Abstract:
Disclosed herein are surface activated, organic polymers useful for biopolymer synthesis. Most preferably, aminated polypropylene is used for the synthesis of oligonucleotides thereto, and these devices are most preferably utilized for genetic analysis of patient samples.
Abstract:
A capillary and capillary retaining system including a capillary assembly (20) having first and second end holders (32, 36). The first and second end holders (32, 36) are adapted to be received by first and second retainers (22, 24). The first end holder (32) may include protruding portions (48, 50) and the first end retainer includes clips to receive the protruding portions. The second end holder may include opposite recesses and the second retainer is adapted to receive optical cables that are received within the recesses to retain the second end holder. Locks retained by the second end retainer cooperate with grooves in the optical cables to retain the optical cables.
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:
The present invention directed to a plug (16) for sealing a centrifuge tube (10). The plug (16) of the present invention is shaped and sized to provide an interference fit between the plug (16) and the tube stem (12) of the centrifuge tube. In the described embodiment, the plug is configured with a tapered body narrowing to a flared end (22). To facilitate the insertion and removal of the plug with moderate force, without compromising the restraining capability of the interference fit, the area of interference contact between the flared end and the filler stem is strategically reduced. An o-ring is provided in an annular groove (20) around the tapered body. The flared end (22) creates an interference fit with a tapered filler stem (12) whereby the plug (16) is secured in the filler stem (12) with a snapping action when the flared end (22) of the plug (16) extends into the tube beyond the tapered filler stem (12). In this snap-in position, the plug (16) is secured in the filler stem (12), providing an initial seal; such seal increases upon centrifugation by a self-sealing mechanism, either attributed to the internal hydrostatic pressure in the tube and/or the force of a support spacer on the plug. After centrifugation, the snap coupling between the filler stem and the plug securely retains the plug against any residual internal pressure built up within the tube created by deformation of the centrifuge tube either from centrifugation or through handling of the tube by the user.
Abstract:
The present invention provides processes for isoelectric focusing ("IEF") and associated detection, which incorporates a dynamic means of electroosmotic flow ("EOF") control during IEF and/or after IEF to effect solute mobilization. In accordance with the present invention, the EOF control during IEF and/or solute mobilization after IEF are accomplished by applying an external electric field, relative to an internal electric field, to modify the electroosmotic flow in the capillary. This can be done by disposing a conductive member at one or more locations outside and along the buffer column in the capillary. The conductive member may be statically charged or caused to conduct a current to create the external required electric field. The applied external electric field may be adjusted, relative to the external electric field, during IEF necessary to reduce or completely suppress EOF to prevent flow of the buffer. Upon the completion of IEF (irrespective of the method of reducing or removing EOF during IEF), the external electric field is adjusted, relative to the internal electric field, such that the buffer carrying the focused solutes are moved electroosmotically through the capillary past a detection point. The present invention is applicable to internally coated capillary which suppresses EOF even in the absence of the external electric field.
Abstract:
A method for blocking suppression of at least one of the natural killer (NK) and lymphocyte activated killer (LAK) immune defense mechanisms in lymphocytes of cancer patients comprises administering to a cancer patient an agent capable of blocking the immune defense suppressive activities of a peptide capable of inducing a detectable decrease in the structuredness of the cytoplasmic matrix in lymphocytes isolated from a patient with cancer (an SCM-factor peptide) in a quantity sufficient to block suppression of at least one of the natural killer (NK) and lymphocyte activated killer (LAK) immune defense mechanisms. The agent can comprise an antibody, an antisense peptide, or a factor present in blood plasma. The invention also includes pharmaceutical compositions for blocking suppression of immune defense and kits for stimulating immune response of cancer patients, as well as immunization methods to induce antibody to SCM-factor peptides.
Abstract:
The present invention makes use of a single detector to monitor several process functions, e.g. reaction efficiency, reagent flow rates, the presence of empty reagent reservoirs, the absence of a chemical reactor column in the system, blockage of flow system, etc., at a single location in the flow system. In accordance with the detection scheme of the present invention, only one detector is required to accomplish the same, if not more, functions as many detectors in the prior art instruments. In the described embodiment, an optical detector is positioned downstream of a chemical reaction chamber. This detector monitors the effluent from the reaction chamber to monitor the reaction efficiency. It also monitors the system functions upstream of the reaction chamber. System flow rate is monitored by detecting the presence of a gas bubble which has been introduced into the system at a known instance. Depletion of reagents in the reservoirs can be detected by monitoring the absence of the reagents at the detector at times when the reagents are expected. The flow system may be periodically diagnosed to check for flow blockage or missing flow component, by monitoring the flow past the detector which corresponds to a predetermined succession of reagents introduced into the system. Any deviation from a predictable succession of changes in the flow monitored by the detector indicates possible blockage of the flow delivery system or missing flow components.
Abstract:
The present invention is directed to a technique that provides enhanced separation resolution in electrophoresis. This technique involves the use of a time-varying field strength, which may be progressively increasing or decreasing, constant or otherwise, as a function of time. The shape of the field strength with respect to time may be continuous or stepwise over time, monotonic or otherwise. Because the mobility of different size species is a function of the applied electric field, the use of a nonuniform (time varying) electric field increases the resolving power of electrophoresis. This technique has been found to provide enhanced resolution of double-stranded DNA molecules in capillary polyacrylamide gel electrophoresis. It has been found that enhanced separation of DNA restriction fragments of 1 to more than 1000 base pairs in size has been achieved employing the technique of the present invention.
Abstract:
The present invention provides a mechanism for bolting a rotor to a hub without introducing excessive radial stress around the bolt holes when the rotor is operating at high speed. The rotor (1) has a slot cut (35) through its center to eliminate radial stress perpendicular to the slot and thereby avoid the problems of stress cracking of the otherwise weak section. The mounting bolts (501) are necked down and not threaded at the surface of the hub. The bolts are threaded into the hub (501A) at a substantial distance from the top surface of the hub (503) so that they can flex and so that the center of the rotor (1) can move out relative to the hub (32). The hub rotor interface (503) is lubricated to facilitate radial motion of the center of the rotor.
Abstract:
A tridentate conjugate has three chemical moieties, or tridentate members, attached through an appropriate spacer moiety. At least two of the tridentate members are relatively small molecules, usually less than about 7,000 Daltons in size. The particular appropriate spacer moiety selected for a tridentate imparts certain steric properties to the tridentate conjugate. In one embodiment, the binding of a macromolecular specific binding partner to one of the tridentate members sterically inhibits the binding of a different macromolecule to another tridentate member. In another embodiment, the binding of a first tridentate member to a macromolecule restricts the subsequent binding of a second tridentate member to a proximate location on the same macromolecule.