Abstract:
The present invention relates to the direct quantitative determination of cholesterol and involves the formation of a spectrophotometrically active product of cholesterol obtained by contacting cholesterol with an acyl compound and a perchlorate effective to form the spectrophotometrically active product.
Abstract:
Group II-VI compound semiconductor light emitting devices which include at least one II-VI quantum well region of a well layer disposed between first and second barrier layers is disclosed. The quantun well region is sandwiched between first and second cladding layers of a II-VI semiconductor material. The first cladding layer is formed on and lattice matched to the first barrier layer and to a substrate of a III-V compound semiconductor material. The second cladding layer is lattice matched to the second barrier layer. The quantum well layer comprises a II-VI compound semiconductor material having the formula AxB(1-x)C wherein A and B are two different elements from Group II and C is at least one element from Group VI. When the second cladding layer has a p-type conductivity, a greaded bandgap ohmic contact according to the present invention can be utilized. The graded bandgap contact can be a single continuously graded II-VI p-type region or a plurality of cells with each of the cells having first and second thin layers of first and second p-type II-VI semiconductor materials respectively. Another embodiment of the present invention discloses a monolithic multicolor light emitting element capable of emitting four colors and a method for fabricating same. The monolithic multicolor element includes four II-VI semiconductor light emitting devices formed on a single III-V substrate.
Abstract:
Disclosed are polymers comprising phenyl rings pendant from the polymer chains or incorporated therein, wherein the phenyl rings are substituted with aldehyde and/or carboxylic acid functionalities and/or derivatives thereof. Also disclosed is a catalytic oxidation process for producing such polymers from precursor polymers containing benzylic carbon atoms.
Abstract:
The present invention provides a method for making R stereospecific alkyl- and aryl-phosphonate linkages between nucleotides. These methods can be used for automated synthesis of oligonucleotides having sequential R stereospecific alkyl- and aryl-phosphonate linkages. The present invention is also directed to the oligonucleotides having several sequential R phosphonate linkages which were produced by the subject methods. Moreover, the present invention provides methods for using the subject oligonucleotides, including methods for regulating the biosynthesis of a DNA, an RNA or a protein and methods for detecting and isolating complementary nucleic acid targets.
Abstract:
A high performance chiral selector having formula (I) whereinAr is a monocyclic or ortho-fused polycyclic aromatic moiety having up to 10 ring carbon atoms, either of which may be unsubstituted or substituted with one or more C1 to C6 alkyl, C1 to C6 alkoxy, NO2, N(R5)3, CN, COOR6, SO3H and COR7 groups wherein R5, R6 and R7 are each independently hydrogen or C1 to C6 alkyl; R1 and R2 are each independently hydrogen, C1 to C6 alkyl or phenyl; R3 and R4 are each independently C1 to C12 alkyl or C2 to C12 alkenyl; and m and n are each independently zero or 1, said compound being an R or an S enantiomer or a mixture of R and S enantiomers.
Abstract:
The present invention relates to stilbene derivatives which possess utility as anti-cancer agents. The compounds can be used to treat cancers which are susceptible to treatment therewith, and can be utilized in a method of treating such cancers. Pharmaceutical compositions containing the compounds are disclosed. Three preferred compounds amont those disclosed are (Z)-1-(4-methoxyphenyl)-2-(3,4,5-trimethoxyphenyl)ethene, (Z)-1-(4-methylphenyl)-2-(3,4,5-trimethoxyphenyl)ethene, and 4-methyl-3',4',5'-trimethoxybenzylaniline hydrochloride.
Abstract:
The present invention provides compounds which are covalent conjugates of deferoxamine and biotin or derivatives thereof. The subject compounds are capable of binding metal ions and avidin or streptavidin, and accordingly are useful in two-step radioimmunoimaging and radioimmunotherapy. Methods for the synthesis of the deferoxamine-biotin conjugates are also provided by the present invention.
Abstract:
The present invention relates to promoter elements from human type I transglutaminase (TGase I) genes for controlled gene expression of both human TGase I and heterologous proteins. These promoter elements permit tissue-specific expression of genes, e.g. for use in human gene therapy and for testing pharmaceutical agents with artificial skin. Additionally, the subject promoter elements can provide differential regulation under physiological conditions or in the presence of exogenously added factors including calcium and retinoic acid.
Abstract:
A method for alleviating and diagnosing syndromes of heart block wherein a stimulus is continuously or intermittently delivered via a single electrode catheter at a site in a heart in close proximity to the A-V junction in the heart. The subthreshold stimuli were sufficient to cause impulses in the atrium to pass through the damaged his bundle to the ventricle and the stimuli were set at a level below a level required to excite the heart tissue. The delivery of the stimuli alleviates the symptoms of heart block. In one application, the delivery of the stimuli is used for diagnosing heart block when delivery of the stimuli induces the symptoms of heart block in the patient with partial or covert conduction disease.
Abstract:
Gene therapy involves the transfer and stable insertion of new genetic information into cells. The present invention is directed to safe vectors for gene therapy and thus provides hybrid parvovirus vectors which are capable of site-specific integration into a mammalian chromosome without substantial cytotoxicity, and which direct erythroid cell-specific expression of heterologous genes. The hybrid vector is useful in gene therapy, particularly in the treatment of hemoglobinopathies and other hematopoietic diseases, and in conferring cell-specific multidrug resistance. A method of delivery of constitutive levels of a pharmaceutical product and a method of producing a recombinant protein are also provided.