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A lid for a sample holder that includes a load port, a first flow channel, and a second flow channel. The first flow channel includes a first end connected to the load port and a second end that opens into a first reservoir of the sample holder. The second flow channel also includes a first end conn

A lid for a sample holder that includes a load port, a first flow channel, and a second flow channel. The first flow channel includes a first end connected to the load port and a second end that opens into a first reservoir of the sample holder. The second flow channel also includes a first end connected to the load port and a second end that opens into a second reservoir of the sample holder.

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We claim: 1. A lid for a sample holder, the sample holder having a plurality of reservoirs, the lid comprising: a load port configured to receive a volume of fluid; and a plurality of flow channels; wherein each said flow channel has a length and a cross-sectional diameter, a first end connected to

We claim: 1. A lid for a sample holder, the sample holder having a plurality of reservoirs, the lid comprising: a load port configured to receive a volume of fluid; and a plurality of flow channels; wherein each said flow channel has a length and a cross-sectional diameter, a first end connected to said load port, and a second end that opens into a single reservoir of said plurality of reservoirs when the lid covers the sample holder, and wherein when the volume of fluid is received in the load port, the respective lengths and cross-sectional diameters of the plurality of flow channels are the same or different as required to distribute the volume of fluid received in the load port in approximately equal amounts to each reservoir of the plurality of reservoirs. 2. The lid of claim 1, wherein at least a first flow channel and a second flow channel of said plurality of flow channels have equal lengths. 3. The lid of claim 2, wherein said load port is disposed at the center of the lid. 4. The lid of claim 1, wherein said load port is configured to interface with a fluid-dispensing device. 5. The lid of claim 4, wherein said fluid-dispensing device is a syringe. 6. The lid of claim 5, wherein said load port includes a threaded locking mechanism. 7. The lid of claim 4, wherein said fluid-dispensing device is a pipette. 8. The lid of claim 1, wherein each said flow channel is siliconized. 9. The lid of claim 1, wherein each said flow channel is configured to allow fluid to pass from said first end to said second end of each said flow channel by pressure. 10. The lid of claim 1, wherein each said flow channel is configured to allow fluid to pass from said first end to said second end of each said flow channel by capillary action. 11. The lid of claim 1, wherein each said flow channel is configured to allow fluid to passively flow from said first end to said second end of each said flow channel. 12. The lid of claim 1, wherein a first flow channel of said plurality of flow channels includes at least one curved segment. 13. The lid of claim 1, wherein a first flow channel of said plurality of flow channels includes at least one straight segment. 14. The lid of claim 1, wherein the second end of a first flow channel of said plurality of flow channels ends in a beveled tip. 15. The lid of claim 1, wherein the second end of a first flow channel of said plurality of flow channels is positioned at a distance from a surface of a first reservoir of said plurality of reservoirs when the lid covers the sample holder, and wherein said distance allows fluid from said second end to contact the surface to draw the fluid from said second end by surface tension. 16. The lid of claim 15, wherein said distance is about 0.5 mm. 17. The lid of claim 1, wherein the lid is removably attached to a section of the sample holder by an attachment mechanism. 18. The lid of claim 17, wherein said attachment mechanism forms an air-tight seal between the lid and said section. 19. The lid of claim 1, wherein the lid is fixed to a section of the sample holder by an attachment mechanism. 20. The lid of claim 19, wherein said attachment mechanism forms an air-tight seal between the lid and said section. 21. The lid of claim 1, wherein the lid is fused to the sample holder. 22. The lid of claim 1, further comprising a ring disposed near the second end of a first flow channel of said plurality of flow channels. 23. The lid of claim 22, wherein said ring positions said second end of said first flow channel with respect to a first reservoir. 24. The lid of claim 23, wherein said ring allows the lid to enclose the first reservoir. 25. The lid of claim 24, wherein said ring forms an air-tight seal between the lid and the first reservoir. 26. The lid of claim 1, wherein said load port includes a removable cover. 27. The lid of claim 26, wherein said cover forms an air-tight seal with said load port. 28. The lid of claim 1, wherein a first flow channel of said plurality of flow channels is formed of a material having a different thermal resistance than a second flow channel of said plurality of flow channels. 29. A lid for a sample holder comprising: a load port disposed on the lid, wherein the load port is configured to receive a volume of fluid; a plurality of flow channels formed within the lid, wherein each said flow channel has a length and a cross-sectional diameter, wherein each said flow channel has a first end connected to said load port and an open second end; wherein said second ends of each said flow channel open into a single reservoir of a plurality of reservoirs in the sample holder when the lid covers the sample holder, and wherein when the volume of fluid is received in the load port, the respective lengths and cross-sectional diameters of the plurality of flow channels are the same or different as required to distribute the volume of fluid received in the load port in approximately equal amounts to each said reservoir of the plurality of reservoirs. 30. The lid of claim 29, wherein at least a first flow channel and a second flow channel of said plurality of flow channels have equal lengths. 31. The lid of claim 30, wherein said load port is disposed at the center of the lid. 32. The lid of claim 29, wherein said load port is configured to interface with a fluid dispensing device. 33. The lid of claim 29, wherein each said flow channel is siliconized. 34. The lid of claim 29, wherein each said flow channel is configured to allow fluid to pass from said first end to said second end of each said flow channel by pressure. 35. The lid of claim 29, wherein each said flow channel is configured to allow fluid to pass from said first end to said second end of each said flow channel by capillary action. 36. The lid of claim 29, wherein each said flow channel is configured to allow fluid to passively flow from said first end to said second end of each said flow channel. 37. The lid of claim 29, wherein a first flow channel of said plurality of flow channels includes at least one curved segment. 38. The lid of claim 29, wherein a first flow channel of said plurality of flow channels includes at least one straight segment. 39. The lid of claim 29, wherein the second end of a first flow channel of said plurality of flow channels ends in a beveled tip. 40. The lid of claim 29, wherein the second end of a first flow channel of said plurality of flow channels is positioned at a distance from a surface of a first reservoir of said plurality of reservoirs when the lid covers the sample holder, and wherein said distance allows fluid from said second end to contact the surface to draw the fluid from said second end by surface tension. 41. The lid of claim 40, wherein said distance is about 0.5 mm. 42. A method of distributing a volume of fluid into a plurality of reservoirs of a sample holder comprising: positioning a fluid-dispensing device with respect to a load port formed on a lid, wherein the load port is configured to receive a volume of liquid and wherein said lid includes a plurality of flow channels, each said flow channel having a first end connected to said load port and an open second end, wherein each said flow channel has a length and a cross-sectional diameter, and introducing the volume of fluid into said load port with said fluid-dispensing device, wherein the respective lengths and cross-sectional diameters of the plurality of flow channels are the same or different as required to distribute the volume of fluid received in the load port in approximately equal amounts to each reservoir of the plurality of reservoirs. 43. The method of claim 42, wherein the fluid-dispensing device is a syringe. 44. The method of claim 42, wherein the fluid-dispensing device is a pipette. 45. The method of claim 42, wherein said positioning further comprises engaging said fluid-dispensing device with a threaded locking mechanism in said load port. 46. The method of claim 42, wherein at least a first flow channel and a second flow channel of said plurality of flow channels have equal lengths. 47. The method of claim 42, wherein said load port is disposed at the center of the lid. 48. A lid for a sample holder, the sample holder having a plurality of reservoirs, the lid comprising: a load port configured to receive a volume of fluid; and a plurality of flow channels; wherein the lid is in fluid communication from the load port to the respective reservoirs via the respective flow channels; wherein the flow channels have (i) approximately equal lengths and approximately equal cross-sectional diameters, or (ii) differing lengths of correspondingly varying cross-sectional diameters such that the volume of fluid distributed to each reservoir is approximately equal; and wherein the second ends of the respective flow channels are positioned such that a droplet emanating therefrom contacts a side of the respective reservoirs. 49. The lid of claim 48, wherein at least one flow channel has a cross-sectional diameter that differs from that of the other flow channels. 50. The lid of claim 48, wherein the plurality of flow channels each have an approximately equal length and approximately equal cross-sectional diameter. 51. The lid of claim 48, wherein the plurality of flow channels includes at least one flow channel that, relative to one other flow channel, has a differing length and a correspondingly varying cross-sectional diameter.