Abstract:
Un appareil ameliore permettant de melanger un gaz d'echantillon avec un gaz metastable est utilise dans un systeme d'analyse de constituants d'un echantillon par spectroscopie par emission de transfert metastable. L'appareil presente un passage non obstrue pour l'ecoulement du gaz d'echantillon de maniere a reduire au minimum le depot de l'echantillon (10) sur la paroi de l'appareil. L'appareil peut comprendre un collecteur annulaire (14) monte coaxialement autour d'une conduite (32) au travers de laquelle l'echantillon (10) s'ecoule, ou peut comprendre un collier (34) connecte de maniere detachable en ligne avec cette conduite (32).
Abstract:
Monoclonal antibodies have been developed which specifically bind the PSA-ACT complex without significant cross-reactivity with PSA, ACT or CG-ACT. The antibodies were generated using a unique immunogen comprising a PSA-ACT complex having bound to monoclonal antibodies against PSA and monoclonal antibodies against ACT. It is theorized that the antibodies against PSA and ACT block immunodominant sites on the PSA-ACT complex. The antibodies generated against the unique immunogen specifically bind the PSA-ACT complex, but have no significant cross-reactivity with either PSA or ACT. The monoclonal antibodies of the present invention can be used in immunoassays to specifically detect PSA-ACT in a sample.
Abstract:
A nephelometer and nephelometer/turbidimeter combination of the type useful in automated chemical analyzers is provided. The combination includes a laser for generating a polarized laser beam having an S-wave component and a P-wave component. The beam is split by a beam splitter specially constructed so that a known proportion of one of the two polarized portions of the beam is directed to a reaction container. In the reaction container, a first polarized component of the laser beam is used in a nephelometric chemical analysis. The remainder of the laser beam passes through the beam splitter to a laser control light detector. Before the remainder of the laser beam reaches the laser control light detector, however, the polarized component which is not used in nephelometric chemical analysis is filtered out. The laser control detector uses the non-filtered portion of the laser beam to control the output of the laser. The combination also includes an LED which emits a beam of light at a longer wavelength than that of the laser. Such beam of light is projected through the reaction container to a turbidimeter light detector. A second beam splitter is provided between the reaction container and the turbidimeter light detector to deflect the residual portion of the laser beam away from the laser. This prevents the residual portion of the laser beam from being reflected back into the reaction container.
Abstract:
A non-liquid scatter standard for use in nephelometry and turbidimetry systems which comprises a clear silicon rubber gel in which an effective light scattering amount of inorganic particles are suspended. The particles have an index of refraction greater than that of the silicon rubber gel.
Abstract:
Universal solid support oligonucleotide synthesis reagents, oligonucleotide synthesis processes, and reagents for cleaving oligonucleotides from solid supports are disclosed. Oligonucleotide synthesis reagents have the following general formula: SS - R - O - R wherein SS is a solid support; R is (a), (b) or (c), where R is hydrogen or alkyl and R is a phosphate protecting group; and R is a ring moiety having vicinal groups -XR and -YR wherein each of X and Y is independently selected from the group consisting of O, S and NH and one of R and R is a blocking moiety and the other is hydrogen or a hydroxy protecting group. Oligonucleotide cleaving reagents include methylamine and/or ammonium hydroxide and trimethylamine.
Abstract translation:公开了通用固体支持寡核苷酸合成试剂,寡核苷酸合成方法和用于从固体支持物切割寡核苷酸的试剂。 寡核苷酸合成试剂具有以下通式:SS-R 6 -O-R 3其中SS是固体支持物; R 6是(a),(b)或(c),其中R 5是氢或烷基,R 4是磷酸酯保护基; 并且R 3是具有连位-XR 1和-YR 2的环部分,其中X和Y各自独立地选自O,S和NH以及R 1和 R 2是封端部分,另一个是氢或羟基保护基团。 寡核苷酸切割试剂包括甲胺和/或氢氧化铵和三甲胺。
Abstract:
A system for simultaneously conducting multiple ligand assays on a sample potentially containing target analytes uses as a detector a waveguide having thereon a plurality of probes of known recognition to the target analytes. The probes are in discrete areas on the waveguide. A sample containing target analyte is treated with a light-responsive compound such that it binds to the target analyte to form a conjugate and the conjugate is applied to the probes on the waveguide. A laser light is passed into the waveguide so that evanescent waves radiate from the waveguide. Where conjugate has attached to probe there is emission of light different from that emitted by a probe without conjugate attached thereto.
Abstract:
A gel pump operated by a stepper motor may be used to deliver fresh gel to one or more capillaries through one or more manifolds and valves. By controlling the valves, fresh gel delivered by the pump will replace the old gel in the capillaries for an automated gel replacement system. In a different setting of the valves, the manifolds may be purged of the old gel prior to delivery of fresh gel to the capillaries. The gel delivery system may also be combined with an electrophoresis system so that sealing connection capable of withstanding high pressure adequate for gel injection need not be frequently broken when the gel is to be replaced. Manifold/reflector assembly is advantageously used in the system that facilitates electrical circuit for electrophoresis and for gel replacement.
Abstract:
A system and method are disclosed for optically aligning a capillary tube and an excitation laser beam for fluorescence detection applications by utilizing the Raman scatter signals of the capillary tube's contents. For example, Raman scatter by an electrophoretic separation matrix may be used for alignment in a capillary electrophoresis system. Fluorescent material may be present and may also be used for alignment purposes, but is not necessary. The invention employs a parabolic reflector, having apertures through which the capillary tube and the laser beam are guided so that they intersect, preferably at right angles and at the focal point of the reflector. The Raman scatter signals of the material within the capillary tube are collected via a series of filters and this information is used to reposition, if necessary, a focusing lens that directs the excitation beam into the reflector and the capillary tube, so that the Raman scatter signals are maximized. Maximal Raman scatter signals indicate proper alignment of the capillary tube and the excitation beam. Other signals, such as fluorescence emission from the sample, may then be gathered. Adjustment of the focusing lens may be automated so that alignment of the capillary tube and the beam is maintained throughout analysis of the tube's contents. Sequential alignment of an array of capillary tubes with an excitation beam is also disclosed.
Abstract:
Double stranded nucleic acid duplexes serve as universal harvestable and cleavable link systems in a variety of different types of immnuoassays (e.g., sandwich, competitive, etc.). Depending upon the type of assay, at least one specific component involved in the assay system is attached to a first member of a pair of sequences forming a double stranded nucleic acid (i.e., two oligonucleotides comprising substantially complementary sequences). The assay is carried out in the presence of a support to which is attached an oligonucleotide which is the other member of the pair of sequences forming a double-stranded nucleic acid duplex under hybridization conditions. Upon the hybridization of the two complementary oligonucleotides to form a duplex, the component of the assay system to which the first member of the pair of oligonucleotides is attached may thereby be effectively removed from the solution phase and harvested onto the support. Oligonucleotides bound to a support are reusable in multiple successive assays. Moreover, any given support-bound oligonucleotide can be used in accordance with the present invention for the analysis of a variety of different analytes. In many cases, the assay system includes a label to facilitate quantifying the amount of analyte; in others, the amount of analyte may be determined without the use of any extraneous label.
Abstract:
Disclosed herein are protecting groups for exocyclic amino groups of the base cytosine for use in the synthesis of oligonucleotides and oligonucleoside phosphorothioates, the protecting groups being represented by the formula: -CO-(CH2)0-9-CH3. In a particularly preferred embodiment, the base cytosine is protected with acetyl (-CO-CH3), and the oligonucleotide or oligonucleoside phosphorothioate incorporating the protected cytosine is subjected to a cleavage/deprotection reagent comprising methylamine and ammonia.