Stoichiometrically imbalanced solutions of 6FTA and aromatic diamine can be used to prepare laminates and bonded articles having a broad temperature range for consolidation.

A composition, test device, method of making a test device and process for determination of an analyte in a liquid sample are disclosed. More particularly, there is provided a composition for detecting an analyte in a liquid sample comprising an analyte-responsive component and an indicator composition having a plurality of components comprising at least one nonresponsive precursor component and at least one component effective in a liquid milieu to alter said precursor component so as to releas...

The precursor composition of silicon carbide fibers provided by the invention has greatly improved spinnability and can be spun at a very high spinning velocity to give a green filament which has a much larger tensile strength than those of conventional precursor materials and is capable of giving silicon carbide fibers having increased tensile strength by the infusibilization and calcination of the green filament of the composition under tension. The composition comprises from 80 to 99.9 parts ...

Nucleic acids may be labeled by intercalating the alkylating intercalation moiety of a labeling reagent into a partially double-stranded nucleic acid to form a complex and activating the complex to cause covalent bonding between the reagent and the nucleic acid. Preferably, the labeled nucleic acid is a hybridization probe for detecting nucleic acid sequences capable of hybridizing with a hybridizing region of the nucleic acid. Also preferably the label moiety is non-radioactive. The labeling re...

A synthesis method is provided for the synthesis of quinone compounds of the formula ##STR1## where n is 0-3, Y.sup.1 is alkoxy, Y.sup.2 is alkoxy, chloro, bromo or hydrogen and R' and R" each and independently are hydrogen, alkyl or phenyl. These compounds are useful as reductant precursors in tellurium imaging compositions.

Described herein is a process for the preparation of a novel essentially nonaqueous glutaraldehyde precursor which is capable of rapidly generating glutaraldehyde upon addition to water. The precursor is prepared by the hydration of 2-alkoxy-3, 4-dihydropyran in the presence of an acid catalyst.

Urea-formaldehyde precursors are produced in a two-stage process. In the first stage, urea is slowly added to an acidic solution of formaldehyde at a pH of 1.0 or less, at a rate that maintains the temperature at 50.degree. C. but not in excess of 98.degree. C. When an F/U mole ratio of 3.25:1 to 2.5:1 has been attained, the pH is adjusted to the basic side, generally from about 7.2 to about 8.0. In the second stage, additional urea is added to the condensate produced in the first stage, to atta...

A process for producing a polyimide precursor having excellent adhesion property and improved moisture resistance by polymerization of an organic tetracarboxylic acid component and a diamine is disclosed. A portion of the organic tetracarboxylic acid is reacted with an aminosilane compound in which H in an amino group is substituted with a monovalent organic group containing a hydrophobic aromatic ring, to produce a silane-modified polycarboxylic acid component and the resulting silane-modified ...

Novel volatile barium complexes are disclosed which are very stable and evaporate cleanly at elevated temperatures. Such complexes are highly suited for use as a barium source in OMCVD processes.

A proinsulin-like disulfide insulin precursor is produced from its corresponding linear chain S-sulfonate insulin precursor by reacting the S-sulfonate with a mercaptan in an amount which provides from about 1 to about 5 --SH moieties per --SSO.sub.3.sup.- moiety in an aqueous medium at a pH of from about 7 to about 11.5 and at an S-sulfonate concentration of up to about 10 mg. per ml. of aqueous medium.