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Amersham typhoon ip

Manufactured by GE Healthcare

The Amersham Typhoon IP is a phosphorimager designed for the detection and quantification of radiolabeled biomolecules in a variety of samples, including gels, membranes, and microplates. It utilizes a laser-based scanning system to capture high-resolution images of radioactive signals, enabling sensitive and accurate analysis of experimental results.

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8 protocols using amersham typhoon ip

1

Telomerase Activity and Processivity Assays

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Telomerase activity assays were carried out for 1 hour at 30 °C as previously described in reaction buffer (50 mM TRIS-HCl pH 8.0, 50 mM or 150 mM KCl, 1 mM MgCl2) 49 . Assays with telomerase alone were carried out with 50 nM primer A, 50 mM KCl, 10 μM or 50 μM dATP, dTTP, and dGTP, and 0.33 μM dGTP [α−32P] (Perkin Elmer). Telomerase assays to assess POT1/TPP1 stimulation were carried out with 50 nM primer A5, 150 mM KCl, 100 nM POT1/TPP1, 500 μM dATP, dTTP, 3.3 μM dGTP, and 0.33 μM dGTP [α−32P] (Perkin Elmer). POT1/TPP1 was purified as previously described 15 . Telomerase products were separated on 12% poly-acrylamide, 1xTBE, 7 M Urea, sequencing gels and detected using storage phosphor screens (GE Healthcare Life Sciences, BAS-IP MS 3543) and an Amersham Typhoon IP (GE Healthcare Life Sciences). Phosphorylated primer A-2 was used as a loading control. Activity was quantified as total radioactive incorporated per lane normalized to the loading control. To compare activity between 3xFLAG- and 3xFLAG-HaloTag containing telomerase, specific activity was calculated by dividing the activity measured by telomerase assays by the TR levels determined by northern blot. Processivity was quantified as the intensity of products longer than 6 repeats divided by the total signal per lane.
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2

RNA Duplex Unwinding Kinetics by eIF4A1

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RNA duplex was prepared by annealing of 5′-GCGUCUUUACGGUGCUUAAAACAAAACAAAACAAAACAAAA-3′ and 5′-AGCACCGUAAAGACGC-3′, and short RNA strand was radiolabeled by γ 32P-ATP (Perkinelmer) and T4 polynucleotide kinase (New England Biolabs) (Jankowsky and Putnam, 2010 (link); Floor et al., 2016 (link)). In 30 l reaction scale, 10 M recombinant eIF4A1 and 20 nM of the radio-labeled RNA duplex was incubated in 40 mM Tris-HCl pH 7.5, 2 mM HEPES-NaOH pH 7.5, 15 mM NaCl, 2 mM ATP, 2.5 mM MgCl2, 0.01% IGEPAL CA-630, 1% glycerol, 2 mM DTT, and 2 μM complementary DNA (5′-AGCACCGTAAAGACGC-3′) at 37°C. The reaction was quenched by an addition of equal amount of 2× Gel Loading Dye, Purple (New England Biolabs) and run on native TBE polyacrylamide gel, 20%. The images were obtained by Amersham Typhoon IP (GE Healthcare).
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3

Detecting DNA Adducts via TLC Postlabelling

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The nuclease P1 enrichment version of the thin-layer chromatography (TLC) 32P-postlabelling assay was used to detect DNA adducts as reported [14 ,24 (link)]. After chromatography, TLC sheets were scanned using phosphor-imaging technology (Amersham™ Typhoon IP; GE Healthcare). Adduct levels were calculated as relative adduct labelling (RAL) values, which represent the ratio of count rates of adducted nucleotides (adducts) over count rates of total (adducted plus normal) nucleotides in the DNA sample analysed. A deoxyadenosine-3′-monophosphate (dAp) standard was labelled in each experiment to estimate the count rates of total nucleotides. Results are expressed as DNA adducts/108 nucleotides.
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4

In Vitro and Ex Vivo ARG of [18F]TZ-Z09591

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In order to study the specificity of [18F]TZ-Z09591 in vitro, ARG binding studies were performed on biopsies, and cell pellets sectioned with a cryostat microtome (Micron HM560), and mounted on glass slides. See supplemental materials for details on the protocol. The samples, optionally pre-treated with blocking compound, were incubated in a solution containing 5 nM of [18F]TZ-Z09591 (0.1 MBq/mL) for one-hour incubation at room temperature, followed by washes in cold PBS / 1% bovine serum albumin (BSA) solution and cold Milli-Q water. A reference consisting of a 10µL drop of the radiotracer-containing solution of known radioactivity was placed on an absorbent paper glued to a glass slide. The sections and reference were then placed in contact with a phosphor-imaging plate overnight. Once the exposure was complete, the plate was scanned by a phosphor-imager system (Amersham Typhoon IP, GE Healthcare). The ImageJ software (ImageJ 1.45S) was used to visualize and analyze the sections. The data obtained from in vitro ARG are expressed as fmol/mm3.
Ex vivo autoradiography follow the same protocol, except that the organs collected from animals injected with [18F]TZ-Z09591 were snap-frozen, and the sections obtain from these were directly placed in contact with a phosphor-imaging plate.
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5

Quantifying eIF4A1 ATP Binding Kinetics

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Ten μM of recombinant eIF4A1 proteins and 0.1 μM of γ 32P-ATP (Perkinelmer) were incubated for 15 min at 37°C and then UV-exposed for 1500 mJ/cm2 at 254 nm (Iwasaki et al., 2016 (link)). The complexes were separated in SDS-PAGE and the images were obtained by Amersham Typhoon IP (GE Healthcare).
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6

Small RNA Northern Blot Analysis

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Small RNA northern blot analyses were performed as previously described (Choi et al., 2020) . Total RNA was extracted from 10-day-old seedlings of WT, fha2-2, hyl1-2, and fha2-2 hyl1-2 using XENOPURE reagent (Xenohelix, Jeonju-si, Republic of Korea). The extracted RNA was precipitated twice with 2-propanol (100% and 75%) and dissolved in 50% formamide. The purified RNA was separated using 5%-15% denaturing polyacrylamide gel electrophoresis (National Diagnostics, Atlanta, GA). The resolved RNA was transferred onto a nylon membrane (Amersham, Amersham, UK). The membrane blots were incubated with endlabeled DNA probes for 12 h for hybridization (Ambion, Austin, TX). The blots were then washed twice with washing buffer (saline-sodium citrate and 0.1% sodium dodecyl sulfate, SDS) for 20 min each. Hybridization signals were detected using Amersham Typhoon IP (GE).
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7

eIF4A1 ATPase Activity Assay

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In 20 μl reaction scale, 10 μM recombinant eIF4A1 and 0.25 μM γ 32P-ATP (Perkinelmer) are incubated in 20 mM HEPES-NaOH pH 7.5, 150 mM NaCl, 10% glycerol, 1 mM DTT, and 1 mM MgCl2 at 37°C. The reaction was quenched by adding the equal volume of 200 mM Tris-HCl, pH 7.5, 25 mM EDTA pH 8.0, 300 mM NaCl, and 2% sodium dodecyl sulfate (SDS), spot on thin layer chromatography plate (Polygram CEL 300 PEI / UV254, Macherey-Nagel), and developed by 0.45 M NH4SO4. The images were obtained by Amersham Typhoon IP (GE Healthcare).
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8

Telomerase Activity and Processivity Assays

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Telomerase activity assays were carried out for 1 hour at 30 °C as previously described in reaction buffer (50 mM TRIS-HCl pH 8.0, 50 mM or 150 mM KCl, 1 mM MgCl2) 49 . Assays with telomerase alone were carried out with 50 nM primer A, 50 mM KCl, 10 μM or 50 μM dATP, dTTP, and dGTP, and 0.33 μM dGTP [α−32P] (Perkin Elmer). Telomerase assays to assess POT1/TPP1 stimulation were carried out with 50 nM primer A5, 150 mM KCl, 100 nM POT1/TPP1, 500 μM dATP, dTTP, 3.3 μM dGTP, and 0.33 μM dGTP [α−32P] (Perkin Elmer). POT1/TPP1 was purified as previously described 15 . Telomerase products were separated on 12% poly-acrylamide, 1xTBE, 7 M Urea, sequencing gels and detected using storage phosphor screens (GE Healthcare Life Sciences, BAS-IP MS 3543) and an Amersham Typhoon IP (GE Healthcare Life Sciences). Phosphorylated primer A-2 was used as a loading control. Activity was quantified as total radioactive incorporated per lane normalized to the loading control. To compare activity between 3xFLAG- and 3xFLAG-HaloTag containing telomerase, specific activity was calculated by dividing the activity measured by telomerase assays by the TR levels determined by northern blot. Processivity was quantified as the intensity of products longer than 6 repeats divided by the total signal per lane.
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