Millennium™ RNA Markers-Formamide

はい、それぞれのターゲットで異なるThreshold値を設定しても構いません。 例えば内在性コントロール遺伝子と他のターゲット遺伝子に対して異なるThreshold値を設定しても大丈夫です。 詳細はABI PRISM® 7700 Sequence Detection System: Setting Baselines and Thresholds for more information on setting thresholdsをご確認ください。

(1) RNA was not completely denatured. Electrophorese RNA under denaturing conditions. Use urea, formamide or formaldehyde gels, or glyoxal-treated RNA.

(2) For glyoxal-treated RNA, a buffer gradient formed during electrophoresis. Recirculate buffer during electrophoresis to prevent gradient formation.

Extra bands appear in RNA Ladders for a few reasons:

(1) RNA was not completely denatured. Electrophorese RNA under denaturing conditions. Use urea, formamide or formaldehyde gels, or glyoxal-treated RNA.

(2) Extra bands may be a result of using formaldehyde that is not fresh; the pH becomes acidic in older formaldehyde. In our hands, when fresh formaldehyde with neutral pH was used, the extra bands disappeared.

(3) Alternatively, if the extra bands appear after hybridization, it could be that the gel purified probe contains contaminating vector DNA (pUC or pBR) that hybridizes to RNA Ladder template DNA.

Missing RNA bands may be due to:

(1) A small amount of RNA diffused out of gel during extended destaining. Minimize destaining time. Destaining for 2 hours is sufficient for most applications.

(2) RNA bands of similar molecular size were not resolved. Use the correct gel type and denaturing conditions.

RNA was exposed to UV light for extended periods of time. Minimize exposure to UV light. Stain and destain gels in the dark and photograph the gel immediately.