Abstract: A method of and means for controlling orientation of particles through a sensing zone in a particle analyzing system, which facilitates particle shape determination, comprises laminar flow orientation of the particles in a stream moving through an elongate straight passage coaxially aligned with an elongate sensing zone longer than the longest particle to be sensed and analyzed. The particles are carried through the sensing zone in an isokinetic laminar flow sheath of fluid.

Abstract: A method of and means for controlling orientation of particles through a sensing zone in a particle analyzing system, which facilitates particle shape determination, comprises laminar flow orientation of the particles in a stream moving through an elongate straight passage coaxially aligned with an elongate sensing zone longer than the longest particle to be sensed and analyzed. The particles are carried through the sensing zone in an isokinetic laminar flow sheath of fluid.

Abstract: The achievement of conception and the sex of the resulting human baby depends upon, or is influenced by, the time of impregnation with respect to the time of ovulation. Predetermination of prospective ovulation time enhances success since impregnation should precede ovulation because sperm remains viable longer than the egg. On the basis of the discovery that vaginal fluid contains ATP not only in women but also in a class of mammals, e.g., cows, and that the concentration varies in repeated patterns in successive ovulation cycles, the time of ovulation is predicted by measurement of ATP concentration. This is done quantitatively and reliably by measuring the intensity of light resulting from the reaction of ATP with luciferase/luciferin. A suitable buffer effects protraction of light for accurate reading with a simple meter.