Thermal convection counter streaming sedimentation method for co

Drug – bio-affecting and body treating compositions – Fermentate of unknown chemical structure – Having a known elemental analysis

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A61K 3552

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040679659

ABSTRACT:
A method and apparatus for controlling the sex of mammalian offspring through separation of X-chromosome female producing sperm and Y-chromosome male producing sperm. The separation is accomplished by producing a thermal convection counter stream within a sedimentation column containing a universal medium with sperm suspended therein, and subsequently allowing the two sperm populations to sediment into different fractions according to different densities. The positive and negative geotaxis thus applied to the sperm facilitate a more efficient separation than has been previously obtained. The apparatus used to accomplish this separation includes means for producing a temperature differential between axial and peripheral portions of the medium contained in the sedimentation column thus creating the necessary thermal convection counter stream, and may also comprise a laser capable of scanning the length of the column and laser detecting means to determine the distribution of sperm produced within the medium.

REFERENCES:
patent: 3816249 (1974-06-01), Bhattacha rya
patent: 3894529 (1975-07-01), Shrimpton
Schilling, "Experiments in Sedimentation and Centrifugation of Bull Spermatozoa and the Sex Ratio of Born Calves", J. Reprod. Fert., (1966), 11, 469-472.

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