A patient population of cells in a tissue sample is treated with a solution containing radioactive gallium to allow the gallium to be absorbed by the cells. The cells are examined to determine amounts of radioactive material absorbed by the cells by passage of the solution through a cell counter and scintillation counter. Outputs of the counters are correlated to produce signals indicative of the gallium absorption of each cell. The amount of gallium absorption by a cell is a function of maligna...

A circuit for detecting a physical quantity has a detecting circuit including at least one semiconductor sensitive element, two input terminals and two output terminals, said semiconductor sensitive element has a resistivity which is variable in proportion to a physical quantity to be applied thereto, first power supply means connected to said two input terminals of said detecting circuit for applying a voltage thereacross, transistor means having an emitter, a base and a collector connected to ...

This is a system for the protection of personnel in an enclosed space. It comprises a danger detecting system such as a thermally operated electronic controller covering the area under protection, a distinctive audible alarm system which produces a recognizable sound or sound pattern audible throughout the area or enclosure to be protected, and visual directing means indicating the location of one or more exits and/or the direction in which a suitable exit lies. This visual directing system empl...

A method and system for detecting extremely low concentrations of polynitro vapors such as tri-nitrotoluene (TNT) or nitroglycerine (NG) in which an air sample under investigation is introduced into a reaction chamber and mixed with a negatively ionized gas in the reaction chamber to transfer electrons to NG and TNT molecules in the air sample. A drift field is applied to the mixture in the reaction chamber to transport negative ions therein in a desired direction out of the reaction chamber. Th...

A circuit for detecting a physical quantity which comprises a bridge circuit including four sensitive elements having a resistivity which is variable in proportion to a physical quantity to be applied thereto. A power supply is connected to two input terminals of the bridge circuit for applying a voltage thereacross, and a variable resistor comprising a resistor having a predetermined resistance and an adjustable tap is provided for nulling the bridge. The circuit is arranged such that the zero ...

1. An acoustic barrier for detecting and classifying a body intruding into a protected volume of water comprising a high resolution active sonar apparatus including a transmitting transducer submerged in the protected volume of water and having a vertically oriented fan shape directivity pattern with its principal axis slanted toward a bounding surface, means for rotating said transmitting transducer in azimuth about a vertical axis, means for pulsing said transmitting transducer t times per sec...

The presence or absence of living microorganisms is determined by treating a sample containing said microorganisms with an adenosine triphosphate reactive mixture containing luciferin, luciferase and a cation in the presence of oxygen and measuring the light emission produced.

A sample of material such as blood, urine, spinal fluid, or the like to be tested for the presence of biological activity is placed into a sterile container together with a suitable growth medium which includes a C.sup.14 carbon containing carbon source (such as C.sup.14 substituted glucose) which is fermentable to produce gaseous C.sup.14 O.sub.2. An incubator is provided for exposing the container and its contents to conditions conducive to growth. After a suitable incubation period, a portion...

A photoelectric focus detecting member includes a semiconductor substrate of a first polarity and at least two closely transversely spaced parallel longitudinally extending photosensitive laminae of a polarity opposite to the first polarity to form corresponding photodiodes. Each of the photosensitive laminae is masked to provide regularly spaced light receiving areas alternating with masked areas, the light receiving areas of successive transversely spaced photodiodes being relatively longitudi...

A method and apparatus for determining the position of and estimating the size of leaks in an evacuating apparatus comprising the use of a testing gas such as helium or hydrogen flowing around said apparatus whereby the testing gas will be drawn in at the site of any leaks.