A mulitwell plate having a plurality of picowells on the bottom of the wells of the plate as well as methods of producing the mulitwell plate are provided. Provided is also a method of handling living cells by providing an ordered array of living cells immobilized in a non-fluid matrix, contacting t
A mulitwell plate having a plurality of picowells on the bottom of the wells of the plate as well as methods of producing the mulitwell plate are provided. Provided is also a method of handling living cells by providing an ordered array of living cells immobilized in a non-fluid matrix, contacting the living cells with a stimulus; and detecting a response to the stimulus. The present invention is also of a method of producing an ordered array of living cells.
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1. A multiwell plate comprising a unitary structure including a plurality of wells wherein the bottom surface of at least one well of said plurality of wells includes a plurality of picowells, wherein said picowells are unitary structures each comprised of a bottom and a side wall integrally formed
1. A multiwell plate comprising a unitary structure including a plurality of wells wherein the bottom surface of at least one well of said plurality of wells includes a plurality of picowells, wherein said picowells are unitary structures each comprised of a bottom and a side wall integrally formed with said bottom, and the bottoms and side walls of said picowells include a coating of a material that inhibits or delays adherence of cells in said picowells. 2. The plate of claim 1, having a footprint of a standard multiwell plate. 3. The plate of claim 1, wherein said plurality of wells comprises 6n wells arranged in a 2n×3n array, where n is an integer greater than 0. 4. The plate of claim 3, wherein said plurality of wells is selected from the group consisting of 6, 24, 96, 384 and 1536 wells. 5. The plate of claim 1, wherein picowells of said plurality of picowells are juxtaposed. 6. The plate of claim 5, wherein the interwell area between two said picowells is less than about 0.35 times the sum of the areas of said two picowells. 7. The plate of claim 5, wherein a rim of a said picowell is substantially knife-edged. 8. The plate of claim 1, wherein said plurality of picowells comprises picowells having dimensions of less than about 200 microns. 9. The plate of claim 1, wherein all picowells of the plate are substantially identical in size. 10. The plate of claim 1, wherein a first well includes a first plurality of picowells and a second well includes a second plurality of picowells, wherein said first plurality of picowells and said second plurality of picowells are substantially different. 11. The plate of claim 1, further including at least one distinct picowell-bearing component, said picowell-bearing component being attached to said bottom surface of said one well as part of said unitary structure. 12. The plate of claim 11, wherein said picowell-bearing component comprises a gel. 13. The device of claim 12, wherein the water content of said gel is greater than about 80% by weight. 14. The device of claim 12, wherein said gel comprises an active entity. 15. The plate of claim 1, wherein the bottoms of said picowells have an index of refraction similar to that of water. 16. The plate of claim 15, wherein said index of refraction is less than about 1.4. 17. The plate of claim 1, further comprising a gel cover covering said plurality of picowells. 18. The plate of claim 1, wherein said plurality of picowells covers substantially the entire said bottom surface of said well. 19. The device of claim 1, wherein a cross-section of said picowells is hexagonal, rectangular, triangular, or circular. 20. The device of claim 1, wherein the volume of said picowells is in the range of less than about 10−12 to about 10−15 liters. 21. The device of claim 1, wherein the volume of said picowells is in the range of about 10−11 to about 10−12 liters. 22. A multiwell plate comprising a unitary structure including a plurality of wells wherein at the bottom surface of at least one well of said plurality of wells is includes a plurality of picowells, wherein said picowells are unitary structures each comprised of a bottom and a side wall integrally formed with said bottom, and wherein the bottoms and side walls of said picowells include a coating of a material that affects proliferation of cells in said picowells. 23. The device of claim 22, wherein the bottom surfaces of said plurality of wells is formed substantially of a material having an index of refraction between that of water and about 1.4. 24. The device of claim 22, further comprising a gel covering said plurality of picowells. 25. The device of claim 22, wherein the inter picowell area between two picowells is less than or equal to about 0.35 times the sum of the areas of the two picowells. 26. The device of claim 22, wherein rims of a said picowells are substantially knife-edged. 27. The device of claim 22, wherein the dimensions of said picowells are less than about 200 microns. 28. The device of claim 22, wherein the volume of said picowells is in the range of less than about 10−12 to less than about 10−15 liters. 29. A device according to claim 22, wherein the multi-well plate has a footprint of a standard multi-well plate. 30. A device according to claim 22, wherein picowells of said plurality of picowells are juxtaposed. 31. A device according to claim 22, wherein said plurality of picowells comprise enclosures of dimensions such that substantially an entire cell of a certain size can be held within a said enclosure, each said enclosure having an opening, said opening defined by a first cross section of a size allowing passage of a cell of a certain size. 32. A device according to claim 22, further including at least one distinct picowell-bearing component, said picowell-bearing component being attached to said bottom surface of said one well as part of said unitary; structure. 33. The plate of claim 32, wherein said plurality of picowells comprise enclosures of dimensions such that substantially an entire cell of a certain size can be held within a said enclosure, each said enclosure having an opening, said opening defined by a first cross section of a size allowing passage of a cell of a certain size. 34. The device of claim 32, wherein said picowell bearing component is formed of a gel. 35. The device of claim 34, wherein the gel contains water, the water content of said gel being greater than about 80% by weight of said gel. 36. The device of claim 34, wherein said gel includes an active entity. 37. A device according to claim 32, wherein said wells are configured to hold a single cell of a certain type or a predetermined maximum number of cells of said certain type. 38. A device according to claim 22, wherein a cross-section of said picowells is hexagonal, rectangular, triangular, or circular. 39. A device according to claim 38, wherein the rims of said picowells are substantially knife-edged. 40. A device according to claim 22, wherein the volume of said picowells is in the range of about 10−11 to about 10−12 liters. 41. A device according to claim 22, wherein said picowells are configured to hold a single cell of a certain type or a predetermined maximum number of cells of said certain type. 42. A device according to claim 22, wherein said coating is of a material that inhibits or delays proliferation of cells in said picowells. 43. A method of making a multiwell plate comprised of an integral structure formed of a plurality of wells and a plurality of picowells on the bottom of at least one of said wells, the method comprising: (a) placing a precursor material on a substrate;(b) contacting said precursor material with a template including a negative of one or more features of said plate including said picowells;(b) fixing said one or more features in said precursor material so as to fashion an incipient plate; and(c) processing said incipient plate so as to fashion said unitary structure of said plurality of wells and said plurality of picowells with said picowells attached to a bottom surface of at least one of said wells as part of said unitary structure; and(d) coating the bottoms and side walls of said picowells with a material that affects proliferation of cells in said picowells. 44. The method of claim 43, further comprising: (e) prior to contacting the precursor material with the template, placing said precursor material in a well of a multiwell plate. 45. The method of claim 43, further comprising: (f) subsequent to fixing said one or more features in said precursor material, attaching walls of said plurality of wells to said incipient plate to form part of said integral structure. 46. The method of claim 43, wherein said precursor material comprises an irreversibly deformable precursor material and said fixing said features comprises separating said template from said precursor material. 47. The method of claim 43, wherein said precursor material comprises a reversibly deformable precursor material and the features are fixed while said template is in contact with the precursor material. 48. The method of claim 43, wherein said template contains a negative of said plurality of picowells. 49. The method of claim 43, wherein said precursor material is plastically deformable and said features are fixed by separating said template from said precursor material. 50. The method of claim 43, wherein said precursor material is an elastic material. 51. The method of claim 43, wherein said precursor material is a gel, and said features are fixed by gelling said gellable fluid. 52. The method of claim 51, wherein the water content of said gel is greater than about 80% by weight. 53. The method of claim 51, wherein said gel comprises an active entity. 54. The method of claim 43, wherein said precursor material is irreversibly deformable and said features are fixed by separating said template from said precursor material. 55. The method of claim 43, wherein said precursor is a photoresist material; and said picowells are fixed in said photoresist material. 56. The method of claim 43 wherein the coating material delays or inhibits adherence of cells in said wells. 57. The method of claim 43 wherein the coating material delays or inhibits proliferation of cells in said picowells. 58. The method of claim 43, further comprising: (g) providing a gel cover configured to cover said plurality of picowells.
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