摘要:
Compositions of novel polymerase variants and methods of identifying, making and using these novel polymerases are described. The variants have been shown to have advantageous properties such as increased thermostability, deoxyuridine nucleoside triphosphate tolerance, salt tolerance, reaction speed and/or increased reverse transcriptase properties. Uses for these improved enzymes have been demonstrated in isothermal amplification such as LAMP. Enhanced performance resulting from the use of these variants in amplification has been demonstrated both in reaction vessels and in dedicated automated amplification platforms.
摘要:
Methods and compositions are provided for repairing a polynucleotide so that it can be copied with improved fidelity and/or yield in, for example, an amplification reaction. This involves the use of a reaction mixture that includes a ligase and a cofactor selected from NAD+ or ATP and incubating the polynucleotide with the reaction mixture in the absence of Endonuclease VI.The reaction mixture may further contain an AP endonuclease and a polymerase. If used, these enzymes may be selected according to their ability to withstand high temperatures. For example, the reaction mixture may be used prior to a polynucleotide synthesis reaction in which case enzymes that are not thermophilic may be used. The repair reaction is not time sensitive with respect to seconds, minutes or hours of incubation in the enzyme mixture in as much as the repair is effected rapidly and prolonged incubation is not generally adverse.
摘要:
Compositions and methods are provided for preserving the thermostability of an endonuclease in the presence of DNA for uses that include DNA repair. The compositions and methods include the presence of zinc ions.
摘要:
Novel proteins having DNA polymerase are described which have utility in amplification reactions and have improved properties over Bst polymerase such as for example enhanced reverse transcriptase activity.
摘要:
A provisioning engine provisions spectrum into an allocable spectrum object. The provisioning engine includes an interface configured to receive inputs of available spectrum information and a plurality of provisioning parameters. The plurality of provisioning parameters include at least one signal strength limit, and may include at least first and second signal strength limits that may be boundary strength limit and an allocation strength limit. A controller is configured to execute a spectrum provisioning application that is stored in a memory and, by execution of the spectrum provisioning application, the provisioning engine is configured to generate an allocable spectrum object in accordance with the provisioning parameters. Spectrum encompassed within the spectrum object is allocable by an allocation engine to spectrum users in accordance with the provisioning parameters. An allocation engine in turn allocates spectrum encompassed within the provisioned spectrum object in accordance with the provisioning parameters.
摘要:
Compositions and methods are provided for enhancing enzymatic ligation between nucleic acid fragments that relies on one or more small molecule enhancers having a size of less than 1000 daltons. For example, enhancement of ligation efficiencies are observed for double-stranded nucleic acid fragments that are blunt-ended, have a single nucleotide overhang at the ligation end, or have staggered ends compared to ligation under similar conditions in the absence of the one or more small molecule ligation enhancer. The use of small molecule enhancers for ligating nucleic acids results in an increased number of transformed host cells after transformation with the ligated molecules. This enhancement can be observed with chemically transformed host cells and with host cells transformed by electroporation.
摘要:
Methods and compositions are provided for repairing a polynucleotide so that it can be synthesized efficiently with improved fidelity and yield in, for example, an amplification reaction. This involves the use of a reaction mixture that includes a ligase and a cofactor selected from NAD+ or ATP and incubating the polynucleotide with the reaction mixture in the absence of Endonuclease VI.The reaction mixture may further contain an AP endonuclease and a polymerase. These enzymes are optionally selected according to their ability to withstand high temperatures so they can be included in an amplification mixture. The reaction mixture may be used prior to a polynucleotide synthesis reaction in which case enzymes that are not thermophilic may be used. The repair reaction is not time sensitive with respect to seconds, minutes or hours of incubation in the enzyme mixture.
摘要:
A recombinant BSA (rBSA) that (a) substantially lacks deoxyribonuclease activity as determined by incubating rBSA with linear DNA overnight and gel electrophoresis, (b) lacks animal viruses associated with animal-derived cell growth supplements; and (c) is capable of stabilizing DNA proteins is provided. Methods for making the rBSA and using it to stabilize enzymes are also provided.
摘要:
Methods and compositions are provided for repairing a polynucleotide so that it can be synthesized efficiently with improved fidelity and yield in, for example, an amplification reaction. This involves the use of a reaction mixture that includes a ligase and a cofactor selected from NAD+ or ATP and incubating the polynucleotide with the reaction mixture in the absence of Endonuclease VI.The reaction mixture may further contain an AP endonuclease and a polymerase. These enzymes are optionally selected according to their ability to withstand high temperatures so they can be included in an amplification mixture. The reaction mixture may be used prior to a polynucleotide synthesis reaction in which case enzymes that are not thermophilic may be used. The repair reaction is not time sensitive with respect to seconds, minutes or hours of incubation in the enzyme mixture.
摘要:
A spring for each end of a tubular carrier to secure them against sliding and slipping within the tube. The spring having a tongue carrying on its tip an upwardly jutting pin which is upwardly resilient. The pin latches into through apertures in the top wall of the carrier and may have a camming means forward of the pin comprising a pair of ramps extending forward and down from the pin and symmetrical about a longitudinal axis.The tongue has a base and in one embodiment extends rearward of the base. In a preferred embodiment the tongue has a base and extends forward of the base. The tongue may have a surround, and in the preferred embodiment the tongue may extend forward of a lower ledge at the rear of the surround.In use, as the spring enters the carrier against a chip, the pin is cammed down. When the spring is compressed against the chip sufficiently, the pin enters an aperture in the top wall of the carrier, and latches the spring. Thus the spring holds the chip firmly in place relative to the carrier and prevents accidental chipping or damage to the chip.