Abstract:
An analytical biochemistry system featuring a substrate with reactants immobilized thereon at fixed, known locations, a holder supporting the substrate and a manipulator for transporting the holder to a fixed sample and to an inspection station. The reactants are binding agents for a target biomolecule in a sample which forms a bound substance having a detectable characteristic. The holder may be a standard pipettor, optionally carried by a robot arm or hand as the manipulator to contact the sample for detection of the presence of target biomolecules within the sample. In one embodiment, the holder is a pipette tip within which the substrate is housed, or it may be a pipette adapter which bears the substrate and fits within the sample wells of a standard microtiter plate. After appropriate incubation, the substrate and holder may be moved from contact with the sample, and the substrate may be exposed to any necessary development steps before being moved by the manipulator to a location for probing, such as by a beam. Probing of the substrate is performed to identify binding or complexing of target biomolecules of the sample with the reactants immobilized on the substrate, and may be accomplished via fluorescence detection, light scattering, autoradiography, or some other detection method.
Abstract:
A system and method of operating a centrifuge is disclosed. The operational parameters of the centrifuge are determined on the basis of the experimental protocol selected by the user. Parameters relevant to the particular experimental protocol are supplied by the user, while the run-time operating parameters of the centrifuge are automatically computed by the system. The centrifugal protocols contemplated in the present invention include pelleting, rate-zonal and isopycnic experiments. Depending upon the specific experimental protocol, the user must provide certain minimum information such as sedimentation rate and gradient concentrations used in the experiment. The user also must identify the rotor to be used, unless the centrifuge device is capable of auto-identification of rotors. For unusual situations, the user may set the specific operating parameters of a centrifugal run in order to provide for customized experiments.
Abstract:
A sample having both positively and negatively charged components may be separated during the same run by injecting a plug of sample at both ends of the capillary and applying an electric field in the capillary, where there is insufficient electroosmotic flow in the capillary to reverse sample migration direction, such as in the case of a gel-filled column.
Abstract:
A solid support based hybridization assay is provided which allows for the systematic and reproducible analysis of repeat and tandem repeat oligonucleotide sequences of DNA and RNA by hybridization to a reverse dot blot array comprising strings of such repeats complementary to those found in particular nucleic acid targets (e.g., analyte PCR product). An addressable library (i.e., an indexed set) of complementary repeats is synthesized on a suitable support. Preferably, the support comprises a low fluorescent background support, thereby facilitating the use of non-radioisotopic modes of detection (such as fluorescence of chemiluminescence); particularly suitable in this regard is an aminated polypropylene support or similar material. Preferred arrays permit screening of DNA and RNA samples for complete sets of particular types of nucleotide repeat sequences (e.g., all nucleotide doublet or triplet repeats).
Abstract:
An aqueous, liquid-stable thiol activator solution is disclosed. The solution can include a thiol activator, such as N-acetyl-L-cysteine and a stabilizing agent, such as mannitol. The thiol is stabilized in the aqueous solution for at least about one year under storage conditions and for at least about 28 days under open-bottle conditions. The solution can be used as a reactivator of creatine kinase catalytic activity.
Abstract:
Deoxyribonucleotide and ribonucleotide derivatives of general formula (I), wherein R represents -CR'R"-Ar, in which Ar is selected from the group consisting of unsubstituted or substituted aryl (as hereinafter defined) and R' and R" are independently selected from the group consisting of hydrogen and lower alkyl; one of -R and R is a hydroxyl-protecting group and the other is a group suitable for synthesis of polynucleotides or for attachment of the nucleotide to a solid support; R is selected from the group consisting of hydrogen, -OH and protected hydroxyl; and B represents a divalent radical corresponding to a purine or pyrimidine base. When synthesis is carried out using these derivatives, the deprotection procedure is reduced to an essentially instantaneous process. The derivatives have acceptable shelf life and are very stable to conventional DNA synthesis conditions. Particularly preferred are those compounds wherein Ar is mono- and dihalo-substituted phenyl.
Abstract:
Coated capillary electrophoresis columns and methods for their use in electrophoretic separations are disclosed. The coated capillary columns include a length of tubing having an interior surface having an interconnected polymeric coating. The interconnected polymeric coating includes a hydrophobic polymeric functionality covalently bound to the interior surface and a hydrophilic polymer interconnected with the hydrophobic polymeric functionality. Exemplary columns are prepared by causing an Si-OH reactive compound, having a hydrophilic polymeric functionality, to react with Si-OH functionalities on the interior surface of capillary columns. Then causing a hydrophilic monomer to polymerize in contact with the hydrophobic polymeric functionality forms a coating of interconnecting hydrophilic and hydrophobic polymers.
Abstract:
Disclosed herein, inter alia, are Inverse Linkage Oligonucleotides ("ILO") useful in enzymatic process. Particularly preferred ILOs are amenable to enzymatic elongation from either, or most preferably, both termini. In a particularly preferred embodiment, each terminus of an ILO has an enzymatically functional 3' group. Accordingly, under appropriate conditions and in the presence of, e.g., dNTPs, enzyme, sample DNA, and ILO comprising a first region complementary to a first region of the sample DNA and a second region complementary to a second, different region of the sample DNA, exponential amplification of the sample DNA can be effectuated.
Abstract:
A solid-phase nucleotide synthesis intermediate useful for chemical synthesis of oligodeoxyribonucleotides and oligoribonucleotides comprises: (1) a particulate support comprising a porous polymer whose backbone comprises optionally substituted acrylate or methacrylate moieties; (2) a nucleoside; and (3) a linker having a first and a second end, the first end being covalently attached to the particulate support and the second end being covalently attached to the nucleoside, the linker spacing the nucleoside at least 3 atoms away from the polymer. The linker can comprise at least one optionally substituted aliphatic diamine. Alternatively, the linker can comprise a polyethylene glycol moiety. Preferably, the porous polymer is a methacrylate-vinylidene polymer. The solid-phase support thus produced can be used for oligodeoxyribonucleotide synthesis by either the phosphite-triester or the phosphotriester processes.
Abstract:
The present invention is directed to the implementation of a multi-port rotary valve in an automated chemistry processing instrument which reduces chemical reagent cross contamination and simplifies system design and control. One or more multi-port rotary valves are used in conjuction with isolation valves which are each dedicated for an associated reagent in the system. According to one embodiment of the present invention, the instrument utilizes a multi-port valve which defines several fluid branches each associated with a reagent. The valve has a common inlet and common outlet which are selectively brought into fluid communication with the branches in a controlled sequence. At each branch, there is a two-way three-port isolation valve which controls introduction of an associated reagent into the branch. When a branch is selected by the rotary valve, the reagent introduced into the branch is delivered out of the common outlet by the flow from the common inlet. According to another embodiment of the present invention, the reagents are introduced through isolation valves between two multi-port rotary valves.