method of claim 1 wherein the test fluids in respective wells comprise the same test fluid. 6. The method of claim 1 further comprising repeating the delivering and the detecting steps after a first detection. 7. The method of claim 6 wherein a different test fluid is delivered after the first detection. 8. The method of claim 1 comprising maintaining substantially thermal and constituent concentration equilibrium between the sensors and the media during the delivery step. 9. The method of claim 1 wherein the sensors comprise a fluorescent sensor. 10. The method of claim 1 wherein each of the test fluids comprises at least one of a drug, a drug candidate, a toxin, or a nutrient. 11. The method of claim 10 further comprising repeating the delivering and the detecting steps after a first detection, using second test fluids comprising different concentrations of at least one of a drug, a drug candidate, or a toxin. 12. The method of claim 10 wherein a concentration of the at least one of a drug, a drug candidate, or a toxin is known prior to delivery of the test fluid. 13. The method of claim 1 wherein the constituent is selected from the group consisting of CO2, O2, H+, Ca++, NH3, Na+, and K+. 14. The method of claim 1 wherein the constituent is selected from the group consisting of cytokines, chemokines, hormones, antibodies, glucose, fatty acids, amino acids, glutamine, glycogen, and pyruvate. 15. The method of claim 14 wherein the hormones comprise insulin. 16. The method of claim 1 wherein the media are bicarbonate-free. 17. The method of claim 1 wherein the cells comprise animal cells. 18. The method of claim 1 wherein the sensors comprise an electrochemical sensor. 19. The method of claim 1 wherein the property of the cells comprises at least one of cell viability or metabolic rate. 20. The method of claim 1 wherein delivering test fluids to the multiple wells comprises delivering test fluids having different concentrations of a drug, a drug candidate, or a toxin to multiple wells. 21. The method of claim 1 wherein delivering test fluids to the multiple wells comprises pressurizing the test-fluid-containing ports. 22. The method of claim 1 wherein the cartridge defines a plurality of sensor sleeves and the sensors are disposed on the sensor sleeves. 23. The method of claim 1 wherein the cartridge defines a plurality of sensor sleeves adapted to receive the sensors.