デオキシリボ核酸 溶液 from calf thymus

A ready-to-use solution of high quality double-stranded template DNA isolated from the thymus of male and female calves. The solution is supplied at a concentration of 9 - 12 mg/ml .

Sigmaは、ノ-ザン・サザンブロット法のブロッキング剤として、複数種の超音波処理した変性DNAを濃度10 mg/mLの水溶液として提供しています。

核酸ハイブリダイゼ-ションにおけるシグナル-ノイズ比は多くの要素の影響を受けます。例えば溶媒(ホルムアミド)の存在、ハイブリダイゼ-ション温度、ハイブリダイゼ-ションの長さ、ハイブリダイゼ-ション溶液量、撹拌の程度や方法、阻害剤の使用、プロ-ブの濃度や比活性、核酸の再結合率を高める分子薬の使用、メンブレン洗浄のストリンジェンシ-などがあげられます。

プロ-ブと基質との非特異的ハイブリダイゼ-ションの抑制には、ブロッキング試薬が必要です。通常はブロッキング剤、洗浄剤、断片化した変性DNAを併用します。Sigmaは、ノ-ザン・サザンブロット法および他の核酸ハイブリダイゼ-ションのブロッキング剤として、複数種の超音波処理した変性DNAを提供しています。

Deoxyribonucleic acid solution from calf thymus is suitable for use as a blocking agent in Southern hybridizations. It was used as negative control in DNA-DNA hybridization experiments using genomic DNA preparations of Vibrio parahaemolyticus and Vibrio alginolyticus. It was used as a standard for DNA quantification by fluorescent assay.

Many factors contribute to the signal-to-noise ratio in nucleic acid hybridizations. These factors include the presence of solvent (formamide), hybridization temperature, length of hybridization, volume of hybridization solution, degree and method of agitation, use of blocking reagents, concentration and specific activity of the probe, use of molecular agents to increase the rate of nucleic acid reassociation, and the degree of stringency used during the washing of the membrane. 

In order to decrease any non-specific hybridization of the probe to a substrate, blocking agents must be used. Generally, a combination of blocking reagent, detergent, and denatured, fragmented DNA is used to accomplish this. Sigma offers sonicated, denatured DNA from a variety of species for use as a blocking agent in Northern and Southern blotting and other nucleic acid hybridization techniques.

Deoxyribonucleic acid solution from calf thymus has been used in in situ hybridization and microarray hybridization.

このDNAは、フェノ-ル-クロロホルム抽出、エタノ-ル沈降、超音波処理した一本鎖断片で、587塩基および 831塩基のマ-カ-断片と共に移動します。

DNA in solution will reanneal on standing at room temperature so it is recommended to boil the solution for 10 minutes and then cool on ice for at least 5 minutes prior to use.