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System and process for isolating purified biological materials with a collecting unit which has collecting vessels that are accessible from above with a matrix unit in which matrix vessels are arranged in a holder as well as a closure unit which can be placed on the collecting unit to close the coll

System and process for isolating purified biological materials with a collecting unit which has collecting vessels that are accessible from above with a matrix unit in which matrix vessels are arranged in a holder as well as a closure unit which can be placed on the collecting unit to close the collecting vessel. In addition the invention also concerns a system having a collecting unit, a matrix unit, and a closure unit as well as a lysis unit and a waste unit. Moreover a new closure arrangement is disclosed which is suitable for closing vessels in which there is excess pressure.

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System and process for isolating purified biological materials with a collecting unit which has collecting vessels that are accessible from above with a matrix unit in which matrix vessels are arranged in a holder as well as a closure unit which can be placed on the collecting unit to close the coll

System and process for isolating purified biological materials with a collecting unit which has collecting vessels that are accessible from above with a matrix unit in which matrix vessels are arranged in a holder as well as a closure unit which can be placed on the collecting unit to close the collecting vessel. In addition the invention also concerns a system having a collecting unit, a matrix unit, and a closure unit as well as a lysis unit and a waste unit. Moreover a new closure arrangement is disclosed which is suitable for closing vessels in which there is excess pressure. l and chrome oxide with at least one further metal oxide, wherein the metal in the metal oxide has a substantially smaller neutron absorption cross section than Cr, wherein the amount of the at least one further metal oxide added noticeably contributes to a grain enlarging effect of chrome oxide on the nuclear fuel during sintering; and sintering the mixed oxide-based fuel, the further metal oxide and the chrome oxide to form a solid body. 2. The method according to claim 1, wherein the further metal oxide comprises aluminium oxide. 3. The method according to claim 2, wherein the aluminum oxide comprises Al2O3,and wherein the amount of Al is ≥20 ppm with respect to the amount of oxide-based fuel. 4. The method according to claim 2, wherein the aluminum oxide comprises Al2O3,and wherein the amount of Al is ≤300 ppm with respect to the amount of oxide-based fuel. 5. The method according to claim 1, wherein the further metal oxide comprises magnesium oxide. 6. The method according to claim 5, wherein the magnesium oxide comprises MgO and wherein the amount of Mg added is ≥20 ppm. 7. The method according to claim 5, wherein the magnesium oxide comprises MgO and wherein the amount of Mg added is ≤300 ppm. 8. The method according to claim 1, wherein the sintering is carried out at a temperature at which the chrome oxide and the further metal oxide form a liquid phase which after the sintering forms a matrix between particles of the oxide-based nuclear fuel. 9. The method according to claim 1, wherein the oxide-based nuclear fuel comprises at least one of the oxides UO2,ThO2and PuO2. 10. An oxide-based material adapted to be sintered to a nuclear fuel element, comprising: an oxide-based nuclear fuel; chrome oxide in the form of Cr2O3wherein the amount of Cr is between ≥50 ppm and ≤1000 ppm with respect to the amount of the oxide-based nuclear fuel; and at least one further metal oxide comprising a metal having a substantially smaller neutron absorption cross section than Cr and being present in such an amount that it contributes noticeably to a grain enlarging effect of chrome oxide upon the oxide-based nuclear fuel at the sintering of the material. 11. The material according to claim 10, wherein the further metal oxide comprises aluminium oxide. 12. The material according to claim 11, wherein the aluminum oxide comprises Al2O3,and wherein the amount of Al is ≥20 ppm with respect to the amount of oxide-based fuel. 13. The material according to claim 11, wherein the aluminum oxide comprises Al2O3,and wherein the amount of Al is ≤300 ppm with respect to the amount of oxide-based fuel. 14. The material according to claim 10, wherein the further metal oxide comprises magnesium oxide. 15. The material according to claim 14, wherein the magnesium oxide comprises MgO and wherein the amount of Mg added is ≥20 ppm. 16. The material according to claim 14, wherein the magnesium oxide comprises MgO and wherein the amount of Mg added is ≤300 ppm. 17. The material according to claim 10, wherein the oxide-based nuclear fuel comprises at least one of the oxides UO2,ThO2and PuO2.