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A microtitration plate including a plastic base having a multiplicity of cups shaped and sized to receive biological liquid samples, each cup being surrounded by an attenuated zone and having an upper collar sized and shaped to cooperate with a complementary sized and shaped tool to exert a torsiona

A microtitration plate including a plastic base having a multiplicity of cups shaped and sized to receive biological liquid samples, each cup being surrounded by an attenuated zone and having an upper collar sized and shaped to cooperate with a complementary sized and shaped tool to exert a torsional force on the upper collar, thereby causing detachment of the cup by tearing at least a portion of the attenuated zone.

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1. A microtitration plate comprising a plastic base having a multiplicity of cups shaped and sized to receive biological liquid samples, each cup being connected to the plate and surrounded by an attenuated zone and having an upper collar sized and shaped to receive a torsional force, thereby causin

1. A microtitration plate comprising a plastic base having a multiplicity of cups shaped and sized to receive biological liquid samples, each cup being connected to the plate and surrounded by an attenuated zone and having an upper collar sized and shaped to receive a torsional force, thereby causing detachment of said cup from the plate by tearing at least a portion of said attenuated zone. 2. The plate according to claim 1, wherein the collar is serrated and has alternating notches and protruding projections. 3. The plate according to claim 1, wherein each cup is surrounded by an attenuated zone having spaced apart radial extensions that extend from the cup and form grooves with widths substantially equal to at least the width of the radial extensions. 4. The plate according to claim 3, wherein the collars are surrounded by a tear zone having semicircular shoulders that form an inclined plane on which the radial extensions slide upon their separation from the base by rotational movement. 5. The plate according to claim 1, wherein the cups have individual identification labels. 6. The plate according to claim 1, wherein the base has an individual identification label. 7. The plate according to claim 5, wherein the identification labels are bar codes embedded in the plastic. 8. The plate according to claim 6, wherein the identification labels are bar codes embedded in the plastic. 9. The plate according to claim 5, wherein the identification labels are radio-frequency or coded magnetic labels and embedded in the plastic. 10. The plate according to claim 6, wherein the identification labels are radio-frequency or coded magnetic labels and embedded in the plastic. 11. The plate according to claim 1, further comprising tamper evident film fixed on the base and each cup. 12. The plate according to claim 1, wherein the base has a slot for introduction of a strip bearing a remote identification label. 13. The plate according to claim 12, wherein the strip has at least one lock. 14. The plate according to claim 1, further comprising covers that fit on at least a part of the cups to seal said cups. 15. A microtitration plate comprising: a base member having a substantially flat surface and containing a plurality of openings; a cup positioned within each opening and fixed to the base portion with a tearable portion that permits detachment of the cup from the base member by severing the tearable portion upon application of torque force; and an upper collar for each cup sized and shaped to receive said torque force.