Abstract: An artificial mixture which simulates human feces and its method of use for fecal occult blood testing as a control material or for proficiency testing are disclosed.

Abstract: A testing kit and method for determining the day of ovulation in a woman who has menstruated having a plurality of test assemblies each with an upper chamber, a lower chamber in fluid communication with the upper chamber separated from the upper chamber by a screen member, a saliva-absorbable chewable plug which when chewed by the user can be compressed against the screen member to express saliva into the lower chamber which contains a reagent which produces a color change, the intensity of which is proportional to the concentration of glucose in the saliva wherein a plurality of such test assemblies are utilized one on each of successive days for determination of the peak color intensity on the day that the saliva has the greatest concentration of glucose to allow for computation from this peak day of the date of ovulation of the woman.

Abstract: A process for removing finer than uniform size particles from a powder in a container including the steps of suspending the finer particles in a liquid rinse containing a charged compound such as a quanternary ammonium compound to reduce the static attraction of the finer particles from being bound to larger particles allowing the large particles to settle and decanting the suspensed finer particles in the liquid.

Abstract: A device and method for determining characteristics of a fluid sample using optical measurements and changing the optical density range of a sample, e.g., for the second of two required measurements.

Abstract: A test device for determining a characteristic of a sample, particularly for determining substances in fluid samples. The device comprises a strip element which is composed of a material capable of transporting a developing fluid therealong by capillarity and which has a portion at a predetermined location on the strip element for receiving the test sample and portions at predetermined locations on the strip element incorporated with reagent means for providing a detectable response sensitive to the characteristic under determination. The beginning end portion of the strip element is immersed in the developing fluid which, as a result, traverses the length on the strip element, thereby promoting appropriate contact between the test sample and the reagent means resulting in the disposition of a detectable response at a predetermined location on the strip element, which response is a function of the characteristic under determination.

Abstract: Test device for determining a characteristic of a sample, particularly for determining substances in fluid samples. The device comprises a strip element which is composed of a material capable of transporting a developing fluid therealong by capillarity and which has a portion at a predetermined location on the strip element for receiving the test sample and portions at predetermined locations on the strip element incorporated with reagent means for providing a detectable response sensitive to the characteristic under determination. The beginning end portion of the strip element is immersed in the developing fluid which, as a result, traverses the length of the strip element, thereby promoting appropriate contact between the test sample and the reagent means resulting in the disposition of a detectable response at a predetermined location on the strip element, which response is a function of the characteristic under determination.

Abstract: Test device for determining a characteristic of a sample, particularly for determining substances in fluid samples. The device comprises a strip element which is composed of a material capable of transporting a developing fluid therealong by capillarity and which has a portion at a predetermined location on the strip element for receiving the test sample and portions at predetermined locations on the strip element incorporated with reagent means for providing a detectable response sensitive to the characteristic under determination. The beginning end portion of the strip element is immersed in the developing fluid which, as a result, traverses the length of the strip element, thereby promoting appropriate contact between the test sample and the reagent means resulting in the disposition of a detectable response at a predetermined location on the strip element, which response is a function of the characteristic under determination.