| Description | If the serum will not be used up within a short period of time, dispense after thawing and store aliquot under appropriate conditions for long-term storage. The volume of serum will increase by 10% after freezing, so when dispensing serum into tubes, leave some space in the tube to avoid tube If the serum will not be used up within a short period of time, dispense after thawing and store aliquot under appropriate conditions for long-term storage. The volume of serum will increase by 10% after freezing, so when dispensing serum into tubes, leave some space in the tube to avoid tube cracking during the freezing.After the serum is thawed completely, the serum can be heated at 56℃ for 30 minutes to inactivate the complement in serum. Unless necessary, heat-inactivation of the serum is not recommended for general use because heat treatment will result in precipitation of serum and decreasing of serum quality. Complement is involved in reactions such as cytotoxicity, contraction of smooth muscle cells, release of histamine from mast cells and platelets, enhancement of phagocytosis, and promotion of chemical chemotaxis and activation of lymphocytes and macrophages.The serum should be thawed slowly and gradually. Thaw the serum stored at -15~-40℃ in 4℃ refrigerator for approximately one day, and make aliquot after it is thawed thoroughly. During the thawing process, shake gently every 2 hours (avoid the formation of air bubbles) to homogenize the component and reduce the occurrence of precipitation. Do not thaw the serum stored at -20℃ or lower temperatures directly in a 37℃ water bath to avoid protein agglomeration and precipitation in serum due to large temperature changes.The floc-like precipitates in serum are mainly denatured fibrin and lipoproteins in serum after long-term storage at 4℃. These flocs do not affect the quality of the serum and can be left untreated. If necessary, the flocs can be removed by centrifugation at 400×g for 5 minutes. However, it is not advisable to remove by filtration as the flocs may block the filter membrane. The precipitates in the serum after heat inactivation will increase significantly. Some of these deposits look like "black dots" under the microscope and are often misinterpreted as microbial contamination because the Brownian motion of these "dots" is magnified under the microscope and appear to be swimming. Usually, these small black spots do not affect cell growth, but if microbial contamination of the serum is suspected, it should be immediately replaced with new serum. Users can dilute the serum with culture medium to 10% concentration and incubate for 1-3 days, and observe whether the small black dots increase sharply, or spread an appropriate amount of serum on LB plate to determine whether there is microbial contamination. Do not leave the serum at 37℃ for too long, as the serum will gradually become cloudy and lose some active ingredients, thus affecting the quality of the serum.This product is for R&D only. Not for drug, household, or other uses.For your safety and health, please wear a lab coat and disposable gloves during the operation... Read More | Inquire | Taq MasterMix is a premixed system composed of Taq DNA Polymerase, Mg2+, dNTPs, as well as PCR stabilizers and enhancers, with a concentration of 2 ×. The pre prepared PCR mixture makes the operation simpler and faster, and can minimize human error and contamination to the greatest extent Taq MasterMix is a premixed system composed of Taq DNA Polymerase, Mg2+, dNTPs, as well as PCR stabilizers and enhancers, with a concentration of 2 ×. The pre prepared PCR mixture makes the operation simpler and faster, and can minimize human error and contamination to the greatest extent possible. The original MasterMix formula results in high yield, strong repeatability, and good stability of amplified products. This product has been added with a dye (blue), and can be directly subjected to electrophoresis detection after the reaction is completed. The amplified PCR product has an "A" base attached to its 3 'end, making it suitable for direct use in T/A cloning. Mainly suitable for PCR amplification of DNA, DNA sequencing and other experiments. T665590Component5 mL25 mLStorageT665590A2×Taq MasterMix (Dye)5×1 mL5×5 mL-20℃. Avoid freeze/thaw cycle.T665590BddH₂O5×1 mL5×5 mL-20℃. Avoid freeze/thaw cycle.2×Taq MasterMix contains Taq DNA Polymerase, 3 mM Mg Cl₂ and 400 µM each dNTP. Quality control:After testing, there was no exogenous nuclease activity; PCR method for detecting residual DNA without host; Can effectively amplify single copy genes from multiple genomes.Usage:The following is an example of a PCR reaction system and reaction conditions for amplifying a 1 kb fragment using human genomic DNA as a template. In practical operation, corresponding improvements and optimizations should be made based on the template, primer structure, and target fragment size.1. PCR reaction system Reagent 50 µlReaction system Final concentration 2×Taq MasterMix（Dye） 25 µL 1× Forward Primer，10 µM 2 µL 0.4 µM Reverse Primer，10 µM 2 µl 0.4 µM Template DNA <0.5 µg <0.5 µg/50 µL ddH2O up to 50 µL /Attention: The primer concentration should be between 0.1 and 1.0 as the final concentration µ M serves as a reference for setting the range. In the case of low amplification efficiency, the concentration of primers can be increased; When non-specific reactions occur, the primer concentration can be reduced to optimize the reaction system.2. PCR reaction conditions Step Temperature Time / Pre denaturation 94℃ 2 min / Denaturation 94℃ 30 s 25-35 cycles Anneal 55-65℃ 30 s 25-35 cycles Extend 72℃ 30 s 25-35 cycles Finally extended 72℃ 2 min / Attention:1) In general experiments, if the annealing temperature is 5 ° C lower than the melting temperature Tm of the amplification primer, and the ideal amplification efficiency cannot be achieved, the annealing temperature should be appropriately reduced; When non-specific reactions occur, increase the annealing temperature to optimize the reaction conditions.2) The extension time should be set according to the size of the amplified fragment. The amplification efficiency of Taq DNA Polymerase in this product is 2 kb/min.3) The number of cycles can be set based on the downstream application of the amplification product. If the number of cycles is too small, the amplification amount is insufficient; If there are too many cycles, the probability of mismatches will increase, and non-specific backgrounds will be severe. So, while ensuring product yield, the number of cycles should be minimized as much as possible... Read More | Parathyroid Hormone (1-34), human, biotinylated is a probe for the parathyroid hormone receptor, can be used for analyzing the interaction between parathyroid hormone and parathyroid hormone receptors in living cells and for purifying hormone-receptor comAppearance:SolidBiological Activity:Parathyroid Hormone (1-34), human, biotinylated is a probe for the parathyroid hormone receptor, can be used for analyzing the interaction between parathyroid hormone and parathyroid hormone receptors in living cells and for purifying hormone-receptor comAppearance:SolidBiological Activity:Parathyroid Hormone (1-34), human, biotinylated is a probe for the parathyroid hormone receptor, can be used for analyzing the interaction between parathyroid hormone and parathyroid hormone receptors in living cells and for purifying hormone-receptor com... Read More | Carboxypeptidase B catalyzes hydrolysis of the basic amino acids lysine, arginine and histidine from theC-terminal end of polypeptides. The molecular weight is 34,500 daltons, the pH optimum is 8.0, and pI is 6.0.Carboxypeptidase B is competitively inhibited by arginine and lysine. The enzyme is Carboxypeptidase B catalyzes hydrolysis of the basic amino acids lysine, arginine and histidine from theC-terminal end of polypeptides. The molecular weight is 34,500 daltons, the pH optimum is 8.0, and pI is 6.0.Carboxypeptidase B is competitively inhibited by arginine and lysine. The enzyme is also inhibited by metal chelating agents, e.g., EDTA. Recombinant Carboxypeptidase B (EC 3.4.17.2) is expressed in E.Coli and purified by high pressure liquid chromatography. There is no trace of other enzyme (such as carboxypeptidase A and chymotrypsin) activity. No protease inhibitors such as PMSF are present in the preparation.Animal origin free:eliminate the risk of virus presence, or of any other potential adventitious agents found in animal-derived carboxypeptitase B.Stability:A sterile recombinant carboxypeptidase B lyophilized eliminates the risk of contamination and decreases the chances of activity loss in the process of transport and storage. High purity:1) Recombinant carboxypeptidase B provides increased specific activity and eliminates contaminating protease activities found in extracted enzymes with lower purity level. 2) No other contaminating proteases such as chymotrypsin and carboxypeptidase A. 3）Less than 10ppm of recombinant trypsin... Read More |