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53 protocols using cl 1000

1

Acellular Dermal Matrix UV Crosslinking Protocol

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A 2 cm×3 cm sample of sheet acellular dermal matrix (ADM) derived from porcine dermis and having a wet thickness of approximately 1.3 mm was vacuum dried at 35° C. at less than 100 millitorr absolute pressure for 12-24 hours, yielding a dried, semi-transparent ADM having a thickness of approximately 0.7 mm. The dried, semi-transparent ADM was then transferred to a UVP model CL-1000 ultraviolet crosslinker using UVA lamps emitting a UV wavelength in the range of from 350-375 nm (target 365 nm) and irradiated with 370 nm wavelength UV-A light at an intensity of 5.5 mW/cm2 for 4 hours. The ADM was then rehydrated overnight in Dulbecco's phosphate-buffered saline (PBS buffer) with no Ca or Mg salts (standard nominal concentration of 2.67 mM KCl, 1.47 mM KH2PO4, 138 mM NaCl, and 8.06 mM Na2HPO4.7H2O).

A 2 cm×3 cm sample of “wet” (i.e., not vacuum dried overnight) sheet acellular dermal matrix (ADM) derived from porcine dermis and having a wet thickness of approximately 1.3 mm was placed in a UVP model CL-1000 ultraviolet crosslinker using UVA lamps emitting a UV wavelength in the range of from 350-375 nm (target 365 nm) and irradiated with 370 nm wavelength UV-A light at an intensity of 5.5 mW/cm2 for 4 hours.

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2

Acellular Dermal Matrix UV Crosslinking

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Example 1

A 2 cm×3 cm sample of sheet acellular dermal matrix (ADM) derived from porcine dermis and having a wet thickness of approximately 1.3 mm was vacuum dried at 35° C. at less than 100 millitorr absolute pressure for 12-24 hours, yielding a dried, semi-transparent ADM having a thickness of approximately 0.7 mm. The dried, semi-transparent ADM was then transferred to a UVP model CL-1000 ultraviolet crosslinker using UVA lamps emitting a UV wavelength in the range of from 350-375 nm (target 365 nm) and irradiated with 370 nm wavelength UV-A light at an intensity of 5.5 mW/cm2 for 2 hours. The ADM was then rehydrated overnight in Dulbecco's phosphate-buffered saline (PBS buffer) with no Ca or Mg salts (standard nominal concentration of 2.67 mM KCl, 1.47 mM KH2PO4, 138 mM NaCl, and 8.06 mM Na2HPO4.7H2O).

A 2 cm×3 cm sample of “wet” (i.e., not vacuum dried overnight) sheet acellular dermal matrix (ADM) derived from porcine dermis and having a wet thickness of approximately 1.3 mm was placed in a UVP model CL-1000 ultraviolet crosslinker using UVA lamps emitting a UV wavelength in the range of from 350-375 nm (target 365 nm) and irradiated with 370 nm wavelength UV-A light at an intensity of 5.5 mW/cm2 for 2 hours.

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3

HaCaT UVB Exposure and Treatment

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Before the experiment, 1 × 104 HaCaT cells were plated on each well of a 96-well plate for 24 h. Then, cells were washed with PBS before adding a thin layer of PBS. Cells were then exposed to UVB light (500 mJ/cm2) using CL-1000 (UVP, Analytik Jena, Jena, Germany). Then, cells were maintained in serum-free DMEM with DMSO, EGF, or IPC for 24 h. Control cells were maintained without UVB irradiation.
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4

Northern Blot Analysis of RNA Samples

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Northern blot was performed using NorthernMax kit (ThermoFisher Scientific) and the probes were labeled by α-32P-deoxycytidine 5’-triphosphate (PerkinElmer) using Random Primer DNA Labeling Kit Ver. 2 (Takara, #6045) according to manufacturer’s protocols. Briefly, RNA samples (10 or 20 µg) were resolved in 1 % agarose gel by electrophoresis at 5 V/cm in 1× MOPS buffer for ~ 2 h. Then RNA was transferred onto an Amersham Hybond-N + membrane (GE Healthcare) by capillary blot for 2.5 h using the transfer buffer supplied in NorthernMax kit. Transferred RNA was crosslinked by 254 nm UV at 1200 × 100 µJ/cm2 (Analytik Jena CL-1000). Prehybridization was performed in ULTRAHybe buffer at 50oC for one hour, followed by hybridization with 32P labeled probes overnight at 50oC. The membrane was washed 2 × 5 min at room temperature using Low Stringency Washing Solution and 2 × 15 min at 50oC using High Stringency Washing Solution. The membrane was sealed in kitchen wrap and exposed to a phosphorscreen for several hours to overnight, and the signals were detected by Typhoon FLA7000 (GE Healthcare). Primers used for probe amplification are listed in Table S2.
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5

Monocyte Activation by H7N9-Infected Supernatant

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The culture supernatants of H7N9-infected monocytes with or without treatment were collected at 24 hpi and UV inactivated for 10 min with UVP ultraviolet crosslinker CL-1000 (Analytik Jena, CA, USA). The UV-inactivated supernatants were diluted 1:1 with fresh culture medium. Freshly isolated CD14+ monocytes were incubated with diluted supernatant for 72 h. Cells were then harvested for flow cytometry determination of cell surface expression of CD80, CD83 and CD86.
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6

Organoid Cultivation in Hanging-Drop Plates

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For at least one day prior to organoid seeding, a 384-well hanging-drop (HD) plate custom designed with injection molding (Xcentric) was soaked in 0.1% solution of Pluronic F108 (Sigma-Aldrich, 542342) in distilled water (diH2O) (Gibco, 15230). On the day of organoid seeding, the HD plate was rinsed off with diH2O and then air dried. The plate was then UV-sterilized (Analytik Jena, CL-1000) for 20 minutes on each side. While waiting, the wells of a sterile non-tissue-treated round-bottom 96-well plate (Corning, 351177) were each filled with 150 μl of diH2O supplemented with 1% pen-strep. When the HD plate was fully sterilized, it was placed (sandwiched) between the bottom and the lid of the 96-well plate. The two troughs of the short-edged sides were loaded with diH2O, which were then stuffed with sterile gauze pads. Lastly, the long edges were each added with ~ 1 ml of diH2O.
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7

SARS-CoV-2 Inactivation by UV-C Irradiation

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For inactivation, 50 µL of purified SARS-CoV-2 was exposed to UV-C irradiation at energies ranging from 6.25 to 100 mJ cm−2 using a UVP cross-linker CL-1000 (Analytik Jena, Jena, Germany) at A254 nm. SARS-CoV-2 samples used for cryoEM were inactivated with 100 mJ cm−2. Infectivity reduction was assessed using plaque assays.
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8

Functional Recovery of XPC-Deficient Cells

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To assess the functional recovery of GM14867 cells, which carry a homozygous mutation in the XPC gene, after treatment with xABE, ABEmax, ataluren, or gentamicin, these cells, together with BJ-5ta WT cells, were exposed to ultraviolet irradiation at 254 nm at 1 J/m2/s (cat. no. CL-1000, Analytik Jena) and left to grow for 72 h. Cells treated with ataluren or gentamicin underwent treatment for 48 h before ultraviolet exposure. Cell survival was evaluated with a water-soluble tetrazolium salt assay using an EZ-Cytox kit (cat. no. EZ-1000, DoGEN).
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9

Northern Blot Analysis of Gene Expression

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Northern blot was performed using NorthernMax kit (ThermoFisher Scienti c) and the probes were labeled by α-32 P-deoxycytidine 5'-triphosphate (PerkinElmer) using Random Primer DNA Labeling Kit Ver.
2 (Takara, #6045) according to manufacturer's protocols. Brie y, RNA samples (10 µg or 20 µg) were resolved in 1% agarose gel by electrophoresis at 5 V/cm in 1× MOPS buffer for ~ 2 hours. Then RNA was transferred onto an Amersham Hybond-N + membrane (GE Healthcare) by capillary blot for 2.5 hours using the transfer buffer supplied in NorthernMax kit. Transferred RNA was crosslinked by 254 nm UV at 1200 × 100 µJ/cm 2 (Analytik Jena CL-1000). Prehybridization was performed in ULTRAHybe buffer at 50 o C for one hour, followed by hybridization with 32 P labeled probes overnight at 50 o C. The membrane was washed 2 × 5 min at room temperature using Low Stringency Washing Solution and 2 × 15 min at 50 o C using High Stringency Washing Solution. The membrane was sealed in kitchen wrap and exposed to a phosphorscreen for several hours to overnight, and the signals were detected by Typhoon FLA7000 (GE Healthcare). Quanti cation of bands was performed using ImageQuant software (GE Healthcare). Primers used for probe ampli cation are listed in Table S2.
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10

UVB-Induced Apoptosis Screening

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1 × 104 HaCaT cells were plated with DMEM supplemented with 10% FBS and 1% penicillin-streptomycin on 96-well plate and incubated for 24 hr. Cells were washed with PBS three times and thin layer of PBS was added. Cells were then exposed to UVB light (35 and 50 mJ/cm2) using 312 nm light source of CL-1000 (UVP). After UVB irradiation, cells were cultured in serum free DMEM with or without compounds for 24 hr. Control cells were identically processed but without UVB irradiation.
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