Abstract: A logic circuit has the first electron transmission protein film made of the first electron transmission protein, the second electron transmission protein made of the second electron transmission protein having a redox potential different from that of the first electron transmission protein and glued on top of the first electron transmission film, the third electron transmission protein made of the third electron transmission protein having a redox potential different from that of the second electron transmission protein and glued on top of the second electron transmission protein film, an electrode connected to the first electron transmission protein film, an electrode having an electrical influence on the second electron transmission protein film, and an electrode connected to the third electron transmission protein film to form transistors making use of differences in redox potential among the respective electron transmission proteins for performing a logical operation for a plurality of inputs.

Abstract: A method for detecting the presence of carboxylic acids in a specimen is provided. A specimen is contacted with a developing system containing a metal salt reactive with carboxylic acids present in the specimen to form metal-carboxylic acid complexes. Any such complexes are colorimetrically detected by their activity in catalyzing oxidation of a chromogen such as guaiac. The method is useful in detecting intestinal helminth infestation.

Abstract: A device for treating water to reduce the concentration of cations or anions therein includes a water-tight container (4) of flexible material, designed to be able to lie substantially flat (FIG. 3) when empty and having an aperture (5) for the introduction of liquid, a strainer (7) extending across the aperture, and a closure (6) for the aperture, and a quantity of ion-exchange material (b 8) occupying a minor proportion of the available interior volume of the container. A soil extraction outfit and a soil testing outfit are described, which incorporate the water treatment device.

Abstract: A method of quantitatively analyzing nitrogen contained in titanium group metal or an alloy thereof, involving melting the metal or alloy in an inert gas atmosphere, allowing the nitrogen in titanium to be extracted and subjecting the extracted nitrogen to a quantitative analysis, characterized in that a titanium sample for analysis is melted in the present of nickel in an amount corresponding to 7 to 16 times the weight of the sample.

Abstract: An apparatus for use in the measurement of total iron binding capacity of blood serum or plasma comprises a container having a removable closure and containing a measured quantity of dried iron-saturating substance, which is adhered to the inner surface of the container or of the closure and a measured quantity of dried alumina. The invention further provides a simple, rapid and inexpensive method for measurement of total iron binding capacity using the apparatus.

Abstract: Devices and methods are provided for making a plurality of determinations of the local (site-specific) redox state of a liquid system, by employing a photoresponsive element, which can be independently irradiated at different sites to provide independently detectable signals.

Abstract: A colorimetric reagent formulation is disclosed for the determination of the ferric iron content of serum. The formulation consists of two aqueous solutions. One solution, acting as chromogenic reagent, consists of a buffer, a soluble salt of an alkali or alkaline earth metal, chromazurol S in acidic form, and either a cationic or nonionic surfactant. The other solution, acting as masking reagent, consists of a complexing agent and if desired the same components of the chromogenic reagent, which are able to prevent the formation of the complex between the chromazurol S, the surfactant and the iron. The complexing agent consists of a polycarboxylic organic acid or salt thereof.

Abstract: A method of quantitatively analyzing oxygen or nitrogen contained in titanium group metal or an alloy thereof, involving melting the metal or alloy in an inert gas atmosphere, allowing the oxygen in titanium to react with carbon thereby extracting it as carbon monoxide, or allowing the nitrogen in titanium to be extracted, and subjecting the extracted carbon monoxide or nitrogen to a quantitative analysis, characterized in that a titanium sample for analysis is melted in the present of nickel in an amount corresponding to 7 to 17 times the weight of the sample.

Abstract: An improved process for quantitatively determining nitrogen content or other elemental content in a wide variety of materials. The process avoids the use of conventional catalysts, is simpler and faster than previous techniques, and results in a very high degree of accuracy. The process involves the use of a hydrogen peroxide which is added to the digest continuously, while the digest is boiling, while refluxing with a fractionating column. The digestion process also enables quantitative determination of various elements other than nitrogen.

Abstract: Unsaturated iron-binding capacity in serum can be measured colorimetrically rapidly and easily by using an auto analyzer and using a reagent mixture comprising excess iron ions, a reducing agent for iron ions, and a hydroxy acid and/or a salt of a hydroxy acid together with a color-forming reagent solution.

Abstract: A method for determining the iron-binding capability of transferrin, consisting in adding to the sample being tested a reagent composed of a solution of a ferric salt adsorbed onto a suspension of magnesium carbonate, centrifuging the mixture so obtained and measuring the iron blocked by transferrin in the supernatant. The method is preferably carried out by utilizing a particular composition consisting of a single reagent composed of a suspension of a solution of a ferric salt absorbed on magnesium carbonate, possibly a medium capable of maintaining the pH between 8 and 9, if desired, a colorimetric reagent for the determination of iron.

Abstract: A method for determining the coating weight and composition of a zinc phosphate coating on a ferrous metal surface comprises stripping the coating from a known area using an aqueous solution of sodium hydroxide and triethanolamine, thereafter measuring the iron and phosphate contents by colorimetric analysis of the stripping solution and then determining the coating weight and composition based on such measurements.

Abstract: An improved field-test method and apparatus for the detection of asbestos by detecting magnesium or iron is described wherein all of the reactions of the test are performed in one reaction tube or column. The method includes the steps of placing a sample in the tube, washing the sample in the tube, adding acid reagent to the sample, and adding a color reagent to the sample in the tube to indicate qualitatively if asbestos is present in the sample. The apparatus is in the form of a compact kit containing multiple columns with caps and other labware needed for the test.

Abstract: Therapeutic and diagnostic methods employing metal chelate conjugated monoclonal antibodies are described. Metals employed in therapeutic conjugated antibodies include alpha particle, beta particle or Auger electron emitting isotopes. Diagnostic methods may be either in vivo or in vitro. Chelated metals employed in diagnostic techniques may include, inter alia, gamma or positron emitting metals as well as fluorogenic or paramagnetic metals.

Abstract: The presence of volatile metal carbonyls, e.g., nickel tetracarbonyl and iron pentacarbonyl, in fluid streams can be measured simultaneously by a gas chromatograph using squalane as the stationary liquid phase and a constant current, electron capture detector.

Abstract: An improved colorimetric reagent is disclosed, which is adapted to the determination of the iron content in blood serum. The formulation comprises only two aqueous solutions: one of these comprises a buffer, a soluble salt of an alkali metal or an alkaline earth metal, Chromazurol B, a cationic or nonionic surfactant, whereas the other solution comprises a complexing agent and possibly the same ingredients of the chromogenic reagent for hindering the formation of the disturbing complex between chromazurol B, the surfactant and the iron: the complexing agent is a polycarboxylic acid or a salt thereof.

Abstract: N-sulfoalkylaniline derivatives in which at least one sulfoalkyl of 2 to 4 carbon atoms is attached to the nitrogen atom which are useful as dyestuff forming substances, a composition for determining the presence of peroxides using such compounds and the process for determination of peroxides using such compounds.

Abstract: An extractant system comprising (a) a high molecular weight alkylaromatic sulfonic acid and (b) a chelating amine having a pKa of from about 3 to about 9 in a solvent which is essentially immiscible with water, said system being useful for the selective extraction of desired metals, e.g., cobalt, nickel or copper ions from aqueous acidic ore leach liquors.

Abstract: Colorimetric analysis for the presence or concentration of hexacyanoferrates in an aqueous liquid is carried out by forming a colored indicator compound which is soluble therein. The analysis is based on the use of a cobaltic complex of tris-1,10-phenanthroline or tris-2,2'-bipyridyl as an analytical reagent.