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33 protocols using coolsnap hq2

1

Microscopic Imaging of C. neoformans

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For microscopy experiments, overnight cultures of C. neoformans strains H99 or H99Nop1-GFP were diluted to 1 × 106 CFU/ml in 3 ml YPD with 2 μg/ml PIK-75 or DMSO (0.02%) and incubated for 24 h at 37°C. Cells were washed three times in sterile PBS, stained with 20 μg/ml CFW in PBS (Fluorescent brightener 28, Sigma, F3543), and incubated for 20 min at RT in the dark. Cells were imaged on a Nikon epifluorescence microscope with a Cool Snap HQ2 camera and Nikon Elements image acquisition and analysis software. Images were processed in Photoshop only to increase ease of viewing. All images were adjusted equally.
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2

Fluorescence Microscopy of Bacterial Cells

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Fluorescence microscopy was performed on a Nikon Ti microscope equipped with a plan apo 100×/1.4 NA phase-contrast oil objective and a CoolSnapHQ2 camera. Cells were immobilized using 2% agarose pads containing growth medium. Membranes were stained with FM4-64 (Molecular Probes) at 3 μg/mL. DNA was stained with DAPI at 2 μg/mL. Images were cropped and adjusted using MetaMorph software (Molecular Devices). Final figures were prepared in Adobe Illustrator. Image analysis was performed using MicrobeTracker (Sliusarenko et al. 2011 (link)); details are in the Supplemental Material.
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3

Quantifying VSMC Proliferation via EdU Assay

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We used the Click-iT EdU assay (ThermoFisher) according to the manufacturer’s protocol to identify DNA synthesis in proliferating cells [3 ]. Briefly, VSMCs were seeded on cell culture-treated coverslips at 30% confluence and serum-starved for 18 h. Next, cells were incubated for 24 h in complete growth medium containing EdU reagent (the modified thymidine analog 5-ethynyl-2′-deoxyuridine). Incorporation of EdU was determined by labeling with AlexaFluor azide 647, and total nuclei were labeled with DAPI. Coverslips were mounted and imaged by epifluorescence microscopy (Nikon 80i with CoolSnap HQ2). Four 10× images were obtained per coverslip and the fraction of EdU-positive to total nuclei was determined by using the object count function (Nikon NIS Elements Basic Science). Investigators that captured the images and performed data analysis were blinded to the VSMC genotype.
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4

Fluorescence Microscopy of DAPI-Stained Cells

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Fluorescence microscopy was performed on a Nikon Ti microscope equipped with a Plan Apo 100×/1.4 NA phase contrast oil objective and a CoolSnapHQ2 cooled CCD camera. DNA was stained with DAPI (Molecular Probes) at 2 μg/mL. Cells were immobilized using 2% agarose pads containing growth medium. Images were cropped and adjusted using MetaMorph software (Molecular Devices). The final figure preparation was performed in Adobe Illustrator.
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5

Immunohistochemical Analysis of Abca4-/- Rdh8-/- Mouse Retina

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Retinal cryosections of Abca4-/- Rdh8-/- mice aged 2 and 18 months were permeabilized with Triton X100 (0.05% in PBS; 5 min at RT) and saturated with NGS (10% in PBS) or BSA (3% in PBS) during 1 h at RT. For cathepsin D immunostaining sections were depigmented in H2O2 (3% in PBS) during 24 h before staining. Primary antibodies against GFAP, RPE65 and cathepsin D were diluted in 2% NGS or 1% BSA and incubated over night at 4°C and followed by Alexa Fluor® 488 - conjugated secondary antibodies during 1 h at RT. In order to quench lipofuscin auto-fluorescence in RPE a final incubation with TrueBlack® was performed. Sections were stained with Hoechst 33342 to label nuclei and representative pictures were taken using a fluorescence microscope (Nikon TiE) equipped with a CoolSNAP HQ2 camera. For each age retinal cryosections from 3 different mice were used.
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6

Microscopic Imaging and Analysis of mRNA Distribution

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Epifluorescence micrographs were obtained using an epifluorescence microscope (Nikon TiE) using a Cool Snap HQ2 or QuantEM digital camera. To be able to compare the images shown, fluorescence micrographs from the same wavelengths (Cy3 or Cy5) within an individual experiment were acquired with the same exposure time, and the display scales of the representative images from each condition were equalized. For mRNA distribution analysis, serial Z-sections (0.5-μm steps, between 5 and 7 μm total distances) were acquired, and a maximum projection image was generated using the Nikon Elements software. For quantification of the polarization and distribution of mRNAs, a manual mask was generated using ImageJ, and the dispersion and polarization indices were calculated using the script described (Park et al. 2012 (link)). Cells that contained bright STIC probe aggregates were not imaged for mRNA distribution analysis.
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7

Measuring Bacterial Cell Length with Microscopy

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About 10 μl of cell samples were mounted on a number 1.5, 24 × 50 mm (thickness of 0.16–0.19 mm) cover glass slide (Fisher or VWR). Cells were cushioned with a 3% (w/v) agarose gel pad to restrict the movement of the live cells. Cells were optically imaged using a Nikon Eclipse Ti inverted microscope equipped with crossed polarizers and a Photometrics CoolSNAP HQ2 CCD camera using a Nikon 100X oil objective lens. Phase-contrast images of bacterial cells were recorded with an exposure time of 50 ms using Nikon NIS Elements software. Multiple snapshots were collected for each experiment. All images were analyzed to measure the cell length in Oufti (54 (link)) using one single optimized parameter set and manual verification. Confidence intervals of the fraction of elongated cells for each mutant were computed from 1000 replicates of bootstrap resampling (55 ).
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8

Immunofluorescence and Immunoblotting Protocol

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Cells were rinsed in PBS, fixed for 10 min in 4% formaldehyde, and permeabilized for 7 min in 0.25% Triton X-­100 in PBS. Unless otherwise specified, images were acquired on a Nikon Ti­‐E inverted microscope using a CoolSNAP HQ2 camera driven by Nikon Elements software and subsequently deconvolved using the AQI 3D Deconvolution module in Nikon Elements. 2D maximum projections assembled in Elements are shown. Overlays were generated in Photoshop. For immunoblotting, equal numbers of cells were lysed in 2× sample buffer. Proteins were separated by 12% SDS-­PAGE, transferred to nitrocellulose, blocked with 5% milk in TBST and probed with primary and secondary antibodies.
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9

Quantifying Soluble and Insoluble Aβ42

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Soluble and insoluble Aβ42 were extracted according to the Human Brain Aβ42 ELISA (Millipore) manufacturer’s instructions,. Plates were read at 450 nm on a Spectra Max Plus plate reader (Molecular Devices). For Thioflavin S staining, perfused mouse brains were sectioned to 50 μm slices using a vibratome (Leica VT1000S). Slices were then subjected to the following washes: 70% EtOH for 1 minute, 80% EtOH for 1 minute, Thioflavin S in 80% EtOH for 15 minutes, 80% EtOH for 1 minute, 70% EtOH for 1 minute, and then two washes in DI H2O. Coverslips were then mounted on glass slides with Vectashield aqueous mounting media (Vector Labs, Catalog #H1000). Images were captured on a Nikon (Tokyo, Japan) Eclipse Ni upright microscope, using a Nikon Intensilight and Photometrics Coolsnap HQ2 camera to image Thioflavin S. Images were captured with Nikon Elements 4.20.02 image capture software using 4X objective (Nikon Plan Fluor 0.13 N.A. objective).
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10

Melanin Production and Laccase Localization in C. neoformans

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C. neoformans H99 was cultured overnight in YPD at 30 °C, washed twice in sterile PBS, and then diluted to 1 × 106 CFU/ml in sterile PBS. Cells were spotted on defined asparagine minimal media (7.6 mM l-asparagine, 5.6 mM glucose, 22 mM KH2PO4, 1 mM MgSO4-7H20, 0.3 mM thiamine-HCl, and 20 nM biotin) with 0.5 mM L-DOPA (3,4-dihydroxy-l-phenylalanine; Sigma) with DMSO or 8 μg/mL 1. The plates were incubated at 37 °C, and the development of melanin pigment was monitored over 3 days.
For laccase-localization studies, a strain bearing Lac1-GFP was spotted at 37 °C on asparagine minimal media containing 1 mM L-DOPA with DMSO or 2 μg/mL 1. Colonies were picked from each plate and resuspended in sterile water, and then, GFP was imaged with a Nikon epifluorescence microscope with a Cool Snap HQ2 camera and Nikon Elements image acquisition and analysis software. Assays were performed in triplicate at least twice on independent days.
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