A diagnostic test is provided based on competitive binding in which a partition coefficient is established for the substance whose concentration is to be determined and for the radioactive labeled form of the substance between liquid and solid phases.

A reagent for the determination of globulin in serum comprising a solution of ethyl acetate, acetic acid, a ferric salt, sulfuric acid and water. Methods for its preparation and use are disclosed.

An electrical testing pin characterized by a crown with an inner contact area and a plurality of outer contact areas, the former extending longitudinally beyond the latter.

Yarn testing device comprising a spool, a variably driven godet with one yarn coil, followed by a suction nozzle, and a yarn tensioner to switch on and off, located between the spool and the godet, the suction nozzle and the pneumatically actuated yarn tensioner being connected with a changeover switch.

An alligator clip for testing electrical circuits is provided with a spring clip on one conductive leg of the alligator clip for slidably receiving a termination on a terminal board for testing the same.

Serum angiotensin converting enzyme is elevated in many patients with sarcoidosis. A method involving formation of the fluorescent adduct of o-phthaldialdehyde and the histidyl moiety of the L-histidyl-L-leucine product formed by the action of angiotensin converting enzyme on hippuryl-L-histidyl-L-leucine substrate is applicable to determining angiotensin converting enzyme in untreated serum for the diagnosis of sarcoidosis. This method is simple, rapid and highly sensitive, and requires as litt...

A simple, sensitive, reliable and safe method and device for detecting pregnancy is disclosed. The test involves concentration by ultrafiltration of a sample of urine or serum from a subject; followed by determining the presence of human chorionic gonadotropin or of its .beta.-subunit in the concentrated sample.

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 t...

An improved method for determining the concentration of arginase in serum. A test sample is treated stepwise with several reagents, including arginine, to produce an ornithine containing solution and the resulting sample is colorimetrically compared against a similar sample absent ornithine. From the resulting measurements an assay for arginase is computed. The improvement in this method lies principally in the elimination of a centrifugation and precipitation step and, also, in the elimination ...

Test apparatus is disclosed for testing a gas-fired forced air heating system having a plurality of control elements. A monitoring device includes an indicator light adjacent to the thermostat for indicating a malfunction in the heating system, the monitoring device including condition-responsive switches for energizing the indicator in response to the absence of a stream of heated air when called for by the thermostat or in response to a malfunction in the thermostat. An analyzer comprises a pl...