摘要:
Quinone methide derivatives such as 4-benzylidene-2,6-di-tert-butyl-cyclohexa-2,5 dienone are used to inhibit styrene monomer polymerization in the dehydrogenator portion of a styrene monomer production system. The inhibitor contacts the dehydrogenation effluent and does not partition in substantial amounts to the aqueous phase that is separated in the phase separator.
摘要:
The present invention is directed to compounds that are inhibitors of cysteine proteases, in particular, cathepsins B, K, L, F, and S and are therefore useful in treating diseases mediated by these proteases. The present invention is also directed to pharmaceutical compositions comprising these compounds and processes for preparing them. The present invention is also directed to the use of these inhibitors in combination with a therapy that causes a deleterious immune response in patients receiving the therapy.
摘要:
The present invention is directed to a novel process for preparing heteroaryl and unsaturated heterocycloalkylmagnesium reagents that are useful in the synthesis of a variety of pharmaceuticals, in particular certain cysteine protease inhibitors.
摘要:
Devices and methods for isolating nucleic acid is disclosed herein. In particular, the isolation of total cellular RNA is discussed. Additionally, devices and methods for reducing genomic DNA in a biological sample without introducing harmful contaminants, and without significantly increasing the time required for the overall procedure being performed on a sample are presented.
摘要:
Sour sulfhydryl-group containing oils are treated with an amount of hexamethylenetetramine effective to sweeten the oil and reduce headspace H.sub.2 S to a desired level.
摘要:
Antimony tricarboxylates of higher carboxylic acids can be prepared by(a) reacting antimony oxide with an anhydride of a lower organic acid,(b) reacting the product from (a) with at least one higher carboxylic acid at a temperature sufficient to vaporize volatile material and removing said volatile material, and(c) recovering the antimony tricarboxylate of said higher carboxylic acid.
摘要:
Methods and compositions are provided for inhibiting the polymerization of a vinyl aromatic monomer, such as styrene monomer, during elevated temperature processing or distillation thereof. The compositions comprise an inhibitor combination of (A) a hydroxylamine and (B) a stable free radical plus a retarder that is either; (C) dinitrobutylphenol or (D) quinone methide. The ratio of (A) to (B) ranges from about 5% (A) to 95% (B) to about 95% (A) to about 5% (B). The compositions are added to the vinyl aromatic monomer in amounts sufficient to prevent polymerization during the distillation process. Typically the inhibitor combination is added to the vinyl aromatic monomer in an amount ranging from about 10 to 150 ppm of the monomer. Retarders are typically added in an amount ranging from 50 to 1500 ppm of the vinyl aromatic monomer.
摘要:
A toothbrush for enhancing the whiteness of teeth while carrying out normal prophylactic brushing with a material that includes a light/heat activated whitening agent. The whitening agent is usually activated by light of a certain wavelength. The toothbrush comprises a handle and a head and optical transmission material bringing light of a predetermined frequency to the head portion. The head portion has a clear surface into which the bristles are secured so as to cause light to shine on the teeth surfaces as they are being brushed by the bristles.
摘要:
The present invention is directed to compounds that are antiviral agents. Specifically the compounds of the present invention inhibit replication of HCV and are therefore useful in treating hepatitis C infections. The present invention is also directed to pharmaceutical compositions comprising these compounds and processes for preparing them.